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Merge pull request #815 from toyowata/master 

Targets: LPC4337 - Fix RTC clock setting issue
pull/817/head
Martin Kojtal 2014-12-25 19:35:15 +01:00
parent ab46ea6cee 7b62e7d5d6
commit 2f63fa7d78
1 changed files with 13 additions and 3 deletions
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16
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c
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@ -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;
LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled
void rtc_init(void) {
// Return, if already enabled
if (LPC_RTC->CCR & 1)
return;
// 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) {