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working init-ctx version

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This commit is contained in:
Olaf Rempel 2008-02-23 00:25:31 +01:00
parent 0302d9bdb0
commit 011d784923
15 changed files with 150 additions and 1633 deletions
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27
include/rtos/context.h Normal file
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@ -0,0 +1,27 @@
#ifndef _CONTEXT_H_
#define _CONTEXT_H_
#include <stdint.h>
#include "rtos/spinlock.h"
enum state_t {
CONTEXT_NULL = 0x00,
CONTEXT_RUNNING,
CONTEXT_READY,
CONTEXT_INTERRUPTED,
CONTEXT_SLEEP,
CONTEXT_SLEEP_QUEUE,
};
struct context {
state_t state;
uint8_t priority;
uint32_t spinlock_held;
uint32_t dummy;
};
uint32_t context_wait_priority_queue(struct spinlock *lock, struct context **queue);
uint32_t context_signal_queue(struct context **queue);
uint32_t context_interrupt_queue(struct context *c, struct context **queue);
#endif /* _CONTEXT_H_ */

10
include/rtos/critical.h Normal file
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@ -0,0 +1,10 @@
#ifndef _CRITICAL_H_
#define _CRITICAL_H_
/* disable Interrupts */
void enter_critical_section(void);
/* enable Interrupts */
void exit_critical_section(void);
#endif /* _CRITICAL_H_ */

22
include/rtos/semaphore.h Normal file
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@ -0,0 +1,22 @@
#ifndef _SEMSPHORE_H_
#define _SEMSPHORE_H_
#include <stdint.h>
#include "rtos/context.h"
#include "rtos/spinlock.h"
struct semaphore {
struct context *sleep_queue;
struct spinlock lock;
uint32_t count;
};
state_t sem_wait(struct semaphore *sem);
void sem_post(struct semaphore *sem);
void sem_interrupt(struct semaphore *sem, struct context *c);
int32_t sem_get_count(struct semaphore *sem);
void sem_init(struct semaphore *sem, uint8_t priority, int32_t count);
#endif /* _SEMSPHORE_H_ */

16
include/rtos/spinlock.h Normal file
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@ -0,0 +1,16 @@
#ifndef _SPINLOCK_H_
#define _SPINLOCK_H_
#include <stdint.h>
struct spinlock {
uint8_t locked;
uint8_t priority_locked;
uint8_t priority_unlocked;
};
void spinlock_lock(struct spinlock *lock);
void spinlock_unlock(struct spinlock *lock);
void spinlock_init(struct spinlock *lock, uint8_t priority);
#endif /* _SPINLOCK_H_ */

118
main.c
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@ -16,46 +16,76 @@
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "board.h"
#include "at91_sysc.h"
#include "at91_dbgu.h"
#include "at91_pitc.h"
#include "at91_tests.h"
#include "at91_udp.h"
#include "at91_pio.h"
#include "at91_twi.h"
#include "at91_tc1.h"
#include "memalloc.h"
#include "board.h"
#include <stdio.h>
#include <string.h>
static uint32_t pitc_test(struct pitc_timer *timer)
uint32_t * init_ctx(uint32_t *stack, void *code, void *arg)
{
static uint32_t i;
*AT91C_PIOA_SODR = i;
i = i ^ LED_GREEN;
*AT91C_PIOA_CODR = i;
/*
struct rc_values rc;
uint32_t count = rcontrol_getvalues(&rc);
uint32_t org_stack = (uint32_t)stack;
printf("%ld channels: ", count);
uint32_t j;
for (j = 0; j < count; j++)
printf("%+5d ", rc.chan[j]);
*stack-- = (uint32_t) code; // r15 (pc)
*stack-- = 0x14141414; // r14 (lr)
*stack-- = org_stack -4; // r13 (sp)
*stack-- = 0x12121212; // r12
*stack-- = 0x11111111; // r11
*stack-- = 0x10101010; // r10
*stack-- = 0x09090909; // r9
*stack-- = 0x08080808; // r8
*stack-- = 0x07070707; // r7
*stack-- = 0x06060606; // r6
*stack-- = 0x05050505; // r5
*stack-- = 0x04040404; // r4
*stack-- = 0x03030303; // r3
*stack-- = 0x02020202; // r2
*stack-- = 0x01010101; // r1
*stack-- = (uint32_t) arg; // r0 (function parameter)
*stack = 0xF0000013; // SPSR (SVC, ARM, IRQ & FIQ enabled)
printf("\r");
*/
return PITC_RESTART_TIMER;
return stack;
}
static struct pitc_timer pitc_test_timer = {
.interval = 10,
.func = &pitc_test,
};
/* we're in the scheduler, SVC mode */
void restore_ctx(uint32_t *stack)
{
asm volatile (
/* restore spsr */
"mov lr, r0 \n\t"
"ldmia lr!, {r0} \n\t"
"msr spsr, r0 \n\t"
/* restore all registers */
"ldmia lr, {r0-r13} \n\t"
"nop \n\t"
"ldmia sp!, {r14-r15}^ \n\t"
"nop \n\t"
);
}
void store_ctx(void)
{
asm volatile (
/* push r0 on (task)stack */
"stmdb sp!, {r0} \n\r"
// TODO: fill r0 with address TCB
/* return address */
"stmdb r0!, {lr} \n\r"
);
}
void testfunc(void *p)
{
printf("bla: %p\n\r", p);
while(1);
}
int main(void)
{
@ -63,33 +93,13 @@ int main(void)
*AT91C_PIOA_PER = LED_GREEN | LED_ORANGE;
*AT91C_PIOA_OER = LED_GREEN | LED_ORANGE;
/* needed for dbgu */
at91_sysc_init();
at91_dbgu_init();
at91_dbgu_puts("==========================================================\n\rGood morning Dave\n\r");
/* triggers pinchange-isrs */
at91_pio_init();
uint32_t *blub = static_alloc(1024);
printf("blub: %p\n\r", blub);
/* timer */
at91_pitc_init();
at91_rttc_test_init();
at91_tc1_init();
/* adc, need timer */
at91_adc_test_init();
/* twi */
at91_twi_init();
at91_twi_test();
/* usb */
at91_udp_init();
printf("static alloc: %5ld bytes\n\r", static_alloc_used());
pitc_schedule_timer(&pitc_test_timer);
while (1);
uint32_t *tmp = init_ctx(blub + (1024/4), testfunc, 0);
restore_ctx(tmp);
}

