前段时间做了一下IO的测试，至少证明环境搭建是没有问题的，今天来测试一下我们LPUART，本来是打算用例程然后外加串口来进行测试的，但是现在少了一个外接的串口，我查了一下原理图，发现是接的是PA2和PA3，这个正好也是LPUART1的复用的引脚。
只要硬件支持了，就支持修改映射就行了，在此之前，我们需要修改Hall的配置，开启LPUART和LPTIM的使能
完成了之后我们就自己建立工程，
然后就是LPUART的初始化程序
具体的代码如下：
- #include "LP_UART.h"
- UART_HandleTypeDef LP_UART1;
-
- void LP_UART_Init(void)
- {
- __HAL_RCC_LPUART1_CLK_ENABLE();
- __HAL_RCC_GPIOA_CLK_ENABLE();
-
- //--设置复用---
- GPIO_InitTypeDef gpio_init_structure;
- /* Configure USART Tx as alternate function */
- gpio_init_structure.Pin = GPIO_PIN_2;
- gpio_init_structure.Mode = GPIO_MODE_AF_PP;
- gpio_init_structure.Speed = GPIO_SPEED_FREQ_HIGH;
- gpio_init_structure.Pull = GPIO_PULLUP;
- gpio_init_structure.Alternate = GPIO_AF8_LPUART1;
- HAL_GPIO_Init(GPIOA, &gpio_init_structure);
- /* Configure USART Rx as alternate function */
- gpio_init_structure.Pin = GPIO_PIN_3;
- gpio_init_structure.Mode = GPIO_MODE_AF_PP;
- gpio_init_structure.Alternate = GPIO_AF8_LPUART1;
- HAL_GPIO_Init(GPIOA, &gpio_init_structure);
-
-
-
- LP_UART1.Instance = LPUART1;
- LP_UART1.Init.BaudRate = 115200;
- LP_UART1.Init.WordLength = UART_WORDLENGTH_8B;
- LP_UART1.Init.StopBits = UART_STOPBITS_1;
- LP_UART1.Init.Parity = UART_PARITY_NONE;
- LP_UART1.Init.Mode = UART_MODE_TX_RX;
- LP_UART1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
- LP_UART1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
- LP_UART1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
- LP_UART1.FifoMode = UART_FIFOMODE_DISABLE;
- if (HAL_UART_Init(&LP_UART1) != HAL_OK)
- {
- }
- if (HAL_UARTEx_SetTxFifoThreshold(&LP_UART1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
- {
- }
- if (HAL_UARTEx_SetRxFifoThreshold(&LP_UART1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
- {
- }
- if (HAL_UARTEx_DisableFifoMode(&LP_UART1) != HAL_OK)
- {
- }
- }
- void LP_UART_SendData(unsigned char *Data,unsigned int Len)
- {
- HAL_UART_Transmit(&LP_UART1,Data,Len,200);
- }
- int main(void)
- {
- HAL_Init();
- SystemClock_Config();
- __HAL_RCC_GPIOA_CLK_ENABLE();
- /* -2- Configure IO in output push-pull mode to drive external LEDs */
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_InitStruct.Pull = GPIO_NOPULL;
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
- GPIO_InitStruct.Pin = GPIO_PIN_5;
- HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
- LP_UART_Init();
- while (1)
- {
- HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
- HAL_Delay(500);
- LP_UART_SendData("This is LPUART Demo!\r\n",22);
- }
- /* USER CODE END 3 */<img src="https://bbs.21ic.com/forum.php?mod=image&aid=2246468&size=300x300&key=65d009f6634f4b5c&nocache=yes&type=fixnone" border="0" aid="attachimg_2246468" alt="">
- }
好了，我们来看看实际效果
这次的测试就到这里，LPUART的代码欢迎大家验证指教。
| 
楼主
