SPI_FLASH高速讀寫

#include? "KH25L6406.h"

#define??? SPI_WAIT()???? while(FLASH_SPI->SR & BSY)

/*********************************************************************************************************
** Function name:?????? Send_Byte
** Descriptions:??????? 通過硬件SPI發(fā)送一個字節(jié)到串行Flash器件
** input parameters:??? data:? 發(fā)送的數(shù)據(jù)
** output parameters:?? NONE
** Returned value:????? NONE
*********************************************************************************************************/
static void Send_Byte(unsigned char ucdata)
{
//?? SSIDataPut(SSI0_BASE, ucdata);
??? SPI_WAIT();
??? FLASH_SPI->DR = ucdata;
}
/*********************************************************************************************************
** Function name:?????? Get_Byte
** Descriptions:??????? 通過硬件SPI接口接收一個字節(jié)到處理器
** input parameters:??? NONE
** output parameters:?? NONE
** Returned value:????? ReadData? 讀回的數(shù)據(jù)
*********************************************************************************************************/
static unsigned char Get_Byte(void)
{
?? uint16_t ulReadData;

//?? SSIDataPut(SSI0_BASE, 0xFF);???????????????????????? //? 發(fā)送一個無效字節(jié)，以產(chǎn)生接收時鐘
//?? SSIDataGet(SSI0_BASE, &ulReadData);
??? SPI_WAIT();
??? FLASH_SPI->DR = 0xFF;
??? SPI_WAIT();
??? while (FLASH_SPI->SR & RNE)
??? ulReadData = FLASH_SPI->DR;
??? return ((unsigned char)ulReadData);
}
/*********************************************************************************************************
** Function name:?????? SPIFIFOClear
** Descriptions:??????? SPI 清空FIFO
** input parameters:??? NONE
** Returned value:????? NONE
*********************************************************************************************************/
static void SPIFIFOClear(void)
{
??? uint16_t ulRecBuf = 0;
??? SPI_WAIT();
??? while (FLASH_SPI->SR & RNE)
??? {
????? ulRecBuf = FLASH_SPI->DR;
??? }?????????????????????????????????????????????????? /* 清空FIFO???????????????????? */?? ?
}

/*********************************************************************************************************
** Function name:?????? FLASH_GPIO_Init
** Descriptions:??????? GPIO口初始化
** input parameters:??? NONE
** output parameters:?? NONE
** Returned value:????? NONE
*********************************************************************************************************/
static void FLASH_KH25L6406E_GPIO_Init(void)
{
??? SPI_CS_FLASH_GPIO ->FIODIR |= _BV(SPI_CS_FLASH_PIN);
}

/*********************************************************************************************************
** Function name:?????? serialFlashInit
** Descriptions:??????? 初始化控制串行Flash的SSI管腳
** input parameters:??? tAnyDevice:? 串行Flash特性描述的結(jié)構(gòu)體指針
** output parameters:?? NONE
** Returned value:????? NONE
*********************************************************************************************************/
void? serialFlashInit ( void)
{
??? FLASH_KH25L6406E_GPIO_Init();
??? CE_Low();
??? SPIFIFOClear();
??? CE_High();
}

/*********************************************************************************************************
** Function name:?????? serialFlash_RdID
** Descriptions:??????? 讀取串行Flash完整的ID
** input parameters:??? tAnyDevice: 串行Flash特性描述的結(jié)構(gòu)體指針
**????????????????????? ulReadID:?? 存儲ID變量的指針
** output parameters:?? NONE
** Returned value:????? 操作成功則返回FLASH_OK,失敗則返回FLASH_ERROR
** 注?? 意:???????????? 若填入的參數(shù)不符合要求，則返回FLASH_ERROR
*********************************************************************************************************/
static uint32 serialFlash_RdID ( void)
{
??? uint32 ultemp = 0;

??? CE_Low();
??? Send_Byte(? ucReadJEDEC_ID);
??? SPIFIFOClear();
??? ultemp = (ultemp | Get_Byte()) << 8;??????????????????????? // 接收數(shù)據(jù)
??? ultemp = (ultemp | Get_Byte()) << 8;
??? ultemp = (ultemp | Get_Byte());
??? SPI_WAIT();
??? CE_High();
??? return ultemp;
}

