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new i2c protocol

master
Olaf Rempel 9 years ago
parent
ce8fbde9dd
commit
a7fcfaf7b9
2 changed files with 160 additions and 96 deletions
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  1. +3
    -4
      Makefile
  2. +157
    -92
      main.c

+ 3
- 4
Makefile View File

@@ -1,6 +1,6 @@
PRG = fc_boot
OBJ = main.o
MCU_TARGET = atmega644
MCU_TARGET = atmega644p
OPTIMIZE = -Os

DEFS =
@@ -22,7 +22,7 @@ $(PRG).elf: $(OBJ)
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)

clean:
rm -rf *.o *.lst *.map $(PRG).elf *.hex *.bin
rm -rf *.o $(PRG).lst $(PRG).map $(PRG).elf $(PRG).hex $(PRG).bin

lst: $(PRG).lst

@@ -41,5 +41,4 @@ bin: $(PRG).bin
$(OBJCOPY) -j .text -j .data -O binary $< $@

install: text
# uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
avrdude -p m644 -c butterfly -b 115200 -P /dev/ttyS0 -u -V -U flash:w:$(PRG).hex
avrdude -c dragon_isp -P usb -p m644p -B0.3 -V -U flash:w:$(PRG).hex

+ 157
- 92
main.c View File

@@ -22,39 +22,50 @@
#include <avr/pgmspace.h>
#include <avr/wdt.h>

#include <stdio.h>
/*
* ATMega 644P:
* Fuse E: 0xFD (2.7V BOD)
* Fuse H: 0xDA (2048 words bootloader)
* Fuse L: 0xFF (ext. Crystal)
*/

#define F_CPU 20000000
#include <util/delay.h>

#define BAUDRATE 19200
#define BAUDRATE 57600
#define UART_CALC_BAUDRATE(baudRate) ((uint32_t)(F_CPU) / ((uint32_t)(baudRate)*16) -1)

#define APP_END 0xF000
#define APP_END 0xF000

#define LED_RT (1<<PORTB0)
#define LED_GN (1<<PORTB1)
#define LED_RT (1<<PORTB0) /* low active */
#define LED_GN (1<<PORTB1) /* high active */

#define TWI_CLK 100000
#define TWI_ADDRESS_BASE 0x20 /* 0x21 - 0x24 */

#define WRITE_COOKIE 0x4711
#define TWI_DEVCODE 0x77 /* Mega8 */
#define OWN_DEVCODE 0x74 /* Mega644 */
#define OWN_SIGNATURE { 0x1E, 0x96, 0x0A } /* Mega644P */

/* SLA+R */
#define CMD_WAIT 0x00
#define CMD_GET_INFO 0x10
#define CMD_GET_SIGNATURE 0x11
#define CMD_WRITE_FLASH 0x12
#define CMD_READ_FLASH 0x13
#define CMD_WRITE_EEPROM 0x14
#define CMD_READ_EEPROM 0x15
#define CMD_BOOT_APPLICATION 0x1F

#define CMD_SET_PWM 0x21
#define CMD_GET_STATUS 0x22
// #define CMD_SET_PARAM 0x23
// #define CMD_GET_PARAM 0x24
#define CMD_BOOT_LOADER 0x2F

#define DEVCODE_M8 0x77
#define DEVCODE_M644 0x74
#define CMD_READ_VERSION 0x01
#define CMD_READ_MEMORY 0x02

/* SLA+W */
#define CMD_SWITCH_APPLICATION CMD_READ_VERSION
#define CMD_WRITE_MEMORY CMD_READ_MEMORY

/* CMD_SWITCH_APPLICATION parameter */
#define BOOTTYPE_BOOTLOADER 0x00
#define BOOTTYPE_APPLICATION 0x80

/* CMD_{READ|WRITE}_* parameter */
#define MEMTYPE_CHIPINFO 0x00
#define MEMTYPE_FLASH 0x01
#define MEMTYPE_EEPROM 0x02
#define MEMTYPE_PARAMETERS 0x03


static void sendchar(uint8_t data)
{
@@ -68,15 +79,14 @@ static uint8_t recvchar(void)
return UDR0;
}

static int uart_putchar(char c, FILE *stream)
static void print_byte(uint8_t val)
{
if (c == '\n')
uart_putchar('\r', stream);
sendchar(c);
return 0;
}
uint8_t tmp = (val >> 4) & 0x0F;
sendchar((tmp < 0x0A) ? ('0' + tmp) : ('a' - 0x0A + tmp));

static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
tmp = val & 0x0F;
sendchar((tmp < 0x0A) ? ('0' + tmp) : ('a' - 0x0A + tmp));
}

static uint8_t i2c_master_tx(uint8_t val)
{
@@ -104,14 +114,14 @@ static uint8_t i2c_master_rx(uint8_t *val, uint8_t ack)

static void i2c_stop(void)
{
PORTB &= ~LED_RT;
PORTB |= LED_RT;
TWCR = (1<<TWINT) | (1<<TWSTO) | (1<<TWEN);
}

static void i2c_start_address(uint8_t addr)
{
while (1) {
PORTB |= LED_RT;
PORTB &= ~LED_RT;
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
loop_until_bit_is_set(TWCR, TWINT);

