diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt index ff7c45a..6a3c496 100644 --- a/examples/CMakeLists.txt +++ b/examples/CMakeLists.txt @@ -10,6 +10,7 @@ add_executable (mmap-io2 mmap-io2.c) add_executable (blink_onboard blink_onboard.c) add_executable (uart_setup uart_setup.c) add_executable (gpio gpio.c) +add_executable (spi_max7219 spi_max7219.c) include_directories(${PROJECT_SOURCE_DIR}/api) @@ -25,6 +26,7 @@ target_link_libraries (mmap-io2 mraa) target_link_libraries (blink_onboard mraa) target_link_libraries (uart_setup mraa) target_link_libraries (gpio mraa) +target_link_libraries (spi_max7219 mraa) add_subdirectory (c++) diff --git a/examples/spi_max7219.c b/examples/spi_max7219.c new file mode 100644 index 0000000..16a818c --- /dev/null +++ b/examples/spi_max7219.c @@ -0,0 +1,87 @@ +/* + * Author: Michael Ring + * Author: Thomas Ingleby + * Copyright (c) 2014 Intel Corporation. + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include "mraa.h" +#include +#include + +int +main(int argc, char **argv) { +//! [Interesting] + mraa_spi_context spi; + spi = mraa_spi_init(1); + if (spi == NULL) { + printf("Initialization of spi failed, check syslog for details, exit...\n"); + exit(1); + } + + printf("SPI initialised successfully\n"); + + mraa_spi_frequency(spi, 400000); + mraa_spi_lsbmode(spi, 0); + + // The MAX7219/21 Chip needs the data in word size + if (mraa_spi_bit_per_word(spi, 16) != MRAA_SUCCESS) { + printf("Could not set SPI Device to 16Bit mode, exit...\n"); + exit(1); + }; + + mraa_spi_write_word(spi, 0x0900); // Do not decode bits + mraa_spi_write_word(spi, 0x0a05); // Brightness of LEDs + mraa_spi_write_word(spi, 0x0b07); // Show all Scan Lines + mraa_spi_write_word(spi, 0x0c01); // Display on + mraa_spi_write_word(spi, 0x0f00); // Testmode off + + // Display Pattern on the display + uint16_t dataAA55[] = {0x01aa, 0x0255, 0x03aa, 0x0455, 0x05aa, 0x0655, 0x07aa, 0x0855}; + mraa_spi_write_buf_word(spi, dataAA55, 16); + + sleep(2); + + // Display inverted Pattern + uint16_t data55AA[] = {0x0155, 0x02aa, 0x0355, 0x04aa, 0x0555, 0x06aa, 0x0755, 0x08aa}; + mraa_spi_write_buf_word(spi, data55AA, 16); + + sleep(2); + + // Clear the display + uint16_t data[] = {0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800}; + mraa_spi_write_buf_word(spi, data, 16); + + int i; + int j; + // cycle through all LED's + for (i = 1; i <= 8; i++) { + for (j = 0; j < 8; j++) { + mraa_spi_write_word(spi, (i << 8) + (1 << j)); + sleep(1); + } + mraa_spi_write_word(spi, i << 8); + } + + mraa_spi_stop(spi); + +//! [Interesting] +}