1 /* 2 * Author: Michael Ring <mail (at) michael-ring.org> 3 * Author: Thomas Ingleby <thomas.c.ingleby (at) intel.com> 4 * Copyright (c) 2014 Intel Corporation. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining 7 * a copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sublicense, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be 15 * included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 #include "mraa.h" 27 #include <unistd.h> 28 #include <stdint.h> 29 30 int 31 main(int argc, char** argv) 32 { 33 //! [Interesting] 34 mraa_spi_context spi; 35 spi = mraa_spi_init(1); 36 if (spi == NULL) { 37 printf("Initialization of spi failed, check syslog for details, exit...\n"); 38 exit(1); 39 } 40 41 printf("SPI initialised successfully\n"); 42 43 mraa_spi_frequency(spi, 400000); 44 mraa_spi_lsbmode(spi, 0); 45 46 // The MAX7219/21 Chip needs the data in word size 47 if (mraa_spi_bit_per_word(spi, 16) != MRAA_SUCCESS) { 48 printf("Could not set SPI Device to 16Bit mode, exit...\n"); 49 exit(1); 50 }; 51 52 mraa_spi_write_word(spi, 0x0900); // Do not decode bits 53 mraa_spi_write_word(spi, 0x0a05); // Brightness of LEDs 54 mraa_spi_write_word(spi, 0x0b07); // Show all Scan Lines 55 mraa_spi_write_word(spi, 0x0c01); // Display on 56 mraa_spi_write_word(spi, 0x0f00); // Testmode off 57 58 // Display Pattern on the display 59 uint16_t dataAA55[] = { 0x01aa, 0x0255, 0x03aa, 0x0455, 0x05aa, 0x0655, 0x07aa, 0x0855 }; 60 mraa_spi_write_buf_word(spi, dataAA55, 16); 61 62 sleep(2); 63 64 // Display inverted Pattern 65 uint16_t data55AA[] = { 0x0155, 0x02aa, 0x0355, 0x04aa, 0x0555, 0x06aa, 0x0755, 0x08aa }; 66 mraa_spi_write_buf_word(spi, data55AA, 16); 67 68 sleep(2); 69 70 // Clear the display 71 uint16_t data[] = { 0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800 }; 72 mraa_spi_write_buf_word(spi, data, 16); 73 74 int i; 75 int j; 76 // cycle through all LED's 77 for (i = 1; i <= 8; i++) { 78 for (j = 0; j < 8; j++) { 79 mraa_spi_write_word(spi, (i << 8) + (1 << j)); 80 sleep(1); 81 } 82 mraa_spi_write_word(spi, i << 8); 83 } 84 85 mraa_spi_stop(spi); 86 87 //! [Interesting] 88 } 89
