帮我写一段TMS320F28335要通过gpio模拟spi读写cav25128芯片的代码，cav25128是一个eeprom芯片，你了解么

当然了解，Cav25128是一种SPI EEPROM芯片，其主要特点是具有高速的SPI接口和大容量的存储空间。下面是TMS320F28335通过GPIO模拟SPI读写Cav25128的代码：

#include "DSP2833x_Device.h"

#define EEPROM_CS_GPIO 0x0001
#define EEPROM_CLK_GPIO 0x0002
#define EEPROM_MOSI_GPIO 0x0004
#define EEPROM_MISO_GPIO 0x0008

void Init_GPIO(void)
{
    EALLOW;
    GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO2 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;
    GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;
    GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 0;
    GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 0;
    GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO1 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO2 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO3 = 0;
    EDIS;
}

void SPI_WriteByte(Uint16 data)
{
    Uint16 i;

    GpioDataRegs.GPASET.bit.GPIO0 = EEPROM_CS_GPIO;

    for (i = 0; i < 8; i++)
    {
        if (data & 0x80)
        {
            GpioDataRegs.GPASET.bit.GPIO2 = EEPROM_MOSI_GPIO;
        }
        else
        {
            GpioDataRegs.GPACLEAR.bit.GPIO2 = EEPROM_MOSI_GPIO;
        }

        GpioDataRegs.GPASET.bit.GPIO1 = EEPROM_CLK_GPIO;
        data <<= 1;
        GpioDataRegs.GPACLEAR.bit.GPIO1 = EEPROM_CLK_GPIO;
    }

    GpioDataRegs.GPACLEAR.bit.GPIO0 = EEPROM_CS_GPIO;
}

Uint16 SPI_ReadByte(void)
{
    Uint16 i;
    Uint16 data = 0;

    GpioDataRegs.GPASET.bit.GPIO0 = EEPROM_CS_GPIO;

    for (i = 0; i < 8; i++)
    {
        GpioDataRegs.GPASET.bit.GPIO1 = EEPROM_CLK_GPIO;
        data <<= 1;

        if (GpioDataRegs.GPADAT.bit.GPIO3)
        {
            data |= 0x01;
        }

        GpioDataRegs.GPACLEAR.bit.GPIO1 = EEPROM_CLK_GPIO;
    }

    GpioDataRegs.GPACLEAR.bit.GPIO0 = EEPROM_CS_GPIO;

    return data;
}

void EEPROM_WriteByte(Uint16 address, Uint16 data)
{
    SPI_WriteByte(0x06); //发送写使能命令
    GpioDataRegs.GPASET.bit.GPIO0 = EEPROM_CS_GPIO;
    GpioDataRegs.GPACLEAR.bit.GPIO1 = EEPROM_CLK_GPIO;
    GpioDataRegs.GPASET.bit.GPIO2 = EEPROM_MOSI_GPIO;
    GpioDataRegs.GPACLEAR.bit.GPIO2 = EEPROM_MOSI_GPIO;
    GpioDataRegs.GPASET.bit.GPIO1 = EEPROM_CLK_GPIO;
    GpioDataRegs.GPACLEAR.bit.GPIO1 = EEPROM_CLK_GPIO;
    SPI_WriteByte(0x02); //发送写命令
    SPI_WriteByte(address >> 8); //发送地址高位
    SPI_WriteByte(address & 0xFF); //发送地址低位
    SPI_WriteByte(data); //发送数据
    GpioDataRegs.GPACLEAR.bit.GPIO0 = EEPROM_CS_GPIO;
}

Uint16 EEPROM_ReadByte(Uint16 address)
{
    Uint16 data;

    SPI_WriteByte(0x03); //发送读命令
    SPI_WriteByte(address >> 8); //发送地址高位
    SPI_WriteByte(address & 0xFF); //发送地址低位
    data = SPI_ReadByte(); //读取数据

    return data;
}

void main()
{
    Init_GPIO(); //初始化GPIO
    EEPROM_WriteByte(0x0000, 0x1234); //向地址0x0000写入数据0x1234
    Uint16 data = EEPROM_ReadByte(0x0000); //从地址0x0000读取数据
}

以上代码实现了通过GPIO模拟SPI读写Cav25128芯片的功能，其中函数SPI_WriteByte和SPI_ReadByte实现了SPI的写和读操作，函数EEPROM_WriteByte和EEPROM_ReadByte实现了EEPROM的写和读操作。