TA的每日心情 | 慵懒 2024-7-25 20:48 |
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签到天数: 773 天 连续签到: 1 天 [LV.10]以坛为家III
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上次玩了一下N32G430开发板点亮了led灯,这次就试试串口。实现串口的发送接收。然后尝试移植了nr_micro_shell。
移植shell首先要把串口发送接收搞定。
下面就是我使用USART1测试,初始化USART1如下:使用中断接收串口数据,这样就不会丢失数据了。
- void uart_init(void)
- {
- GPIO_InitType GPIO_InitStructure;
- USART_InitType USART_InitStructure;
- NVIC_InitType NVIC_InitStructure;
- RCC_AHB_Peripheral_Clock_Enable(RCC_AHB_PERIPH_GPIOA);
- RCC_APB2_Peripheral_Clock_Enable(RCC_APB2_PERIPH_AFIO | RCC_APB2_PERIPH_USART1);
- GPIO_Structure_Initialize(&GPIO_InitStructure);
- GPIO_InitStructure.Pin = GPIO_PIN_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF_PP;
- GPIO_InitStructure.GPIO_Alternate = GPIO_AF5_USART1;
- GPIO_Peripheral_Initialize(GPIOA, &GPIO_InitStructure);
- GPIO_InitStructure.Pin = GPIO_PIN_10;
- GPIO_InitStructure.GPIO_Alternate = GPIO_AF5_USART1;
- GPIO_Peripheral_Initialize(GPIOA, &GPIO_InitStructure);
- USART_InitStructure.BaudRate = 115200;
- USART_InitStructure.WordLength = USART_WL_8B;
- USART_InitStructure.StopBits = USART_STPB_1;
- USART_InitStructure.Parity = USART_PE_NO;
- USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
- USART_InitStructure.Mode = USART_MODE_TX | USART_MODE_RX;
- /* init uart */
- USART_Initializes(USART1, &USART_InitStructure);
- /* enable uart */
- USART_Enable(USART1);
-
- USART_Interrput_Enable(USART1, USART_INT_RXDNE);
- // USART_Interrput_Enable(USART1, USART_INT_TXDE);
- NVIC_Priority_Group_Set(NVIC_PER2_SUB2_PRIORITYGROUP);
- /* Enable the USARTy Interrupt */
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Initializes(&NVIC_InitStructure);
-
- }
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为了方便接收数据,下面封装了简单的FIFO缓存,用于串口接收。
- typedef struct fifo_buffer
- {
- volatile uint32_t read_i;
- volatile uint32_t write_i;
- uint8_t buff[128];
- }fifo_buffer;
- fifo_buffer uart_rx = {
- .read_i = 0,
- .write_i = 0,
- };
- fifo_buffer uart_tx = {
- .read_i = 0,
- .write_i = 0,
- };
- void fifo_init(fifo_buffer *fifo)
- {
- fifo->read_i = 0;
- fifo->write_i = 0;
- }
- int fifo_push(fifo_buffer *fifo, uint8_t ch)
- {
- if(((fifo->write_i+1)&0x7f) != fifo->read_i)
- {
- fifo->buff[fifo->write_i++] = ch;
- fifo->write_i &= 0x7f;
- return 0;
- }else return 1; //full
- }
- int fifo_pop(fifo_buffer *fifo, uint8_t *ch)
- {
- if(fifo->read_i != fifo->write_i)
- {
- *ch = fifo->buff[fifo->read_i++];
- fifo->read_i &= 0x7f;
- return 0;
- }else return 1; //empty
- }
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串口中断如下:将接收的数据存入FIFO缓存,然后在主循环中取出数据。
- void USART1_IRQHandler(void)
- {
- uint8_t ch;
- if (USART_Interrupt_Status_Get(USART1, USART_INT_RXDNE) != RESET)
- {
- /* Read one byte from the receive data register */
- ch = USART_Data_Receive(USART1);
- fifo_push(&uart_rx,ch);
- }
- // if (USART_Interrupt_Status_Get(USART1, USART_INT_TXDE) != RESET)
- // {
- // /* Write one byte to the transmit data register */
- // if(fifo_pop(&uart_tx,&ch) == 0)
- // {
- // USART_Data_Send(USART1, ch);
- // }
- // }
- }
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串口发送,重定向到printf输出。
- int stdout_putchar (int ch)
- {
- while (0 == USART_Flag_Status_Get(USART1,USART_FLAG_TXDE));
- USART_Data_Send(USART1, ch);
- return ch;
- }
- int fputc(int ch,FILE *f)
- {
- return stdout_putchar(ch);
- }
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可以通过如下程序测试一下发送接收数据:将接收的数据重新发送出去。测试完成OK后,就可以进行nr_micro_shell移植了。
- int main(void)
- {
- uint8_t ch;
- SysTick_Config(SystemClockFrequency/1000);
- /* Initialize Led1~Led3 as output push-pull mode */
- LED_Initialize(LED1_GPIO_PORT, LED1_GPIO_PIN | LED2_GPIO_PIN );
- /* Turn off Led1~Led3 */
- LED_Off(LED1_GPIO_PORT, LED1_GPIO_PIN | LED2_GPIO_PIN );
-
- uart_init();
- printf("N32G430 USART1 TEST.\r\n");
-
- while(1)
- {
- if(fifo_pop(&uart_rx,&ch) == 0)
- {
- LED_Toggle(LED2_GPIO_PORT, LED2_GPIO_PIN);
- stdout_putchar(ch);
- }
- }
- }
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下面开始移植nr_micro_shell。首先下载shell源码,将源码添加到工程中:
添加源码头文件路径
然后配置shell功能,配置在nr_micro_shell_config.h文件中。主要配置串口shell输出打印函数
下一步就是初始化shell以及读取串口接收数据并传给shell解析。
然后编译下载即可。烧写成功后,打开串口测试一下。
程序:
n32_g430.zip
(1.4 MB, 下载次数: 0)
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