@@ -125,7 +135,7 @@ static void i2c_start_address(uint8_t addr)
}

/* wait 100x 10ms */
static uint8_t boot_timeout = 100;
volatile static uint8_t boot_timeout = 100;

ISR(TIMER0_OVF_vect)
{
@@ -145,7 +155,9 @@ ISR(TIMER0_OVF_vect)
}

static uint16_t address;
static uint8_t page_buf[256];
static uint16_t page_size;
static uint8_t page_buf[SPM_PAGESIZE];


static void eraseFlash(void)
{
@@ -237,6 +249,9 @@ static uint16_t readEEpromPage(uint16_t address, uint16_t size)
return address;
}

/* 0-2: signature, 3: pagesize, 4-5: flash size, 6-7: eeprom size */
static uint8_t chipinfo[8];

void cmd_loop(void)
{
uint8_t i2c_dev = 0;
@@ -258,14 +273,15 @@ void cmd_loop(void)
// write address
} else if (val == 'A') {
address = recvchar();
address = (address<<8) | recvchar();
address = (address << 8) | recvchar();
sendchar('\r');

// Buffer load support
} else if (val == 'b') {
sendchar('Y');
sendchar((sizeof(page_buf) >> 8) & 0xFF);
sendchar(sizeof(page_buf) & 0xFF);
page_size = (i2c_dev == 0) ? sizeof(page_buf) : chipinfo[3];
sendchar((page_size >> 8) & 0xFF);
sendchar(page_size & 0xFF);

// Start buffer load
} else if (val == 'B') {
@@ -277,27 +293,17 @@ void cmd_loop(void)
size |= recvchar();
val = recvchar();

for (cnt = 0; cnt < sizeof(page_buf); cnt++)
for (cnt = 0; cnt < page_size; cnt++)
*tmp++ = (cnt < size) ? recvchar() : 0xFF;

if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
if (val == 'F') {
i2c_master_tx(CMD_WRITE_FLASH);
// FIXME: Flashwriting is not working. see bl_master (which works)

} else {
i2c_master_tx(CMD_WRITE_EEPROM);
/* no page align, transfer only needed bytes */
cnt = size;
}

i2c_master_tx(CMD_WRITE_MEMORY);
i2c_master_tx((val == 'F') ? MEMTYPE_FLASH : MEMTYPE_EEPROM);
i2c_master_tx(address >> 8);
i2c_master_tx(address & 0xFF);
address += sizeof(page_buf);

i2c_master_tx(WRITE_COOKIE >> 8);
i2c_master_tx(WRITE_COOKIE & 0xFF);
address += page_size;

tmp = page_buf;
while (cnt--)
@@ -322,11 +328,8 @@ void cmd_loop(void)

if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
if (val == 'F')
i2c_master_tx(CMD_READ_FLASH);
else
i2c_master_tx(CMD_READ_EEPROM);

i2c_master_tx(CMD_READ_MEMORY);
i2c_master_tx((val == 'F') ? MEMTYPE_FLASH : MEMTYPE_EEPROM);
i2c_master_tx(address >> 8);
i2c_master_tx(address & 0xFF);

@@ -363,18 +366,11 @@ void cmd_loop(void)
} else if (val == 'P') {
if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_BOOT_LOADER);
i2c_master_tx(CMD_SWITCH_APPLICATION);
i2c_master_tx(BOOTTYPE_BOOTLOADER);
i2c_stop();

_delay_ms(10);

i2c_start_address(i2c_dev);
i2c_master_tx(CMD_GET_SIGNATURE);
i2c_start_address(i2c_dev | 0x01);
i2c_master_rx(&val, 1);
i2c_master_rx(&val, 1);
i2c_master_rx(&val, 0);
i2c_stop();
}
sendchar('\r');

@@ -382,7 +378,8 @@ void cmd_loop(void)
} else if (val == 'L') {
if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_BOOT_APPLICATION);
i2c_master_tx(CMD_SWITCH_APPLICATION);
i2c_master_tx(BOOTTYPE_APPLICATION);
i2c_stop();
}
sendchar('\r');
@@ -393,7 +390,7 @@ void cmd_loop(void)

// Return device type
} else if (val == 't') {
sendchar((i2c_dev == 0) ? DEVCODE_M644 : DEVCODE_M8);
sendchar((i2c_dev == 0) ? OWN_DEVCODE : TWI_DEVCODE);
sendchar(0);

