?? sddriver.c
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/****************************************Copyright (c)**************************************************
** Guangzhou ZLG-MCU Development Co.,LTD.
** graduate school
** http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name: sddriver.c
** Last modified Date: 2005-1-6
** Last Version: V1.0
** Descriptions: sd 卡驅動軟件包: SD卡物理層 用戶API函數
** Soft Packet of SD Card Driver: user API funciton
********************************************************************************************************/
#include "config.h"
#include "sdconfig.h"
#include "sdhal.h"
#include "SDCmd.h"
#include "sddriver.h"
/* SD卡信息結構體變量 the information structure variable of SD Card */
sd_struct sds;
/* 超時時間單位表(單位:0.000000001ns) timeout unit table */
const INT32U time_unit[8] = {1000000000,100000000,10000000,
1000000,100000,10000,1000,100};
/* 超時時間表 timeout value table */
const INT8U time_value[16] = {0,10,12,13,15,20,25,30,
35,40,45,50,55,60,70,80};
/* 超時時間因數表 timeout factor table */
const INT8U r2w_fator[6] = {1,2,4,8,16,32};
/*
***************************************************************************************************
用戶API函數: 初始化,讀,寫,擦 SD卡 User API Function: Initialize,read,write,erase SD Card
***************************************************************************************************
*/
/*******************************************************************************************************************
** 函數名稱: INT8U SD_Initialize() Name: INT8U SD_Initialize()
** 功能描述: 初始化SD卡 Function: initialize sd card
** 輸 入: 無 Input: NULL
** 輸 出: 0: 正確 >0: 錯誤碼 Output: 0: right >0: error code
********************************************************************************************************************/
INT8U SD_Initialize(void)
{
INT8U recbuf[4],ret;
SD_HardWareInit(); /* 初始化讀寫SD卡的硬件條件 Initialize the hardware that access SD Card */
if (SD_ChkCard() != 1) /* 檢查卡是否插入 check weather card is inserted */
return SD_ERR_NO_CARD;
SPI_CS_Assert(); /* 1. 置CS為低 assert CS */
SD_SPIDelay(25); /* 2. 至少延時 74 clock delay more than 74 clock */
SPI_CS_Deassert(); /* 3. 置CS為高 dessert CS */
SD_SPIDelay(2); /* 4. 延時2(8 clock) delay 2(8 clock) */
ret = SD_ResetSD(); /* 5. 發出CMDO命令復位SD卡 send CMD0 command to reset sd card */
if (ret != SD_NO_ERR)
return ret;
ret = SD_ActiveInit(); /* 6. 激活卡進入初始化過程. active card initialize process */
if (ret != SD_NO_ERR)
return ret;
ret = SD_ReadOCR(4, recbuf); /* 7. 讀OCR寄存器,查詢卡支持的電壓值 read OCR register,get the supported voltage */
if (ret != SD_NO_ERR)
return ret;
if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33)
return SD_ERR_VOL_NOTSUSP; /* 不支持3.3V,返回錯誤碼 not support 3.3V,return error code */
SPI_ClkToMax(); /* 8. 設置SPI時鐘到最大值 set SPI clock to maximum */
#if SD_CRC_EN
ret = SD_EnableCRC(1); /* 使能CRC校驗 enable CRC check */
if (ret != SD_NO_ERR)
return ret;
#endif
ret = SD_SetBlockLen(SD_BLOCKSIZE); /* 9. 設置塊的長度: 512Bytes Set the block length: 512Bytes */
if (ret != SD_NO_ERR)
return ret;
return (SD_GetCardInfo()); /* 10. 讀CSD寄存器,獲取SD卡信息 read CSD register, get the information of SD card */
}
/********************************************************************************************************************
** 函數名稱: INT8U SD_ReadBlock() Name: INT8U SD_ReadBlock()
** 功能描述: 從SD卡中讀一個塊 Function: read a single block from sd card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT8U *recbuf : 接收緩沖區,長度512Bytes INT8U *recbuf : the buffer of receive,length is 512Bytes
** 輸 出: 0: 正確 >0: 錯誤碼 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_ReadBlock(INT32U blockaddr, INT8U *recbuf)
{
INT8U ret;
if (blockaddr > sds.block_num)
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
ret = SD_ReadSingleBlock(blockaddr); /* 讀單塊命令 read single blocks command */
