[PATCH] spi: spidev_test: Added functionalities
From: Adrian Remonda
Date: Wed Feb 25 2015 - 14:09:18 EST
This is a patch that add functionalities to the spidev_test tool found
in Documentation/spi/spidev_test.c.
- Cleaned hexadecimal dump
- Added verbose mode to see the transmitting sequence
- Added input buffer from the terminal. Now it is possible to send
string and hexadecimal data as an input parameter:
Example that shows verbose mode and a sending sequence:
root@microZed:~# ./a.out -D /dev/spidev32766.1 -p "\x23ab1" -v
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 23 61 62 31 __ __ __ __ | #ab1
RX | FF FF FF FF __ __ __ __ | ....
modified: Documentation/spi/spidev_test.c
Signed-off-by: Adrian Remonda <adrianremonda@xxxxxxxxx>
---
Documentation/spi/spidev_test.c | 118 +++++++++++++++++++++++++++++++++-------
1 file changed, 98 insertions(+), 20 deletions(-)
diff --git a/Documentation/spi/spidev_test.c b/Documentation/spi/spidev_test.c
index 3a2f9d59edab..7fe5ba4b9072 100644
--- a/Documentation/spi/spidev_test.c
+++ b/Documentation/spi/spidev_test.c
@@ -15,6 +15,7 @@
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
@@ -34,24 +35,55 @@ static uint32_t mode;
static uint8_t bits = 8;
static uint32_t speed = 500000;
static uint16_t delay;
+static int verbose;
-static void transfer(int fd)
+uint8_t default_tx[] = {
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xF0, 0x0D,
+};
+
+uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
+char *input_tx;
+
+static void hexDump(const void *src, size_t length, size_t bLine, char *prefix)
+{
+ int i = 0;
+ char *address = (char *)src;
+ char *line = (char *)address;
+ unsigned char c;
+
+ printf("%s | ", prefix);
+ while (length-- > 0) {
+ printf("%02X ", (unsigned char)*address++);
+ if (!(++i % bLine) || (length == 0 && i % bLine)) {
+ if (length == 0) {
+ while (i++ % bLine)
+ printf("__ ");
+ }
+ printf(" | "); /* right close */
+ while (line < address) {
+ c = *line++;
+ printf("%c", (c < 33 || c == 255) ? 0x2E : c);
+ }
+ printf("\n");
+ if (length > 0)
+ printf("%s | ", prefix);
+ }
+ }
+}
+
+static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
{
int ret;
- uint8_t tx[] = {
- 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
- 0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
- 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
- 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
- 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
- 0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD,
- 0xF0, 0x0D,
- };
- uint8_t rx[ARRAY_SIZE(tx)] = {0, };
+
struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
.rx_buf = (unsigned long)rx,
- .len = ARRAY_SIZE(tx),
+ .len = len,
.delay_usecs = delay,
.speed_hz = speed,
.bits_per_word = bits,
@@ -76,27 +108,54 @@ static void transfer(int fd)
if (ret < 1)
pabort("can't send spi message");
- for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {
- if (!(ret % 6))
- puts("");
- printf("%.2X ", rx[ret]);
+ if (verbose)
+ hexDump(tx, len, 32, "TX");
+ hexDump(rx, len, 32, "RX");
+}
+
+/*
+ * Unescape - process hexadecimal escape character
+ * converts shell input "\x23" -> 0x23
+ */
+int unespcape(char *dst, char *src, size_t len)
+{
+ int ret = 0;
+ char *pSrc = src;
+ char *pDst = dst;
+ unsigned int ch;
+
+ while (*pSrc) {
+ if (*pSrc == '\\' && *(pSrc+1) == 'x') {
+ sscanf(pSrc + 2, "%2x", &ch);
+ pSrc += 4;
+ *pDst++ = (unsigned char)ch;
+ } else {
+ *pDst++ = *pSrc++;
+ }
+
+
+ ret++;
}
- puts("");
+ return ret;
+
}
static void print_usage(const char *prog)
{
+
printf("Usage: %s [-DsbdlHOLC3]\n", prog);
puts(" -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n"
" -d --delay delay (usec)\n"
- " -b --bpw bits per word \n"
+ " -b --bpw bits per word\n"
" -l --loop loopback\n"
" -H --cpha clock phase\n"
" -O --cpol clock polarity\n"
" -L --lsb least significant bit first\n"
" -C --cs-high chip select active high\n"
" -3 --3wire SI/SO signals shared\n"
+ " -v --verbose Verbose (show tx buffer)\n"
+ " -p Send data (e.g. \"1234\\xde\\xad\")\n"
" -N --no-cs no chip select\n"
" -R --ready slave pulls low to pause\n"
" -2 --dual dual transfer\n"
@@ -120,13 +179,14 @@ static void parse_opts(int argc, char *argv[])
{ "3wire", 0, 0, '3' },
{ "no-cs", 0, 0, 'N' },
{ "ready", 0, 0, 'R' },
+ { "verbose", 0, 0, 'v' },
{ "dual", 0, 0, '2' },
{ "quad", 0, 0, '4' },
{ NULL, 0, 0, 0 },
};
int c;
- c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24", lopts, NULL);
+ c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL);
if (c == -1)
break;
@@ -168,6 +228,11 @@ static void parse_opts(int argc, char *argv[])
case 'R':
mode |= SPI_READY;
break;
+ case 'p':
+ input_tx = optarg;
+ break;
+ case 'v':
+ verbose = 1;
case '2':
mode |= SPI_TX_DUAL;
break;
@@ -191,6 +256,9 @@ int main(int argc, char *argv[])
{
int ret = 0;
int fd;
+ int size;
+ uint8_t *tx;
+ uint8_t *rx;
parse_opts(argc, argv);
@@ -235,7 +303,17 @@ int main(int argc, char *argv[])
printf("bits per word: %d\n", bits);
printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
- transfer(fd);
+ if (input_tx) {
+ size = strlen(input_tx+1);
+ tx = (uint8_t *)malloc(size);
+ rx = (uint8_t *)malloc(size);
+ size = unespcape((char *)tx, input_tx, size);
+ transfer(fd, tx, rx, size);
+ free(rx);
+ free(tx);
+ } else {
+ transfer(fd, default_tx, default_rx, sizeof(default_tx));
+ }
close(fd);
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/