//Entire file needs a rewrite, maybe routing table, for easy of transition in TAP controller
void UpdateState(int j_state, int iTMS)
{
switch(j_state)
{
case JTAG_RESET:
GPIO_SET(JTAG_TMS);
for(i=0; i<5; i++) //make sure we are in run-test/idle
{
nop_sleep(WAIT);
GPIO_CLR(JTAG_TCK);
nop_sleep(WAIT);
GPIO_SET(JTAG_TCK);
nop_sleep(WAIT);
}
GPIO_CLR(JTAG_TCK);
nop_sleep(WAIT);
jtag_state=JTAG_RESET;
break;
case JTAG_AUTO: //auto called when TMS is high, this one does no TMS=1,TCK=1
if((jtag_state & 0xFFE) < 15)
{
jtag_state++;
if(jtag_state > 5)
jtag_state = JTAG_RESET;
}
else if((jtag_state | 0x116) == 0x116) //if we are in UPDATE-IR/
jtag_state = JTAG_DR_SCAN;
break;
}
}
void syncJTAGs()
{
GPIO_SET(JTAG_TMS);
for(i=0; i<5; i++) //make sure we are in run-test/idle
{
nop_sleep(WAIT);
GPIO_CLR(JTAG_TCK);
nop_sleep(WAIT);
GPIO_SET(JTAG_TCK);
nop_sleep(WAIT);
}
GPIO_CLR(JTAG_TCK);
nop_sleep(WAIT);
send_cmd(0,0); //Idle clock
send_cmd(0,1); //SELECT-DR-SCAN
jtag_state = JTAG_DR_SCAN;
}
int setup_io()
{
/* open /dev/mem */
if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0)
{
printf("can't open /dev/mem \n");
return -1;
}
/* mmap GPIO */
gpio_map = mmap(
NULL, //Any adddress in our space will do
BLOCK_SIZE, //Map length
PROT_READ|PROT_WRITE,// Enable reading & writting to mapped memory
MAP_SHARED, //Shared with other processes
mem_fd, //File to map
GPIO_BASE);
close(mem_fd); //No need to keep mem_fd open after mmap
if (gpio_map == MAP_FAILED)
{
printf("mmap error %d\n", (int)gpio_map);
return -2;
}
// Always use volatile pointer!
gpio = (volatile unsigned *)gpio_map;
INP_GPIO(JTAG_TCK);
INP_GPIO(JTAG_TMS);
INP_GPIO(JTAG_TDI);
INP_GPIO(JTAG_TDO); //Receive output from Device to rpi
nop_sleep(WAIT);
OUT_GPIO(JTAG_TDI); //Send data from rpi to Device
OUT_GPIO(JTAG_TMS);
OUT_GPIO(JTAG_TCK);
nop_sleep(WAIT);
return 0;
}
