?? sddriver.c
字號(hào):
/****************************************Copyright (c)**************************************************
** Guangzhou ZLG-MCU Development Co.,LTD.
** graduate school
** http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name: sddriver.c
** Last modified Date: 2005-3-10
** Last Version: V2.0
** Descriptions: SD/MMC卡讀寫模塊: 物理層 用戶API函數(shù)
** Soft Packet of SD Card: user API funciton
**
**------------------------------------------------------------------------------------------------------
** Created by: Ming Yuan Zheng
** Created date: 2005-1-6
** Version: V1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by: Ming Yuan Zheng
** Modified date: 2005-3-10
** Version: V2.0
** Descriptions: 增加了對(duì)MMC卡的支持,增加了對(duì)UCOS-II的支持,使該模塊不僅能運(yùn)行于前后臺(tái)系統(tǒng),還可運(yùn)行
** 于UCOS-II上
**------------------------------------------------------------------------------------------------------
** Modified by: Ming Yuan Zheng
** Modified date: 2006-01-06
** Version: V2.01
** Descriptions: 增加了在禁止CRC時(shí),發(fā)送禁止CRC命令
**
**
********************************************************************************************************/
#include "config.h"
#include "sdhal.h"
#include "SDCmd.h"
#if SD_UCOSII_EN
OS_EVENT *pSemSD = NULL; /* 卡訪問(wèn)權(quán)限信號(hào)量 semaphore that access card */
#endif
/* SD卡信息結(jié)構(gòu)體變量 the information structure variable of SD Card */
sd_struct sds;
/* 超時(shí)時(shí)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(shí)時(shí)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(shí)時(shí)間因數(shù)表 timeout factor table */
const INT8U r2w_fator[8] = {1,2,4,8,16,32,64,128};
/*
***************************************************************************************************
用戶API函數(shù): 初始化,讀,寫,擦 SD卡 User API Function: Initialize,read,write,erase SD Card
***************************************************************************************************
*/
/*******************************************************************************************************************
** 函數(shù)名稱: INT8U SD_Initialize() Name: INT8U SD_Initialize()
** 功能描述: 初始化SD/MMC卡 Function: initialize SD/MMC card
** 輸 入: 無(wú) Input: NULL
** 輸 出: 0: 成功 >0: 錯(cuò)誤碼 Output: 0: right >0: error code
********************************************************************************************************************/
INT8U SD_Initialize(void)
{
INT8U recbuf[4],ret;
#if SD_UCOSII_EN
if (pSemSD == NULL)
{
pSemSD = OSSemCreate(1); /* 創(chuàng)建訪問(wèn)SD/MMC卡信號(hào)量 create SD/MMC semaphore */
if (pSemSD == NULL)
return SD_ERR_CREATE_SEMSD;
}
#endif
SD_StartSD();
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 */
{
ret = SD_ERR_NO_CARD;
goto SD_ERR;
}
SPI_CS_Assert(); /* 1. 置CS為低 assert CS */
SD_SPIDelay(25); /* 2. 至少延時(shí) 74 clock delay more than 74 clock */
SPI_CS_Deassert(); /* 3. 置CS為高 dessert CS */
SD_SPIDelay(2); /* 4. 延時(shí)2(8 clock) delay 2(8 clock) */
ret = SD_ResetSD(); /* 5. 發(fā)出CMDO命令復(fù)位SD卡 send CMD0 command to reset sd card */
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_ActiveInit(); /* 6. 激活卡進(jìn)入初始化過(guò)程. active card initialize process */
if (ret != SD_NO_ERR)
goto SD_ERR;
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)
goto SD_ERR;
if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33)
{
ret = SD_ERR_VOL_NOTSUSP; /* 不支持3.3V,返回錯(cuò)誤碼 not support 3.3V,return error code */
goto SD_ERR;
}
SPI_ClkToMax(); /* 8. 設(shè)置SPI時(shí)鐘到最大值 set SPI clock to maximum */
#if SD_CRC_EN
ret = SD_EnableCRC(1); /* 使能CRC校驗(yàn) enable CRC check */
#else
ret = SD_EnableCRC(0); /* 禁止CRC校驗(yàn) disable CRC check */
#endif
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_SetBlockLen(SD_BLOCKSIZE); /* 9. 設(shè)置塊的長(zhǎng)度: 512Bytes Set the block length: 512Bytes */
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_GetCardInfo(); /* 10. 讀CSD寄存器,獲取SD卡信息 read CSD register, get the information of SD card */
if (ret != SD_NO_ERR)
goto SD_ERR;
SD_EndSD();
SD_ERR:
SD_EndSD();
return ret;
}
/********************************************************************************************************************
** 函數(shù)名稱: INT8U SD_ReadBlock() Name: INT8U SD_ReadBlock()
** 功能描述: 從SD/MMC卡中讀一個(gè)塊 Function: read a single block from SD/MMC card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT8U *recbuf : 接收緩沖區(qū),長(zhǎng)度512Bytes INT8U *recbuf : the buffer of receive,length is 512Bytes
** 輸 出: 0: 成功 >0: 錯(cuò)誤碼 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_ReadBlock(INT32U blockaddr, INT8U *recbuf)
{
