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[NUCLEO_F103RB] Use HSI/LSI instead of HSE/LSE (board rev C constraint) #131

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Merged
merged 2 commits into from
Dec 17, 2013
Merged

[NUCLEO_F103RB] Use HSI/LSI instead of HSE/LSE (board rev C constraint) #131

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c84b8f9
[NUCLEO_F103RB] Use HSI/LSI instead of HSE/LSE
bcostm Dec 17, 2013
9702a13
Merge branch 'master' of https://github.com/mbedmicro/mbed
bcostm Dec 17, 2013
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4 changes: 2 additions & 2 deletions libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/system_stm32f10x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -105,14 +105,14 @@

#if defined (STM32F10X_LD_VL) || (defined STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
/* #define SYSCLK_FREQ_HSE HSE_VALUE */
#define SYSCLK_FREQ_24MHz 24000000
/* #define SYSCLK_FREQ_24MHz 24000000 */
#else
/* #define SYSCLK_FREQ_HSE HSE_VALUE */
/* #define SYSCLK_FREQ_24MHz 24000000 */
/* #define SYSCLK_FREQ_36MHz 36000000 */
/* #define SYSCLK_FREQ_48MHz 48000000 */
/* #define SYSCLK_FREQ_56MHz 56000000 */
#define SYSCLK_FREQ_72MHz 72000000
/* #define SYSCLK_FREQ_72MHz 72000000 */
#endif

/*!< Uncomment the following line if you need to use external SRAM mounted
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19 changes: 13 additions & 6 deletions libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c
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Expand Up @@ -24,21 +24,28 @@ void rtc_init(void) {

BKP_DeInit(); // Reset Backup Domain

// Uncomment these lines if you use the LSE
// Enable LSE and wait till it's ready
RCC_LSEConfig(RCC_LSE_ON);
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {}

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source
//RCC_LSEConfig(RCC_LSE_ON);
//while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {}
//RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source

// Uncomment these lines if you use the LSI
// Enable LSI and wait till it's ready
RCC_LSICmd(ENABLE);
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {}
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source

RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock

RTC_WaitForSynchro(); // Wait for RTC registers synchronization

RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished

// Set RTC period to 1 sec
// RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1)
RTC_SetPrescaler(32767);
// For LSE: prescaler = RTCCLK/RTC period = 32768Hz/1Hz = 32768
// For LSI: prescaler = RTCCLK/RTC period = 40000Hz/1Hz = 40000
RTC_SetPrescaler(39999);

RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished

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