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RIOT/tests/periph_spi/main.c

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/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Application for testing low-level SPI driver implementations
*
* This implementation covers both, master and slave configurations.
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "xtimer.h"
#include "shell.h"
#include "periph/spi.h"
/**
* @brief Some parameters used for benchmarking
*/
#define BENCH_REDOS (1000)
#define BENCH_SMALL (2)
#define BENCH_LARGE (100)
#define BENCH_PAYLOAD ('b')
#define BENCH_REGADDR (0x23)
#define BUF_SIZE (512U)
/**
* @brief Benchmark buffers
*/
static uint8_t bench_wbuf[BENCH_LARGE];
static uint8_t bench_rbuf[BENCH_LARGE];
/**
* @brief Generic buffer used for receiving
*/
static uint8_t buf[BUF_SIZE];
static struct {
spi_t dev;
spi_mode_t mode;
spi_clk_t clk;
spi_cs_t cs;
} spiconf;
void print_bytes(char* title, uint8_t* data, size_t len)
{
printf("%4s\n", title);
for (size_t i = 0; i < len; i++) {
printf(" %2i ", (int)i);
}
printf("\n ");
for (size_t i = 0; i < len; i++) {
printf(" 0x%02x", (int)data[i]);
}
printf("\n ");
for (size_t i = 0; i < len; i++) {
if (data[i] < ' ' || data[i] > '~') {
printf(" ?? ");
}
else {
printf(" %c ", (char)data[i]);
}
}
printf("\n\n");
}
int cmd_init(int argc, char **argv)
{
int dev, mode, clk, port, pin, tmp;
if (argc < 5) {
printf("usage: %s <dev> <mode> <clk> <cs port> <cs pin>\n", argv[0]);
puts("\tdev:");
for (int i = 0; i < (int)SPI_NUMOF; i++) {
printf("\t\t%i: SPI_DEV(%i)\n", i, i);
}
puts("\tmode:");
puts("\t\t0: POL:0, PHASE:0 - on first rising edge");
puts("\t\t1: POL:0, PHASE:1 - on second rising edge");
puts("\t\t2: POL:1, PHASE:0 - on first falling edge");
puts("\t\t3: POL:1, PHASE:1 - on second falling edge");
puts("\tclk:");
puts("\t\t0: 100 KHz");
puts("\t\t1: 400 KHz");
puts("\t\t2: 1 MHz");
puts("\t\t3: 5 MHz");
puts("\t\t4: 10 MHz");
puts("\tcs port:");
puts("\t\tPort of the CS pin, set to -1 for hardware chip select");
puts("\tcs pin:");
puts("\t\tPin used for chip select. If hardware chip select is enabled,\n"
"\t\tthis value specifies the internal HWCS line");
return 1;
}
/* parse the given SPI device */
dev = atoi(argv[1]);
if (dev < 0 || dev >= SPI_NUMOF) {
puts("error: invalid SPI device specified");
return 1;
}
spiconf.dev = SPI_DEV(dev);
/* parse the SPI mode */
mode = atoi(argv[2]);
switch (mode) {
case 0: spiconf.mode = SPI_MODE_0; break;
case 1: spiconf.mode = SPI_MODE_1; break;
case 2: spiconf.mode = SPI_MODE_2; break;
case 3: spiconf.mode = SPI_MODE_3; break;
default:
puts("error: invalid SPI mode specified");
return 1;
}
/* parse the targeted clock speed */
clk = atoi(argv[3]);
switch (clk) {
case 0: spiconf.clk = SPI_CLK_100KHZ; break;
case 1: spiconf.clk = SPI_CLK_400KHZ; break;
case 2: spiconf.clk = SPI_CLK_1MHZ; break;
case 3: spiconf.clk = SPI_CLK_5MHZ; break;
case 4: spiconf.clk = SPI_CLK_10MHZ; break;
default:
puts("error: invalid bus speed specified");
return 1;
}
/* parse chip select port and pin */
port = atoi(argv[4]);
pin = atoi(argv[5]);
if (pin < 0 || port < -1) {
puts("error: invalid CS port/pin combination specified");
}
if (port == -1) { /* hardware chip select line */
spiconf.cs = SPI_HWCS(pin);
}
else {
spiconf.cs = (spi_cs_t)GPIO_PIN(port, pin);
}
/* test setup */
tmp = spi_init_cs(spiconf.dev, spiconf.cs);
if (tmp != SPI_OK) {
puts("error: unable to initialize the given chip select line");
return 1;
}
tmp = spi_acquire(spiconf.dev, spiconf.cs, spiconf.mode, spiconf.clk);
if (tmp == SPI_NOMODE) {
puts("error: given SPI mode is not supported");
return 1;
}
else if (tmp == SPI_NOCLK) {
puts("error: targeted clock speed is not supported");
return 1;
}
else if (tmp != SPI_OK) {
puts("error: unable to acquire bus with given parameters");
return 1;
}
spi_release(spiconf.dev);
printf("SPI_DEV(%i) initialized: mode: %i, clk: %i, cs_port: %i, cs_pin: %i\n",
dev, mode, clk, port, pin);
return 0;
}
int cmd_transfer(int argc, char **argv)
{
size_t len;
if (argc < 2) {
printf("usage: %s <data>\n", argv[0]);
return 1;
}
if (spiconf.dev == SPI_UNDEF) {
puts("error: SPI is not initialized, please initialize bus first");
return 1;
}
/* get bus access */
if (spi_acquire(spiconf.dev, spiconf.cs,
spiconf.mode, spiconf.clk) != SPI_OK) {
puts("error: unable to acquire the SPI bus");
return 1;
}
/* transfer data */
len = strlen(argv[1]);
memset(buf, 0, sizeof(buf));
spi_transfer_bytes(spiconf.dev, spiconf.cs, false, argv[1], buf, len);
/* release the bus */
spi_release(spiconf.dev);
/* print results */
print_bytes("Sent bytes", (uint8_t *)argv[1], len);
print_bytes("Received bytes", buf, len);
return 0;
}
int cmd_bench(int argc, char **argv)
{
uint32_t start, stop;
uint32_t sum = 0;
uint8_t in;
uint8_t out = (uint8_t)BENCH_PAYLOAD;
if (spiconf.dev == SPI_UNDEF) {
puts("error: SPI is not initialized, please initialize bus first");
return 1;
}
/* prepare buffer */
memset(bench_wbuf, BENCH_PAYLOAD, BENCH_LARGE);
/* get access to the bus */
if (spi_acquire(spiconf.dev, spiconf.cs,
spiconf.mode, spiconf.clk) != SPI_OK) {
