下面这段代码是读NANDFlash的ID,用AT91SAM7S64模块8位并行总线接口,三块板子都不成功,估计是软件问题.
/* void KEY_ISR (void) __irq { INT8U i; *AT91C_AIC_IDCR = (1 << AT91C_ID_PIOA); //禁止PIOA外围中断功能 i = *AT91C_PIOA_ISR; *AT91C_AIC_ICCR = (1<<AT91C_ID_PIOA); DBGU_Print("Interrupt
"); *AT91C_AIC_IECR = (1<<AT91C_ID_PIOA); //使能PIOA外围中断 *AT91C_AIC_EOICR = 0; // End of Interrupt } */
//---------------------------------------------------------------------- void port_Delay(INT16U time) { INT16U i; { for(i=0; i<time; i++); } }
//---------------------------------------------------------------------- void port_ClkOpen(void) { *AT91C_PMC_SCER = AT91C_CKGR_MOSCEN; //使能系统时钟寄存器的处理器时钟 *AT91C_PMC_PCER = 1 << AT91C_ID_PIOA; }
//////////////////////////////////////////////////////////////// void port_8BitInit(void) { *AT91C_PIOA_PER |= PORT_CTRL_MASK; *AT91C_PIOA_OER |= (PORT_CTRL_MASK | PORT_8BIT); //*AT91C_PIOA_ODR |= (NUSB_INT | HDD_INTRQ); *AT91C_PIOA_PPUER |= (PORT_CTRL_MASK | PORT_8BIT ); *AT91C_PIOA_OWER = PORT_8BIT; *AT91C_PIOA_OWDR = ~PORT_8BIT;
NWRITE_HIGH(); //拉高写信号线 NREAD_HIGH(); //拉高读信号线
NLEBA_HIGH(); //总线器件片选切换到非选中状态 // NLEAB_HIGH(); // NOEBA_HIGH(); // NOEAB_HIGH(); }
//------------------------------------------------------------------------ void port_IntInit(void) { /* *AT91C_AIC_IDCR = (1 << AT91C_ID_PIOA); //禁止PIOA外围中断功能 AT91C_BASE_AIC->AIC_SMR[AT91C_ID_PIOA] = (AT91C_AIC_PRIOR_HIGHEST | AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED); //中断模式(中断级别和触发模式) *AT91C_AIC_ICCR = (1<<AT91C_ID_PIOA); //中断清除 *AT91C_PIOA_IDR = 0xffffffff; //禁止所有PIOA中断 // AT91C_BASE_AIC->AIC_SVR[AT91C_ID_PIOA] = (unsigned long)KEY_ISR; // *AT91C_PIOA_IER = (SW3_MASK | SW4_MASK); //允许SW3,4中断 *AT91C_AIC_IECR = (1<<AT91C_ID_PIOA); //使能PIOA外围中断 *AT91C_AIC_FFDR = 0xffffffff; //禁止FIQ */ }
//---------------------------------------------------------------------- /* INT8U port_GetINT(INT8U u8Device) { if(CH375_INTRQ == u8Device) { if(*AT91C_PIOA_PDSR & NUSB_INT) { return 1; } else { return 0; } } else if(IDE_INTRQ == u8Device) { if(*AT91C_PIOA_PDSR & HDD_INTRQ) { return 1; } else { return 0; } } return 0; } */
//---------------------------------------------------------------------- void port_SetAddress(INT8U u8Add) { *AT91C_PIOA_ODSR = ((INT32U)u8Add)<<ADPort_Offset; ADD_LATCH_HIGH(); // port_Delay(1); ADD_LATCH_LOW(); }
//---------------------------------------------------------------------- void port_WriteData(INT8U add, INT8U data) { port_SetAddress(add); //0111 1110b *AT91C_PIOA_ODSR = ((INT32U)data)<<ADPort_Offset;
NWRITE_LOW(); // port_Delay(1); NWRITE_HIGH(); }
void port_WriteDataNoAdd(INT8U data) { *AT91C_PIOA_ODSR = ((INT32U)data)<<ADPort_Offset;
NWRITE_LOW(); // port_Delay(1); NWRITE_HIGH(); }
//---------------------------------------------------------------------- INT8U port_ReadData(INT8U add) { INT32U temp32; INT8U temp8; port_SetAddress(add); //0111 1110b *AT91C_PIOA_ODR |= (PORT_8BIT); NREAD_LOW(); // port_Delay(1); temp32 = *AT91C_PIOA_PDSR; NREAD_HIGH(); *AT91C_PIOA_OER |= (PORT_8BIT); temp8 = (INT8U)(temp32>>ADPort_Offset); return temp8; }
//---------------------------------------------------------------------- INT8U port_ReadDataNoAdd(void) { INT32U temp32; INT8U temp8; *AT91C_PIOA_ODR |= (PORT_8BIT); NREAD_LOW(); // port_Delay(1); temp32 = *AT91C_PIOA_PDSR; NREAD_HIGH(); *AT91C_PIOA_OER |= (PORT_8BIT); temp8 = (INT8U)(temp32>>ADPort_Offset); return temp8; }
void TestADPort(void) { port_8BitInit(); while(1) { Nandflash_CMD_LATCH_HIGH(); Nandflash_CMD_LATCH_LOW(); Nandflash_ADDR_LATCH_HIGH(); Nandflash_ADDR_LATCH_LOW(); NLEBA_HIGH(); NLEBA_LOW(); port_WriteDataNoAdd(0x00); port_WriteDataNoAdd(0xff); port_WriteDataNoAdd(0x55); port_WriteDataNoAdd(0xaa); }
}
#define COMMAND 0x03 #define ADDRESS 0x05 #define D_DATA 0x01 #define INACTIVE 0x09
void NandFlash_Reset(void) //flash reset { unsigned int i;
NLEBA_LOW(); Nandflash_CMD_LATCH_HIGH(); Nandflash_ADDR_LATCH_LOW(); port_WriteDataNoAdd(0xff); NLEBA_HIGH();
for (i=0; i<3000; i++) ; //delay }
void NandFlash_ReadID(uchar *IDBuff) { uchar ucIDBuff[4];
NLEBA_LOW();
Nandflash_CMD_LATCH_HIGH(); Nandflash_ADDR_LATCH_LOW(); port_WriteDataNoAdd(0x90);
Nandflash_CMD_LATCH_LOW(); Nandflash_ADDR_LATCH_HIGH(); port_WriteDataNoAdd(0x00);
Nandflash_CMD_LATCH_LOW(); Nandflash_ADDR_LATCH_LOW();
ucIDBuff[0] = port_ReadDataNoAdd(); ucIDBuff[1] = port_ReadDataNoAdd(); ucIDBuff[2] = port_ReadDataNoAdd(); ucIDBuff[3] = port_ReadDataNoAdd(); memcpy(IDBuff,ucIDBuff,4);
NLEBA_HIGH(); }
void TestNandFlash(void) { uchar ucDataBuff[4];
NandFlash_Reset(); NandFlash_ReadID(ucDataBuff); }
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