115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
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/*******************************************************/
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/* file: ports.c */
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/* abstract: This file contains the routines to */
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/* output values on the JTAG ports, to read */
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/* the TDO bit, and to read a byte of data */
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/* from the prom */
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/* Revisions: */
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/* 12/01/2008: Same code as before (original v5.01). */
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/* Updated comments to clarify instructions.*/
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/* Add print in setPort for xapp058_example.exe.*/
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/*******************************************************/
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#include "ports.h"
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#include "hackrf_core.h"
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#include "cpld_jtag.h"
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#include "gpio.h"
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void delay_jtag(uint32_t duration)
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{
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#define DIVISOR (1024)
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#define MIN_NOP (8)
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uint32_t i;
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uint32_t delay_nop;
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/* @204Mhz duration of about 400ns for delay_nop=20 */
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if(duration < DIVISOR)
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{
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delay_nop = MIN_NOP;
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}else
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{
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delay_nop = (duration / DIVISOR) + MIN_NOP;
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}
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for (i = 0; i < delay_nop; i++)
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__asm__("nop");
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}
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/* setPort: Implement to set the named JTAG signal (p) to the new value (v).*/
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/* if in debugging mode, then just set the variables */
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void setPort(jtag_gpio_t* const gpio, short p, short val)
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{
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if (p==TMS) {
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if (val)
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gpio_set(gpio->gpio_tms);
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else
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gpio_clear(gpio->gpio_tms);
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} if (p==TDI) {
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if (val)
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gpio_set(gpio->gpio_tdi);
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else
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gpio_clear(gpio->gpio_tdi);
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} if (p==TCK) {
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if (val)
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gpio_set(gpio->gpio_tck);
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else
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gpio_clear(gpio->gpio_tck);
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}
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/* conservative delay */
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delay_jtag(20000);
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}
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/* toggle tck LH. No need to modify this code. It is output via setPort. */
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void pulseClock(jtag_gpio_t* const gpio)
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{
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setPort(gpio, TCK,0); /* set the TCK port to low */
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delay_jtag(200);
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setPort(gpio, TCK,1); /* set the TCK port to high */
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delay_jtag(200);
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}
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/* readByte: Implement to source the next byte from your XSVF file location */
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/* read in a byte of data from the prom */
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void readByte(unsigned char *data)
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{
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*data = cpld_jtag_get_next_byte();
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}
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/* readTDOBit: Implement to return the current value of the JTAG TDO signal.*/
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/* read the TDO bit from port */
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unsigned char readTDOBit(jtag_gpio_t* const gpio)
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{
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delay_jtag(2000);
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return gpio_read(gpio->gpio_tdo);;
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}
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/* waitTime: Implement as follows: */
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/* REQUIRED: This function must consume/wait at least the specified number */
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/* of microsec, interpreting microsec as a number of microseconds.*/
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/* REQUIRED FOR SPARTAN/VIRTEX FPGAs and indirect flash programming: */
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/* This function must pulse TCK for at least microsec times, */
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/* interpreting microsec as an integer value. */
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/* RECOMMENDED IMPLEMENTATION: Pulse TCK at least microsec times AND */
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/* continue pulsing TCK until the microsec wait */
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/* requirement is also satisfied. */
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void waitTime(jtag_gpio_t* const gpio, long microsec)
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{
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static long tckCyclesPerMicrosec = 1; /* must be at least 1 */
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long tckCycles = microsec * tckCyclesPerMicrosec;
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long i;
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/* This implementation is highly recommended!!! */
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/* This implementation requires you to tune the tckCyclesPerMicrosec
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variable (above) to match the performance of your embedded system
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in order to satisfy the microsec wait time requirement. */
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for ( i = 0; i < tckCycles; ++i )
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{
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pulseClock(gpio);
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}
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}
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