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SD Card 的代码
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嵌入式程序员之家--SD卡技術與應用趨勢
sd_wr_state.vhd
package sd_wr_state is
type SD_WR_STAT is
(
SD_WR_INIT, -- initialize
SD_WR_IDLE, -- ready to process any command
-- init card
SD_WR_PRE_WAIT_PWRUP, -- load 80 into counter
sd.c
#include "config.h"
#include "sd.h"
//----------------------------------------
//SPI initialize
void spi_init(void)
{
DDRB = 0xB7; //SI输入，SO，SCK，SS输出
SPCR = 0x50; //setup SPI
SPSR = 0x0