170bdd104f
Large change that removes the duplicated MIT notice withe a spdx tag Signed-off-by: Thomas Ingleby <thomas.ingleby@intel.com>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* Author: Michael Ring <mail@michael-ring.org>
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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* Copyright (c) 2014 Intel Corporation.
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*
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* SPDX-License-Identifier: MIT
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*
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* Example usage: Display set of patterns on MAX7219 repeately.
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* Press Ctrl+C to exit
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*/
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/* standard headers */
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* mraa header */
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#include "mraa/spi.h"
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/* SPI declaration */
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#define SPI_BUS 0
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/* SPI frequency in Hz */
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#define SPI_FREQ 400000
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uint16_t pat[] = { 0x01aa, 0x0255, 0x03aa, 0x0455, 0x05aa, 0x0655, 0x07aa, 0x0855 };
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uint16_t pat_inv[] = { 0x0155, 0x02aa, 0x0355, 0x04aa, 0x0555, 0x06aa, 0x0755, 0x08aa };
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uint16_t pat_clear[] = { 0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800 };
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volatile sig_atomic_t flag = 1;
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void
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sig_handler(int signum)
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{
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if (signum == SIGINT) {
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fprintf(stdout, "Exiting...\n");
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flag = 0;
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}
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}
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int
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main(int argc, char** argv)
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{
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mraa_result_t status = MRAA_SUCCESS;
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mraa_spi_context spi;
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int i, j;
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/* initialize mraa for the platform (not needed most of the times) */
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mraa_init();
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//! [Interesting]
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/* initialize SPI bus */
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spi = mraa_spi_init(SPI_BUS);
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if (spi == NULL) {
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fprintf(stderr, "Failed to initialize SPI\n");
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mraa_deinit();
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return EXIT_FAILURE;
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}
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/* set SPI frequency */
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status = mraa_spi_frequency(spi, SPI_FREQ);
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if (status != MRAA_SUCCESS)
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goto err_exit;
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/* set big endian mode */
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status = mraa_spi_lsbmode(spi, 0);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* MAX7219/21 chip needs the data in word size */
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status = mraa_spi_bit_per_word(spi, 16);
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if (status != MRAA_SUCCESS) {
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fprintf(stdout, "Failed to set SPI Device to 16Bit mode\n");
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goto err_exit;
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}
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/* do not decode bits */
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mraa_spi_write_word(spi, 0x0900);
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/* brightness of LEDs */
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mraa_spi_write_word(spi, 0x0a05);
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/* show all scan lines */
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mraa_spi_write_word(spi, 0x0b07);
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/* set display on */
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mraa_spi_write_word(spi, 0x0c01);
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/* testmode off */
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mraa_spi_write_word(spi, 0x0f00);
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while (flag) {
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/* set display pattern */
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mraa_spi_write_buf_word(spi, pat, 16);
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sleep(2);
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/* set inverted display pattern */
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mraa_spi_write_buf_word(spi, pat_inv, 16);
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sleep(2);
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/* clear the LED's */
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mraa_spi_write_buf_word(spi, pat_clear, 16);
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/* cycle through all LED's */
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for (i = 1; i <= 8; i++) {
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for (j = 0; j < 8; j++) {
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mraa_spi_write_word(spi, (i << 8) + (1 << j));
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sleep(1);
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}
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mraa_spi_write_word(spi, i << 8);
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}
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}
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/* stop spi */
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mraa_spi_stop(spi);
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//! [Interesting]
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/* deinitialize mraa for the platform (not needed most of the times) */
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mraa_deinit();
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return EXIT_SUCCESS;
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err_exit:
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mraa_result_print(status);
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/* stop spi */
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mraa_spi_stop(spi);
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/* deinitialize mraa for the platform (not needed most of the times) */
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mraa_deinit();
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return EXIT_FAILURE;
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}
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