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#include "defines.h"
#include <avr/io.h>
#include <util/delay.h>
#include <inttypes.h>
#include "clujtag.h"
#include "jtag.h"
#include "jtag_commands.h"
static uint8_t jtag_current_command = 0;
static uint16_t jtag_pos = 0;
static uint32_t jtag_tck_delay_value = 0;
static uint32_t jtag_num_tck = 0;
static uint32_t jtag_usecs = 0;
static uint16_t jtag_multi_count = 0;
static uint16_t jtag_multi_pos = 0;
static uint16_t jtag_multi_multi = 0;
static int byte_counter = 0;
static uint8_t ok = 0;
static uint8_t setup_counter = 0;
static void tck_delay(uint8_t tms, uint32_t num_tck, uint32_t usecs)
{
if (tms)
PORT |= (1<<TMS_PIN);
else
PORT &= ~(1<<TMS_PIN);
PORT |= 1<<TCK_PIN;
int i;
for (i = 0; i < num_tck; i++)
{
PORT ^= 1<<TCK_PIN;
PORT ^= 1<<TCK_PIN;
}
for (i = 0; i < usecs; i++)
_delay_us(1);
}
static uint8_t pulse_tck(int tms, int tdi, int tdo)
{
if (tms)
PORT |= (1<<TMS_PIN);
else
PORT &= ~(1<<TMS_PIN);
if (tdi >= 0)
{
if (tdi)
PORT |= (1<<TDI_PIN);
else
PORT &= ~(1<<TDI_PIN);
}
PORT &= ~(1<<TCK_PIN);
PORT |= 1<<TCK_PIN;
if (tdo < 0) return 1;
return ((PORT_PIN >> TDO_PIN) & 1) == tdo;
}
int jtag_parse_byte(uint8_t data)
{
int i, tms, tdi, tdo;
switch (jtag_current_command)
{
case 0:
jtag_current_command = data;
jtag_pos = 0;
break;
case JTAG_PULSE_TCK_DELAY:
if (jtag_pos == 0)
{
jtag_num_tck = 0;
jtag_usecs = 0;
jtag_tck_delay_value = data;
} else {
if ((jtag_pos < 4) && (jtag_tck_delay_value & 0b10)) // num_tck
{
jtag_num_tck |= (uint32_t)data << (8*(jtag_pos-1));
} else if ((jtag_pos < 4) && !(jtag_tck_delay_value & 0b10)) // usecs
{
jtag_usecs |= (uint32_t)data << (8*(jtag_pos-1));
} else {
jtag_usecs |= (uint32_t)data << (8*(jtag_pos-5));
}
}
if ( ((jtag_tck_delay_value & 0b110) == 0)
|| (((((jtag_tck_delay_value & 0b110) == 0b100) || (jtag_tck_delay_value & 0b110) == 0b010)) && jtag_pos == 4)
|| (((jtag_tck_delay_value & 0b110) == 0b110) && jtag_pos == 8)
)
{
tck_delay(jtag_tck_delay_value&1, jtag_num_tck, jtag_usecs);
jtag_current_command = 0;
}
jtag_pos++;
break;
case JTAG_PULSE_TCK_MULTI:
if (jtag_pos == 0)
{
jtag_multi_count = data;
jtag_multi_pos = 0;
jtag_multi_multi = 0;
} else if (jtag_pos == 1)
{
jtag_multi_count |= (uint16_t)data << 8;
} else {
if (!jtag_multi_multi && !(data & 0x80))
{
jtag_multi_multi = data;
} else {
if (!jtag_multi_multi) jtag_multi_multi = 1;
tms = data&1;
tdi = (data>>1)&1;
tdo = -1;
if (data & (1<<2))
{
tdo = (data>>3)&1;
}
for (i = 0; i < jtag_multi_multi; i++)
{
if (!pulse_tck(tms, tdi, tdo)) return 0;
jtag_multi_pos++;
}
jtag_multi_multi = 0;
}
if (jtag_multi_pos >= jtag_multi_count)
jtag_current_command = 0;
}
jtag_pos++;
break;
default:
return 0;
}
return 1;
}
void jtag_setup(void)
{
PORT &= ~((1<<TMS_PIN) | (1<<TDO_PIN) | (1<<TDI_PIN)) | (1<<TCK_PIN);
PORT_DDR |= (1<<TMS_PIN) | (1<<TCK_PIN) | (1<<TDI_PIN);
PORT_DDR &= ~(1<<TDO_PIN);
jtag_current_command = 0;
}
void jtag_shutdown(void)
{
PORT &= ~((1<<TMS_PIN) | (1<<TCK_PIN) | (1<<TDO_PIN) | (1<<TDI_PIN));
PORT_DDR &= ~((1<<TMS_PIN) | (1<<TCK_PIN) | (1<<TDO_PIN) | (1<<TDI_PIN));
}
int jtag_execute(uint8_t data)
{
if (ok)
LED_ON;
if (data == JTAG_SETUP)
{
setup_counter++;
if (setup_counter >= 16)
{
jtag_setup();
ok = 1;
byte_counter = 0;
return -1;
}
} else setup_counter = 0;
if (jtag_current_command == 0 && data == JTAG_SHUTDOWN)
{
jtag_shutdown();
byte_counter = ACK_STEP;
LED_OFF;
} else
if (jtag_current_command == 0 && data == JTAG_TDO_REQUEST)
{
byte_counter = 0;
return (PORT_PIN >> TDO_PIN) & 1;
} else
if (ok && !jtag_parse_byte(data))
{
ok = 0;
jtag_shutdown();
}
byte_counter++;
if (byte_counter >= ACK_STEP)
{
byte_counter = 0;
return ok;
}
LED_OFF;
return -1;
}
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