examples/spi_max7219.c: Example for 16bit wide convenience functions

Signed-off-by: Michael Ring <mail@michael-ring.org> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
2015-02-14 18:51:56 +01:00
parent 921e27ac22
commit ffe40033d4
2 changed files with 89 additions and 0 deletions
--- a/examples/spi_max7219.c
+++ b/examples/spi_max7219.c
@@ -0,0 +1,87 @@
+/*
+ * Author: Michael Ring <mail@michael-ring.org>
+ * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
+ * 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 <unistd.h>
+#include <stdint.h>
+
+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]
+}