modify parallel epd run file

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

@@ -0,0 +1,66 @@
+// pwm.c
+//
+// Example program for bcm2835 library
+// Shows how to use PWM to control GPIO pins
+//
+// After installing bcm2835, you can build this 
+// with something like:
+// gcc -o pwm pwm.c -l bcm2835 
+// sudo ./pwm
+//
+// Or you can test it before installing with:
+// gcc -o pwm -I ../../src ../../src/bcm2835.c pwm.c
+// sudo ./pwm
+//
+// Connect an LED between GPIO18 (pin 12) and GND to observe the LED changing in brightness
+//
+// Author: Mike McCauley
+// Copyright (C) 2013 Mike McCauley
+// $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $
+
+#include <bcm2835.h>
+#include <stdio.h>
+
+// PWM output on RPi Plug P1 pin 12 (which is GPIO pin 18)
+// in alt fun 5.
+// Note that this is the _only_ PWM pin available on the RPi IO headers
+#define PIN RPI_GPIO_P1_12
+// and it is controlled by PWM channel 0
+#define PWM_CHANNEL 0
+// This controls the max range of the PWM signal
+#define RANGE 1024
+
+int main(int argc, char **argv)
+{
+    if (!bcm2835_init())
+	return 1;
+
+    // Set the output pin to Alt Fun 5, to allow PWM channel 0 to be output there
+    bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_ALT5);
+
+    // Clock divider is set to 16.
+    // With a divider of 16 and a RANGE of 1024, in MARKSPACE mode,
+    // the pulse repetition frequency will be
+    // 1.2MHz/1024 = 1171.875Hz, suitable for driving a DC motor with PWM
+    bcm2835_pwm_set_clock(BCM2835_PWM_CLOCK_DIVIDER_16);
+    bcm2835_pwm_set_mode(PWM_CHANNEL, 1, 1);
+    bcm2835_pwm_set_range(PWM_CHANNEL, RANGE);
+
+    // Vary the PWM m/s ratio between 1/RANGE and (RANGE-1)/RANGE
+    // over the course of a a few seconds
+    int direction = 1; // 1 is increase, -1 is decrease
+    int data = 1;
+    while (1)
+    {
+	if (data == 1)
+	    direction = 1;   // Switch to increasing
+	else if (data == RANGE-1)
+	    direction = -1;  // Switch to decreasing
+	data += direction;
+	bcm2835_pwm_set_data(PWM_CHANNEL, data);
+	bcm2835_delay(1);
+    }
+
+    bcm2835_close();
+    return 0;
+}