92
src/at91_adc.c
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@ -1,92 +0,0 @@
/***************************************************************************
* Copyright (C) 01/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "board.h"
#include "at91_pitc.h"
static uint16_t adc_result[4];
static void at91_adc_isr(void)
{
AT91S_PDC *pdc = AT91C_BASE_PDC_ADC;
pdc->PDC_RPR = (uint32_t) &adc_result;
pdc->PDC_RCR = ARRAY_SIZE(adc_result);
pdc->PDC_PTCR = AT91C_PDC_RXTEN;
/* clear interrupts */
AT91S_ADC *adc = AT91C_BASE_ADC;
uint32_t status = adc->ADC_SR;
status = status;
}
static uint32_t adc_trigger(struct pitc_timer *timer)
{
*AT91C_ADC_CR = AT91C_ADC_START;
return PITC_RESTART_TIMER;
}
static struct pitc_timer adc_timer = {
.interval = 100,
.func = &adc_trigger,
};
void at91_adc_test_init(void)
{
/* enable ADC clock */
*AT91C_PMC_PCER = (1 << AT91C_ID_ADC);
/* ADC Software reset */
AT91S_ADC *adc = AT91C_BASE_ADC;
adc->ADC_CR = AT91C_ADC_SWRST;
/*
* ADC config: 10bit, no sleep
* 4.8MHz (48MHz / ((4 +1) * 2) = 4.8MHz)
* 96 cycles Startup ((11 +1) * 8 / 4.8MHz = 20us)
* 3 cycles SH ((2 +1) / 4.8MHz = 625ns)
* Conversion time per channel @5MHz ~2us
*/
adc->ADC_MR = AT91C_ADC_TRGEN_DIS |
AT91C_ADC_LOWRES_10_BIT |
AT91C_ADC_SLEEP_NORMAL_MODE |
(AT91C_ADC_PRESCAL & (4 << 8)) |
(AT91C_ADC_STARTUP & (11 << 16)) |
(AT91C_ADC_SHTIM & (2 << 24));
/* setup PDC */
AT91S_PDC *pdc = AT91C_BASE_PDC_ADC;
pdc->PDC_RPR = (uint32_t) &adc_result;
pdc->PDC_RCR = ARRAY_SIZE(adc_result);
pdc->PDC_PTCR = AT91C_PDC_RXTEN;
/* enable 4 channels, PDC Interrupt */
adc->ADC_CHER = 0xF0;
adc->ADC_IER = AT91C_ADC_ENDRX;
/* low priority, level triggered, own vector */
AT91S_AIC *aic = AT91C_BASE_AIC;
aic->AIC_SMR[AT91C_ID_ADC] = IRQPRIO_ADC | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
aic->AIC_SVR[AT91C_ID_ADC] = (uint32_t)at91_adc_isr;
aic->AIC_IECR = (1<<AT91C_ID_ADC);
pitc_schedule_timer(&adc_timer);
}

8
src/at91_exceptions.c
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@ -59,8 +59,8 @@ ARM7TDMI 32bit Undefined Address Instruction Fetch Abort
--- Registerdump (cpsr:0xa0000013 - SVC):
r0:0x00000002 r1:0x0000000c r2:0x00200038 r3:0x80000000
r4:0x0020fffc r5:0x00101788 r6:0x00000180 r7:0x41000000
r8:0x00008400 r9:0x00100004 r10:0x03000294 fp:0x0020fe84
r12:0x0020fe10 sp:0x0020fe70 lr:0x00102174 pc:0x80000004
r8:0x00008400 r9:0x00100004 sl:0x03000294 fp:0x0020fe84
ip:0x0020fe10 sp:0x0020fe70 lr:0x00102174 pc:0x80000004
--- Stackdump:
0x0020fe70: 0x0020fe7c 0x00101648 0x001015a8 0x0020feaf
0x0020fe80: 0x0020fec0 0x0020fe90 0x00101780 0x00101620
@ -142,9 +142,9 @@ void at91_abt_handler(uint32_t cpsr, uint32_t *registers)
dbgu_hexvar(" r7:", registers[10]);
dbgu_hexvar("\n r8:", registers[11]);
dbgu_hexvar(" r9:", registers[12]);
dbgu_hexvar(" r10:", registers[13]);
dbgu_hexvar(" sl:", registers[13]);
dbgu_hexvar(" fp:", registers[14]);
dbgu_hexvar("\nr12:", registers[15]);
dbgu_hexvar("\n ip:", registers[15]);
dbgu_hexvar(" sp:", registers[0]);
dbgu_hexvar(" lr:", registers[1]);
dbgu_hexvar(" pc:", registers[2]);

69
src/at91_pio.c
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@ -1,69 +0,0 @@
/***************************************************************************
* Copyright (C) 01/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "board.h"
#include "at91_pio.h"
/* extern symbols, defined in ldscript */
extern struct pio_pinchange_isr _pio_isr_table;
extern struct pio_pinchange_isr _pio_isr_table_end;
static void pio_isr(void)
{
uint32_t status = *AT91C_PIOA_ISR;
uint32_t input = *AT91C_PIOA_PDSR;
struct pio_pinchange_isr *isr;
for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
if (isr->mask & status)
isr->func(status, input);
}
void pio_trigger_isr(uint32_t mask)
{
uint32_t input = *AT91C_PIOA_PDSR;
struct pio_pinchange_isr *isr;
for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
if (isr->mask & mask)
isr->func(mask, input);
}
void at91_pio_init(void)
{
/* enable PIO clock */
*AT91C_PMC_PCER = (1 << AT91C_ID_PIOA);
/* enable pinchange interrupts */
struct pio_pinchange_isr *isr;
for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
*AT91C_PIOA_IER = isr->mask;
/* dummy read to clear interrupts */
uint32_t dummy = *AT91C_PIOA_ISR;
dummy = dummy;
/* low priority, level triggered, own vector */
AT91S_AIC *aic = AT91C_BASE_AIC;
aic->AIC_SMR[AT91C_ID_PIOA] = IRQPRIO_PIOA | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
aic->AIC_SVR[AT91C_ID_PIOA] = (uint32_t)pio_isr;
aic->AIC_IECR = (1 << AT91C_ID_PIOA);
}

79
src/at91_pitc.c
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@ -1,79 +0,0 @@
/***************************************************************************
* Copyright (C) 01/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "AT91SAM7S256.h"
#include "at91_pitc.h"
#include "at91_sysc.h"
#include "board.h"
/* PIV is 20bit -> min. 3Hz @48MHz MCK */
#define HZ_TO_PIV(HZ) (MCK / (16 * HZ))
static LIST_HEAD(timer_list);
volatile static uint32_t pitc_ticks;
void pitc_schedule_timer(struct pitc_timer *timer)
{
timer->nextrun = timer->interval + pitc_ticks;
struct pitc_timer *search;
list_for_each_entry(search, &timer_list, list)
if (search->nextrun > timer->nextrun)
break;
list_add_tail(&timer->list, &search->list);
}
static void pitc_isr(uint32_t status)
{
/* get Ticks and clear interrupt */
pitc_ticks += (*AT91C_PITC_PIVR & AT91C_PITC_PICNT) >> 20;
struct pitc_timer *search, *tmp;
list_for_each_entry_safe(search, tmp, &timer_list, list) {
/* if this entry not scheduled yet, abort search */
if (pitc_ticks < search->nextrun)
break;
/* remove from list */
list_del(&search->list);
/* exec handler */
if (search->func(search) == PITC_REMOVE_TIMER) {
/* one-shot timer, mark as completed */
search->nextrun = 0x00;
continue;
}
/* interval timer, reschedule it */
pitc_schedule_timer(search);
}
}
uint32_t pitc_get_ticks(void)
{
return pitc_ticks;
}
void at91_pitc_init(void)
{
sysc_register_isr(AT91_SYSIRQ_PIT, &pitc_isr);
*AT91C_PITC_PIMR = (AT91C_PITC_PIV & HZ_TO_PIV(100)) |
AT91C_PITC_PITEN |
AT91C_PITC_PITIEN;
}

