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Petalinux SPI driver running but not connecting

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cuevas1208's picture
cuevas1208
Junior(0)
Petalinux SPI driver running but not connecting

I am having issues with my Petalinux SPI driver.
I have successfully tested on Xilinx SDK by using one of their spi templates and it worked just fine, but when I tried to set it up on Petalinux the programs runs but it can not connect.  It looks like Petalinux can not connect to the FPGA, what can I do to get it working?
This what I get after running the code:

root@pz-7020-2016-2:/bin# ./spidev_test -D /dev/spidev32766.0 --speed 10000000

spi mode: 0x0

bits per word: 8

max speed: 10000000 Hz (10000 KHz)

spidev spi32766.0: SPI transfer timed out

can't send spi message: Connection timed out

Aborted
I using PetalinuxTools16.2, and Vivado 16.2. 
Click here to see my dts files, and my spidev_test.c.
Block diagram:
 


Here are the steps I have done to set the SPI driver:

  1. I created a project:
    1. petalinux-create --type project --template zynq --name petalinux_pz_7020 --source pz_7020_2016_2.bsp
  2. I import my hardware:
    1. petalinux-config --get-hw-description vivado_Project/vivado_pz_7020.sdk --project petalinux_pz_7020
  3. Created an app
    1. petalinux-create -t apps --name spidev --template c
  4. I replace the content of the app spidev.c for the spidev_test.c attached to this email.
  5. Enable SPI support for your kernel:
    1. Navigate to Device Drivers->SPI support and make sure that Cadence SPI controller, Xilinx SPI controller command module, Xilinx Zynq QSPI controller, and User mode SPI device driver support are all enabled.
  6. Enabled the new app
    1. $ petalinux-config -c rootfs  
    2. Apps->spidev (Press Y to select the application)
  7. Build petalinux image
    1. petalinux-build
  8. Package the distribution
    1. petalinux-package  --boot --fsbl images/linux/zynq_fsbl.elf --fpga ../vivado_Project/impl_1/blockDesign_wrapper.bit --uboot --kernel --force
  9. Update Firmware
    1. run netboot  

Note:
In my petalinux project under /dev ia can see spidev32766.0, and under /bin I can see spidev

zedhed's picture
zedhed
Moderator(25)
RE: Petalinux SPI driver running but not connecting

Hi cuevas1208,

Can you please post the contents of your spidev.c Linux app here?

Regards,

-Kevin

cuevas1208's picture
cuevas1208
Junior(0)
spidev.c

/*
* SPI testing utility (using spidev driver)
*
* Copyright (c) 2007 MontaVista Software, Inc.
* Copyright (c) 2007 Anton Vorontsov <avorontsov@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
* Cross-compile with cross-gcc -I/path/to/cross-kernel/include
*/

#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

static void pabort(const char *s)
{
perror(s);
abort();
}

static const char *device = "/dev/spidev32765.0";
static uint32_t mode;
static uint8_t bits = 8;
static uint32_t speed = 500000;
static uint16_t delay;
static int verbose;

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 hex_dump(const void *src, size_t length, size_t line_size, char *prefix)
{
int i = 0;
const unsigned char *address = src;
const unsigned char *line = address;
unsigned char c;

printf("%s | ", prefix);
while (length-- > 0) {
printf("%02X ", *address++);
if (!(++i % line_size) || (length == 0 && i % line_size)) {
if (length == 0) {
while (i++ % line_size)
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);
}
}
}

/*
* Unescape - process hexadecimal escape character
* converts shell input "\x23" -> 0x23
*/
static int unescape(char *_dst, char *_src, size_t len)
{
int ret = 0;
char *src = _src;
char *dst = _dst;
unsigned int ch;

while (*src) {
if (*src == '\\' && *(src+1) == 'x') {
sscanf(src + 2, "%2x", &ch);
src += 4;
*dst++ = (unsigned char)ch;
} else {
*dst++ = *src++;
}
ret++;
}
return ret;
}

static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
{
int ret;

struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
.rx_buf = (unsigned long)rx,
.len = len,
.delay_usecs = delay,
.speed_hz = speed,
.bits_per_word = bits,
};

if (mode & SPI_TX_QUAD)
tr.tx_nbits = 4;
else if (mode & SPI_TX_DUAL)
tr.tx_nbits = 2;
if (mode & SPI_RX_QUAD)
tr.rx_nbits = 4;
else if (mode & SPI_RX_DUAL)
tr.rx_nbits = 2;
if (!(mode & SPI_LOOP)) {
if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
tr.rx_buf = 0;
else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
tr.tx_buf = 0;
}

ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
printf(device);
pabort("can't send spi message");

if (verbose)
hex_dump(tx, len, 32, "TX");
hex_dump(rx, len, 32, "RX");
}

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"
" -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"
" -4 --quad quad transfer\n");
exit(1);
}

static void parse_opts(int argc, char *argv[])
{
while (1) {
static const struct option lopts[] = {
{ "device", 1, 0, 'D' },
{ "speed", 1, 0, 's' },
{ "delay", 1, 0, 'd' },
{ "bpw", 1, 0, 'b' },
{ "loop", 0, 0, 'l' },
{ "cpha", 0, 0, 'H' },
{ "cpol", 0, 0, 'O' },
{ "lsb", 0, 0, 'L' },
{ "cs-high", 0, 0, 'C' },
{ "3wire", 0, 0, '3' },
{ "no-cs", 0, 0, 'N' },
{ "ready", 0, 0, 'R' },
{ "dual", 0, 0, '2' },
{ "verbose", 0, 0, 'v' },
{ "quad", 0, 0, '4' },
{ NULL, 0, 0, 0 },
};
int c;

c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL);

if (c == -1)
break;

switch (c) {
case 'D':
device = optarg;
break;
case 's':
speed = atoi(optarg);
break;
case 'd':
delay = atoi(optarg);
break;
case 'b':
bits = atoi(optarg);
break;
case 'l':
mode |= SPI_LOOP;
break;
case 'H':
mode |= SPI_CPHA;
break;
case 'O':
mode |= SPI_CPOL;
break;
case 'L':
mode |= SPI_LSB_FIRST;
break;
case 'C':
mode |= SPI_CS_HIGH;
break;
case '3':
mode |= SPI_3WIRE;
break;
case 'N':
mode |= SPI_NO_CS;
break;
case 'v':
verbose = 1;
break;
case 'R':
mode |= SPI_READY;
break;
case 'p':
input_tx = optarg;
break;
case '2':
mode |= SPI_TX_DUAL;
break;
case '4':
mode |= SPI_TX_QUAD;
break;
default:
print_usage(argv[0]);
break;
}
}
if (mode & SPI_LOOP) {
if (mode & SPI_TX_DUAL)
mode |= SPI_RX_DUAL;
if (mode & SPI_TX_QUAD)
mode |= SPI_RX_QUAD;
}
}

int main(int argc, char *argv[])
{
int ret = 0;
int fd;
uint8_t *tx;
uint8_t *rx;
int size;

parse_opts(argc, argv);

fd = open(device, O_RDWR);
if (fd < 0)
pabort("can't open device");

/*
* spi mode
*/
ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
if (ret == -1)
pabort("can't set spi mode");

ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
if (ret == -1)
pabort("can't get spi mode");

/*
* bits per word
*/
ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
if (ret == -1)
pabort("can't set bits per word");

ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
if (ret == -1)
pabort("can't get bits per word");

/*
* max speed hz
*/
ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
if (ret == -1)
pabort("can't set max speed hz");

ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
if (ret == -1)
pabort("can't get max speed hz");

printf("spi mode: 0x%x\n", mode);
printf("bits per word: %d\n", bits);
printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);

if (input_tx) {
size = strlen(input_tx+1);
tx = malloc(size);
rx = malloc(size);
size = unescape((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);

return ret;
}

 

valentino.ricci's picture
valentino.ricci
Junior(0)
The same Microzed

On Microzed: Petalinux 2016.3, linux 4.6 same issue.