使用Intel Serial IO SPI接口的API函数实现SPI通信代码示例

以下是使用Intel Serial IO SPI接口的API函数实现SPI通信的基本代码示例：

#include <windows.h>
#include <devioctl.h>
#include <initguid.h>
#include <ntddser.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#pragma comment(lib, "setupapi.lib")
#pragma comment(lib, "winusb.lib")

#define BUFFER_SIZE 256

// Serial IO SPI GUID
DEFINE_GUID(GUID_DEVINTERFACE_SERIAL_IO_SPI, 0x7eac6a6d, 0x5c98, 0x4b6f, 0x87, 0x3e, 0x35, 0x4e, 0x47, 0x3d, 0x57, 0x5d);

// Serial IO SPI transfer structure
typedef struct _SERIAL_IO_SPI_TRANSFER {
    ULONG Length;
    ULONG Timeout;
    UCHAR Data[ANYSIZE_ARRAY];
} SERIAL_IO_SPI_TRANSFER, *PSERIAL_IO_SPI_TRANSFER;

// Serial IO SPI device handle
HANDLE SpiHandle = INVALID_HANDLE_VALUE;

// Serial IO SPI transfer function
BOOL SpiTransfer(PSERIAL_IO_SPI_TRANSFER Transfer)
{
    DWORD BytesReturned;
    return DeviceIoControl(SpiHandle, IOCTL_SERIAL_IO_SPI_TRANSFER, Transfer, sizeof(SERIAL_IO_SPI_TRANSFER) + Transfer->Length - ANYSIZE_ARRAY, NULL, 0, &BytesReturned, NULL);
}

// Main function
int main()
{
    // Open the Serial IO SPI device
    HDEVINFO DevInfo = SetupDiGetClassDevs(&GUID_DEVINTERFACE_SERIAL_IO_SPI, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
    if (DevInfo == INVALID_HANDLE_VALUE) {
        printf("Failed to get device handle.\n");
        return 1;
    }

    SP_DEVICE_INTERFACE_DATA DevInterface = { sizeof(SP_DEVICE_INTERFACE_DATA) };
    DWORD DevIndex = 0;
    while (SetupDiEnumDeviceInterfaces(DevInfo, NULL, &GUID_DEVINTERFACE_SERIAL_IO_SPI, DevIndex++, &DevInterface)) {
        DWORD RequiredSize;
        SetupDiGetDeviceInterfaceDetail(DevInfo, &DevInterface, NULL, 0, &RequiredSize, NULL);
        PSP_DEVICE_INTERFACE_DETAIL_DATA DevDetail = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(RequiredSize);
        DevDetail->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
        if (SetupDiGetDeviceInterfaceDetail(DevInfo, &DevInterface, DevDetail, RequiredSize, NULL, NULL)) {
            SpiHandle = CreateFile(DevDetail->DevicePath, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
            if (SpiHandle != INVALID_HANDLE_VALUE) break;
        }
        free(DevDetail);
    }

    if (SpiHandle == INVALID_HANDLE_VALUE) {
        printf("Failed to open device.\n");
        SetupDiDestroyDeviceInfoList(DevInfo);
        return 1;
    }

    // Configure the Serial IO SPI device
    SERIAL_IO_SPI_TRANSFER TransferCfg = { 2, 0, { 0x80, 0x00 } };
    if (!SpiTransfer(&TransferCfg)) {
        printf("Failed to configure device.\n");
        CloseHandle(SpiHandle);
        SetupDiDestroyDeviceInfoList(DevInfo);
        return 1;
    }

    // Send and receive data over Serial IO SPI
    SERIAL_IO_SPI_TRANSFER Transfer = { BUFFER_SIZE, 0 };
    memset(Transfer.Data, 0xAA, BUFFER_SIZE);
    if (!SpiTransfer(&Transfer)) {
        printf("Failed to send data.\n");
        CloseHandle(SpiHandle);
        SetupDiDestroyDeviceInfoList(DevInfo);
        return 1;
    }
    for (ULONG i = 0; i < Transfer.Length; i++) {
        printf("%02X ", Transfer.Data[i]);
    }
    printf("\n");

    // Close the Serial IO SPI device
    CloseHandle(SpiHandle);
    SetupDiDestroyDeviceInfoList(DevInfo);

    return 0;
}

这段代码使用Windows平台的API函数实现了对Intel Serial IO SPI接口的访问和数据传输。其中，使用了Windows平台的设备管理和IO控制函数来打开、配置和关闭Serial IO SPI设备，并通过传递SPI传输结构体的方式来实现数据传输。具体来说：

1. 使用`SetupDiGetClassDevs()`和`SetupDiEnumDeviceInterfaces()`函数来获取Serial IO SPI设备的句柄，并使用`CreateFile()`函数来打开Serial IO SPI设备。
2. 使用`DeviceIoControl()`函数和`IOCTL_SERIAL_IO_SPI_TRANSFER`控制码来实现SPI数据传输。其中，要传递一个`SERIAL_IO_SPI_TRANSFER`结构体，包含要传输的数据和传输的长度等信息。
3. 上述代码实现了一个简单的SPI数据发送和接收过程，具体可以根据实际情况进行修改。

需要注意的是，上述代码中使用了Windows平台的API函数，如果要在其他平台上使用，可能需要进行相应的修改。同时，还需要根据具体的硬件平台和SPI设备的特性进行相应的配置和调试。