34
src/at91_rttc_test.c
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@ -1,34 +0,0 @@
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "at91_sysc.h"
#include "board.h"
static void rtt_isr(uint32_t status)
{
*AT91C_RTTC_RTAR = *AT91C_RTTC_RTVR +1;
/*
static uint32_t i;
*AT91C_PIOA_SODR = i;
i = i ^ LED_ORANGE;
*AT91C_PIOA_CODR = i;
*/
}
void at91_rttc_test_init(void)
{
/* calculate SLOWCK from MAINCK and measured MAINF */
uint32_t prescaler = MAINCK * 16 / (*AT91C_CKGR_MCFR & AT91C_CKGR_MAINF);
sysc_register_isr(AT91_SYSIRQ_RTT, &rtt_isr);
/*
* AT91C_RTTC_RTTINCIEN doesn't work
* use AT91C_RTTC_ALMIEN and increment RTAR in isr
*/
*AT91C_RTTC_RTAR = *AT91C_RTTC_RTVR +1;
*AT91C_RTTC_RTMR = (AT91C_RTTC_RTPRES & prescaler) |
AT91C_RTTC_ALMIEN |
AT91C_RTTC_RTTRST;
printf("rttc running at %ld Hz\n\r", prescaler);
}

227
src/at91_tc1.c
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@ -1,227 +0,0 @@
/***************************************************************************
* Copyright (C) 01/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h> /* abs() */
#include "AT91SAM7S256.h"
#include "board.h"
#include "at91_tc1.h"
#include "at91_pio.h"
/* Hard limits for ISR */
#define PULSE_MIN 0x0500
#define PULSE_MAX 0x0D00
#define PULSE_TIMEOUT 0x0F00
#define PULSE_CENTER 0x08C0
/* moving average filters */
#define PULSE_FILTER_FAST (1<<2)
#define PULSE_FILTER_SLOW (1<<4)
#define PULSE_FILTER_DIFF 16 /* point to switch filters */
#define PULSE_MID_DIFF 50 /* minimum diff to center */
#define VALUE_RANGE 256
#define ROUND_DIV256(x) ((x >> 8) + ((x & 0x80) ? 1 : 0))
struct channel_data {
uint16_t width;
uint16_t width_slow;
uint16_t filter; /* 0 - fast filter, 1 - slow filter */
uint16_t min; /* minimum value during calibration */
uint16_t mid; /* center value */
uint16_t max; /* maximum value */
};
static struct channel_data ch_data[MAX_CHANNELS];
static uint32_t count, valid, cal_in_progress;
static void ppm_isr(void)
{
static uint32_t i;
/* RC Compare -> no TIOA1 edge for 2.5ms */
uint32_t status = *AT91C_TC1_SR;
if (status & AT91C_TC_CPCS) {
/* average channel count */
count = ((count * 7) + (i << 8)) / 8;
/* at least 4 channels and a stable channel count */
if ((ROUND_DIV256(count) == i) && (i >= 4)) {
if (valid < 10)
valid++;
} else if (valid > 0) {
valid--;
}
/* reset index */
i = 0;
}
/* edge on TIOA1 */
if (status & AT91C_TC_LDRAS) {
/* get impulse width */
uint16_t width = *AT91C_TC1_RA;
/* valid range: 1 - 2ms */
if (width > PULSE_MIN && width < PULSE_MAX) {
if (i < ARRAY_SIZE(ch_data)) {
/* calc both filters */
ch_data[i].width = ((ch_data[i].width * (PULSE_FILTER_FAST -1)) + width) / PULSE_FILTER_FAST;
ch_data[i].width_slow = ((ch_data[i].width_slow * (PULSE_FILTER_SLOW -1)) + width) / PULSE_FILTER_SLOW;
if (cal_in_progress) {
/* use slow filter values, calc center */
ch_data[i].min = MIN(ch_data[i].width_slow, ch_data[i].min);
ch_data[i].max = MAX(ch_data[i].width_slow, ch_data[i].max);
ch_data[i].mid = (ch_data[i].min + ch_data[i].max) / 2;
}
}
i++;
}
}
}
uint32_t rcontrol_getvalues(struct rc_values *rc)
{
if (valid < 5)
return 0;
uint32_t i;
uint32_t cnt = MIN(ROUND_DIV256(count), ARRAY_SIZE(ch_data));
for (i = 0; i < cnt; i++) {
/* switch between fast and slow filter */
uint16_t filter = (abs(ch_data[i].width - ch_data[i].width_slow) < PULSE_FILTER_DIFF);
/*
* transition fast -> slow filter
* slow filter is lagging behind, so give it a boost
*/
if (filter && !ch_data[i].filter && !cal_in_progress)
ch_data[i].width_slow = ch_data[i].width;
ch_data[i].filter = filter;
uint16_t width = (filter) ? ch_data[i].width_slow : ch_data[i].width;
/* expand the value to +/- VALUE_RANGE */
int32_t tmp = (width - ch_data[i].mid) * VALUE_RANGE;
tmp = tmp / ((tmp > 0) ? (ch_data[i].max - ch_data[i].mid) : (ch_data[i].mid - ch_data[i].min));
/* keep result in range */
if (tmp > VALUE_RANGE)
tmp = VALUE_RANGE;
if (tmp < -VALUE_RANGE)
tmp = -VALUE_RANGE;
rc->chan[i] = tmp;
}
return cnt;
}
void rcontrol_calibrate(uint32_t mode)
{
uint32_t i;
switch (mode) {
case RC_CAL_START:
cal_in_progress = 1;
for (i = 0; i < ARRAY_SIZE(ch_data); i++) {
/* use hard limits as hint */
ch_data[i].max = PULSE_MIN;
ch_data[i].mid = (PULSE_MIN + PULSE_MAX) / 2;
ch_data[i].min = PULSE_MAX;
}
break;
case RC_CAL_END:
cal_in_progress = 0;
for (i = 0; i < ARRAY_SIZE(ch_data); i++) {
/* treat current position as center */
ch_data[i].mid = ch_data[i].width_slow;
/* if center is near minimum, clamp output to 0..+1024 */
if (ch_data[i].mid - ch_data[i].min < PULSE_MID_DIFF)
ch_data[i].mid = ch_data[i].min;
/* if center is near maximum, clamp output to -1024..0 */
if (ch_data[i].max - ch_data[i].mid < PULSE_MID_DIFF)
ch_data[i].mid = ch_data[i].max;
}
break;
}
}
void rcontrol_print_cal(void)
{
uint32_t i;
for (i = 0; i < ARRAY_SIZE(ch_data); i++) {
printf("%ld: %d(%+d) - %d(0) - %d(%+d)\n\r", i,
ch_data[i].min, ch_data[i].min - ch_data[i].mid,
ch_data[i].mid,
ch_data[i].max, ch_data[i].max - ch_data[i].mid
);
}
}
void at91_tc1_init(void)
{
/* enable TC1 clock */
*AT91C_PMC_PCER = (1 << AT91C_ID_TC1);
/* MCK /32, trigger & capture on falling TIOA1 edge */
*AT91C_TC1_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | AT91C_TC_LDRA_FALLING |
AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG;
/* enable RA load and RC compare interrupt */
*AT91C_TC1_IER = AT91C_TC_LDRAS | AT91C_TC_CPCS;
/* RC Compare Interrupt if no rising Edge on TIOA1 for 2.56ms */
*AT91C_TC1_RC = PULSE_TIMEOUT;
/* enable & trigger the clock */
*AT91C_TC1_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
/* level triggered, own vector */
AT91S_AIC *aic = AT91C_BASE_AIC;
aic->AIC_SMR[AT91C_ID_TC1] = IRQPRIO_TC1 | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
aic->AIC_SVR[AT91C_ID_TC1] = (uint32_t)ppm_isr;
aic->AIC_IECR = (1 << AT91C_ID_TC1);
}
static void tast_monitor(uint32_t status, uint32_t input)
{
if (!(input & TAST1) && (cal_in_progress == 0)) {
printf("start calibration\n\r");
rcontrol_calibrate(RC_CAL_START);
} else if (!(input & TAST2) && (cal_in_progress == 1)) {
printf("end calibration\n\r");
rcontrol_calibrate(RC_CAL_END);
rcontrol_print_cal();
}
}
PIO_PINCHANGE_ISR(TAST1 | TAST2, tast_monitor);

