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lm4f: Make miniblink example more readable, by defining RGB pins 

Instead of setting and clearing RGB pins by PINx constants, define more readable
constants such as RGB_RED, and RGB_PORT.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Alexandru Gagniuc 2013-01-08 22:18:53 -06:00
parent 7957cffaa3
commit 4b2d9aca7b
1 changed files with 43 additions and 35 deletions
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78
examples/lm4f/stellaris-ek-lm4f120xl/miniblink/miniblink.c
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@ -2,7 +2,7 @@
* This file is part of the libopencm3 project.
*
* Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
* Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
@ -30,62 +30,70 @@
#include <libopencm3/lm4f/systemcontrol.h>
#include <libopencm3/lm4f/gpio.h>
void gpio_setup(void)
{
SYSCTL_RCGCGPIO |= 0x20; /* Enable GPIOF in run mode. */
const u32 outpins = ((1<<3) | (1<<2) | (1<<1));
/* This is how the RGB LED is connected on the stellaris launchpad */
#define RGB_PORT GPIOF
enum {
LED_R = GPIO1,
LED_G = GPIO3,
LED_B = GPIO2,
};
GPIO_DIR(GPIOF) |= outpins; /* Configure outputs. */
GPIO_DEN(GPIOF) |= outpins; /* Enable digital function on outputs. */
/*
* GPIO setup:
* Enable the pins driving the RGB LED as outputs.
*/
static void gpio_setup(void)
{
/*
* Configure GPIOF
* This port is used to control the RGB LED
*/
periph_clock_enable(RCC_GPIOF);
const u32 outpins = (LED_R | LED_G | LED_B);
GPIO_DIR(RGB_PORT) |= outpins; /* Configure outputs. */
GPIO_DEN(RGB_PORT) |= outpins; /* Enable digital function on outputs. */
}
#define FLASH_DELAY 800000
static void delay(void)
{
int i;
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
}
int main(void)
{
int i;
gpio_setup();
/* Blink STATUS LED (PF0) on the board. */
/* Blink each color of the RGB LED in order. */
while (1) {
/*
* Flash the Red diode
*/
gpio_set(GPIOF, GPIO1);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_clear(GPIOF, GPIO1);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_set(RGB_PORT, LED_R);
delay(); /* Wait a bit. */
gpio_clear(RGB_PORT, LED_R);
delay(); /* Wait a bit. */
/*
* Flash the Green diode
*/
gpio_set(GPIOF, GPIO3);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_clear(GPIOF, GPIO3);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_set(RGB_PORT, LED_G);
delay(); /* Wait a bit. */
gpio_clear(RGB_PORT, LED_G);
delay(); /* Wait a bit. */
/*
* Flash the Blue diode
*/
gpio_set(GPIOF, GPIO2);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_clear(GPIOF, GPIO2);
for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
__asm__("nop");
gpio_set(RGB_PORT, LED_B);
delay(); /* Wait a bit. */
gpio_clear(RGB_PORT, LED_B);
delay(); /* Wait a bit. */
}
return 0;