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/* This program is distributed under the GPL, version 2 */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ftdi.h>
#include "soft_uart.h"
static unsigned char last;
static struct suart_data su;
#define CLK_BIT 0x20
#define RST_BIT 0x08
#define IO_BIT 0x02
static void handle_sample(unsigned char c)
{
uint8_t rst = 0, io = 0, clk = 0;
if (c & RST_BIT)
rst = 1;
if (c & CLK_BIT)
clk = 1;
if (c & IO_BIT)
io = 1;
#if 0
if ((c & 0xf) != last) {
printf("%02x ", c & ~(CLK_BIT|IO_BIT));
}
last = c;
#endif
#if 0
if (c & RST_BIT)
printf("-");
else
printf("_");
#endif
#if 1
if (c & IO_BIT)
printf("-");
else
printf("_");
#endif
//suart_process_sample_bit(&su, clk, rst, io);
}
#define OVERSAMPLING 4
int main(int argc, char **argv)
{
struct ftdi_context ftdic;
int f,i;
unsigned char buf[1<<16];
//unsigned int sample_rate = 12900 * OVERSAMPLING; /* 192kS/s */
unsigned int sample_rate = (1 << 18);
memset(&su, 0, sizeof(su));
if (ftdi_init(&ftdic) < 0)
{
fprintf(stderr, "ftdi_init failed\n");
return EXIT_FAILURE;
}
f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);
if (f < 0 && f != -5)
{
fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
exit(-1);
}
printf("ftdi open succeeded: %d\n",f);
printf("enabling bitbang mode\n");
//ftdi_disable_bitbang(&ftdic);
//ftdi_set_line_property(&ftdic, 8, 1, EVEN);
ftdi_set_bitmode(&ftdic, 0x0, BITMODE_BITBANG);
ftdi_read_data_set_chunksize(&ftdic, sizeof(buf));
ftdi_set_latency_timer(&ftdic, 255);
//ftdi_set_latency_timer(&ftdic, 1);
//f = ftdi_set_baudrate(&ftdic, 300000);
f = ftdi_set_baudrate(&ftdic, sample_rate/16);
if (f < 0) {
fprintf(stderr, "error setting baudrate\n");
exit(1);
}
su.samplerate = sample_rate;
su.recip_etu = sample_rate / OVERSAMPLING;
su.num_bits = 8;
suart_init(&su);
while (1) {
memset(buf, 0, sizeof(buf));
f = ftdi_read_data(&ftdic, buf, sizeof(buf));
if (f < 0) {
fprintf(stderr,"read failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
exit(1);
}
//printf("ftdi returned %u (of %u)\n", f, sizeof(buf));
for (i = 0; i < f; i++) {
handle_sample(buf[i]);
}
fflush(stdout);
//num_samples += f;
}
printf("\n");
printf("disabling bitbang mode\n");
ftdi_disable_bitbang(&ftdic);
ftdi_usb_close(&ftdic);
ftdi_deinit(&ftdic);
}
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