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关于SPI口和AT45DB081连接的问题！[转贴]
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下一篇 2008-02-03 22:17:36
/ 个人分类：转载类
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转贴自：http://bbs.21ic.com/club/bbs/list.asp?boardid=39&t=1461844&tp=%u5173%u4E8ESPI%u53E3%u548CAT45DB081%u8FDE%u63A5%u7684%u95EE%u9898%uFF01
放一段程序吧。读写没优化过，但保证能用 |
INT8U AT45DBBuf[528];
static OS_EVENT* AT45DBSem;
void AT45DBInit(void)
{
#if OS_CRITICAL_METHOD == 3
OS_CPU_SR cpu_sr;
#endif
AT45DBSem = OSSemCreate(1);
OS_ENTER_CRITICAL();
PCONP |= 0x00000100;
PINSEL0 &= 0xFFFF00FF;
PINSEL0 |= 0x00005500;
IO0DIR |= AT45DB_CS;
IO0SET = AT45DB_CS;
OS_EXIT_CRITICAL();
}
void AT45DBRead(INT16U u16_page)
{
#if OS_CRITICAL_METHOD == 3
OS_CPU_SR cpu_sr;
#endif
INT16U u16_cnt;
INT8U u8_err;
OSSemPend(AT45DBSem,0,&u8_err);
OS_ENTER_CRITICAL();
S0PCR = 0x38;
S0PCCR = FPCLK/2000000*2;
IO0CLR = AT45DB_CS;
S0PDR = 0x52;
while(0 == (S0PSR&0x80));
S0PDR = (INT8U)(u16_page>>6);
while(0 == (S0PSR&0x80));
S0PDR = ((INT8U)(u16_page))<<2;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
for(u16_cnt=0;u16_cnt<528;u16_cnt++)
{
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
AT45DBBuf[u16_cnt] = S0PDR;
}
IO0SET = AT45DB_CS;
OS_EXIT_CRITICAL();
OSSemPost(AT45DBSem);
}
void AT45DBWrite(INT16U u16_page)
{
#if OS_CRITICAL_METHOD == 3
OS_CPU_SR cpu_sr;
#endif
INT16U u16_cnt;
INT8U u8_err;
OSSemPend(AT45DBSem,0,&u8_err);
OS_ENTER_CRITICAL();
S0PCR = 0x38;
S0PCCR = FPCLK/2000000*2;
IO0CLR = AT45DB_CS;
S0PDR = 0x82;
while(0 == (S0PSR&0x80));
S0PDR = (INT8U)(u16_page>>6);
while(0 == (S0PSR&0x80));
S0PDR = ( (INT8U)(u16_page))<<2;
while(0 == (S0PSR&0x80));
S0PDR = 0x00;
while(0 == (S0PSR&0x80));
for(u16_cnt=0;u16_cnt<528;u16_cnt++)
{
S0PDR = AT45DBBuf[u16_cnt];
while(0 == (S0PSR&0x80));
}
IO0SET = AT45DB_CS;
OS_EXIT_CRITICAL();
OSTimeDly(20);
OSSemPost(AT45DBSem);
} | |
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