261
src/at91_twi.c
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@ -1,261 +0,0 @@
/***************************************************************************
* Copyright (C) 02/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "board.h"
#include "at91_twi.h"
#include "at91_pio.h"
/*
* undocumented TWI_SR flags, at least OVRE seems to be present on a sam7s256
* taken from linux-2.6.24/include/asm-arm/arch-at91/at91_twi.h
*/
#define AT91_TWI_OVRE (1<<6) /* Overrun */
#define AT91_TWI_UNRE (1<<7) /* Underrun */
/*
* while ((cldiv = ((MCK / (2 * TWI)) -3) / (1 << ckdiv)) > 255)
* ckdiv++ ;
*
* works for TWI >= 100kHz
*/
#define TWI_CLK(x) (((MCK / (2 * (x))) -3)<<8 | ((MCK / (2 * (x))) -3))
enum twi_states {
TWI_IDLE = 0x00,
TWI_ERROR,
TWI_GENERIC_CMD = 0x10,
TWI_BLMC_UPDATE = 0x20,
};
static volatile uint32_t twi_state = TWI_IDLE;
static uint8_t *twi_data;
static uint32_t twi_size;
static uint32_t twi_count;
static void twi_isr(void)
{
/* get status */
uint32_t status = *AT91C_TWI_SR;
status &= *AT91C_TWI_IMR;
/* NACK - disable all interrupts and go to state TWI_ERROR */
if (status & AT91C_TWI_NACK) {
*AT91C_TWI_IDR = AT91C_TWI_TXCOMP | AT91C_TWI_RXRDY | AT91C_TWI_TXRDY | AT91C_TWI_NACK;
twi_state = TWI_ERROR;
// TODO: TWI_BLMC_UPDATE?
return;
}
/* tx register ready for new data */
if (status & AT91C_TWI_TXRDY) {
if (twi_count != twi_size) {
/* feed next byte */
*AT91C_TWI_THR = twi_data[twi_count++];
} else {
/* wait for TXCOMP */
*AT91C_TWI_IDR = AT91C_TWI_RXRDY | AT91C_TWI_TXRDY;
*AT91C_TWI_IER = AT91C_TWI_TXCOMP | AT91C_TWI_NACK;
}
}
/* rx register has data */
if (status & AT91C_TWI_RXRDY) {
/* get data */
twi_data[twi_count++] = *AT91C_TWI_RHR;
/* transfer complete? */
if (twi_count == twi_size) {
/* send STOP and wait for TXCOMP */
*AT91C_TWI_CR = AT91C_TWI_STOP;
*AT91C_TWI_IDR = AT91C_TWI_TXRDY;
*AT91C_TWI_IER = AT91C_TWI_TXCOMP | AT91C_TWI_NACK;
}
}
/* transfer really complete? */
if (status & AT91C_TWI_TXCOMP) {
/* are we doing a blmc update? */
if (twi_state == TWI_BLMC_UPDATE) {
uint32_t addr = (*AT91C_TWI_MMR >> 16) & 0x7F;
if (addr != TWI_ADDR_BL4) {
/* increase address */
*AT91C_TWI_MMR += (1<<16);
/* send next value to next blmc */
*AT91C_TWI_THR = *twi_data++;
} else {
// TODO:
}
} else {
*AT91C_TWI_IDR = AT91C_TWI_TXCOMP | AT91C_TWI_RXRDY | AT91C_TWI_TXRDY | AT91C_TWI_NACK;
twi_state = TWI_IDLE;
}
}
}
uint32_t twi_setpwm(uint8_t *values)
{
if (twi_state != TWI_IDLE)
return 1;
twi_state = TWI_BLMC_UPDATE;
twi_data = values; /* data is not copied! */
twi_size = 0;
twi_count = 0;
*AT91C_TWI_MMR = (TWI_ADDR_BL1 << 16) | AT91C_TWI_IADRSZ_1_BYTE;
*AT91C_TWI_IADR = CMD_SET_PWM;
*AT91C_TWI_THR = *twi_data++;
*AT91C_TWI_IER = AT91C_TWI_TXRDY | AT91C_TWI_NACK;
return 0;
}
uint32_t twi_cmd(uint8_t addr, struct blmc_cmd *cmd)
{
if (twi_state != TWI_IDLE)
return 1;
/* TODO: locking needed? */
twi_state = TWI_GENERIC_CMD;
/* read transfer, or write transfer with payload */
if (cmd->mode & BLMC_CMD_READ || cmd->size != 0) {
/* set address, direction, argument count and command bytes */
*AT91C_TWI_MMR = (addr << 16) | (cmd->mode & 0xFF) << 8;
*AT91C_TWI_IADR = cmd->cmd;
/* write transfer without payload */
} else {
/* use one cmd byte as payload (needed to start transfer) */
cmd->mode--;
*AT91C_TWI_MMR = (addr << 16) | (cmd->mode & 0xFF) << 8;
*AT91C_TWI_IADR = (cmd->cmd) >> 8;
}
/* isr needs data & size parameters */
twi_data = cmd->data;
twi_size = cmd->size;
twi_count = 0;
if (cmd->mode & BLMC_CMD_READ) {
*AT91C_TWI_CR = AT91C_TWI_START;
*AT91C_TWI_IER = AT91C_TWI_RXRDY | AT91C_TWI_NACK;
} else {
*AT91C_TWI_THR = (twi_size != 0) ? cmd->data[twi_count++] : (cmd->cmd & 0xFF);
*AT91C_TWI_IER = AT91C_TWI_TXRDY | AT91C_TWI_NACK;
}
/*
* wait for end
* TODO: locking needed?
* TODO: timeout?
*/
while (twi_state != TWI_IDLE && twi_state != TWI_ERROR);
if (twi_state != TWI_IDLE) {
twi_state = TWI_IDLE;
return 1;
}
return 0;
}
void at91_twi_test(void)
{
uint32_t i;
for (i = TWI_ADDR_BL1; i <= TWI_ADDR_BL4; i++) {
struct blmc_cmd cmd = {
.cmd = CMD_BOOT_LOADER,
.mode = BLMC_CMD_WRITE | BLMC_CMD_0_ARG,
};
uint32_t ret = twi_cmd(i, &cmd);
printf("twi[0x%02lx](%ld) ", i, ret);
volatile uint32_t x;
for (x = 0; x < 200000; x++);
uint8_t buf[16];
cmd.cmd = CMD_GET_INFO,
cmd.mode = BLMC_CMD_READ | BLMC_CMD_0_ARG,
cmd.size = sizeof(buf),
cmd.data = buf,
ret = twi_cmd(i, &cmd);
printf("boot(%ld):'%s' ", ret, buf);
cmd.cmd = CMD_GET_SIGNATURE;
cmd.size = 4;
ret = twi_cmd(i, &cmd);
printf("sig(%ld):0x%02x%02x%02x ", ret, buf[0], buf[1], buf[2]);
cmd.cmd = CMD_BOOT_APPLICATION;
cmd.mode = BLMC_CMD_WRITE | BLMC_CMD_0_ARG;
cmd.size = 0;
ret = twi_cmd(i, &cmd);
for (x = 0; x < 200000; x++);
cmd.cmd = CMD_GET_INFO,
cmd.mode = BLMC_CMD_READ | BLMC_CMD_0_ARG,
cmd.size = sizeof(buf),
cmd.data = buf,
ret = twi_cmd(i, &cmd);
printf("app(%ld):'%s'\n\r", ret, buf);
}
}
void at91_twi_init(void)
{
/* enable Clock */
*AT91C_PMC_PCER = (1 << AT91C_ID_TWI);
/* SDA & SCL from Peripheral A, Open Drain, no Pullup */
AT91S_PIO *pio = AT91C_BASE_PIOA;
/* do a software reset (bus not connected) */
*AT91C_TWI_CR = AT91C_TWI_SWRST;
pio->PIO_MDER = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_PPUDR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_ASR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_PDR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
/* set TWI Clock */
*AT91C_TWI_CWGR = TWI_CLK(400000); //| (5<<16);
/* disable all (known) interrupts */
*AT91C_TWI_IDR = AT91C_TWI_TXCOMP | AT91C_TWI_RXRDY | AT91C_TWI_TXRDY | AT91C_TWI_NACK;
/* level triggered, own vector */
AT91S_AIC *aic = AT91C_BASE_AIC;
aic->AIC_SMR[AT91C_ID_TWI] = IRQPRIO_TWI | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
aic->AIC_SVR[AT91C_ID_TWI] = (uint32_t)twi_isr;
aic->AIC_IECR = (1 << AT91C_ID_TWI);
/* enable teh monster */
*AT91C_TWI_CR = AT91C_TWI_MSEN;
}

