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epromsim
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master
Olaf Rempel 11 months ago
parent
5e460cb33f
commit
dd1cdcbeb9
2 changed files with 339 additions and 100 deletions
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  1. +2
    -2
      Makefile
  2. +337
    -98
      main.c

+ 2
- 2
Makefile View File

@@ -11,8 +11,8 @@ MCU=attiny2313
AVRDUDE_MCU=attiny2313

AVRDUDE_FUSES=lfuse:w:0xff:m hfuse:w:0xdb:m efuse:w:0xff:m
#AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ispprog
AVRDUDE_PROG := -c dragon_isp -P usb
AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ispprog
#AVRDUDE_PROG := -c dragon_isp -P usb

# ---------------------------------------------------------------------------



+ 337
- 98
main.c View File

@@ -65,11 +65,62 @@

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

/* ************************************************************************* */

#define MSGTYPE_VERSION_REQ 0x01 /* no payload */
#define MSGTYPE_PAGESIZE_REQ 0x02 /* no payload */
#define MSGTYPE_CONFIG_REQ 0x03 /* eprom_type(1), pagesize(1), reset_polarity(1) */
#define MSGTYPE_PROGMODE_REQ 0x04 /* progmode(1) */
#define MSGTYPE_SETADDRESS_REQ 0x05 /* address(3) msb first */
#define MSGTYPE_WRITE_REQ 0x06 /* data(0-pagesize) */
#define MSGTYPE_READ_REQ 0x07 /* length(1) */

#define MSGTYPE_ERROR_RSP 0x80 /* error_code(1) */
#define MSGTYPE_VERSION_RSP 0x81 /* version(?) */
#define MSGTYPE_PAGESIZE_RSP 0x82 /* pagesize(1) */
#define MSGTYPE_CONFIG_RSP 0x83 /* no payload */
#define MSGTYPE_PROGMODE_RSP 0x84 /* no payload */
#define MSGTYPE_SETADDRESS_RSP 0x85 /* no payload */
#define MSGTYPE_WRITE_RSP 0x86 /* no payload */
#define MSGTYPE_READ_RSP 0x87 /* data(0-pagesize) */

#define SUCCESS 0x00
#define ERROR_UNKNOWN_COMMAND 0x01 /* unknown message type */
#define ERROR_NOT_SUPPORTED 0x02 /* command not supported */
#define ERROR_INVALID_MODE 0x03 /* invalid progmode */
#define ERROR_INVALID_PARAMETER 0x04 /* invalid parameter in request */
#define ERROR_INVALID_ADDRESS 0x05 /* write outside of configured region */

#define RESET_POLARITY_LOW 0x00 /* low active reset */
#define RESET_POLARITY_HIGH 0x01 /* high active reset */

#define EPROM_TYPE_2K 0x02 /* 2716 */
#define EPROM_TYPE_4K 0x04 /* 2732 */
#define EPROM_TYPE_8K 0x08 /* 2764 */
#define EPROM_TYPE_16K 0x10 /* 27128 */
#define EPROM_TYPE_32K 0x20 /* 27256 */
#define EPROM_TYPE_64K 0x40 /* 27512 */
#define EPROM_TYPE_128K 0x80 /* 27010 */

#define PROGMODE_DISABLED 0x00 /* target running, no write access to RAM */
#define PROGMODE_ENABLED 0x01 /* target reset, write access to RAM */

#define PAGESIZE_MAX 128

/* ************************************************************************* */

struct _globdata {
uint8_t address_mask;
uint8_t reset_polarity;
uint32_t address_max;
uint32_t address;

uint8_t progmode;
uint8_t reset_polarity;
uint8_t pagesize;

uint8_t address_mask;
};

static const uint8_t version_str[] = "epromsim v1.00";
static struct _globdata gdata = { 0 };


@@ -100,10 +151,14 @@ static void shift_data(uint8_t data)
{
uint8_t mask;

for (mask = 0x01; mask != 0; mask <<= 1) {
if (data & mask) {
for (mask = 0x01; mask != 0; mask <<= 1)
{
if (data & mask)
{
PORTB |= (1<<SREG_DAT);
} else {
}
else
{
PORTB &= ~(1<<SREG_DAT);
}

@@ -126,32 +181,69 @@ static void store_pulse(void)


/* *************************************************************************
* write pulse for SRAM and increment counter
* write pulse for SRAM
* ************************************************************************* */
static void write_inc_pulse(void)
static void write_pulse(void)
{
/* positive edge clocks in data */
PORTB &= ~(1<<nRAM_WR);
PORTB |= (1<<nRAM_WR);
} /* write_pulse */


/* *************************************************************************
* reset address counter
* ************************************************************************* */
static void address_reset(void)
{
PORTD &= ~(1<<nTARGET_EN);
PORTD |= (1<<nTARGET_EN);
} /* address_reset */