/*********************************************************************************************************
** Function name:?????? serialFlash_SelfTest
** Descriptions:??????? 串行Flash自檢程序
** input parameters:??? NONE
** output parameters:?? FLASH_OK??? : SPI_FLASH正常
**????????????????????? FLASH_ERROR : SPI_FLASH器件錯誤
** Returned value:????? 操作成功則返回FLASH_OK,失敗則返回FLASH_ERROR
** 注?? 意:???????????? 若填入的參數(shù)不符合要求，則返回FLASH_ERROR
*********************************************************************************************************/
uint8 serialFlash_SelfTest( void)
{
??? if(serialFlash_RdID() == ulID)
??? {
??????? return FLASH_OK;
??? }
?? ?
??? return FLASH_ERROR;?? ?
}

/*********************************************************************************************************
** Function name:?????? serialFlash_RD
** Descriptions:??????? 從串行Flash的指定起始地址讀取指定字節(jié)的數(shù)據(jù)
** input parameters:??? tAnyDevice: 串行Flash特性描述的結(jié)構(gòu)體指針
**????????????????????? ulDstAddr:? 指定讀取數(shù)據(jù)的起始地址，范圍要根據(jù)具體的器件而定
**????????????????????? pucRcvBuf: 讀取數(shù)據(jù)存放的緩沖區(qū)指針
**????????????????????? ulNByte： 指定讀取數(shù)據(jù)的大小，以字節(jié)為單位。為0，表示不讀出任何數(shù)據(jù)。
** output parameters:?? NONE
** Returned value:????? 實際取出的字節(jié)數(shù)。一般情況下，應該等于ulNByte。如果小于ulNByte，則表示讀取數(shù)據(jù)
**????????????????????? 已經(jīng)達到最大地址處。
*********************************************************************************************************/
unsigned long serialFlash_RD ( unsigned long ulDstAddr,
???????????????????????????? unsigned char* pucRcvBuf, unsigned long ulNByte)
{
??? unsigned long i = 0;
??? if((ulNByte == 0) || (ulDstAddr > (? ulMaxAddr)))
??????? return (0);???????????????????????????????????????????????????? //? 檢查入口參數(shù)
?? ?
??? if ((ulDstAddr + ulNByte - 1) > (? ulMaxAddr))
??????? ulNByte = (? ulMaxAddr) - ulDstAddr + 1;


???? CE_Low();
???? Send_Byte(? ucRead);???????????????????? // 發(fā)送讀命令
???? Send_Byte(((ulDstAddr & 0xFFFFFF) >> 16));???????????????????????? // 發(fā)送地址信息:該地址由3個字節(jié)組成
???? Send_Byte(((ulDstAddr & 0xFFFF) >> 8));
???? Send_Byte(ulDstAddr & 0xFF);
???? if(? ucIsReadWait != 0)
??????? Send_Byte(0xFF);
???? SPIFIFOClear();
???? for (i = 0; i < ulNByte; i++)
???? {
???????? pucRcvBuf[i] = Get_Byte();
???? }
???? SPI_WAIT();
???? CE_High();


