how to interface spi with arm lpc2378

 how to interface spi with arm lpc2378

how i should configure spi at45db161

tell me some basic idea
how to read and write
thank you

 RE: how to interface spi with arm lpc2378

Plz go through datasheet of AT45DB161 dataflash.
and usermanual of LPC 2378.You will get idea for interfacing.

Shaym T.

 RE: how to interface spi with arm lpc2378

Are you going to transfer data in both directions? I don't know about the AT45DB161, but the LPC2378 has DMA or FIFO which means that it can run as slave at very high speeds without having troubles picking up incoming data.

A lot of processors only have a single shift register for incoming/outgoing transfers, so you may have a very short time to pick up the just received byte before it gets overwritten by the next bit on the way in from the master.

 RE: how to interface spi with arm lpc2378

thank u
i written this code for simple raed and write operation with spi
but i m not getting

InitSPI();

IOCLR0 = SPI0_SEL; Write_SPI(0x84); // opcode Write on buffer 1 Write_SPI(0x00); Write_SPI(0x55); // data into buffer 1

// data = Read_SPI();

Write_SPI(0x83); //opcode buff to MM Write_SPI(0x00); // location of MM Write_SPI(0x00); // location of MM Delay(1000);

Write_SPI(0x54); // Read opcode for buffer 1 Write_SPI(0x00); // bufffer address

Delay(1000); data = Read_SPI(); TransmitChar0(data>>8); TransmitChar0(data);

}
/***************************************** /* main end */
void InitSPI(void)
{ PCONP |= (1 << 8); PINSEL0 |= 0xC0000000; //P0.15 PINSEL1 |= 0x0000003C; //P0.16,P0.17,P0.18 PCONP |= (1 << 8); S0SPCR = 0x00; IODIR0 = SPI0_SEL; IOSET0 = SPI0_SEL; S0SPCR = 0x20; S0SPCCR = 0x96; // Check it first
}

void Write_SPI(unsigned char spiTx)
{ S0SPDR = spiTx; while(!(S0SPSR & SPIF));
} unsigned char Read_SPI()
{ unsigned char spiRx; spiRx = S0SPDR; return (spiRx);
} void SPI_ISR (void) __irq
{ S0SPINT = 0x01;

VICVectAddr = 0x00000000;
}

 You need pay more attention

The instructions for posting source code are very clear and easy to follow:

http://www.danlhenry.com/caps/keil_code.png

If you can miss something so obvious as that, and not even notice the problem in the Preview or in the actual post - and do it twice - then it is very likely that you have missed important details in the NXP documentation.

Go back to the NXP documentation and study it thoroughly...

 RE: You need pay more attention

thank you sir,

actulally i m not getting sck clock from the processor,
i checked that pin on CRO .
in lpc user manual they given that in master mode clock counter value is even and equal to 8 or greater than this.
i initialised tthat value also but then also i m not getting sck on that pin.
whenever i get clock then i will go ahead.
this is my code ..
int main (void)
{ SYS_TargetResetInit(); PCONP |= (1 << 8);
/* by default, it's enabled already, for safety reason */ PINSEL0 |= 0xC0000000; PINSEL1 |= 0x0000003C; S0SPCCR = 0x8; ** how much value i should enter
i tried so many freqvency above 0x8 S0SPCR = 0x000;
}

void SYS_TargetResetInit(void)
{ SCS |= 0x20;
/* Enable main OSC */ while( !(SCS & 0x40) );
/* Wait until main OSC is usable */ CLKSRCSEL = 0x1;
/* select main OSC, 12MHz, as the PLL clock source */ PCLKSEL0 = 0x55555555;
/* PCLK is the same as CCLK */ PCLKSEL1 = 0x55555555; SYS_GPIOResetInit();
}

thank u

 RE: You need pay more attention

thank you sir,

actulally i m not getting sck clock from the processor,
i checked that pin on CRO .
in lpc user manual they given that in master mode clock counter value is even and equal to 8 or greater than this.
i initialised tthat value also but then also i m not getting sck on that pin.
whenever i get clock then i will go ahead.
this is my code ..
< pre>
int main (void)
{

SYS_TargetResetInit();

PCONP |= (1 << 8);

/* by default, it's enabled already, for safety reason */ PINSEL0 |= 0xC0000000;

PINSEL1 |= 0x0000003C;

S0SPCCR = 0x8;

S0SPCR = 0x000;

}

void SYS_TargetResetInit(void)
{

SCS |= 0x20;

/* Enable main OSC */

while( !(SCS & 0x40) );

/* Wait until main OSC is usable */

CLKSRCSEL = 0x1;

/* select main OSC, 12MHz, as the PLL clock source */

PCLKSEL0 = 0x55555555;

/* PCLK is the same as CCLK */

PCLKSEL1 = 0x55555555;

SYS_GPIOResetInit();

}
.