552
src/at91_udp.c
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@ -1,552 +0,0 @@
/***************************************************************************
* Copyright (C) 01/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "at91_pio.h"
#include "board.h"
#include "fifo.h"
#include "usb_ch9.h"
#include "usb_cdc.h"
#define csr_clear_flags(csr, flags) \
while ((csr) & (flags)) \
(csr) &= ~(flags);
#define csr_set_flags(csr, flags) \
while (((csr) & (flags)) != (flags)) \
(csr) |= (flags);
struct ep_transfer {
uint16_t length;
uint16_t curpos;
char *data;
void (*complete_cb)(void);
};
struct ep_ctx {
uint16_t maxpktsize;
uint16_t flags;
union {
struct ep_transfer *transfer;
struct fifo *fifo;
};
};
#define CTX_TRANSFER 0x01 /* ctx use ep_transfer struct */
#define CTX_FIFO 0x02 /* ctx use fifo */
#define CTX_IN 0x04 /* write to the host */
#define CTX_OUT 0x08 /* read from the host */
#define CTX_RXBANK0 0x10
#define CTX_RXBANK1 0x20
static struct ep_transfer ep0_transfer;
static struct ep_ctx ep_ctx[4];
static uint16_t current_address;
static uint16_t current_config;
static uint16_t current_interface;
static const struct usb_device_descriptor dev_descriptor = {
.bLength = sizeof(struct usb_device_descriptor),
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = 0x0110,
.bMaxPacketSize0 = 8,
.idVendor = USB_VENDOR_ID,
.idProduct = USB_PRODUCT_ID +1,
.bcdDevice = 0x0001,
.bNumConfigurations = 1,
};
struct my_config {
struct usb_config_descriptor cfg;
struct usb_interface_descriptor ctrl_iface;
struct usb_cdc_header_desc cdc_header;
struct usb_cdc_call_mgmt_descriptor cdc_call_mgmt;
struct usb_cdc_acm_descriptor cdc_acm;
struct usb_cdc_union_desc cdc_union;
struct usb_endpoint_descriptor notify_ep;
struct usb_interface_descriptor data_iface;
struct usb_endpoint_descriptor dataout_ep;
struct usb_endpoint_descriptor datain_ep;
} __attribute__ ((packed));
static const struct my_config cfg_descriptor = {
.cfg = {
.bLength = sizeof(struct usb_config_descriptor),
.bDescriptorType = USB_DT_CONFIG,
.wTotalLength = sizeof(struct my_config),
.bNumInterfaces = 2,
.bConfigurationValue = 1,
.bmAttributes = USB_CONFIG_ATT_SELFPOWER | USB_CONFIG_ATT_WAKEUP,
.bMaxPower = 50,
},
.ctrl_iface = {
.bLength = sizeof(struct usb_interface_descriptor),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = 1,
},
.cdc_header = {
.bLength = sizeof(struct usb_cdc_header_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = 0x0110,
},
.cdc_call_mgmt = {
.bLength = sizeof(struct usb_cdc_call_mgmt_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
.bmCapabilities = USB_CDC_CALL_MGMT_CAP_CALL_MGMT,
.bDataInterface = 1,
},
.cdc_acm = {
.bLength = sizeof(struct usb_cdc_acm_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ACM_TYPE,
.bmCapabilities = (USB_CDC_CAP_BRK | USB_CDC_CAP_LINE | USB_CDC_COMM_FEATURE),
},
.cdc_union = {
.bLength = sizeof(struct usb_cdc_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
.bMasterInterface0 = 0,
.bSlaveInterface0 = 1,
},
.notify_ep = {
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN | 0x03,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = 64,
.bInterval = 10,
},
.data_iface = {
.bLength = sizeof(struct usb_interface_descriptor),
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
},
.dataout_ep = {
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},
.datain_ep = {
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN | 0x02,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},
};
static void ep_transfer_send(uint32_t ep, char *data, uint32_t length,
void (*complete_cb)(void))
{
struct ep_ctx *ctx = &ep_ctx[ep];
// printf("ep_transfer_send(%ld) size=%ld flags=0x%x\n\r", ep, length, ctx->flags);
if (!(ctx->flags & CTX_TRANSFER) || (ctx->flags & (CTX_IN | CTX_OUT)))
return;
/* from buffer to usb */
ctx->flags |= CTX_IN;
struct ep_transfer *transfer = ctx->transfer;
transfer->length = length;
transfer->curpos = 0;
transfer->data = data;
transfer->complete_cb = complete_cb;
uint32_t maxsize = ctx->maxpktsize;
/* get data from transfer */
while (transfer->curpos < transfer->length && maxsize--)
AT91C_UDP_FDR[ep] = transfer->data[transfer->curpos++];
/* trigger tx */
AT91C_UDP_CSR[ep] |= AT91C_UDP_TXPKTRDY;
}
static void ep_transfer_receive(uint32_t ep, char *data, uint32_t length,
void (*complete_cb)(void))
{