if (ret != SD_NO_ERR)
return ret;
return (SD_ReadBlockData(SD_BLOCKSIZE, recbuf));/* 讀出數據 read data from sd card */
}
/********************************************************************************************************************
** 函數名稱: INT8U SD_ReadMultiBlock() Name: INT8U SD_ReadMultiBlock()
** 功能描述: 從SD卡中讀多個塊 Function: read multi blocks from sd card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 塊數量 INT32U blocknum : the numbers of block
INT8U *recbuf : 接收緩沖區,每塊512字節 INT8U *recbuf : the buffer of receive,each block length is 512Bytes
** 輸 出: 0: 正確 >0: 錯誤碼 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_ReadMultiBlock_EN
INT8U SD_ReadMultiBlock(INT32U blockaddr, INT32U blocknum, INT8U *recbuf)
{
INT32U i;
INT8U ret;
if ((blockaddr + blocknum) > sds.block_num)
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
ret = SD_ReadMultipleBlock(blockaddr); /* 讀多塊命令 read multiple blocks command */
if (ret != SD_NO_ERR)
return ret;
for (i = 0; i < blocknum; i++)
{ /* 讀出數據 read data from sd card */
ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf);
if (ret == SD_NO_ERR)
recbuf = recbuf + SD_BLOCKSIZE;
else
return ret;
}
return (SD_StopTransmission()); /* 結束數據傳輸 stop transmission operation */
}
#endif
/********************************************************************************************************************
** 函數名稱: INT8U SD_WriteBlock() Name: INT8U SD_WriteBlock()
** 功能描述: 向SD卡中寫入一個塊 Function: write a block to sd card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT8U *sendbuf : 發送緩沖區,長度512Bytes INT8U *sendbuf : the buffer of send,length is 512Bytes
** 輸 出: 0: 正確 >0: 錯誤碼 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_WriteBlock(INT32U blockaddr, INT8U *sendbuf)
{
INT8U ret,tmp[2];
if (blockaddr > sds.block_num)
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
if (SD_ChkCardWP() == 1)
return SD_ERR_WRITE_PROTECT; /* 卡有寫保護 */
ret = SD_WriteSingleBlock(blockaddr); /* 寫單塊命令 write single block */
if (ret != SD_NO_ERR)
return ret;
ret = SD_WriteBlockData(0, SD_BLOCKSIZE, sendbuf); /* 寫入數據 write data */
if (ret == SD_NO_ERR) /* 讀Card Status寄存器, 檢查寫入是否成功 */
{ /* read Card Status register to check write wheather sucessfully */
ret = SD_ReadCard_Status(2,tmp);
if (ret != SD_NO_ERR)
return ret; /* 讀寄存器失敗 read register fail */
if((tmp[0] != 0) || (tmp[1] != 0))
ret = SD_ERR_WRITE_BLK; /* 響應指示寫失敗 response indicate write fail */
}
return ret; /* 返回寫入結果 return the result of writing */
}
/**********************************************************************************************************************
** 函數名稱: INT8U SD_WriteMultiBlock() Name: INT8U SD_WriteMultiBlock()
** 功能描述: 向SD卡中寫入多個塊 Function: write multi blocks to sd card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 塊數量 INT32U blocknum : the numbers of block
INT8U *sendbuf : 發送緩沖區每塊512字節 INT8U *sendbuf : the send buffer,each block length is 512Bytes
** 輸 出: 0: 正確 >0: 錯誤碼 Output: 0: right >0: error code
***********************************************************************************************************************/
#if SD_WriteMultiBlock_EN
INT8U SD_WriteMultiBlock(INT32U blockaddr, INT32U blocknum, INT8U *sendbuf)
{
INT32U i;
INT8U ret;
if ((blockaddr + blocknum) > sds.block_num)
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
if (SD_ChkCardWP() == 1)
return SD_ERR_WRITE_PROTECT; /* 卡有寫保護 */
ret = SD_WriteMultipleBlock(blockaddr); /* 寫多塊命令 write multiple blocks command */
if (ret != SD_NO_ERR)
return ret;
for (i = 0; i < blocknum; i++)
{
ret = SD_WriteBlockData(1, SD_BLOCKSIZE, sendbuf); /* 寫入數據 write data */
if (ret == SD_NO_ERR)
sendbuf = sendbuf + SD_BLOCKSIZE;
else
{ /* 寫失敗 write fail */
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