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hw/bsp/stm32l4: stabilize L412 USB clock

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This commit is contained in:
Zixun LI
2026-07-28 21:15:49 +02:00
parent a20cf74e6a
commit 8895e94b7f
1 changed files with 20 additions and 28 deletions
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48
hw/bsp/stm32l4/boards/stm32l412nucleo/board.h
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@ -64,9 +64,10 @@
* AHB Prescaler = 1
* APB1 Prescaler = 1
* APB2 Prescaler = 1
* MSI Frequency(Hz) = 8000000
* PLL_M = 1
* PLL_N = 10
* MSI Frequency(Hz) = 48000000
* LSE Frequency(Hz) = 32768
* PLL_M = 6
* PLL_N = 20
* PLL_Q = 2
* PLL_R = 2
* VDD(V) = 3.3
@ -78,29 +79,35 @@ static inline void board_clock_init(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_CRSInitTypeDef RCC_CRSInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/* HAL clock setup reconfigures its tick while MSI is the reset SYSCLK. */
HAL_InitTick((1UL << __NVIC_PRIO_BITS) - 1UL);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 10;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = 6;
RCC_OscInitStruct.PLL.PLLN = 20;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* Stabilize MSI against the on-board 32.768 kHz LSE crystal. */
HAL_RCCEx_EnableMSIPLLMode();
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
@ -112,24 +119,9 @@ static inline void board_clock_init(void)
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);
/** Enable the SYSCFG APB clock
*/
__HAL_RCC_CRS_CLK_ENABLE();
/** Configures CRS
*/
RCC_CRSInitStruct.Prescaler = RCC_CRS_SYNC_DIV1;
RCC_CRSInitStruct.Source = RCC_CRS_SYNC_SOURCE_USB;
RCC_CRSInitStruct.Polarity = RCC_CRS_SYNC_POLARITY_RISING;
RCC_CRSInitStruct.ReloadValue = __HAL_RCC_CRS_RELOADVALUE_CALCULATE(48000000,1000);
RCC_CRSInitStruct.ErrorLimitValue = 34;
RCC_CRSInitStruct.HSI48CalibrationValue = 32;
HAL_RCCEx_CRSConfig(&RCC_CRSInitStruct);
/* Select HSI48 output as USB clock source */
/* Use the same LSE-trimmed MSI source for USB and the CPU PLL. */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_MSI;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
/* Select PLL output as UART clock source */