struct ep_ctx *ctx = &ep_ctx[ep];
// printf("ep_transfer_receive(%ld) size=%ld flags=0x%x\n\r", ep, length, ctx->flags);
if (!(ctx->flags & CTX_TRANSFER) || (ctx->flags & (CTX_IN | CTX_OUT)))
return;
/* from usb to buffer */
ctx->flags |= CTX_OUT;
struct ep_transfer *transfer = ctx->transfer;
transfer->length = length;
transfer->curpos = 0;
transfer->data = data;
transfer->complete_cb = complete_cb;
}
/* stalls the endpoint */
static void ep_send_stall(uint32_t ep)
{
printf("stall\n\r");
AT91C_UDP_CSR[ep] |= AT91C_UDP_FORCESTALL;
}
static void udp_configure_ep(const struct usb_endpoint_descriptor *desc)
{
/* get endpoint address, set Max Packet Size */
uint32_t ep = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
ep_ctx[ep].maxpktsize = desc->wMaxPacketSize;
/* get endpoint type (ctrl, iso, bulb, int) */
uint32_t eptype = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
if (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) {
eptype |= 0x04;
} else {
ep_ctx[ep].flags |= CTX_RXBANK0;
}
/* configure UDP endpoint and enable interrupt */
AT91C_UDP_CSR[ep] = AT91C_UDP_EPEDS | (eptype << 8);
*AT91C_UDP_IER = (1 << ep);
}
/*
* set local address
* (USB_REQ_SET_ADDRESS callback)
*/
static void udp_txcb_setaddress(void)
{
*AT91C_UDP_FADDR = (AT91C_UDP_FEN | current_address);
*AT91C_UDP_GLBSTATE = AT91C_UDP_FADDEN;
}
/*
* configure endpoints
* (USB_REQ_SET_CONFIGURATION callback)
*/
static void udp_txcb_setconfig(void)
{
udp_configure_ep(&cfg_descriptor.notify_ep);
udp_configure_ep(&cfg_descriptor.datain_ep);
udp_configure_ep(&cfg_descriptor.dataout_ep);
/* set UDP to "configured" */
*AT91C_UDP_GLBSTATE = AT91C_UDP_CONFG;
}
static void udp_txcb_setinterface(void)
{
printf("claim interface %d\n\r", current_interface);
}
static void ep_handle_ctrlrequest(struct usb_ctrlrequest *req)
{
printf("typ:0x%02x req:0x%02x val:0x%04x idx:0x%04x len:0x%04x\n\r",
req->bRequestType, req->bRequest, req->wValue, req->wIndex, req->wLength);
switch (req->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) {
case (USB_TYPE_STANDARD | USB_RECIP_DEVICE): /* 0x00/0x80 */
switch (req->bRequest) {
case USB_REQ_SET_ADDRESS: /* 0x05 */
current_address = req->wValue;
ep_transfer_send(0, NULL, 0, udp_txcb_setaddress);
break;
case USB_REQ_GET_DESCRIPTOR: /* 0x06 */
switch (req->wValue >> 8) {
case USB_DT_DEVICE: /* 0x01 */
ep_transfer_send(0, (char *)&dev_descriptor,
MIN(sizeof(dev_descriptor), req->wLength),
NULL);
break;
case USB_DT_CONFIG: /* 0x02 */
ep_transfer_send(0, (char *)&cfg_descriptor,
MIN(sizeof(cfg_descriptor), req->wLength),
NULL);
break;
default:
ep_send_stall(0);
break;
}
break;
case USB_REQ_SET_CONFIGURATION: /* 0x09 */
current_config = req->wValue;
ep_transfer_send(0, NULL, 0, udp_txcb_setconfig);
break;
default:
ep_send_stall(0);
break;
}
break;
case (USB_TYPE_STANDARD | USB_RECIP_INTERFACE): /* 0x01/0x81 */
// TODO: follow current_interface
switch (req->bRequest) {
case USB_REQ_SET_INTERFACE: /* 0x0b */
current_interface = req->wValue;
ep_transfer_send(0, NULL, 0, udp_txcb_setinterface);
break;
default:
ep_send_stall(0);
break;
}
break;
case (USB_TYPE_CLASS | USB_RECIP_INTERFACE): /* 0x21/0xA1 */
// TODO: follow current_interface
switch (req->bRequest) {
case USB_CDC_REQ_SET_LINE_CODING: /* 0x20 */
/* read 7 bytes */
break;
case USB_CDC_REQ_SET_CONTROL_LINE_STATE: /* 0x22 */
ep_transfer_send(0, NULL, 0, NULL);
break;
default:
ep_send_stall(0);
break;
}
break;
default:
ep_send_stall(0);
break;
}
}
static void udp_handle_ep(uint32_t ep)
{
/* endpoint enabled? */
AT91_REG *csr = &AT91C_UDP_CSR[ep];
if (!(*csr & AT91C_UDP_EPEDS))
return;
/* ctrl request packet? */
if (*csr & AT91C_UDP_RXSETUP) {
struct usb_ctrlrequest req;
uint8_t *p;
for (p = (uint8_t *)&req; p < (uint8_t *)(&req +1); p++)
*p = AT91C_UDP_FDR[ep];
/* set data phase transfer direction */
if (req.bRequestType & USB_DIR_IN)
*csr |= AT91C_UDP_DIR;
/* clear interrupt - *MUST* use csr_clear_flags() here */
csr_clear_flags(*csr, AT91C_UDP_RXSETUP);
ep_handle_ctrlrequest(&req);
}
/* transmit complete? */
if (*csr & AT91C_UDP_TXCOMP) {
struct ep_ctx *ctx = &ep_ctx[ep];
if (ctx->flags & CTX_FIFO) {
/* get data from fifo */
if (fifo_txudp(ctx->fifo, ep, ctx->maxpktsize))
AT91C_UDP_CSR[ep] |= AT91C_UDP_TXPKTRDY;
} else if ((ctx->flags & (CTX_TRANSFER | CTX_IN)) == (CTX_TRANSFER | CTX_IN)) {
/* transfer not complete */
