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stm: Increase timeout for RTC LSE startup; use backup regs.

This commit is contained in:
Damien George 2014-01-28 23:47:28 +00:00
parent e4b6a079b3
commit 217814cc63
2 changed files with 22 additions and 10 deletions
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2
stm/main.c
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@ -655,7 +655,7 @@ soft_reset:
rt_store_attr(m, MP_QSTR_mma_mode, (mp_obj_t)&pyb_mma_write_mode_obj);
#endif
rt_store_attr(m, MP_QSTR_hid, rt_make_function_n(1, pyb_hid_send_report));
#if MICROPY_HW_HAS_RTC
#if MICROPY_HW_ENABLE_RTC
rt_store_attr(m, MP_QSTR_time, rt_make_function_n(0, pyb_rtc_read));
#endif
#if MICROPY_HW_ENABLE_RNG

30
stm/rtc.c
View File

@ -8,8 +8,20 @@
#include "rtc.h"
void rtc_init(void) {
uint32_t rtc_clksrc;
uint32_t timeout = 1000000;
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
if (RTC_ReadBackupRegister(RTC_BKP_DR0) == 0x32F2) {
// RTC still alive, so don't re-init it
// wait for RTC APB register synchronisation
RTC_WaitForSynchro();
return;
}
uint32_t timeout = 10000000;
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
@ -26,7 +38,10 @@ void rtc_init(void) {
/* If LSE timed out, use LSI instead */
if (timeout == 0) {
/* Enable the LSI OSC */
// Disable the LSE OSC
RCC_LSEConfig(RCC_LSE_OFF);
// Enable the LSI OSC
RCC_LSICmd(ENABLE);
/* Wait till LSI is ready */
@ -34,15 +49,12 @@ void rtc_init(void) {
}
/* Use LSI as the RTC Clock Source */
rtc_clksrc = RCC_RTCCLKSource_LSI;
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
} else {
/* Use LSE as the RTC Clock Source */
rtc_clksrc = RCC_RTCCLKSource_LSE;
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
}
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(rtc_clksrc);
/* Note: LSI is around (32KHz), these dividers should work either way */
/* ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
uint32_t uwSynchPrediv = 0xFF;
@ -78,7 +90,7 @@ void rtc_init(void) {
RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
// Indicator for the RTC configuration
//RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
}
/******************************************************************************/