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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 ---- SD卡SPI模式支持的命令
** Soft Packet of SD Card Driver: commands that sd card supported in spi mode
**
**------------------------------------------------------------------------------------------------------
** Created by: Ming Yuan Zheng
** Created date: 2005-1-6
** Version: V1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
** Modifi</textarea><BR>
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receive 0xFF when card is busy */
SPI_CS_Deassert(); /* 有錯 */
if(i < timeout)
return SD_NO_ERR; /* 返回0,表示沒超時 return 0 indicate that operation is not time out */
else
return SD_ERR_TIMEOUT_WAIT; /* 返回錯誤碼,表示超時 return error code indicate that operation is time out */
}
/********************************************************************************************************************
** 函數名稱: void SD_SPIDelay() Name: void SD_SPIDelay()
** 功能描述: SPI總線延時 Function: SPI Bus delay
** 輸 入: INT8U value: 延時值,不超過255 Input: INT8U value : delay value,do not beyond 255
** 輸 出: 無 Output: NULL
*********************************************************************************************************************/
void SD_SPIDelay(INT8U value)
{
INT8U i;
for (i = 0; i < value; i++)
SPI_SendByte(0xFF); /* 發送0xFF clock out 0xFF */
}
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