struct ep_transfer *transfer = ctx->transfer;
if (transfer->length != transfer->curpos) {
uint32_t maxsize = ctx->maxpktsize;
/* get data from transfer */
while (transfer->curpos < transfer->length && maxsize--)
AT91C_UDP_FDR[ep] = transfer->data[transfer->curpos++];
/* trigger tx */
AT91C_UDP_CSR[ep] |= AT91C_UDP_TXPKTRDY;
/* transfer complete, execute callback */
} else {
ctx->flags &= ~CTX_IN;
if (transfer->complete_cb)
transfer->complete_cb();
}
}
/* clear interrupt */
*csr &= ~(AT91C_UDP_TXCOMP);
}
/* clear STALLSENT interrupt */
if (*csr & AT91C_UDP_STALLSENT)
csr_clear_flags(*csr, (AT91C_UDP_STALLSENT | AT91C_UDP_FORCESTALL));
/* data ready to read? */
if (*csr & (AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1)) {
struct ep_ctx *ctx = &ep_ctx[ep];
uint16_t len = (*csr & AT91C_UDP_RXBYTECNT) >> 16;
// TODO: only ep0 status OUT?
if (!len && (ctx->flags & CTX_TRANSFER)) {
ctx->flags &= ~(CTX_OUT | CTX_IN);
ctx->transfer->length = 0;
ctx->transfer->curpos = 0;
}
if (ctx->flags & CTX_FIFO) {
fifo_rxudp(ctx->fifo, ep, len);
} else if ((ctx->flags & (CTX_TRANSFER | CTX_OUT)) == (CTX_TRANSFER | CTX_OUT)) {
/* transfer not complete */
struct ep_transfer *transfer = ctx->transfer;
if (transfer->length != transfer->curpos) {
/* get data from transfer */
while (transfer->curpos < transfer->length && len--)
transfer->data[transfer->curpos++] = AT91C_UDP_FDR[ep];
}
/* test again */
if (transfer->length == transfer->curpos) {
ctx->flags &= ~CTX_OUT;
if (transfer->complete_cb)
transfer->complete_cb();
}
}
if (ctx->flags & CTX_RXBANK0) {
if (*csr & AT91C_UDP_RX_DATA_BK0)
csr_clear_flags(*csr, AT91C_UDP_RX_DATA_BK0);
/* all but ep0 have ping pong buffers */
if (ep > 0)
ctx->flags = (ctx->flags & ~CTX_RXBANK0) | CTX_RXBANK1;
} else if (ctx->flags & CTX_RXBANK1) {
if (*csr & AT91C_UDP_RX_DATA_BK1)
csr_clear_flags(*csr, AT91C_UDP_RX_DATA_BK1);
ctx->flags = (ctx->flags & ~CTX_RXBANK1) | CTX_RXBANK0;
}
}
}
static void udp_isr(void)
{
uint32_t isr = *AT91C_UDP_ISR;
if (isr & AT91C_UDP_ENDBUSRES) {
AT91S_UDP *udp = AT91C_BASE_UDP;
/* reset all endpoints */
udp->UDP_RSTEP = (AT91C_UDP_EP0 | AT91C_UDP_EP1 |
AT91C_UDP_EP2 | AT91C_UDP_EP3) ;
udp->UDP_RSTEP = 0;
/* init ep0 */
struct ep_ctx *ctx = &ep_ctx[0];
ctx->maxpktsize = 8;
ctx->flags = CTX_TRANSFER | CTX_RXBANK0;
ctx->transfer = &ep0_transfer;
ctx->transfer->length = 0;
ctx->transfer->curpos = 0;
/* Configure endpoint0 as Control EP */
udp->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
/* enable ep0 Interrupt, disable all others */
udp->UDP_IER = AT91C_UDP_EPINT0;
udp->UDP_IDR = AT91C_UDP_EPINT1 | AT91C_UDP_EPINT2 | AT91C_UDP_EPINT3 |
AT91C_UDP_RXSUSP | AT91C_UDP_RXRSM | AT91C_UDP_SOFINT |
AT91C_UDP_WAKEUP;
}
/* Handle Endpoint Interrupts */
uint32_t i;
for (i = 0; i < 4; i++) {
if (isr & *AT91C_UDP_IMR & (1<<i))
udp_handle_ep(i);
}
/* clear all unhandled interrupts */
*AT91C_UDP_ICR = isr & (AT91C_UDP_RXSUSP | AT91C_UDP_RXRSM |
AT91C_UDP_ENDBUSRES | AT91C_UDP_WAKEUP);
}
void at91_udp_init(void)
{
/* configure & disable Pullup, disable Pullup von VBUS */
AT91PS_PIO pio = AT91C_BASE_PIOA;
pio->PIO_CODR = UDP_PULLUP;
pio->PIO_PER = UDP_PULLUP;
pio->PIO_OER = UDP_PULLUP;
// TODO: needed?
pio->PIO_PPUDR = UDP_VBUS_MON;
/* UDPCK (48MHz) = PLLCK / 2 */
*AT91C_CKGR_PLLR |= AT91C_CKGR_USBDIV_1;
/* enable UDP clocks */
*AT91C_PMC_SCER = AT91C_PMC_UDP;
*AT91C_PMC_PCER = (1 << AT91C_ID_UDP);
/* enable transmitter */
*AT91C_UDP_TXVC &= ~AT91C_UDP_TXVDIS;
/* clear & disable all UDP interrupts */
*AT91C_UDP_IDR = AT91C_UDP_EPINT0 | AT91C_UDP_EPINT1 | AT91C_UDP_EPINT2 |
AT91C_UDP_EPINT3 | AT91C_UDP_RXSUSP | AT91C_UDP_RXRSM |
AT91C_UDP_SOFINT | AT91C_UDP_WAKEUP;
*AT91C_UDP_ICR = AT91C_UDP_RXSUSP | AT91C_UDP_RXRSM | AT91C_UDP_SOFINT |
AT91C_UDP_ENDBUSRES | AT91C_UDP_WAKEUP ;
/* level triggered, own vector */
AT91S_AIC *aic = AT91C_BASE_AIC;
aic->AIC_SMR[AT91C_ID_UDP] = IRQPRIO_UDP | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
aic->AIC_SVR[AT91C_ID_UDP] = (uint32_t)udp_isr;
aic->AIC_IECR = (1 << AT91C_ID_UDP);
pio_trigger_isr(UDP_VBUS_MON);
}
static void udp_vbus_monitor(uint32_t status, uint32_t input)
{
if (input & UDP_VBUS_MON)
/* usb connected -> enable pullup */
*AT91C_PIOA_SODR = UDP_PULLUP;
else
/* usb got diconnected -> disable pullup */
*AT91C_PIOA_CODR = UDP_PULLUP;
}
PIO_PINCHANGE_ISR(UDP_VBUS_MON, udp_vbus_monitor);

