at45db041.c

我写的针对lpc2141的ucos源码

#include <LPC214X.H>
#include "type.h"
#include "irq.h"
#include "ssp.h"
#include "at45db041.h"

uint8 timeout;

uint8 spi1_init()
{
	uint8 index;

	uint16 dummy;

	timeout=0;

	//SSPCR1 = SSPCR1_LBM;

#if USE_CS
    PINSEL1 |= 0x02A8;
#else
    PINSEL1 |= 0x00A8;
    IODIR0 |= SPI1_SEL;	/* SSEL is output */
    IOSET0 |= SPI1_SEL;	/* set SSEL to high */
#endif

	SSPCR0 = 0x07 |1<<6 |1<<7|99<<8;
	SSPCPSR = 0x12; 
	
	if ( install_irq( SPI1_INT, (void *)spi1_irq_handle ) == FALSE ){
		return (FALSE);
    }

	for(index=0;index<8;index++) dummy=SSPDR;
		
	SSPCR1 = SSPCR1_SSE;
	//SSPIMSC = SSPIMSC_RTIM;
	return TRUE;
}

uint8 b1_read(uint16 offset, uint8 *buffer, uint16 length)
{
	uint16 index;
	uint8 command[5];

	sendchar('r');

	if(offset>511) return FALSE;
	
	command[0]=0xd4; //or 0xd4, see datasheet and fix me
	command[2]=(offset>>8)&0x01;
	command[3]=offset&0xff;

	IOCLR0 |= SPI1_SEL;

	for(index=0;index<5;index++) {
		while(!(SSPSR & SSPSR_TFE));
		SSPDR=command[index];
	}

	for(index=0;index<length;index++){
		sendchar('0'+index);
		while(!(SSPSR & SSPSR_RNE) && !timeout);
		if(timeout) {
			timeout=0;
			IOSET0 |= SPI1_SEL;
			return FALSE;
		}
		buffer[index]=SSPDR;
	}

	IOSET0 |= SPI1_SEL;

	return TRUE;
}

uint8 b1_write(uint16 offset, uint8 *buffer, uint16 length)
{
	uint16 index;
	uint8 command[4];

	//sendchar('w');

	if(offset>511) return FALSE;
	
	command[0]=0x84; 
	command[2]=(offset>>8)&0x01;
	command[3]=offset&0xff;

	IOCLR0 |= SPI1_SEL;
	
	for(index=0;index<4;index++){
		while(!(SSPSR & SSPSR_TFE)); 
		SSPDR=command[index];
	}
	for(index=0;index<length;index++){
		while(!(SSPSR & SSPSR_TFE));
		 SSPDR=buffer[index]; 
	}

	//while(1) SSPDR=0xaa;

	IOSET0 |= SPI1_SEL;

	return TRUE;
}

uint8 page_read(uint16 page, uint16 offset, uint8 *buffer, uint16 length) 
{
	uint16 index;
	uint8 command[4];

	if(offset>511) return FALSE;
	
	command[0]=0xd2; //0x52 or 0xd2, see datasheet and fix me
	command[1]=(page>>7)&0x0f;
	command[2]=(page<<1)&0xfe;
	command[2]|=(offset>>8)&0x01;
	command[3]=offset&0xff;

	IOCLR0 |= SPI1_SEL;

	for(index=0;index<4;index++) {
		while(!(SSPSR & SSPSR_TFE));
		SSPDR=command[index];
	}
	
	for(index=0;index<4;index++) {
		while(!(SSPSR & SSPSR_TFE));
		SSPDR=index;
	}

	for(index=0;index<length;index++){
		sendchar('0'+index);
		while(!(SSPSR & SSPSR_RNE) && !timeout);
		if(timeout) {
			timeout=0;
			IOSET0 |= SPI1_SEL;
			return FALSE;
		}
		buffer[index]=SSPDR;
	}

	IOSET0 |= SPI1_SEL;

	return TRUE;	


}

uint8 status_read()
{
	uint8 state;
	uint8 i;
	uint8 command=0xd7; //0x57 or 0xd7
	IOCLR0 |= SPI1_SEL;

	while (!(SSPSR & SSPSR_TNF));
	SSPDR=command;

	while ((SSPSR & SSPSR_BSY));

	state=SSPDR;	


	SSPDR=0xe0;
	while ((SSPSR & SSPSR_BSY));
	state=SSPDR;	
	
			
	IOSET0 |= SPI1_SEL;

	return state;
}			  


void spi1_irq_handle(void) __irq
{
	uint32 regValue;
  	sendchar('i');
    regValue = SSPMIS;
	if ( regValue & SSPMIS_RTMIS )
		timeout=1;
	SSPICR = SSPICR_RTIC;		

}