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STM32: enable HSI/LSE clocks for LPUART #7498

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Merged
merged 1 commit into from
Jul 14, 2018
Merged

STM32: enable HSI/LSE clocks for LPUART #7498

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31 changes: 26 additions & 5 deletions targets/TARGET_STM/serial_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -379,11 +379,22 @@ void serial_baud(serial_t *obj, int baudrate)
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPUART1;
#if ((MBED_CONF_TARGET_LPUART_CLOCK_SOURCE) & USE_LPUART_CLK_LSE)
if (baudrate <= 9600 && __HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY)) {
PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
if (init_uart(obj) == HAL_OK) {
return;
if (baudrate <= 9600) {
// Enable LSE in case it is not already done
if (!__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY)) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSIState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
}
// Keep it to verify if HAL_RCC_OscConfig didn't exit with a timeout
if (__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY)) {
PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
if (init_uart(obj) == HAL_OK) {
return;
}
}
}
#endif
Expand All @@ -395,6 +406,16 @@ void serial_baud(serial_t *obj, int baudrate)
}
#endif
#if ((MBED_CONF_TARGET_LPUART_CLOCK_SOURCE) & USE_LPUART_CLK_HSI)
// Enable HSI in case it is not already done
if (!__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY)) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
}
// Keep it to verify if HAL_RCC_OscConfig didn't exit with a timeout
if (__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY)) {
PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_HSI;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
Expand Down