/* *************************************************************************
* increment address counter
* ************************************************************************* */
static void address_inc_pulse(void)
{
/* positive edge increments counter */
PORTB |= (1<<CNT_CLK);
PORTB &= ~(1<<CNT_CLK);
} /* write_inc_pulse */
} /* address_inc_pulse */


/* *************************************************************************
* controls A16 line
* ************************************************************************* */
static void address_set_a16(uint8_t enable)
{
if (enable)
{
PORTD |= (1<<EMU_A16);
}
else
{
PORTD &= ~(1<<EMU_A16);
}
} /* address_set_a16 */


/* *************************************************************************
* switch access to RAM between emulator and target
* ************************************************************************* */
static void do_reset(uint8_t enable)
static void set_progmode(uint8_t progmode)
{
if (enable) {
gdata.progmode = progmode;

if (progmode)
{
/* switch RAM access to EMU */
PORTD |= (1<<nTARGET_EN);
PORTD &= ~(1<<nLED_RT);
PORTB &= ~(1<<nEMU_EN);

} else {
}
else
{
/* set eprom address line mask */
shift_data(gdata.address_mask);
shift_data(0x00);
@@ -161,109 +253,136 @@ static void do_reset(uint8_t enable)
PORTB |= (1<<nEMU_EN);
PORTD &= ~(1<<nTARGET_EN);
PORTD |= (1<<nLED_RT);

/* address counter is reset */
gdata.address = 0x00;
}

/* set RESET_OUT */
if (enable ^ gdata.reset_polarity) {
if (progmode ^ gdata.reset_polarity)
{
PORTB &= ~(1<<RESET_OUT);
} else {
}
else
{
PORTB |= (1<<RESET_OUT);
}
} /* do_reset */
} /* set_progmode */


/* *************************************************************************
* configures number of addresslines and loads data from UART into RAM
* set_address
* ************************************************************************* */
static void do_load(uint8_t type, uint32_t length)
static void set_address(uint32_t address)
{
uint32_t size;
switch (type) {
case 0x02: /* 2716 - 2kB */
size = 0x0800;
gdata.address_mask = 0x00;
break;

case 0x04: /* 2732 - 4kB */
size = 0x1000;
gdata.address_mask = 0x80;
break;

case 0x08: /* 2764 - 8kB */
size = 0x2000;
gdata.address_mask = 0xC0;
break;

case 0x10: /* 27128 - 16kB */
size = 0x4000;
gdata.address_mask = 0xE0;
break;

case 0x20: /* 27256 - 32kB */
size = 0x8000;
gdata.address_mask = 0xF0;
break;
/* reset address counter */
if (address < gdata.address)
{
address_reset();
gdata.address = 0;
}

case 0x40: /* 27512 - 64kB */
size = 0x10000;
gdata.address_mask = 0xF8;
break;
// TODO: A16 is not controlled by counter

default:
case 0x80: /* 27010 - 128kB */
size = 0x20000;
gdata.address_mask = 0xFC;
break;
while (gdata.address++ < address)
{
address_inc_pulse();
}
} /* set_address */

do_reset(1);

uint32_t i;
uint8_t data;
for (i = 0; i < size; i++) {
if (i > 0xFFFF) {
PORTD |= (1<<EMU_A16);
} else {
PORTD &= ~(1<<EMU_A16);
}
/* *************************************************************************
* write_data
* ************************************************************************* */
static void write_data(uint8_t length)
{
while (length--)
{
address_set_a16(gdata.address++ > 0xFFFF);

data = (i < length) ? ser_recv() : 0xFF;
shift_data(data);
shift_data(ser_recv());
store_pulse();
write_inc_pulse();
write_pulse();
address_inc_pulse();
}

do_reset(0);
} /* do_load */
} /* write_data */


/* *************************************************************************
* clears whole RAM (writes 0xFF)
* fill RAM with 0xFF
* ************************************************************************* */
static void do_clear(void)
{
do_reset(1);
uint16_t i = 0xFFFF;

shift_data(0xFF);

uint16_t i = 0xFFFF;

PORTD &= ~(1<<EMU_A16);
do {
store_pulse();
write_inc_pulse();
write_pulse();
address_inc_pulse();
} while (i--);

PORTD |= (1<<EMU_A16);
do {
store_pulse();
write_inc_pulse();
write_pulse();
address_inc_pulse();
} while (i--);

do_reset(0);
} /* do_clear */


/* *************************************************************************
* configures number of addresslines
* ************************************************************************* */
static uint8_t set_eprom_type(uint8_t type)
{
switch (type)
{
case EPROM_TYPE_2K:
gdata.address_max = 0x0800;
gdata.address_mask = 0x00;
break;

case EPROM_TYPE_4K:
gdata.address_max = 0x1000;
gdata.address_mask = 0x80;
break;

case EPROM_TYPE_8K:
gdata.address_max = 0x2000;
gdata.address_mask = 0xC0;
break;

case EPROM_TYPE_16K:
gdata.address_max = 0x4000;
gdata.address_mask = 0xE0;
break;

case EPROM_TYPE_32K:
gdata.address_max = 0x8000;
gdata.address_mask = 0xF0;
break;

case EPROM_TYPE_64K:
gdata.address_max = 0x10000;
gdata.address_mask = 0xF8;
break;

case EPROM_TYPE_128K:
gdata.address_max = 0x20000;
gdata.address_mask = 0xFC;
break;

default:
return ERROR_INVALID_PARAMETER;
}

return SUCCESS;
} /* set_eprom_type */


#if 0
/* Powerfail / Wakeup */
ISR(INT0_vect)
@@ -325,44 +444,164 @@ int main(void)
PORTD &= ~((1<<nLED_GN) | (1<<nTARGET_EN));

