基于飞思卡尔MC9S12XEP的SPI程序

#define SPI_GLOBALS#include "spi.h"#define Write_To_FlashDataSize 15static uint8_t Dummy;//选中flashvoid SPICSLow(uint8_t Chip){if(Chip == 0){SPI_FLASH1_CS_LOW();//选中flash1}else{SPI_FLASH2_CS_LOW();//选中flash2}}//不选void SPICSHigh(uint8_t Chip){if(Chip == 0){SPI_FLASH1_CS_HIGH(); //不选中flash1}else{SPI_FLASH2_CS_HIGH(); //不选中flash2}}//flash 写使能void SPIWriteEnable(uint8_t Chip){SPICSLow(Chip); //bring the chosen chip's CS pin downDummy=SPIReadWriteByte(SPI2, SPI_CMD_WREN); //write Write_Enable command SPICSHigh(Chip); //bring the chosen chip's CS pin high}//flash 写除能void SPIWriteDisable(uint8_t Chip){SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_WRDI); //write Write_Disable commandSPICSHigh(Chip); //bring the chosen chip's CS pin down}//SPI初始化void SPIInit(void){DDRP_DDRP0 = 1;DDRP_DDRP1 = 1;DDRP_DDRP2 = 1;DDRP_DDRP3 = 1;SPI_WP1_OFF();SPI_WP2_OFF();SPI_FLASH1_CS_HIGH();SPI_FLASH2_CS_HIGH();SPI2BR = (0<<4) | (0); //(0+1)*2^(0+1) = 2, 20M/2 = 10MSPI2CR1 = 0x50; //主机模式}//SPI读flash的IDSPI_EXT uint16_t SPIReadID(uint8_t Chip){uint16_t ID;SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_RDID); //write the Read_ID commandDummy = SPIReadWriteByte(SPI2, 0x00); //write Addr[16:23] //写24位地址Dummy = SPIReadWriteByte(SPI2, 0x00); //write Addr[8:15]Dummy = SPIReadWriteByte(SPI2, 0x00); //write Addr[0:7]((uint8_t *)&ID)[0] = SPIReadWriteByte(SPI2, SPI_CMD_DUMMY);//manufacturer ID((uint8_t *)&ID)[1] = SPIReadWriteByte(SPI2, SPI_CMD_DUMMY); //device IDSPICSHigh(Chip); //bring the chosen chip's CS pin highreturn ID; //return the ID value}// SPI 读flash状态uint8_t SPIReadSta(uint8_t Chip){uint8_t Sta;SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_RDSR); //write the Read_Status commandSta = SPIReadWriteByte(SPI2, SPI_CMD_DUMMY); //statusSPICSHigh(Chip); //bring the chosen chip's CS pin highreturn Sta; //return the status value}// 等待芯片空闲（在执行Byte-Program，Sector-Erase，Block-Erase，Chip-Erase 操作后void SPIWaitBusy(uint8_t Chip){SPICSLow(Chip);while ((SPIReadSta(Chip) & 0x01) == 0x01); // waste time until not busy}///----------------------------------------------------------------------------------------------------------//Function: SPIFlash 初始化//Param://Return://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIFlashInit(void){uint8_t i;uint16_t ID;SPIInit();// memset(SPI_Flash_Info, 0, sizeof(SPI_Flash_Info));//for(i = 0; i < SPI_MAX_CHIPS; i++){ID = SPIReadID(i);SPI_Flash_Info[i].DeviceID = ID;SPI_Flash_Info[i].Size = (uint32_t)8*1024*1024;SPI_Flash_Info[i].SectorSize = 4*1024;SPI_Flash_Info[i].SectorPages = 16;SPI_Flash_Info[i].BlockSize = (uint32_t)64*1024;SPI_Flash_Info[i].Blocks = 128;SPI_Flash_Info[i].PageSize = 256;SPI_Flash_Info[i].Pages = 65536;}}/*--------------------------------------------------------------------------------------------------------SPI 收发送函数----------------------------------------------------------------------------------------------------------*/SPI_EXT uint8_t SPIReadWriteByte(uint8_t SPI, uint8_t Data){if(SPI<SPIS)switch(SPI){case SPI0: while(SPI0SR_SPTEF==0);SPI0DRL = Data;while(SPI0SR_SPIF==0);return SPI0DRL;break;case SPI2: while(SPI2SR_SPTEF==0);SPI2DRL = Data;while(SPI2SR_SPIF==0);return SPI2DRL;break;}}///----------------------------------------------------------------------------------------------------------//Function: 把Chip号芯片的Adress位置开始Len长度的数据读取到Buf中//Param://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIRead(uint8_t Chip, uint32_t Address, uint8_t *Buf, uint32_t Len) {uint32_t i;SPIWaitBusy(Chip); //判忙SPICSLow(Chip); //bring the chosen chip's CS pin downDummy =SPIReadWriteByte(SPI2, SPI_CMD_READ); //write Fast_Read command Dummy =SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[0]); //write Addr[16:23]Dummy =SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[1]); //write Addr[8:15]Dummy =SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[2]); //write Addr[0:7]for(i = 0; i < Len; i += 1){Buf[i] =SPIReadWriteByte(SPI2, SPI_CMD_DUMMY); //read data }SPICSHigh(Chip); //bring the chosen chip's CS pin high}///----------------------------------------------------------------------------------------------------------//Function: 向chip号芯片的Address位置开始的区域写入长度为Len的Buf内容//Param://Return://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIWritePage(uint8_t Chip, uint32_t Address, uint8_t Buf[], uint32_t Len){uint8_t i;SPIWriteEnable(Chip);SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_BYTE_WRITE); //write Byte_Write commandDummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[0]); //writeDummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[1]); //writeAddr[8:15]Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[2]); //writeAddr[0:7]for(i=0; i<Len; i+=1){Dummy = SPIReadWriteByte(SPI2, Buf[i]); //write the data to besent}SPICSHigh(Chip); //bring the chosen chip's CS pin highSPIWaitBusy(Chip); //判忙}///----------------------------------------------------------------------------------------------------------//Function: 擦除flash一个sector//Param://Return://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIEraseSector(uint8_t Chip, uint32_t Address){SPIWriteEnable(Chip); //write enableSPIWaitBusy(Chip); //判忙SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_4K_ERASE); //write 4K_Erasecommand Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[0]); //writeAddr[16:23]Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[1]); //writeAddr[8:15]Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[2]); //writeAddr[0:7]SPICSHigh(Chip); //bring the chosen chip's CS pin highSPIWriteDisable(Chip);SPIWaitBusy(Chip); //判忙}///----------------------------------------------------------------------------------------------------------//Function: 擦除flash一个block//Param://Return://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIEraseBlock(uint8_t Chip, uint32_t Address){SPIWriteEnable(Chip);SPIWaitBusy(Chip); //判忙SPICSLow(Chip); //bring the chosen chip's CS pin downDummy = SPIReadWriteByte(SPI2, SPI_CMD_64K_ERASE); //write 64K_Erase commandDummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[0]); //write Addr[16:23]Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[1]); //write Addr[8:15]Dummy = SPIReadWriteByte(SPI2, ((uint8_t *)&Address)[2]); //write Addr[0:7]SPICSHigh(Chip); //bring the chosen chip's CS pin highSPIWriteDisable(Chip);SPIWaitBusy(Chip); //判忙}///----------------------------------------------------------------------------------------------------------//Function: 擦除flash整片芯片//Param://Return://note///----------------------------------------------------------------------------------------------------------SPI_EXT void SPIEraseChip(uint8_t Chip){SPIWriteEnable(Chip);SPIWaitBusy(Chip); //判忙SPICSLow(Chip);Dummy = SPIReadWriteByte(SPI2, SPI_CMD_CHIP_ERASE);SPICSHigh(Chip);SPIWaitBusy(Chip); //判忙SPIWriteDisable(Chip);}/*----------------------------------------------------------------------------------------------------------向SPI_FlashBuf里面写入数据------------------------------------------------------------------------------------------------------------*///SPI_EXT SPIWriteToBuf/*----------------------------------------------------------------------------------------------------------向SPI_FlashBuf里面写入数据------------------------------------------------------------------------------------------------------------*/SPI_EXT void SPIWriteToBuf(uint8_t array[],uint8_t array_len){uint8_t i;for(i=0;i< array_len;i++)SPI_FlashBuf[i] = array[i];SPI2CR1_SPIE=1;//给SPI缓冲区写完数据，打开中断，将数据写入到Flash里面。