spi: spidev_test: add option to continuously transfer data
Add option to send+recv <size> bytes with <iter> iterations
and show the transfer rate every 5 seconds.
Example:
rate: tx 4235.2kbps, rx 4235.2kbps
total: tx 4882.8KB, rx 4882.8KB
Signed-off-by: Frode Isaksen <fisaksen@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/tools/spi/spidev_test.c b/tools/spi/spidev_test.c
index 816f119..8c590cd 100644
--- a/tools/spi/spidev_test.c
+++ b/tools/spi/spidev_test.c
@@ -18,6 +18,7 @@
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
+#include <time.h>
#include <sys/ioctl.h>
#include <linux/ioctl.h>
#include <sys/stat.h>
@@ -40,6 +41,9 @@ static char *output_file;
static uint32_t speed = 500000;
static uint16_t delay;
static int verbose;
+static int transfer_size;
+static int iterations;
+static int interval = 5; /* interval in seconds for showing transfer rate */
uint8_t default_tx[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@@ -156,13 +160,13 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
close(out_fd);
}
- if (verbose || !output_file)
+ if (verbose)
hex_dump(rx, len, 32, "RX");
}
static void print_usage(const char *prog)
{
- printf("Usage: %s [-DsbdlHOLC3]\n", prog);
+ printf("Usage: %s [-DsbdlHOLC3vpNR24SI]\n", prog);
puts(" -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n"
" -d --delay delay (usec)\n"
@@ -180,7 +184,9 @@ static void print_usage(const char *prog)
" -N --no-cs no chip select\n"
" -R --ready slave pulls low to pause\n"
" -2 --dual dual transfer\n"
- " -4 --quad quad transfer\n");
+ " -4 --quad quad transfer\n"
+ " -S --size transfer size\n"
+ " -I --iter iterations\n");
exit(1);
}
@@ -205,11 +211,13 @@ static void parse_opts(int argc, char *argv[])
{ "dual", 0, 0, '2' },
{ "verbose", 0, 0, 'v' },
{ "quad", 0, 0, '4' },
+ { "size", 1, 0, 'S' },
+ { "iter", 1, 0, 'I' },
{ NULL, 0, 0, 0 },
};
int c;
- c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
+ c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:vS:I:",
lopts, NULL);
if (c == -1)
@@ -270,6 +278,12 @@ static void parse_opts(int argc, char *argv[])
case '4':
mode |= SPI_TX_QUAD;
break;
+ case 'S':
+ transfer_size = atoi(optarg);
+ break;
+ case 'I':
+ iterations = atoi(optarg);
+ break;
default:
print_usage(argv[0]);
break;
@@ -336,6 +350,57 @@ static void transfer_file(int fd, char *filename)
close(tx_fd);
}
+static uint64_t _read_count;
+static uint64_t _write_count;
+
+static void show_transfer_rate(void)
+{
+ static uint64_t prev_read_count, prev_write_count;
+ double rx_rate, tx_rate;
+
+ rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);
+ tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);
+
+ printf("rate: tx %.1fkbps, rx %.1fkbps\n", rx_rate, tx_rate);
+
+ prev_read_count = _read_count;
+ prev_write_count = _write_count;
+}
+
+static void transfer_buf(int fd, int len)
+{
+ uint8_t *tx;
+ uint8_t *rx;
+ int i;
+
+ tx = malloc(len);
+ if (!tx)
+ pabort("can't allocate tx buffer");
+ for (i = 0; i < len; i++)
+ tx[i] = random();
+
+ rx = malloc(len);
+ if (!rx)
+ pabort("can't allocate rx buffer");
+
+ transfer(fd, tx, rx, len);
+
+ _write_count += len;
+ _read_count += len;
+
+ if (mode & SPI_LOOP) {
+ if (memcmp(tx, rx, len)) {
+ fprintf(stderr, "transfer error !\n");
+ hex_dump(tx, len, 32, "TX");
+ hex_dump(rx, len, 32, "RX");
+ exit(1);
+ }
+ }
+
+ free(rx);
+ free(tx);
+}
+
int main(int argc, char *argv[])
{
int ret = 0;
@@ -391,7 +456,25 @@ int main(int argc, char *argv[])
transfer_escaped_string(fd, input_tx);
else if (input_file)
transfer_file(fd, input_file);
- else
+ else if (transfer_size) {
+ struct timespec last_stat;
+
+ clock_gettime(CLOCK_MONOTONIC, &last_stat);
+
+ while (iterations-- > 0) {
+ struct timespec current;
+
+ transfer_buf(fd, transfer_size);
+
+ clock_gettime(CLOCK_MONOTONIC, ¤t);
+ if (current.tv_sec - last_stat.tv_sec > interval) {
+ show_transfer_rate();
+ last_stat = current;
+ }
+ }
+ printf("total: tx %.1fKB, rx %.1fKB\n",
+ _write_count/1024.0, _read_count/1024.0);
+ } else
transfer(fd, default_tx, default_rx, sizeof(default_tx));
close(fd);
