On 17.11.2015 16:24, Joshua Clayton wrote:
Add input file support to facilitate testing larger data.
Signed-off-by: Joshua Clayton <[email protected]>
---
Documentation/spi/spidev_test.c | 42 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/Documentation/spi/spidev_test.c b/Documentation/spi/spidev_test.c
index 1ed9110..ef812ad 100644
--- a/Documentation/spi/spidev_test.c
+++ b/Documentation/spi/spidev_test.c
@@ -19,6 +19,7 @@
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
+#include <sys/stat.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
@@ -33,6 +34,7 @@ static void pabort(const char *s)
static const char *device = "/dev/spidev1.1";
static uint32_t mode;
static uint8_t bits = 8;
+static char *input_file;
static uint32_t speed = 500000;
static uint16_t delay;
static int verbose;
@@ -144,6 +146,7 @@ static void print_usage(const char *prog)
" -s --speed max speed (Hz)\n"
" -d --delay delay (usec)\n"
" -b --bpw bits per word \n"
+ " -i --input input data from a file (e.g. \"test.bin\")\n"
" -l --loop loopback\n"
" -H --cpha clock phase\n"
" -O --cpol clock polarity\n"
@@ -167,6 +170,7 @@ static void parse_opts(int argc, char *argv[])
{ "speed", 1, 0, 's' },
{ "delay", 1, 0, 'd' },
{ "bpw", 1, 0, 'b' },
+ { "input", 1, 0, 'i' },
{ "loop", 0, 0, 'l' },
{ "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' },
@@ -182,7 +186,8 @@ static void parse_opts(int argc, char *argv[])
};
int c;
- c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts,
NULL);
+ c = getopt_long(argc, argv, "D:s:d:b:i:lHOLC3NR24p:v",
+ lopts, NULL);
if (c == -1)
break;
@@ -200,6 +205,9 @@ static void parse_opts(int argc, char *argv[])
case 'b':
bits = atoi(optarg);
break;
+ case 'i':
+ input_file = optarg;
+ break;
case 'l':
mode |= SPI_LOOP;
break;
@@ -259,6 +267,33 @@ static void transfer_escaped_string(int fd, char *str)
free(tx);
}
+static void transfer_file(int fd, char *filename)
+{
+ ssize_t bytes;
+ struct stat sb;
+ int tx_fd;
+ uint8_t *tx;
+
+ if (stat(filename, &sb) == -1)
+ pabort("can't stat input file");
+
+ if (sb.st_size > 4096)
+ pabort("input file exceeds spidev's 4k limit");
This is not a true. IIRC PAGE_SIZE is the default buffer size for
spidev, but can be changed using bufsiz module parameter.
Just 'insmod spidev bufsiz=X', where X is number of bytes.
+
+ tx_fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ pabort("can't open input file");
+
+ tx = malloc(sb.st_size);
It would be good to check new allocations for fail.
+ bytes = read(tx_fd, tx, sb.st_size);
+ if (bytes != sb.st_size)
+ pabort("failed to read input file");
+
+ transfer(fd, tx, sb.st_size);
+ free(tx);
+ close(tx_fd);
+}
+
int main(int argc, char *argv[])
{
int ret = 0;
@@ -307,8 +342,13 @@ int main(int argc, char *argv[])
printf("bits per word: %d\n", bits);
printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
+ if (input_tx && input_file)
+ pabort("only one of -p and --input may be selected");
+
if (input_tx)
transfer_escaped_string(fd, input_tx);
+ else if (input_file)
+ transfer_file(fd, input_file);
else
transfer(fd, default_tx, sizeof(default_tx));
--
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