1 files changed, 187 insertions, 0 deletions
diff --git a/host/apps/omap_debug/usrp-e-loopback.c b/host/apps/omap_debug/usrp-e-loopback.c
new file mode 100644
index 000000000..929d65604
--- /dev/null
+++ b/host/apps/omap_debug/usrp-e-loopback.c
@@ -0,0 +1,187 @@
+#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 error;
+
+struct pkt {
+	int checksum;
+	int seq_num;
+	short data[];
+};
+
+static int fp;
+
+static int calc_checksum(struct pkt *p)
+{
+	int i, sum;
+
+	i = 0;
+	sum = 0;
+
+	for (i=0; i < packet_data_length; i++)
+		sum += p->data[i];
+
+	sum += p->seq_num;
+
+	return sum;
+}
+
+static void *read_thread(void *threadid)
+{
+	int cnt, prev_seq_num, pkt_count, seq_num_failure;
+	struct usrp_transfer_frame *rx_data;
+	struct pkt *p;
+	unsigned long bytes_transfered, elapsed_seconds;
+	struct timeval start_time, finish_time;
+
+	printf("Greetings from the reading thread!\n");
+
+	bytes_transfered = 0;
+	gettimeofday(&start_time, NULL);
+
+	// IMPORTANT: must assume max length packet from fpga
+	rx_data = malloc(sizeof(struct usrp_transfer_frame) + sizeof(struct pkt) + (1016 * 2));
+	p = (struct pkt *) ((void *)rx_data + offsetof(struct usrp_transfer_frame, buf));
+	//p = &(rx_data->buf[0]);
+	printf("Address of rx_data = %p, p = %p\n", rx_data, p);
+	printf("offsetof = %d\n", offsetof(struct usrp_transfer_frame, buf));
+	printf("sizeof rx data = %d\n", sizeof(struct usrp_transfer_frame) + sizeof(struct pkt));
+
+	prev_seq_num = 0;
+	pkt_count = 0;
+	seq_num_failure = 0;
+
+	while (1) {
+
+		cnt = read(fp, rx_data, 2048);
+		if (cnt < 0)
+			printf("Error returned from read: %d, sequence number = %d\n", cnt, p->seq_num);
+
+//		printf("Packet received, status = %X, len = %d\n", rx_data->status, rx_data->len);
+//		printf("p->seq_num = %d\n", p->seq_num);
+
+
+		pkt_count++;
+
+		if (p->seq_num != prev_seq_num + 1) {
+			printf("Sequence number fail, current = %X, previous = %X, pkt_count = %d\n",
+				p->seq_num, prev_seq_num, pkt_count);
+
+			seq_num_failure ++;
+			if (seq_num_failure > 2)
+				error = 1;
+		}
+
+		prev_seq_num = p->seq_num;
+
+		if (calc_checksum(p) != p->checksum) {
+			printf("Checksum fail packet = %X, expected = %X, pkt_count = %d\n",
+				calc_checksum(p), p->checksum, pkt_count);
+			error = 1;
+		}
+
+		bytes_transfered += rx_data->len;
+
+		if (bytes_transfered > (100 * 1000000)) {
+			gettimeofday(&finish_time, NULL);
+			elapsed_seconds = finish_time.tv_sec - start_time.tv_sec;
+
+			printf("RX data transfer rate = %f K Samples/second\n",
+				(float) bytes_transfered / (float) elapsed_seconds / 4000);
+
+
+			start_time = finish_time;
+			bytes_transfered = 0;
+		}
+
+
+//		printf(".");
+//		fflush(stdout);
+//		printf("\n");
+	}
+
+}
+
+static void *write_thread(void *threadid)
+{
+	int seq_number, i, cnt;
+	struct usrp_transfer_frame *tx_data;
+	struct pkt *p;
+
+	printf("Greetings from the write thread!\n");
+
+	tx_data = malloc(sizeof(struct usrp_transfer_frame) + sizeof(struct pkt) + (packet_data_length * 2));
+	p = (struct pkt *) ((void *)tx_data + offsetof(struct usrp_transfer_frame, buf));
+	printf("Address of tx_data = %p, p = %p\n", tx_data, p);
+
+	printf("sizeof rp_transfer_frame = %d, sizeof pkt = %d\n", sizeof(struct usrp_transfer_frame), sizeof(struct pkt));
+
+	for (i=0; i < packet_data_length; i++)
+//		p->data[i] = random() >> 16;
+		p->data[i] = i;
+
+	tx_data->status = 0xdeadbeef;
+	tx_data->len = 8 + packet_data_length * 2;
+
+	printf("tx_data->len = %d\n", tx_data->len);
+
+	seq_number = 1;
+
+	while (1) {
+//		printf("tx status = %X, len = %d\n", tx_data->status, tx_data->len);
+		p->seq_num = seq_number++;
+		p->checksum = calc_checksum(p);
+		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;
+	struct sched_param s = {
+		.sched_priority = 1
+	};
+
+	if (argc < 2) {
+		printf("%s data_size\n", argv[0]);
+		return -1;
+	}
+
+	packet_data_length = atoi(argv[1]);
+
+	fp = open("/dev/usrp_e0", O_RDWR);
+	printf("fp = %d\n", fp);
+
+	sched_setscheduler(0, SCHED_RR, &s);
+	error = 0;
+
+	if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
+		printf("Failed to create rx thread\n");
+		exit(-1);
+	}
+
+	sleep(1);
+
+	if (pthread_create(&tx, NULL, write_thread, (void *) t)) {
+		printf("Failed to create tx thread\n");
+		exit(-1);
+	}
+
+	while (!error)
+		sleep(1);
+
+	printf("Done sleeping\n");
+}