113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <stdlib.h>
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#include "rpi.h"
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#include "fpga.h"
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struct ff_fpga {
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struct {
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int reset;
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int done;
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int cs;
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} pins;
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};
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int fpgaDone(struct ff_fpga *fpga) {
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return gpioRead(fpga->pins.done);
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}
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int fpgaResetSlave(struct ff_fpga *fpga) {
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// Put the FPGA into reset
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gpioSetMode(fpga->pins.reset, PI_OUTPUT);
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gpioWrite(fpga->pins.reset, 0);
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// Set the CS pin to a GPIO, which will let us control it
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gpioSetMode(fpga->pins.cs, PI_OUTPUT);
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// Set CS to 0, which will put the FPGA into slave mode
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gpioWrite(fpga->pins.cs, 0);
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usleep(10000); // XXX figure out correct sleep length here
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// Bring the FPGA out of reset
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gpioWrite(fpga->pins.reset, 1);
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usleep(1200); // 13.2.SPI Slave Configuration Process
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// Release the CS pin
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gpioWrite(fpga->pins.cs, 1);
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return 0;
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}
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int fpgaResetMaster(struct ff_fpga *fpga) {
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// Put the FPGA into reset
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gpioSetMode(fpga->pins.reset, PI_OUTPUT);
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gpioWrite(fpga->pins.reset, 0);
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// Set the CS pin to a GPIO, which will let us control it
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gpioSetMode(fpga->pins.cs, PI_OUTPUT);
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// Set CS to 1, which will put the FPGA into "self boot" mode
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gpioWrite(fpga->pins.cs, 1);
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usleep(10000); // XXX figure out correct sleep length here
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// Bring the FPGA out of reset
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gpioWrite(fpga->pins.reset, 1);
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usleep(1200); // 13.2.SPI Slave Configuration Process
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return 0;
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}
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int fpgaReset(struct ff_fpga *fpga) {
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// Put the FPGA into reset
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gpioSetMode(fpga->pins.reset, PI_OUTPUT);
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gpioWrite(fpga->pins.reset, 0);
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return 0;
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}
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int fpgaInit(struct ff_fpga *fpga) {
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// Put the FPGA into reset
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gpioSetMode(fpga->pins.reset, PI_OUTPUT);
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gpioWrite(fpga->pins.reset, 0);
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// Also monitor the C_DONE pin
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gpioSetMode(fpga->pins.done, PI_INPUT);
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return 0;
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}
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struct ff_fpga *fpgaAlloc(void) {
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struct ff_fpga *fpga = (struct ff_fpga *)malloc(sizeof(struct ff_fpga));
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memset(fpga, 0, sizeof(*fpga));
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return fpga;
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}
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void fpgaSetPin(struct ff_fpga *fpga, enum fpga_pin pin, int val) {
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switch (pin) {
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case FP_RESET: fpga->pins.reset = val; break;
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case FP_DONE: fpga->pins.done = val; break;
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case FP_CS: fpga->pins.cs = val; break;
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default: fprintf(stderr, "unrecognized pin: %d\n", pin); break;
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}
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}
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void fpgaFree(struct ff_fpga **fpga) {
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if (!fpga)
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return;
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if (!*fpga)
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return;
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free(*fpga);
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*fpga = NULL;
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}
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