[STM32U3] 【STM32U385RG 测评】基础任务2 基于低功耗串口测试

根据评测任务此次测试需要用到低功耗串口我这里使用lpuart1做为测试口根据原理图他接到PA2、PA31、串口初始化static void MX_LPUART1_UART_Init(void){/* USER CODE BEGIN LPUART1_Init 0 *//* USER CODE END LPUART1_Init 0 *//* USER CODE BEGIN LPUART1_Init 1 *//* USER CODE END LPUART1_Init 1 */hlpuart1.Instance LPUART1;hlpuart1.Init.BaudRate 115200;hlpuart1.Init.WordLength UART_WORDLENGTH_8B;hlpuart1.Init.StopBits UART_STOPBITS_1;hlpuart1.Init.Parity UART_PARITY_NONE;hlpuart1.Init.Mode UART_MODE_TX_RX;hlpuart1.Init.HwFlowCtl UART_HWCONTROL_NONE;hlpuart1.Init.OneBitSampling UART_ONE_BIT_SAMPLE_DISABLE;hlpuart1.Init.ClockPrescaler UART_PRESCALER_DIV1;hlpuart1.AdvancedInit.AdvFeatureInit UART_ADVFEATURE_NO_INIT;hlpuart1.FifoMode UART_FIFOMODE_DISABLE;if (HAL_UART_Init(hlpuart1) ! HAL_OK){Error_Handler();}if (HAL_UARTEx_SetTxFifoThreshold(hlpuart1, UART_TXFIFO_THRESHOLD_1_8) ! HAL_OK){Error_Handler();}if (HAL_UARTEx_SetRxFifoThreshold(hlpuart1, UART_RXFIFO_THRESHOLD_1_8) ! HAL_OK){Error_Handler();}if (HAL_UARTEx_DisableFifoMode(hlpuart1) ! HAL_OK){Error_Handler();}/* USER CODE BEGIN LPUART1_Init 2 */#ifdef BOARD_IN_STOP_MODELPUART1_EXTI_ENABLE_IT();#endif /* BOARD_IN_STOP_MODE *//* USER CODE END LPUART1_Init 2 */}2、同时为了显示LED初始化led2复制BSP_LED_Init(LD2);3、配置低功耗时钟复制void SystemClock_Config_fromSTOP(void){RCC_ClkInitTypeDef RCC_ClkInitStruct {0};RCC_OscInitTypeDef RCC_OscInitStruct {0};uint32_t pFLatency 0;/* Get the Oscillators configuration from the internal RCC registers */HAL_RCC_GetOscConfig(RCC_OscInitStruct);/* Wake up on HSI, re-enable PLL with HSI as source *//* Oscillator configuration unchanged */RCC_OscInitStruct.OscillatorType RCC_OSCILLATORTYPE_HSI;RCC_OscInitStruct.HSIState RCC_HSI_ON;RCC_OscInitStruct.HSICalibrationValue RCC_HSICALIBRATION_DEFAULT;if (HAL_RCC_OscConfig(RCC_OscInitStruct) ! HAL_OK){Error_Handler();}/* Get the clock prescalers configuration from the internal RCC registers */HAL_RCC_GetClockConfig(RCC_ClkInitStruct, pFLatency);RCC_ClkInitStruct.ClockType RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2|RCC_CLOCKTYPE_PCLK3;RCC_ClkInitStruct.SYSCLKSource RCC_SYSCLKSOURCE_HSI;RCC_ClkInitStruct.AHBCLKDivider RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider RCC_HCLK_DIV1;RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1;RCC_ClkInitStruct.APB3CLKDivider RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, pFLatency) ! HAL_OK){Error_Handler();}}4、测试程序设计在主程序中首先延时2秒然后开启低功耗串口的接收中断然后进入低功耗模式关闭LD2当有串口数据接收后周期闪烁闪烁10次如果没有数据再次进入则再次进入低功耗模式。复制/* LD2 is on till stop mode */BSP_LED_On(LD2);/* wait for two seconds before test start */HAL_Delay(2000);/* Disable Debug during Stop mode */HAL_DBGMCU_DisableDBGStopMode();/* Enable MCU wake-up by LPUART */HAL_UARTEx_EnableStopMode(hlpuart1);/*##-1- Put UART peripheral in reception process ###########################*/if (HAL_UART_Receive_IT(hlpuart1, (uint8_t *)aRxBuffer, RXBUFFERSIZE) ! HAL_OK){Error_Handler();}/* about to enter STOP mode: switch off LD2 */BSP_LED_Off(LD2);/* enter STOP mode */HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);/* The board receives the message from the other board. Message reception wakes up the board. *//* Switch On LD2 */BSP_LED_On(LD2);/* At that point, MCU has been awoken: LD2 has been turned back on ; Wake Up based on RXNE flag successful */SystemClock_Config_fromSTOP();/* Disable MCU wake-up by LPUART */HAL_UARTEx_DisableStopMode(hlpuart1);#endif /* !BOARD_IN_STOP_MODE *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){BSP_LED_Off(LD2);HAL_Delay(500);BSP_LED_On(LD2);HAL_Delay(500);cnt;if(cnt 10){/* Disable Debug during Stop mode */HAL_DBGMCU_DisableDBGStopMode();/* Enable MCU wake-up by LPUART */HAL_UARTEx_EnableStopMode(hlpuart1);/*##-1- Put UART peripheral in reception process ###########################*/if (HAL_UART_Receive_IT(hlpuart1, (uint8_t *)aRxBuffer, RXBUFFERSIZE) ! HAL_OK){Error_Handler();}/* about to enter STOP mode: switch off LD2 */BSP_LED_Off(LD2);/* enter STOP mode */HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);/* The board receives the message from the other board. Message reception wakes up the board. *//* Switch On LD2 */BSP_LED_On(LD2);/* At that point, MCU has been awoken: LD2 has been turned back on ; Wake Up based on RXNE flag successful */SystemClock_Config_fromSTOP();/* Disable MCU wake-up by LPUART */HAL_UARTEx_DisableStopMode(hlpuart1);cnt 0;}/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */【测试】我使用微安表进行测试在正常工作时工作电流为1.1MA进入低功耗时电流为400uA使用串口发送数据后可以正常唤醒。---------------------作者lulugl链接https://bbs.21ic.com/icview-3481350-1-1.html?_dsign6d32beff来源21ic.com此文章已获得原创/原创奖标签著作权归21ic所有任何人未经允许禁止转载。