INT8U ret;
SD_StartSD(); /* 向OS申請(qǐng)?jiān)L問(wèn)卡信號(hào)量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡沒完全插入卡中 card is not inserted entirely */
}
if (blockaddr > sds.block_num)
{
SD_EndSD();
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)
{
SD_EndSD();
return ret;
}
ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf); /* 讀出數(shù)據(jù) read data from sd card */
SD_EndSD(); /* 歸還訪問(wèn)卡信號(hào)量 return semaphore acessed SD/MMC to OS */
return ret;
}
/********************************************************************************************************************
** 函數(shù)名稱: INT8U SD_ReadMultiBlock() Name: INT8U SD_ReadMultiBlock()
** 功能描述: 從SD/MMC卡中讀多個(gè)塊 Function: read multi blocks from SD/MMC card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 塊數(shù)量 INT32U blocknum : the numbers of block
INT8U *recbuf : 接收緩沖區(qū),每塊512字節(jié) INT8U *recbuf : the buffer of receive,each block length is 512Bytes
** 輸 出: 0: 成功 >0: 錯(cuò)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;
SD_StartSD(); /* 向OS申請(qǐng)?jiān)L問(wèn)卡信號(hào)量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡沒完全插入卡中 card is not inserted entirely */
}
if ((blockaddr + blocknum) > sds.block_num)
{
SD_EndSD();
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)
{
SD_EndSD(); /* 歸還訪問(wèn)卡信號(hào)量 return semaphore acessed SD/MMC to OS */
return ret;
}
for (i = 0; i < blocknum; i++)
{ /* 讀出數(shù)據(jù) read data from SD/MMC card */
ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf);
if (ret == SD_NO_ERR)
recbuf = recbuf + SD_BLOCKSIZE;
else
{
SD_EndSD();
return ret;
}
}
ret = SD_StopTransmission(); /* 結(jié)束數(shù)據(jù)傳輸 stop transmission operation */
SD_EndSD();
return ret;
}
#endif
/********************************************************************************************************************
** 函數(shù)名稱: INT8U SD_WriteBlock() Name: INT8U SD_WriteBlock()
** 功能描述: 向SD/MMC卡中寫入一個(gè)塊 Function: write a block to SD/MMC card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT8U *sendbuf : 發(fā)送緩沖區(qū),長(zhǎng)度512Bytes INT8U *sendbuf : the buffer of send,length is 512Bytes
** 輸 出: 0: 成功 >0: 錯(cuò)誤碼 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_WriteBlock(INT32U blockaddr, INT8U *sendbuf)
{
INT8U ret,tmp[2];
SD_StartSD(); /* 向OS申請(qǐng)?jiān)L問(wèn)卡信號(hào)量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡沒完全插入卡中 card is not inserted entirely */
}
if (blockaddr > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
SD_EndSD();
return SD_ERR_WRITE_PROTECT; /* 卡有寫保護(hù) */
}
ret = SD_WriteSingleBlock(blockaddr); /* 寫單塊命令 write single block */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
ret = SD_WriteBlockData(0, SD_BLOCKSIZE, sendbuf); /* 寫入數(shù)據(jù) 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)
{
SD_EndSD();
return ret; /* 讀寄存器失敗 read register fail */
}
if((tmp[0] != 0) || (tmp[1] != 0))
{
SD_EndSD();
ret = SD_ERR_WRITE_BLK; /* 響應(yīng)指示寫失敗 response indicate write fail */
}
}
SD_EndSD();
return ret; /* 返回寫入結(jié)果 return the result of writing */
}
/**********************************************************************************************************************
** 函數(shù)名稱: INT8U SD_WriteMultiBlock() Name: INT8U SD_WriteMultiBlock()
** 功能描述: 向SD/MMC卡中寫入多個(gè)塊 Function: write multi blocks to SD/MMC card
** 輸 入: INT32U blockaddr: 塊地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 塊數(shù)量 INT32U blocknum : the numbers of block
INT8U *sendbuf : 發(fā)送緩沖區(qū)每塊512字節(jié) INT8U *sendbuf : the send buffer,each block length is 512Bytes
** 輸 出: 0: 成功 >0: 錯(cuò)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,tmp[2];
SD_StartSD(); /* 向OS申請(qǐng)?jiān)L問(wèn)卡信號(hào)量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡沒完全插入卡中 card is not inserted entirely */
}
if ((blockaddr + blocknum) > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范圍 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
SD_EndSD();
return SD_ERR_WRITE_PROTECT; /* 卡有寫保護(hù) */
}
ret = SD_WriteMultipleBlock(blockaddr); /* 寫多塊命令 write multiple blocks command */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
for (i = 0; i < blocknum; i++)
{
ret = SD_WriteBlockData(1, SD_BLOCKSIZE, sendbuf); /* 寫入數(shù)據(jù) write data */
if (ret == SD_NO_ERR)
sendbuf = sendbuf + SD_BLOCKSIZE;
else
{ /* 寫失敗 write fail */
SD_StopTransmission(); /* 停止數(shù)據(jù)傳輸 stop data transmission */
SD_WaitBusy(SD_WAIT_WRITE); /* 等待 waiting */
SD_EndSD();
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -