06359e39cd
Some compilers are raising an error if no value is returned in main. Add a return 0 in spi_max7219.c main to quiet them. Signed-off-by: Cédric Bosdonnat <cbosdonnat@suse.com> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
90 lines
2.9 KiB
C
90 lines
2.9 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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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "mraa.h"
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#include <unistd.h>
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#include <stdint.h>
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int
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main(int argc, char** argv)
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{
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//! [Interesting]
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mraa_spi_context spi;
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spi = mraa_spi_init(1);
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if (spi == NULL) {
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printf("Initialization of spi failed, check syslog for details, exit...\n");
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exit(1);
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}
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printf("SPI initialised successfully\n");
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mraa_spi_frequency(spi, 400000);
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mraa_spi_lsbmode(spi, 0);
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// The MAX7219/21 Chip needs the data in word size
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if (mraa_spi_bit_per_word(spi, 16) != MRAA_SUCCESS) {
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printf("Could not set SPI Device to 16Bit mode, exit...\n");
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exit(1);
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};
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mraa_spi_write_word(spi, 0x0900); // Do not decode bits
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mraa_spi_write_word(spi, 0x0a05); // Brightness of LEDs
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mraa_spi_write_word(spi, 0x0b07); // Show all Scan Lines
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mraa_spi_write_word(spi, 0x0c01); // Display on
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mraa_spi_write_word(spi, 0x0f00); // Testmode off
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// Display Pattern on the display
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uint16_t dataAA55[] = { 0x01aa, 0x0255, 0x03aa, 0x0455, 0x05aa, 0x0655, 0x07aa, 0x0855 };
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mraa_spi_write_buf_word(spi, dataAA55, 16);
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sleep(2);
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// Display inverted Pattern
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uint16_t data55AA[] = { 0x0155, 0x02aa, 0x0355, 0x04aa, 0x0555, 0x06aa, 0x0755, 0x08aa };
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mraa_spi_write_buf_word(spi, data55AA, 16);
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sleep(2);
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// Clear the display
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uint16_t data[] = { 0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800 };
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mraa_spi_write_buf_word(spi, data, 16);
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int i;
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int j;
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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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mraa_spi_stop(spi);
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//! [Interesting]
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return 0;
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}
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