CW32 UART FIFO例程

以下是一个简单的 CW32 UART FIFO 例程，用于使用 FIFO 缓冲区实现 UART 通信：

#include <stdio.h>
#include <stdlib.h>
#include <io.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <windows.h>

#define BUFFER_SIZE 1024

int main(int argc, char *argv[])
{
    HANDLE hCom;
    DCB dcb;
    COMMTIMEOUTS timeouts;
    char buffer[BUFFER_SIZE];
    DWORD bytesRead, bytesWritten;
    BOOL success;

    memset(&dcb, 0, sizeof(dcb));
    dcb.DCBlength = sizeof(dcb);

    hCom = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hCom == INVALID_HANDLE_VALUE) {
        fprintf(stderr, "Error opening COM port\n");
        return 1;
    }

    success = GetCommState(hCom, &dcb);
    if (!success) {
        fprintf(stderr, "Error getting DCB\n");
        CloseHandle(hCom);
        return 1;
    }

    dcb.BaudRate = CBR_9600;
    dcb.ByteSize = 8;
    dcb.Parity = NOPARITY;
    dcb.StopBits = ONESTOPBIT;
    success = SetCommState(hCom, &dcb);
    if (!success) {
        fprintf(stderr, "Error setting DCB\n");
        CloseHandle(hCom);
        return 1;
    }

    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    success = SetCommTimeouts(hCom, &timeouts);
    if (!success) {
        fprintf(stderr, "Error setting timeouts\n");
        CloseHandle(hCom);
        return 1;
    }

    while (1) {
        success = ReadFile(hCom, buffer, BUFFER_SIZE, &bytesRead, NULL);
        if (!success) {
            fprintf(stderr, "Error reading from COM port\n");
            CloseHandle(hCom);
            return 1;
        }

        if (bytesRead > 0) {
            success = WriteFile(hCom, buffer, bytesRead, &bytesWritten, NULL);
            if (!success) {
                fprintf(stderr, "Error writing to COM port\n");
                CloseHandle(hCom);
                return 1;
            }
        }
    }

    CloseHandle(hCom);
    return 0;
}

这个例程使用了 Windows API 中的 CreateFile、GetCommState、SetCommState、SetCommTimeouts、ReadFile 和 WriteFile 函数来与 CW32 的 UART 进行通信。其中，ReadFile 和 WriteFile 函数使用了缓冲区来实现数据的 FIFO 储存。具体实现可以参考上述代码。