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ARM9

krishnaprabha G

Good morning,

I have doubt in spi.i have LPC3250 interfacing with SPI(AT25256AW).

void main()
{

eeprom_write(0x0000,0x55);
eeprom_read(0x0000);

}

void eeprom_write(unsigned short addr, unsigned char dat8)
{ unsigned char data [8];

/* send WREN command */ SPI1_CON|=0x00000004; //SPI1 is a Tx data [0] = 0x06; P3_OUTP_CLR=0x40000000; //cs=0 SPI_WR(data,1); SPI_Delay(10); P3_OUTP_SET=0x40000000; //cs=1 puts("\n\r NMS CARD2..............");

/* wait for EEPROM to become ready and write enabled - use RDSR */ /* loop until RDSR bit 1 becomes 1 and RDSR bit 0 becomes 0 */ while ((eeprom_rdsr() & 0x03) != 0x02);
} unsigned char eeprom_rdsr(void) { unsigned char data[2],var,temp;

SPI1_CON|=0x00000004; //SPI1 is a Tx data[0] = 0x05; //prepare RDSR P3_OUTP_CLR=0x40000000; //cs=0 SPI_WR(data,1); SPI_Delay(10); SPI1_CON&=0xfffffffb; //SPI1 is a Rx SPI_Delay(10); data[0]=0xff; SPI_WR(data,1); //dummy write //temp=SPI1_DAT; SPI_Delay(10); P3_OUTP_SET=0x40000000; //cs=1 var=SPI_RD(); return var; }

I was writing the WREN command. I observe the output in osciiloscope the output is 10000110, but i did not get the output in hyper terminal properly i.e output(0000).

Thanks&regards
Prabha