写一个LPC824用SPI驱动W25Q64的程序，SPI用最大的速率

下面是LPC824用SPI驱动W25Q64的程序，SPI使用最大速率（48MHz）：

#include "LPC8xx.h"

#define SPI_PORT LPC_SPI0
#define SPI_SSEL 3
#define SPI_CLK_PIN 7
#define SPI_MOSI_PIN 6
#define SPI_MISO_PIN 5

#define W25Q64_CMD_WRITE_ENABLE 0x06
#define W25Q64_CMD_WRITE_DISABLE 0x04
#define W25Q64_CMD_READ_STATUS_REG1 0x05
#define W25Q64_CMD_WRITE_STATUS_REG1 0x01
#define W25Q64_CMD_READ_DATA 0x03
#define W25Q64_CMD_PAGE_PROGRAM 0x02
#define W25Q64_CMD_CHIP_ERASE 0xC7
#define W25Q64_CMD_POWER_DOWN 0xB9
#define W25Q64_CMD_RELEASE_POWER_DOWN 0xAB

#define W25Q64_STATUS_REG1_BUSY_MASK (1 << 0)

static void SPI_Init(void)
{
    /* Enable clock for GPIO and SPI */
    LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 6) | (1 << 11);

    /* Configure SPI pins */
    LPC_IOCON->PIO0_7 = 0x02;  // CLK
    LPC_IOCON->PIO0_6 = 0x02;  // MOSI
    LPC_IOCON->PIO0_5 = 0x02;  // MISO
    LPC_IOCON->PIO0_3 = 0x02;  // SSEL

    /* Configure SPI */
    SPI_PORT->DIV = SystemCoreClock / 48000000 - 1;  // Set SPI clock to 48MHz
    SPI_PORT->CFG = (1 << 0) | (1 << 5) | (1 << 8);  // Enable SPI, master mode, CPHA = 1
}

static void SPI_SendByte(uint8_t data)
{
    SPI_PORT->TXDAT = data;
    while (!(SPI_PORT->STAT & (1 << 0)));  // Wait for transfer to complete
    SPI_PORT->RXDAT;  // Clear RX buffer
}

static uint8_t SPI_ReceiveByte(void)
{
    SPI_PORT->TXDAT = 0xFF;
    while (!(SPI_PORT->STAT & (1 << 0)));  // Wait for transfer to complete
    return SPI_PORT->RXDAT;
}

static void W25Q64_WriteEnable(void)
{
    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_WRITE_ENABLE);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);
}

static void W25Q64_WriteDisable(void)
{
    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_WRITE_DISABLE);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);
}

static uint8_t W25Q64_ReadStatusReg1(void)
{
    uint8_t status;

    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_READ_STATUS_REG1);
    status = SPI_ReceiveByte();
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);

    return status;
}

static void W25Q64_WriteStatusReg1(uint8_t status)
{
    W25Q64_WriteEnable();

    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_WRITE_STATUS_REG1);
    SPI_SendByte(status);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);

    while (W25Q64_ReadStatusReg1() & W25Q64_STATUS_REG1_BUSY_MASK);  // Wait for write to complete

    W25Q64_WriteDisable();
}

static void W25Q64_ReadData(uint32_t address, uint8_t *data, uint32_t length)
{
    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_READ_DATA);
    SPI_SendByte((address >> 16) & 0xFF);
    SPI_SendByte((address >> 8) & 0xFF);
    SPI_SendByte(address & 0xFF);
    while (length--)
    {
        *data++ = SPI_ReceiveByte();
    }
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);
}

static void W25Q64_PageProgram(uint32_t address, const uint8_t *data, uint32_t length)
{
    W25Q64_WriteEnable();

    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_PAGE_PROGRAM);
    SPI_SendByte((address >> 16) & 0xFF);
    SPI_SendByte((address >> 8) & 0xFF);
    SPI_SendByte(address & 0xFF);
    while (length--)
    {
        SPI_SendByte(*data++);
    }
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);

    while (W25Q64_ReadStatusReg1() & W25Q64_STATUS_REG1_BUSY_MASK);  // Wait for write to complete

    W25Q64_WriteDisable();
}

static void W25Q64_ChipErase(void)
{
    W25Q64_WriteEnable();

    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_CHIP_ERASE);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);

    while (W25Q64_ReadStatusReg1() & W25Q64_STATUS_REG1_BUSY_MASK);  // Wait for erase to complete

    W25Q64_WriteDisable();
}

static void W25Q64_PowerDown(void)
{
    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_POWER_DOWN);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);
}

static void W25Q64_ReleasePowerDown(void)
{
    LPC_GPIO_PORT->SET[0] = (1 << SPI_SSEL);
    SPI_SendByte(W25Q64_CMD_RELEASE_POWER_DOWN);
    LPC_GPIO_PORT->CLR[0] = (1 << SPI_SSEL);
}

int main(void)
{
    uint8_t data[256];

    SPI_Init();

    W25Q64_ChipErase();
    W25Q64_ReadData(0, data, sizeof(data));
    W25Q64_PageProgram(0, data, sizeof(data));

    while (1);

    return 0;
}

以上代码实现了W25Q64的基本操作，包括写使能、写禁止、读状态寄存器1、写状态寄存器1、读数据、页编程、擦除、进入掉电模式和唤醒掉电模式。在主函数中，程序先执行擦除操作，然后读出所有数据，再将数据写回去。