blinking

[rapper.git] / bitbucket_lpc1768 / main.c

diff --git a/bitbucket_lpc1768/main.c b/bitbucket_lpc1768/main.c
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+/* 
+ * LED blinking example for the mbed LPC1768-based board.
+ *
+ * See also: http://bitbucket.org/jpc/lpc1768/
+ *
+ * Copyright (c) 2010 LoEE - Jakub Piotr Cłapa
+ * This program is released under the new BSD license.
+ */
+#include "CMSIS/LPC17xx.h"
+#include "io-pin.h"
+
+// For mbed-005.1
+#define LED1 P1+18
+#define LED2 P1+20
+#define LED3 P1+21
+#define LED4 P1+29
+
+// Helper macros
+#define LED_ON(i)  (pin_write (LED##i, 1))
+#define LED_OFF(i) (pin_write (LED##i, 0))
+
+volatile uint32_t current_time;
+
+void SysTick_Handler (void)
+{
+  current_time++;
+}
+
+void delay (uint32_t interval)
+{
+  uint32_t start = current_time;
+  while (current_time - start < interval);
+}
+
+int main (void)
+{
+  // Setup SysTick interrupts at 1kHz (1ms)
+  SysTick_Config (SystemCoreClock / 1000);
+
+  // Configure as output pins.
+  pin_dir (LED1, PIN_OUT);
+  pin_dir (LED2, PIN_OUT);
+  pin_dir (LED3, PIN_OUT);
+  pin_dir (LED4, PIN_OUT);
+
+  // Twinkle!
+  while(1) {
+    LED_OFF(1); delay (120); LED_ON(1);
+    LED_ON(2); delay (120); LED_OFF(2);
+    LED_ON(3); delay (120); LED_OFF(3);
+    LED_ON(4); delay (120); LED_OFF(4);
+    LED_ON(3); delay (120); LED_OFF(3);
+    LED_ON(2); delay (120); LED_OFF(2);
+  }
+}