Raspberry Pi GPIO->JTAG

main.c

#include <stdio.h>
#include <makestuff.h>
#include <liberror.h>
#include <wiringPi.h>
#include "parser.h"

typedef enum {
    TCK = 7,
    TDO = 0,
    TDI = 9,
    TMS = 8
} Pins;

void setTCK(bool x) {
    digitalWrite(TCK, x ? HIGH : LOW);
}
void setTDI(bool x) {
    digitalWrite(TDI, x ? HIGH : LOW);
}
void setTMS(bool x) {
    digitalWrite(TMS, x ? HIGH : LOW);
}
bool getTDO(void) {
    return digitalRead(TDO) == HIGH;
}

int main(int argc, const char *argv[]) {
    int retVal;

    // Init library
    wiringPiSetup();

    // Validate command-line args
    if ( argc != 2 ) {
        fprintf(stderr, "Synopsis: %s <svf-file>\n", argv[0]);
        FAIL(1, exit);
    }

    // Setup pins
    pinMode(TCK, OUTPUT);
    pinMode(TMS, OUTPUT);
    pinMode(TDI, OUTPUT);
    pinMode(TDO, INPUT);

    // Parse .svf file
    const char *error = NULL;
    const struct ParserCallbacks cb = {
        setTCK, setTMS, setTDI, getTDO
    };
    ParserStatus pStatus = parse(&cb, argv[1], &error);
    CHECK_STATUS(pStatus, 2, cleanup);
    retVal = 0;
cleanup:
    if ( error ) {
        printf("%s\n", error);
        errFree(error);
    }
exit:
    pinMode(TCK, INPUT);
    pinMode(TMS, INPUT);
    pinMode(TDI, INPUT);
    pinMode(TDO, INPUT);
    return retVal;
}