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要写一个SD卡在SPI模式下的简单的读写程序~~
这两天光看文档没什么思路，而且对语言运用也不熟~
想找个初始化的程序看看，但没有找到合适的~~请高人指点~~
对C语言嵌入式开发不是很了解，请问有什么比较好的书么？
------解决方案--------------------
SPI模式的初始化函数
- C/C++ code
INT8U SD_Init(void)
{
INT8U retry, temp;
INT8U i = 0;
INT8U CMD[] = {CMD0, 0x00, 0x00, 0x00, 0x00, 0x95};
MSPI_Init(0);
SD_Enable();
for(i=0;i<250;i++)
__asm
{
NOP
}
for(i = 0; i < 0x0f; i++)
{
SPI_RW(0xff); //发送至少74个时钟
}
//Send Command CMD0 to SD/SD Card
retry = 0;
do
{ //retry 200 times to send CMD0 command
temp = Write_Command_SD(CMD);
retry++;
if(retry >= 200)
{ //time out
return(INIT_CMD0_ERROR); //CMD0 Error!
}
}
while(temp != 1);
//Send Command CMD1 to SD/SD-Card
CMD[0] = CMD1; //Command 1
CMD[5] = 0xFF;
retry = 0;
do
{ //retry 100 times to send CMD1 command
temp=Write_Command_SD(CMD);
retry++;
if(retry>=100)
{ //time out
return(INIT_CMD1_ERROR);//CMD1 Error!
}
}
while(temp != 0);
MSPI_Init(1);
SD_Disable();
return(0);
}