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test_spi.c
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/*
* c-periphery
* https://github.com/vsergeev/c-periphery
* License: MIT
*/
#include "test.h"
#include <stdlib.h>
#include <stdbool.h>
#include "../src/spi.h"
const char *device;
void test_arguments(void) {
spi_t *spi;
ptest();
/* Allocate SPI */
spi = spi_new();
passert(spi != NULL);
/* Invalid mode */
passert(spi_open(spi, device, 4, 1e6) == SPI_ERROR_ARG);
/* Invalid bit order */
passert(spi_open_advanced(spi, device, 0, 1e6, LSB_FIRST+1, 8, 0) == SPI_ERROR_ARG);
/* Free SPI */
spi_free(spi);
}
void test_open_config_close(void) {
spi_t *spi;
unsigned int mode;
spi_bit_order_t bit_order;
uint8_t bits_per_word;
uint32_t max_speed;
ptest();
/* Allocate SPI */
spi = spi_new();
passert(spi != NULL);
passert(spi_open(spi, device, 0, 100000) == 0);
/* Confirm bit_order = MSB first, bits_per_word = 8 */
passert(spi_get_bit_order(spi, &bit_order) == 0);
passert(bit_order == MSB_FIRST);
passert(spi_get_bits_per_word(spi, &bits_per_word) == 0);
passert(bits_per_word == 8);
/* Not going to try different bit order or bits per word, because not all
* SPI controllers support them */
/* Try modes 1,2,3,0 */
passert(spi_set_mode(spi, 1) == 0);
passert(spi_get_mode(spi, &mode) == 0);
passert(mode == 1);
passert(spi_set_mode(spi, 2) == 0);
passert(spi_get_mode(spi, &mode) == 0);
passert(mode == 2);
passert(spi_set_mode(spi, 3) == 0);
passert(spi_get_mode(spi, &mode) == 0);
passert(mode == 3);
passert(spi_set_mode(spi, 0) == 0);
passert(spi_get_mode(spi, &mode) == 0);
passert(mode == 0);
/* Try 100KHz, 500KHz, 1MHz */
passert(spi_set_max_speed(spi, 100000) == 0);
passert(spi_get_max_speed(spi, &max_speed) == 0);
passert(max_speed == 100000);
passert(spi_set_max_speed(spi, 500000) == 0);
passert(spi_get_max_speed(spi, &max_speed) == 0);
passert(max_speed == 500000);
passert(spi_set_max_speed(spi, 1000000) == 0);
passert(spi_get_max_speed(spi, &max_speed) == 0);
passert(max_speed == 1000000);
passert(spi_close(spi) == 0);
/* Free SPI */
spi_free(spi);
}
void test_loopback(void) {
spi_t *spi;
uint8_t buf[32];
unsigned int i;
ptest();
/* Allocate SPI */
spi = spi_new();
passert(spi != NULL);
passert(spi_open(spi, device, 0, 100000) == 0);
for (i = 0; i < sizeof(buf); i++)
buf[i] = i;
passert(spi_transfer(spi, buf, buf, sizeof(buf)) == 0);
for (i = 0; i < sizeof(buf); i++)
passert(buf[i] == i);
passert(spi_close(spi) == 0);
/* Free SPI */
spi_free(spi);
}
bool getc_yes(void) {
char buf[4];
if (fgets(buf, sizeof(buf), stdin) != NULL) {
return (buf[0] == 'y' || buf[0] == 'Y');
} else {
return false;
}
}
void test_interactive(void) {
char str[256];
spi_t *spi;
uint8_t buf[] = { 0x55, 0xaa, 0x0f, 0xf0 };
ptest();
/* Allocate SPI */
spi = spi_new();
passert(spi != NULL);
passert(spi_open(spi, device, 0, 100000) == 0);
printf("Starting interactive test. Get out your logic analyzer, buddy!\n");
printf("Press enter to continue...\n");
getc(stdin);
/* Check tostring */
passert(spi_tostring(spi, str, sizeof(str)) > 0);
printf("SPI description: %s\n", str);
printf("SPI description looks OK? y/n\n");
passert(getc_yes());
/* Mode 0 transfer */
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 100KHz, mode 0 occurred? y/n\n");
passert(getc_yes());
/* Mode 1 transfer */
passert(spi_set_mode(spi, 1) == 0);
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 100KHz, mode 1 occurred? y/n\n");
passert(getc_yes());
/* Mode 2 transfer */
passert(spi_set_mode(spi, 2) == 0);
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 100KHz, mode 2 occurred? y/n\n");
passert(getc_yes());
/* Mode 3 transfer */
passert(spi_set_mode(spi, 3) == 0);
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 100KHz, mode 3 occurred? y/n\n");
passert(getc_yes());
passert(spi_set_mode(spi, 0) == 0);
/* 500KHz transfer */
passert(spi_set_max_speed(spi, 500000) == 0);
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 500KHz, mode 0 occurred? y/n\n");
passert(getc_yes());
/* 1MHz transfer */
passert(spi_set_max_speed(spi, 1000000) == 0);
printf("Press enter to start transfer...");
getc(stdin);
passert(spi_transfer(spi, buf, NULL, sizeof(buf)) == 0);
printf("SPI data 0x55, 0xaa, 0x0f, 0xf0\n");
printf("SPI transfer speed <= 1MHz, mode 0 occurred? y/n\n");
passert(getc_yes());
passert(spi_close(spi) == 0);
/* Free SPI */
spi_free(spi);
}
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "Usage: %s <SPI device>\n\n", argv[0]);
fprintf(stderr, "[1/4] Arguments test: No requirements.\n");
fprintf(stderr, "[2/4] Open/close test: SPI device should be real.\n");
fprintf(stderr, "[3/4] Loopback test: SPI MISO and MOSI should be connected with a wire.\n");
fprintf(stderr, "[4/4] Interactive test: SPI MOSI, CLK, CS should be observed with an oscilloscope or logic analyzer.\n\n");
fprintf(stderr, "Hint: for Raspberry Pi 3, enable SPI0 with:\n");
fprintf(stderr, " $ echo \"dtparam=spi=on\" | sudo tee -a /boot/config.txt\n");
fprintf(stderr, " $ sudo reboot\n");
fprintf(stderr, "Use pins SPI0 MOSI (header pin 19), SPI0 MISO (header pin 21), SPI0 SCLK (header pin 23),\n");
fprintf(stderr, "connect a loopback between MOSI and MISO, and run this test with:\n");
fprintf(stderr, " %s /dev/spidev0.0\n\n", argv[0]);
exit(1);
}
device = argv[1];
test_arguments();
printf(" " STR_OK " Arguments test passed.\n\n");
test_open_config_close();
printf(" " STR_OK " Open/close test passed.\n\n");
test_loopback();
printf(" " STR_OK " Loopback test passed.\n\n");
test_interactive();
printf(" " STR_OK " Interactive test passed.\n\n");
printf("All tests passed!\n");
return 0;
}