这里贴一下自己的模拟SPI驱动，移植的话需要实现SPI管脚的定义和初始化。

一、管脚初始化

• MOSI_PIN：设置MOSI为输出模式
• SCK_PIN：设置SCK为输出模式
• CSN_PIN：设置CSN为输出模式
• MISO_PIN：设置MISO为输入模式
• MOSI_PIN_HIGH：设置MOSI为高电平
• MOSI_PIN_LOW：设置MOSI为低电平
• SCK_PIN_HIGH：设置SCK为高电平
• SCK_PIN_LOW：设置SCK为低电平
• CSN_PIN_HIGH：设置CSN为高电平
• CSN_PIN_LOW:设置CSN为低电平

二、模拟SPI时序

模拟时序的时钟设置为500kHz，即时钟拉高1us，拉低1us。

/*!* \brief   Simulate SPI read-timing method, base-read driver* \para    none* \retval  read_val:uint8_t*/
static uint8_t SPI_Read_OneByte(void)
{uint8_t i;uint8_t read_val = 0;for(i=0; i < 8; i++){val <<= 1;SCK_PIN_HIGH;         if(MISO_PIN == 1)read_val |= 0x01;elseread_val &= ~0x01;delay_us(1);//500KHz SPISCK_PIN_LOW;delay_us(1);//500kHz SPI}return read_val;
}
/*!* \brief   Simulate SPI write-timing method, base-write driver* \para    write_val:uint8_t* \retval  none*/
static void SPI_Write_OneByte(uint8_t write_val)
{uint8_t i;for(i=0; i < 8; i++){if(write_val & 0x80)MOSI_PIN_HIGH;elseMOSI_PIN_LOW;SCK_PIN_HIGH;write_val <<= 1;delay_us(1);//500KHz SPISCK_PIN_LOW;delay_us(1);//500KHz SPI}
}

三、SPI对外接口API

使用SPI_WriteData和SPI_ReadData操作SPI设备和外设。

/*!* \brief   SPI write buff method, api driver* \para    addr:uint8_t,reg addrdataptr:uint8_t *,pointer of SPI write bufflength:uint16_t, size of buff* \retval  none*/
void SPI_WriteData(uint8_t addr, uint8_t *dataptr, uint16_t length )
{int i;CSN_PIN_LOW;SPI_Write_OneByte(addr|WR_CMD); for(i = 0; i < length, i++)SPI_Write_OneByte(dataptr[i]);CSN_PIN_HIGH; 
}
/*!* \brief   SPI read buff method, api driver* \para    addr:uint8_t,reg addrdataptr:uint8_t *,pointer of SPI read bufflength:uint16_t, size of buff* \retval  none*/
void SPI_ReadData(uint_t addr, uint8_t *dataptr, uint16_t length )
{uint8_t value;int i;CSN_PIN_LOW; SPI_Write_OneByte(addr|RR_CMD);for(i = 0; i < length, i++)dataptr[i] = SPI_Read_OneByte();  CSN_PIN_HIGH;
}