lzbp li / mbed-src

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Diff: targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c

Revision:
441:d2c15dda23c1
Parent:
20:4263a77256ae
diff -r 8a0b45cd594f -r d2c15dda23c1 targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c
--- a/targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c	Tue Dec 16 08:15:08 2014 +0000
+++ b/targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c	Tue Jan 06 16:15:36 2015 +0000
@@ -35,10 +35,20 @@
  * The RTC may already be running, so we should set it up
  * without impacting if it is the case
  */
+
 void rtc_init(void) {
-    LPC_RTC->CCR = 0x00;
+    // Return, if already enabled
+    if (LPC_RTC->CCR & 1)
+        return;
 
-    LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled
+    // Enable 1kHz output of 32kHz oscillator
+    LPC_CREG->CREG0 &= ~((1 << 3) | (1 << 2));
+    LPC_CREG->CREG0 |= (0x03 << 6) | (1 << 1) | (1 << 0);
+
+    // Enable RTC
+    do {
+        LPC_RTC->CCR |= 1 << 0;
+    } while ((LPC_RTC->CCR & 1) == 0);
 }
 
 void rtc_free(void) {