modify parallel epd run file

inkycal/display/drivers/parallel_drivers/bcm2835-1.68/examples/spi/spi.c

@@ -0,0 +1,56 @@
+// spi.c
+//
+// Example program for bcm2835 library
+// Shows how to interface with SPI to transfer a byte to and from an SPI device
+//
+// After installing bcm2835, you can build this 
+// with something like:
+// gcc -o spi spi.c -l bcm2835
+// sudo ./spi
+//
+// Or you can test it before installing with:
+// gcc -o spi -I ../../src ../../src/bcm2835.c spi.c
+// sudo ./spi
+//
+// Author: Mike McCauley
+// Copyright (C) 2012 Mike McCauley
+// $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $
+
+#include <bcm2835.h>
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+    // If you call this, it will not actually access the GPIO
+// Use for testing
+//        bcm2835_set_debug(1);
+
+    if (!bcm2835_init())
+    {
+      printf("bcm2835_init failed. Are you running as root??\n");
+      return 1;
+    }
+
+    if (!bcm2835_spi_begin())
+    {
+      printf("bcm2835_spi_begin failed. Are you running as root??\n");
+      return 1;
+    }
+    bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);      // The default
+    bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);                   // The default
+    bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_65536); // The default
+    bcm2835_spi_chipSelect(BCM2835_SPI_CS0);                      // The default
+    bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, LOW);      // the default
+    
+    // Send a byte to the slave and simultaneously read a byte back from the slave
+    // If you tie MISO to MOSI, you should read back what was sent
+    uint8_t send_data = 0x23;
+    uint8_t read_data = bcm2835_spi_transfer(send_data);
+    printf("Sent to SPI: 0x%02X. Read back from SPI: 0x%02X.\n", send_data, read_data);
+    if (send_data != read_data)
+      printf("Do you have the loopback from MOSI to MISO connected?\n");
+    bcm2835_spi_end();
+    bcm2835_close();
+    return 0;
+}
+