// clear and set LED ignored
@@ -424,14 +421,15 @@ void cmd_loop(void)
// Return Signature Bytes
} else if (val == 's') {
if (i2c_dev != 0) {
sendchar(0x07);
sendchar(0x93);
sendchar(0x1e);
sendchar(chipinfo[2]);
sendchar(chipinfo[1]);
sendchar(chipinfo[0]);

} else {
sendchar(0x09);
sendchar(0x96);
sendchar(0x1e);
uint8_t sig[3] = OWN_SIGNATURE;
sendchar(sig[2]);
sendchar(sig[1]);
sendchar(sig[0]);
}

// set i2c target
@@ -440,27 +438,20 @@ void cmd_loop(void)
sendchar(val);

} else if (val >= '1' && val <= '4') {
i2c_dev = (val - '1' + 0x21) << 1;
i2c_dev = (val - '0' + TWI_ADDRESS_BASE) << 1;
sendchar(val);
sendchar('<');

// test props
} else if (val == 'l') {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_SET_PWM);
i2c_master_tx(0x00);
i2c_master_tx(CMD_SWITCH_APPLICATION);
i2c_master_tx(BOOTTYPE_BOOTLOADER);
i2c_stop();

// test props
} else if (val == 'k') {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_SET_PWM);
i2c_master_tx(0x0f);
i2c_stop();
for (val = 0; val < 10; val++)
_delay_ms(10);

// get Info
} else if (val == 'I') {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_GET_INFO);
i2c_master_tx(CMD_READ_VERSION);
i2c_start_address(i2c_dev | 0x01);

uint8_t cnt;
@@ -471,6 +462,62 @@ void cmd_loop(void)

i2c_stop();

sendchar(',');

i2c_start_address(i2c_dev);
i2c_master_tx(CMD_READ_MEMORY);
i2c_master_tx(MEMTYPE_CHIPINFO);
i2c_master_tx(0x00);
i2c_master_tx(0x00);
i2c_start_address(i2c_dev | 0x01);

uint8_t i;
for (i = 0; i < sizeof(chipinfo); i++) {
uint8_t more = (i < (sizeof(chipinfo) -1));
i2c_master_rx(&chipinfo[i], more);

sendchar('0');
sendchar('x');
print_byte(chipinfo[i]);
sendchar(more ? ',' : '>');
}
i2c_stop();

// test props
} else if (val == 'k' || val == 'l') {
if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
i2c_master_tx(0x00 + (val - 'k') * 0x10);
i2c_stop();

sendchar(val);
}

// start Application / get Version
} else if (val == 'I') {
if (i2c_dev != 0) {
i2c_start_address(i2c_dev);
i2c_master_tx(CMD_SWITCH_APPLICATION);
i2c_master_tx(BOOTTYPE_APPLICATION);
i2c_stop();

for (val = 0; val < 10; val++)
_delay_ms(10);

i2c_start_address(i2c_dev);
i2c_master_tx(CMD_READ_VERSION);
i2c_start_address(i2c_dev | 0x01);

sendchar('<');
uint8_t cnt;
for (cnt = 0; cnt < 16; cnt++) {
i2c_master_rx(&val, (cnt != 15));
sendchar(val);
}
sendchar('>');
i2c_stop();
}

/* ESC */
} else if (val != 0x1b) {
sendchar('?');
@@ -478,12 +525,28 @@ void cmd_loop(void)
}
}

static void (*jump_to_app)(void) = 0x0000;
static void (*jump_to_app)(void) __attribute__ ((noreturn)) = 0x0000;

/*
* For newer devices the watchdog timer remains active even after a
* system reset. So disable it as soon as possible.
* automagically called on startup
*/
#if defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
void disable_wdt_timer(void) __attribute__((naked, section(".init3")));
void disable_wdt_timer(void)
{
MCUSR = 0;
WDTCSR = (1<<WDCE) | (1<<WDE);
WDTCSR = (0<<WDE);
}
#endif

int main(void) __attribute__ ((noreturn));
int main(void)
{
DDRB = LED_GN | LED_RT;
PORTB = LED_GN;
PORTB = LED_GN | LED_RT;

/* move interrupt-vectors to bootloader */
MCUCR = (1<<IVCE);
@@ -497,8 +560,6 @@ int main(void)
UCSR0B = (1<<TXEN0) | (1<<RXEN0);
UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);

stdout = &mystdout;

/* timer0: running with F_CPU/1024 */
TCCR0B = (1<<CS02) | (1<<CS00);

@@ -523,7 +584,11 @@ int main(void)
MCUCR = (1<<IVCE);
MCUCR = (0<<IVSEL);

jump_to_app();
PORTB = LED_RT;

return 0;
uint8_t i;
for (i = 0; i < 10; i++)
_delay_ms(10);

jump_to_app();
}

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