[CW32L052 Review] Study Notes 07 (Control the LED light switch by sending commands through the serial port)

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[CW32L052 Review] Study Notes 07 (Control the LED light switch by sending commands through the serial port) [Copy link]

 

### 12.1: Hardware Design View the schematic design:  From the schematic diagram, we can see that the MCU uses the PA15 and PC10 pins to control LED1 and LED2 respectively. When the MCU pin is high, the LED is on, and when the MCU pin is low, the LED is off. ### 12.2: Software Design Use the MCU to control the switch of the LED and the switch of the relay. The control of these switch quantities uses the output function of the MCU. First, configure the GPIO port information of the LED. ```c //PA15, PC10 void bsp_InitLedHard(void) { GPIO_InitTypeDef GPIO_InitStruct; __RCC_GPIOC_CLK_ENABLE(); __RCC_GPIOA_CLK_ENABLE(); GPIO_InitStruct.IT = GPIO_IT_NONE; //LED1 LED2 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT _PP; GPIO_InitStruct.Pins = GPIO_PIN_15; GPIO_Init(CW_GPIOA, &GPIO_InitStruct); GPIO_WritePin(CW_GPIOA,GPIO_PIN_15,GPIO_Pin_RESET); GPIO_InitStruct.Pins = GPIO_PIN_10; GPIO_Init(CW_GPIOC, &GPIO_InitStruct); GPIO_WritePin(CW_GPIOC,GPIO_PIN_10,GPIO_Pin_RESET); } ``` During initialization, the default control LED light is off, and GPIO_WritePin is used to control the pin level state; in order to use the LED to control the switch, we use serial communication here, sending "on" means the LED light is on, and sending "off" means the LED light is off. Write a serial communication function to parse whether the command sent by the serial port is a control command, and make the LED light respond. ```C void UART2_Recv_Task(void *patameter) { patameter =patameter; uint8_t dataLen=0; dataLen = RxBuffer2.m_putIdx-RxBuffer2.m_getIdx; /*When the serial port has data*/ if(dataLen!=0) { if(strstr((const char*)RxBuffer2.m_entry,"on")) { GPIO_WritePin(CW_GPIOA,GPIO_PIN_15,GPIO_Pin_SET); } else if(strstr((const char*)RxBuffer2.m_entry,"off")) { GPIO_WritePin(CW_GPIOA,GPIO_PIN_15,GPIO_Pin_RESET); } else { //TODO } USART2_Clear(); } } ``` ### 12.3: Result verification The serial port sends "on", and the serial port debugging screenshot is as follows:  The serial port sends "off", and the serial port debugging screenshot is as follows:  For the LED light switch control effect, please check the B station video: https://www.bilibili.com/video/BV1Hu411N7Fi/?pop_share=1

hulin4578

Very good, very good

hulin4578

Very good, very good