??? return (ulNByte);
}

/*********************************************************************************************************
** Function name:?????? serialFlash_WR
** Descriptions:??????? 向串行Flash指定地址寫入指定字節(jié)的數(shù)據(jù)
** input parameters:??? tAnyDevice: 串行Flash特性描述的結(jié)構(gòu)體
**????????????????????? ulDstAddr:? 指定讀取數(shù)據(jù)的起始地址，范圍要根據(jù)具體的器件而定
**????????????????????? pucSndBuf:? 發(fā)送緩沖區(qū)的指針
**????????????????????? ulNByte:??? 發(fā)送數(shù)據(jù)的大小，以字節(jié)為單位。為0，表示不編程任何數(shù)據(jù)。
** output parameters:?? NONE
** Returned value:????? 實際取出的字節(jié)數(shù)。一般情況下，應該等于ulNByte。如果小于ulNByte，則表示讀取數(shù)據(jù)
**????????????????????? 已經(jīng)達到最大地址處。
*********************************************************************************************************/
unsigned char serialFlash_PageProgram ( unsigned long ulDstAddr,
?????????????????????????????? unsigned char* pucSndBuf,uint16 ulNByte)
{
??? unsigned char ucTemp = 0, ucStatus = 0;
??? uint16 i;
??? uint8 ulReturn = 0;
?? ?
//??? if((ulNByte == 0) || (ulDstAddr > ulMaxAddr) || (ulNByte > 0x100))
//??? {
//??????? return 0;
//??? }
//??? ulNByte = (ulDstAddr/0x100 + ulNByte)/0x100;
//??? if((ulDstAddr/0x100 + ulNByte) > 0x100)
//??? {
//??????? ulNByte = 0x100 - ulDstAddr/0x100 + 1;
//??????? ulReturn = ulNByte;
//??? }
?? ?
??? do {
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? }while(ucTemp & 0x01);
??????? ?
??? do {?? ?
??????? CE_Low();
??????? Send_Byte( ucEnWrite);?????? // 發(fā)送寫使能命令
??????? SPI_WAIT();
??????? CE_High();
?????? ?
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? } while(!(ucTemp & 0x02));
?? ?
??? CE_Low();
??? Send_Byte(ucWrite);???? // 發(fā)送字節(jié)數(shù)據(jù)燒寫命令
??? Send_Byte(((ulDstAddr & 0xFFFFFF) >> 16));??? // 發(fā)送3個字節(jié)的地址信息
??? Send_Byte(((ulDstAddr & 0xFFFF) >> 8));
??? Send_Byte(ulDstAddr & 0xFF);
??? for (i = 0; i <= ulNByte; i ++)
??? {
??????? Send_Byte(*pucSndBuf++);??????????????????? // 發(fā)送被燒寫的數(shù)據(jù)
??? }
??? CE_High();
??? DelayUS(100);
??? do {
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? }while(ucTemp & 0x01);
?????? ?
?
??? CE_Low();
??? Send_Byte( ucDisWrite);?????? // 發(fā)送寫使能命令
??? SPI_WAIT();
??? CE_High();

??? return ulReturn;
}

/*********************************************************************************************************
** Function name:?????????? serialFlash_SecErase
** Descriptions:??????????? 對串行Flash的指定的扇區(qū)進行擦除操作
** input parameters:??????? tAnyDevice: 串行Flash特性描述的結(jié)構(gòu)體
**????????????????????????? ulSecNo: 指定需要擦除的扇區(qū)，0代表第0扇區(qū)
** output parameters:?????? NONE
** Returned value:????????? 操作成功則返回FLASH_OK,失敗則返回FLASH_ERROR
*********************************************************************************************************/
unsigned char serialFlash_SecErase( unsigned long ulSecNo)
{
??? unsigned char ucTemp= 0, ucStatus = 0;
??? unsigned long ulAddr = 0;
?? ?
??? if(ulSecNo > (? ulSecMax))
??????? return (FLASH_ERROR);
??? ulAddr = (? ulSecSize) * ulSecNo;// 計算扇區(qū)的起始地址

??? do {
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? }while(ucTemp & 0x01);
??????? ?
??? do {?? ?
??????? CE_Low();
??????? Send_Byte( ucEnWrite);?????? // 發(fā)送寫使能命令
??????? SPI_WAIT();
??????? CE_High();
?????? ?
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? } while(!(ucTemp & 0x02));
?? ?
??? CE_Low();
??? Send_Byte(? ucSecErase);????? // 發(fā)送扇區(qū)擦除指令
??? Send_Byte(((ulAddr & 0xFFFFFF) >> 16));???????????????? // 發(fā)送3個字節(jié)的地址信息
??? Send_Byte(((ulAddr & 0xFFFF) >> 8));
??? Send_Byte(ulAddr & 0xFF);
??? SPI_WAIT();
??? CE_High();
?? ?
??? do {
??????? CE_Low();
??????? Send_Byte( ucReadStatus);? // 發(fā)送讀狀態(tài)寄存器命令
??????? SPIFIFOClear();
??????? ucTemp = Get_Byte();??????? // 保存讀得的狀態(tài)寄存器值
??????? SPI_WAIT();
??????? CE_High();
??? }while(ucTemp & 0x01);
?????? ?
?
??? CE_Low();
??? Send_Byte( ucDisWrite);?????? // 發(fā)送寫使能命令
??? SPI_WAIT();
??? CE_High();
?? ?
??? return (FLASH_OK);
}

/********************************************************************************************************
????? END FILE
********************************************************************************************************/