puts("error: unable to acquire the SPI bus");
return 1;
}
puts("### Running some benchmarks, all values in [us] ###\n");
/* 1 - write 1000 times 1 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
in = spi_transfer_byte(spiconf.dev, spiconf.cs, false, out);
(void)in;
}
stop = xtimer_now_usec();
printf(" 1 - write %i times %i byte:", BENCH_REDOS, 1);
printf("\t\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 2 - write 1000 times 2 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
bench_wbuf, NULL, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf(" 2 - write %i times %i byte:", BENCH_REDOS, BENCH_SMALL);
printf("\t\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 3 - write 1000 times 100 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
bench_wbuf, NULL, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf(" 3 - write %i times %i byte:", BENCH_REDOS, BENCH_LARGE);
printf("\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 4 - write 1000 times 1 byte to register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
in = spi_transfer_reg(spiconf.dev, spiconf.cs, BENCH_REGADDR, out);
(void)in;
}
stop = xtimer_now_usec();
printf(" 4 - write %i times %i byte to register:", BENCH_REDOS, 1);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 5 - write 1000 times 2 byte to register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
bench_wbuf, NULL, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf(" 5 - write %i times %i byte to register:", BENCH_REDOS, BENCH_SMALL);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 6 - write 1000 times 100 byte to register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
bench_wbuf, NULL, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf(" 6 - write %i times %i byte to register:", BENCH_REDOS, BENCH_LARGE);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 7 - read 1000 times 2 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
NULL, bench_rbuf, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf(" 7 - read %i times %i byte:", BENCH_REDOS, BENCH_SMALL);
printf("\t\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 8 - read 1000 times 100 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
NULL, bench_rbuf, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf(" 8 - read %i times %i byte:", BENCH_REDOS, BENCH_LARGE);
printf("\t\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 9 - read 1000 times 2 byte from register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
NULL, bench_rbuf, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf(" 9 - read %i times %i byte from register:", BENCH_REDOS, BENCH_SMALL);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 10 - read 1000 times 100 byte from register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
NULL, bench_rbuf, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf("10 - read %i times %i byte from register:", BENCH_REDOS, BENCH_LARGE);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 11 - transfer 1000 times 2 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
bench_wbuf, bench_rbuf, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf("11 - transfer %i times %i byte:", BENCH_REDOS, BENCH_SMALL);
printf("\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 12 - transfer 1000 times 100 byte */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_bytes(spiconf.dev, spiconf.cs, false,
bench_wbuf, bench_rbuf, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf("12 - transfer %i times %i byte:", BENCH_REDOS, BENCH_LARGE);
printf("\t\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 13 - transfer 1000 times 2 byte from/to register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
bench_wbuf, bench_rbuf, BENCH_SMALL);
}
stop = xtimer_now_usec();
printf("13 - transfer %i times %i byte to register:", BENCH_REDOS, BENCH_SMALL);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
/* 14 - transfer 1000 times 100 byte from/to register */
start = xtimer_now_usec();
for (int i = 0; i < BENCH_REDOS; i++) {
spi_transfer_regs(spiconf.dev, spiconf.cs, BENCH_REGADDR,
bench_wbuf, bench_rbuf, BENCH_LARGE);
}
stop = xtimer_now_usec();
printf("14 - transfer %i times %i byte to register:", BENCH_REDOS, BENCH_LARGE);
printf("\t%i\n", (int)(stop - start));
sum += (stop - start);
printf("-- - SUM:\t\t\t\t\t%i\n", (int)sum);
spi_release(spiconf.dev);
puts("\n### All runs complete ###");
return 0;
}
static const shell_command_t shell_commands[] = {
{ "init", "Setup a particular SPI configuration", cmd_init },
{ "send", "Transfer string to slave", cmd_transfer },
{ "bench", "Runs some benchmarks", cmd_bench },
{ NULL, NULL, NULL }
};
int main(void)
{
puts("Manual SPI peripheral driver test");
puts("Refer to the README.md file for more information.\n");
printf("There are %i SPI devices configured for your platform.\n",
(int)SPI_NUMOF);
/* reset local SPI configuration */
spiconf.dev = SPI_UNDEF;
/* run the shell */
char line_buf[SHELL_DEFAULT_BUFSIZE];
shell_run(shell_commands, line_buf, SHELL_DEFAULT_BUFSIZE);
return 0;
}