/* init RAM */
gdata.address_mask = 0x3F;
set_eprom_type(EPROM_TYPE_128K);
set_progmode(PROGMODE_ENABLED);
do_clear();
set_progmode(PROGMODE_DISABLED);

while (1)
{
uint8_t msgtype = ser_recv();
uint8_t length = ser_recv();
uint8_t error_code = ERROR_INVALID_PARAMETER;

switch (msgtype)
{
case MSGTYPE_VERSION_REQ:
if (length == 0x00)
{
ser_send(MSGTYPE_VERSION_RSP);
ser_send(sizeof(version_str) -1);

while (1) {
uint8_t cmd = ser_recv();
const uint8_t * p_data = version_str;
while (*p_data)
{
ser_send(*p_data++);
}

switch (cmd) {
case 'p': /* low active reset */
gdata.reset_polarity = 0;
ser_send('\n');
error_code = SUCCESS;
}
break;

case 'P': /* high active reset */
gdata.reset_polarity = 1;
ser_send('\n');
case MSGTYPE_PAGESIZE_REQ:
if (length == 0x00)
{
ser_send(MSGTYPE_PAGESIZE_RSP);
ser_send(0x01);
ser_send(PAGESIZE_MAX);

error_code = SUCCESS;
}
break;

case 'r': /* reset pulse */
do_reset(1);
_delay_ms(10);
do_reset(0);
ser_send('\n');
case MSGTYPE_CONFIG_REQ:
if (length == 0x03)
{
uint8_t eprom_type = ser_recv();
uint8_t pagesize = ser_recv();
uint8_t reset_polarity = ser_recv();

if (gdata.progmode == PROGMODE_ENABLED)
{
error_code = ERROR_INVALID_MODE;
}
else
{
if ((reset_polarity <= RESET_POLARITY_HIGH) &&
(pagesize <= PAGESIZE_MAX) &&
(set_eprom_type(eprom_type) == SUCCESS)
)
{
gdata.pagesize = pagesize;
gdata.reset_polarity = reset_polarity;

ser_send(MSGTYPE_CONFIG_RSP);
ser_send(0x00);
error_code = SUCCESS;
}
}
}
break;

case 'l': /* load eprom content */
case MSGTYPE_PROGMODE_REQ:
if (length == 0x01)
{
uint8_t type = ser_recv();
uint32_t length = (uint32_t)ser_recv() << 16;
length |= ser_recv() << 8;
length |= ser_recv();
uint8_t progmode = ser_recv();

do_load(type, length);
if (progmode <= PROGMODE_ENABLED)
{
set_progmode(progmode);

ser_send(MSGTYPE_PROGMODE_RSP);
ser_send(0x00);
error_code = SUCCESS;
}
}
break;

case MSGTYPE_SETADDRESS_REQ:
if (length == 0x03)
{
uint32_t address;

address = ser_recv();
address = (address << 8) | ser_recv();
address = (address << 8) | ser_recv();

if (address < gdata.address_max)
{
if (gdata.progmode == PROGMODE_DISABLED)
{
error_code = ERROR_INVALID_MODE;
}
else
{
set_address(address);

ser_send(MSGTYPE_SETADDRESS_RSP);
ser_send(0x00);
error_code = SUCCESS;
}
}
}
break;

case MSGTYPE_WRITE_REQ:
if ((length > 0) &&
(length <= gdata.pagesize)
)
{
if ((gdata.address >= gdata.address_max) ||
((gdata.address + length) > gdata.address_max)
)
{
error_code = ERROR_INVALID_ADDRESS;
}
else if (gdata.progmode == PROGMODE_DISABLED)
{
error_code = ERROR_INVALID_MODE;
}
else
{
write_data(length);

ser_send(MSGTYPE_WRITE_RSP);
ser_send(0x00);
error_code = SUCCESS;
}
}
break;

case MSGTYPE_READ_REQ:
error_code = ERROR_NOT_SUPPORTED;
break;

default:
ser_send('?');
error_code = ERROR_UNKNOWN_COMMAND;
break;
}

if (error_code != SUCCESS)
{
/* read remaining request */
while (length--)
{
(void)ser_recv();
}

ser_send(MSGTYPE_ERROR_RSP);
ser_send(0x01);
ser_send(error_code);
}
}
}
} /* main */

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