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#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include "usrp_e.h"
// max length #define PKT_DATA_LENGTH 1016
static int packet_data_length;
static int fp;
static u_int32_t crc_tab[256];
// CRC code from http://www.koders.com/c/fid699AFE0A656F0022C9D6B9D1743E697B69CE5815.aspx
// GPLv2
static u_int32_t chksum_crc32_gentab(void)
{
unsigned long crc, poly;
unsigned long i, j;
poly = 0xEDB88320L;
for (i = 0; i < 256; i++) {
crc = i;
for (j = 8; j > 0; j--) {
if (crc & 1) {
crc = (crc >> 1) ^ poly;
} else {
crc >>= 1;
}
}
crc_tab[i] = crc;
}
}
static void *read_thread(void *threadid)
{
int cnt;
struct usrp_transfer_frame *rx_data;
int rx_pkt_cnt;
int i;
unsigned long crc;
unsigned int rx_crc;
printf("Greetings from the reading thread!\n");
// IMPORTANT: must assume max length packet from fpga
rx_data = malloc(2048);
rx_pkt_cnt = 0;
while (1) {
cnt = read(fp, rx_data, 2048);
if (cnt < 0)
printf("Error returned from read: %d\n", cnt);
rx_pkt_cnt++;
if (rx_pkt_cnt == 512) {
printf(".");
fflush(stdout);
rx_pkt_cnt = 0;
}
if (rx_data->flags & RB_OVERRUN)
printf("O");
crc = 0xFFFFFFFF;
for (i = 0; i < rx_data->len - 4; i++) {
crc = ((crc >> 8) & 0x00FFFFFF) ^
crc_tab[(crc ^ rx_data->buf[i]) & 0xFF];
}
rx_crc = *((int *) &rx_data[rx_data->len - 4]);
if (rx_crc != (crc & 0xFFFFFFFF)) {
printf("CRC Error, sent: %d, rx: %d\n",
rx_crc, (crc & 0xFFFFFFFF));
}
}
}
static void *write_thread(void *threadid)
{
int seq_number, i, cnt, tx_pkt_cnt;
int tx_len;
unsigned long crc;
struct usrp_transfer_frame *tx_data;
struct pkt *p;
printf("Greetings from the write thread!\n");
tx_data = malloc(2048);
while (1) {
tx_pkt_cnt++;
if (tx_pkt_cnt == 512) {
printf(".");
fflush(stdout);
}
if (tx_pkt_cnt == 1024) {
printf("'");
fflush(stdout);
}
if (tx_pkt_cnt == 1536) {
printf(":");
fflush(stdout);
tx_pkt_cnt = 0;
}
tx_len = 2048 - sizeof(struct usrp_transfer_frame) - sizeof(int);
crc = 0xFFFFFFFF;
for (i = 0; i < tx_len; i++) {
tx_data->buf[i] = rand() & 0xFF;
crc = ((crc >> 8) & 0x00FFFFFF) ^
crc_tab[(crc ^ tx_data->buf[i]) & 0xFF];
}
*((int *) &tx_data[tx_len]) = crc;
cnt = write(fp, tx_data, 2048);
if (cnt < 0)
printf("Error returned from write: %d\n", cnt);
// sleep(1);
}
}
int main(int argc, char *argv[])
{
pthread_t tx, rx;
long int t;
int fpga_config_flag ,decimation;
struct usrp_e_ctl16 d;
struct sched_param s = {
.sched_priority = 1
};
if (argc < 4) {
printf("%s t|w|rw decimation data_size\n", argv[0]);
return -1;
}
decimation = atoi(argv[2]);
packet_data_length = atoi(argv[3]);
fp = open("/dev/usrp_e0", O_RDWR);
printf("fp = %d\n", fp);
fpga_config_flag = 0;
if (strcmp(argv[1], "w") == 0)
fpga_config_flag |= (1 << 15);
else if (strcmp(argv[1], "r") == 0)
fpga_config_flag |= (1 << 14);
else if (strcmp(argv[1], "rw") == 0)
fpga_config_flag |= ((1 << 15) | (1 << 14));
fpga_config_flag |= decimation;
d.offset = 14;
d.count = 1;
d.buf[0] = fpga_config_flag;
ioctl(fp, USRP_E_WRITE_CTL16, &d);
sleep(1); // in case the kernel threads need time to start. FIXME if so
sched_setscheduler(0, SCHED_RR, &s);
if (fpga_config_flag & (1 << 14)) {
if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
printf("Failed to create rx thread\n");
exit(-1);
}
}
sleep(1);
if (fpga_config_flag & (1 << 15)) {
if (pthread_create(&tx, NULL, write_thread, (void *) t)) {
printf("Failed to create tx thread\n");
exit(-1);
}
}
sleep(10000);
printf("Done sleeping\n");
}
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