tc264串口通信接收数据

TC264是基于ARM Cortex-M4内核的微控制器，其串口通信接收数据的实现方式与其他微控制器类似。下面是一个简单的串口接收数据的示例程序：

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include "TC264.h"

#define UART_BAUDRATE  115200
#define UART_RX_BUFFER_SIZE  256

volatile uint8_t uart_rx_buffer[UART_RX_BUFFER_SIZE];
volatile uint8_t uart_rx_head = 0;
volatile uint8_t uart_rx_tail = 0;

void uart_init(void)
{
    uint32_t baudrate_div = (uint32_t)((float)SystemCoreClock / (float)(16 * UART_BAUDRATE));
    SCU_RESET->PRCLR0 |= SCU_RESET_PRCLR0_PERI_RESET_Msk;  // reset UART peripheral
    SCU_CLK->CLKCR |= SCU_CLK_CLKCR_UART_DIV_Msk;  // enable UART clock
    UART0->CR = 0;  // disable UART
    UART0->CR = UART_CR_RXEN_Msk | UART_CR_TXEN_Msk;  // enable RX and TX
    UART0->DIV = baudrate_div;  // set baudrate
    NVIC_EnableIRQ(UART0_IRQn);  // enable UART interrupt
}

void UART0_IRQHandler(void)
{
    uint8_t ch = UART0->RB;
    uint8_t next_head = (uart_rx_head + 1) % UART_RX_BUFFER_SIZE;
    if (next_head != uart_rx_tail) {
        uart_rx_buffer[uart_rx_head] = ch;
        uart_rx_head = next_head;
    }
}

bool uart_read_byte(uint8_t *ch)
{
    if (uart_rx_head == uart_rx_tail) {
        return false;
    }
    *ch = uart_rx_buffer[uart_rx_tail];
    uart_rx_tail = (uart_rx_tail + 1) % UART_RX_BUFFER_SIZE;
    return true;
}

int main(void)
{
    uart_init();
    while (1) {
        uint8_t ch;
        if (uart_read_byte(&ch)) {
            printf("Received: %c\n", ch);
        }
    }
    return 0;
}

该程序初始化了UART0串口，使其以115200波特率接收数据。当有数据到达时，UART0_IRQHandler()函数会被调用，将接收到的字节存储到一个循环缓冲区中。程序的主循环中通过uart_read_byte()函数从缓冲区中读取一个字节，如果缓冲区为空则返回false。可以根据实际需要修改缓冲区大小、波特率等参数。