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#include <stdint.h>

255
src/telemetrie.c
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/***************************************************************************
* Copyright (C) 02/2008 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "board.h" // ARRAY_SIZE()
#include "at91_pitc.h"
#include "telemetrie.h"
#include "memalloc.h"
#include "fifo.h"
/* extern symbols, defined in ldscript */
extern struct tdc_value _tdc_value_table;
extern struct tdc_value _tdc_value_table_end;
/* max. 8x 32 = 256 variables */
static uint32_t tdc_varmap[8];
/* array of devices, that are used to reach address X */
static struct comm_device *routing_table[8];
/*
* returns:
* -1: on routing error
* 0: no space left in txfifo (caller should retry)
* >0: success
*/
int32_t tdc_transmit(uint32_t addr, struct tdc_pkt_header *head)
{
if (addr >= ARRAY_SIZE(routing_table) || !routing_table[addr])
return -1;
return fifo_put(routing_table[addr]->txfifo, (char *)head, head->size);
}
static int32_t tdc_get_vars(void)
{
/* restart point */
static uint32_t id;
struct tdc_value *value = &_tdc_value_table + id;
while (value < &_tdc_value_table_end) {
uint32_t datalen = strlen(value->name);
struct tdc_getvars_reply *reply = alloc(sizeof(struct tdc_getvars_reply) + datalen);
reply->cmd = TDC_REPLY | TDC_ADDR1 | TDC_GETVARS;
reply->size = sizeof(struct tdc_getvars_reply) + datalen;
reply->id = id;
reply->flags = value->flags;
memcpy(reply->name, value->name, datalen);
uint32_t ret = tdc_transmit(TDC_ADDR0, ((struct tdc_pkt_header *)reply));
free(reply);
/* push routing error(-1) and retry(0) */
if (ret <= 0)
return ret;
id++;
value++;
}
/* dump complete, reset restart point */
id = 0;
return 1;
}
static int32_t tdc_get_value(uint32_t id)
{
struct tdc_value *value = &_tdc_value_table + id;
if (value >= &_tdc_value_table_end)
return -1;
uint32_t datalen = value->flags & TDC_SIZEMASK;
struct tdc_getvalue_reply *reply = alloc(sizeof(struct tdc_getvalue_reply) + datalen);
reply->cmd = TDC_REPLY | TDC_ADDR1 | TDC_GETVALUE;
reply->size = sizeof(struct tdc_getvars_reply) + datalen;
reply->id = id;
memcpy(reply->data, value->data, datalen);
int32_t ret = tdc_transmit(TDC_ADDR0, ((struct tdc_pkt_header *)reply));
free(reply);
return ret;
}
static int32_t tdc_set_value(uint32_t id, uint8_t *data)
{
struct tdc_value *value = &_tdc_value_table + id;
if (value >= &_tdc_value_table_end)
return -1;
uint32_t datalen = value->flags & TDC_SIZEMASK;
// TODO: atomic?
memcpy(value->data, data, datalen);
return 1;
}
static uint32_t tdc_timer_cb(struct pitc_timer *timer)
{
uint32_t i, j;
for (i = 0; i < ARRAY_SIZE(tdc_varmap); i++) {
uint32_t tmp = tdc_varmap[i];
for (j = 0; j < 32; j++) {
if (!tmp)
break;
if (tmp & 0x01) {
if (tdc_get_value(i * 32 + j) <= 0)
return PITC_REMOVE_TIMER;
}
tmp >>= 1;
}
}
return PITC_RESTART_TIMER;
}
static struct pitc_timer tdc_timer = {
.func = tdc_timer_cb,
};
static int32_t tdc_setup_timer(uint32_t interval, uint32_t *varmap)
{
memcpy(tdc_varmap, varmap, sizeof(tdc_varmap));
if (interval > 0) {
tdc_timer.interval = interval;
// TODO: timer already running
pitc_schedule_timer(&tdc_timer);
} else {
// TODO: timer stop
}
return 1;
}
static const struct tdc_hello_reply hello_reply = {
.cmd = TDC_REPLY | TDC_ADDR1 | TDC_HELLO,
.size = sizeof(struct tdc_hello_reply),
.name = "sam7fc-v0.01",
};
/*
* returns:
* -1: on routing error
* 0: no space left in txfifo (caller should retry)
* >0: success
*/
static int32_t tdc_parse_packet(struct tdc_pkt_header *head)
{
/* all replys go to the HOST */
if (head->cmd & TDC_REPLY)
return tdc_transmit(TDC_ADDR0, head);
/* forward this packet? */
if ((head->cmd & TDC_ADDRMASK) != TDC_ADDR1) {
uint32_t addr = (head->cmd & TDC_ADDRMASK) >> 4;
return tdc_transmit(addr, head);
}
int32_t ret = -1;
/* parse the packet */
switch (head->cmd & TDC_OPCODEMASK) {
case TDC_HELLO:
/* answer the hello */
ret = tdc_transmit(TDC_ADDR0, (struct tdc_pkt_header *)&hello_reply);
break;
case TDC_GETVARS:
ret = tdc_get_vars();
break;
case TDC_GETVALUE: {
struct tdc_getvalue_request *pkt = (struct tdc_getvalue_request *)head;
ret = tdc_get_value(pkt->id);
} break;
case TDC_SETVALUE: {
struct tdc_setvalue_request *pkt = (struct tdc_setvalue_request *)head;
ret = tdc_set_value(pkt->id, pkt->data);
} break;
case TDC_REQVALUES: {
struct tdc_reqvalues_request *pkt = (struct tdc_reqvalues_request *)head;
ret = tdc_setup_timer(pkt->interval, pkt->varmap);
} break;
};
/*
* on succes(>0) return size of request,
* and push retry(0) and routing error(-1) up
*/
return (ret > 0) ? head->size : ret;
}
void tdc_register_device(uint32_t addr, struct comm_device *device)
{
if (addr < ARRAY_SIZE(routing_table))
routing_table[addr] = device;
}
void tdc_receive(struct comm_device *device)
{
while (1) {
/* peek the header */
struct tdc_pkt_header tmp_head;
uint32_t len = fifo_peek(device->rxfifo, (char *)&tmp_head, sizeof(tmp_head));
if (len != sizeof(tmp_head))
return;
/* peek the whole packet */
struct tdc_pkt_header *head = alloc(tmp_head.size);
len = fifo_peek(device->rxfifo, (char *)head, tmp_head.size);
if (len != tmp_head.size)
return;
/* if it's a hello-request, remember the device as path to the host */
if ((head->cmd & (TDC_OPCODEMASK & TDC_DIR)) == TDC_HELLO)
tdc_register_device(TDC_ADDR0, device);
/* parse packet, remove data if no restart is needed */
int32_t ret = tdc_parse_packet(head);
free(head);
/* some tx-fifo was full(0), return to caller and let it retry */
if (!ret)
return;
/* success(>0) or routing error(-1) -> remove the packet */
fifo_remove(device->rxfifo, tmp_head.size);
}
}