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jtag_functions.c
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#include <avr/io.h>
#include <util/delay_basic.h>
#include "jtag_defs.h"
#include "jtag_functions.h"
uint16_t jtag_delay=0;
//! initialize JTAG interface
void jtag_init(void)
{
JTAG_OUT=JTAG_PIN_TRST|JTAG_PIN_SRST; //passive state high
JTAG_DIR=JTAG_OUTPUT_MASK;
}
//! send taps through JTAG interface and recieve responce from TDO pin only
//! \parameter out_buffer - buffer of taps for output, data is packed TDI and TMS values a stored together
//! \parameter out_length - total number of pairs to send (maximum length is 4*255 samples)
//! \parameter in_buffer - buffer which will hold recieved data data will be packed
//! \return number of bytes used in the in_buffer
uint8_t jtag_tap_output_max_speed(const uint8_t *out_buffer, uint16_t out_length, uint8_t *in_buffer)
{
uint8_t tms_tdi;
uint8_t out_data;
uint8_t in_data = 0;
uint16_t out_buffer_index = 0;
uint16_t in_buffer_index = 0;
uint16_t out_length_index = 0;
#ifdef DEBUG
printf("Sending %d bits \r\n", dataFromHostSize);
#endif
while(1)
{
out_data = out_buffer[out_buffer_index++];
//First TMS/TDI/TDO
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
asm("nop");
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Second TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
asm("nop");
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Third TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
asm("nop");
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Fourth TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
asm("nop");
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(!(out_length_index%8))
{
in_buffer[in_buffer_index] = in_data;
in_buffer_index++;
in_data = 0;
}
if(out_length_index>=out_length)
break;
}
if(out_length_index%8)
in_buffer[in_buffer_index] = in_data>>(8-(out_length_index%8));
return (out_length+7)/8;
}
//! send taps through JTAG interface and recieve responce from TDO pin only
//! \parameter out_buffer - buffer of taps for output, data is packed TDI and TMS values a stored together
//! \parameter out_length - total number of pairs to send (maximum length is 4*255 samples)
//! \parameter in_buffer - buffer which will hold recieved data data will be packed
//! \return number of bytes used in the in_buffer
uint8_t jtag_tap_output_with_delay(const uint8_t *out_buffer, uint16_t out_length, uint8_t *in_buffer)
{
uint8_t tms_tdi;
uint8_t out_data;
uint8_t in_data = 0;
uint16_t out_buffer_index = 0;
uint16_t in_buffer_index = 0;
uint16_t out_length_index = 0;
#ifdef DEBUG
printf("Sending %d bits \r\n", dataFromHostSize);
#endif
while(1)
{
out_data = out_buffer[out_buffer_index++];
//First TMS/TDI/TDO
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Second TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Third TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Fourth TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
out_length_index++;
if(!(out_length_index%8))
{
in_buffer[in_buffer_index] = in_data;
in_buffer_index++;
in_data = 0;
}
if(out_length_index>=out_length)
break;
}
if(out_length_index%8)
in_buffer[in_buffer_index] = in_data>>(8-(out_length_index%8));
return (out_length+7)/8;
}
//! send taps through JTAG interface and recieve responce from TDO and EMU pins
//! \parameter out_buffer - buffer of taps for output, data is packed TDI and TMS values a stored together
//! \parameter out_length - total number of pairs to send (maximum length is 4*255 samples)
//! \parameter in_buffer - buffer which will hold recieved data data will be packed
//! \return number of bytes used in the in_buffer (equal to the input (length+3)/4
uint8_t jtag_tap_output_emu(const uint8_t *out_buffer,uint16_t out_length,uint8_t *in_buffer)
{
uint8_t tms_tdi;
uint8_t out_data;
uint8_t in_data = 0;
uint16_t out_buffer_index = 0;
uint16_t in_buffer_index = 0;
uint16_t out_length_index = 0;
while(1)
{
out_data = out_buffer[out_buffer_index++];
//First TMS/TDI/TDO
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_EMU))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Second TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_EMU))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Third TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_EMU))&0x80);
out_length_index++;
if(out_length_index>=out_length)
break;
//Fourth TMS/TDI/TDO
out_data = out_data>>2;
tms_tdi = out_data & JTAG_SIGNAL_MASK;
JTAG_OUT = ( JTAG_OUT & ( ~JTAG_SIGNAL_MASK ) ) | tms_tdi;
JTAG_OUT|=JTAG_CLK_HI;//CLK hi
_delay_loop_2(jtag_delay);
JTAG_OUT&=JTAG_CLK_LO;//CLK lo
_delay_loop_2(jtag_delay);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_TDO))&0x80);
in_data = in_data>>1;
in_data |= ((JTAG_IN<<(7-JTAG_PIN_EMU))&0x80);
out_length_index++;
if(!(out_length_index%4))
{
in_buffer[in_buffer_index] = in_data;
in_buffer_index++;
in_data = 0;
}
if(out_length_index>=out_length)
break;
}
if(out_length_index%4)
in_buffer[in_buffer_index] = in_data>>(8-2*(out_length_index%4));
return (out_length+3)/4;
}
//! return current status of TDO & EMU pins
//! \return packed result TDO - bit 0 , EMU bit 1
uint8_t jtag_read_input(void)
{
uint8_t data=JTAG_IN;
return ((data>>JTAG_PIN_TDO)&1)|(((data>>JTAG_PIN_EMU)&1)<<1);
}
//! set pin TRST
void jtag_set_trst(uint8_t trst)
{
JTAG_OUT= (JTAG_OUT&(~(1<<JTAG_PIN_TRST)))|(trst<<JTAG_PIN_TRST);
}
//! set pin SRST
void jtag_set_srst(uint8_t srst)
{
JTAG_OUT=(JTAG_OUT&(~(1<<JTAG_PIN_SRST))) |(srst<<JTAG_PIN_SRST);
}
//! set both srst and trst simultaneously
void jtag_set_trst_srst(uint8_t trst,uint8_t srst)
{
JTAG_OUT=(JTAG_OUT&(~ ((1<<JTAG_PIN_SRST)|(1<<JTAG_PIN_TRST)) ))|
(srst<<JTAG_PIN_SRST)|(trst<<JTAG_PIN_TRST);
}