【N32G430开发板】+ usart shell移植
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);
}
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;
}fifo_buffer;
fifo_bufferuart_rx = {
.read_i = 0,
.write_i = 0,
};
fifo_bufferuart_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 = 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 &= 0x7f;
return 0;
}else return 1; //empty
}
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);
// }
// }
}
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);
}
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);
}
}
}
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：
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