【AT-START-L021测评】+25LC040读写
代码：#include "at32l021_board.h"
#include "at32l021_clock.h"
#include "OLED.h"
/** @addtogroup AT32L021_periph_examples
* @{
*/
#define uint unsigned int
#define u8unsigned char
#define READ_INSTRUCTION0x03 // ???(??25LC040,????????????)
#define WRITE_INSTRUCTION 0x02 // ???(??,??????????)
#define WREN_INSTRUCTION0x06 // ?????
unsigned char readData,readData1,readData2;
void _nop_(void)
{
int i;
for(i=0;i<20;i++);
}
void SPI_Init(void) {
// ???SPI??,????????
}
void SPI_SendByte(unsigned char byte) {
// ??SPI??????
u8 i;
for(i=0;i<8;i++)
{
//SCK=0;
at32_lc040_off(SCK1);
_nop_();
_nop_();
if((byte&0x80)==0x80)
at32_lc040_on(SI);
else
at32_lc040_off(SI);
_nop_();
_nop_();
byte<<=1;
//SCK=1;
at32_lc040_on(SCK1);
_nop_();
_nop_();
}
}
u8 SPI_SendByte1(unsigned char byte) {
// ??SPI??????
u8 i,date=0;
for(i=0;i<8;i++)
{
date<<=1;
//SCK=0;
at32_lc040_off(SCK1);
_nop_();
_nop_();
if((byte&0x80)==0x80)
at32_lc040_on(SI);
else
at32_lc040_off(SI);
_nop_();
_nop_();
byte<<=1;
//SCK=1;
at32_lc040_on(SCK1);
_nop_();
_nop_();
//SO=1;
if(at32_soin_state())
date|=1;
}
return date;
}
unsigned char SPI_ReceiveByte(void) {
// ??SPI??????
u8 i,dat=0;
for(i=0;i<8;i++)
{
dat<<=1;
//SCK=1; //第一位
at32_lc040_on(SCK1);
_nop_();
_nop_();
//SCK=0;
at32_lc040_off(SCK1);
_nop_();
_nop_();
//SO=1;
if(at32_soin_state())
dat|=1;
_nop_();
_nop_();
}
return dat; // ??????????????
}
void SPI_CS_Low(void) {
// ???????
//CS = 0; // ?????????P1.0??
at32_lc040_off(CS1);
}
void SPI_CS_High(void) {
// ???????
//CS = 1; // ?????????P1.0??
at32_lc040_on(CS1);
}
// ????
void EEPROM_WriteByte(unsigned char address, unsigned char date) {
SPI_CS_Low(); // ??????
SPI_SendByte(WREN_INSTRUCTION); // ???????
SPI_CS_High(); // ??????,???????(??????)
SPI_CS_Low(); // ????????
SPI_SendByte(WRITE_INSTRUCTION); // ?????
//SPI_SendByte((address >> 8) & 0xFF); // ???????(??25LC040,?????)
SPI_SendByte(address); // ???????
SPI_SendByte(date); // ????
SPI_CS_High(); // ??????,?????
// ???????????,?????EEPROM????
}
unsigned char EEPROM_ReadByte(unsigned char address) {
unsigned char date;
SPI_CS_Low(); // ??????
SPI_SendByte(READ_INSTRUCTION); // ?????
//SPI_SendByte((address >> 8) & 0xFF); // ???????(??25LC040,?????)
SPI_SendByte(address ); // ???????
date = SPI_SendByte1(0 ); // ????
SPI_CS_High(); // ??????,?????
return date;
}
void EEPROM_ReadByte1(unsigned char address) {
//unsigned char date;
SPI_CS_Low(); // ??????
SPI_SendByte(READ_INSTRUCTION); // ?????
//SPI_SendByte((address >> 8) & 0xFF); // ???????(??25LC040,?????)
SPI_SendByte(address ); // ???????
readData = SPI_ReceiveByte(); // ????
readData1 = SPI_ReceiveByte();
readData2 = SPI_ReceiveByte();
SPI_CS_High(); // ??????,?????
// return date;
}
void MS_delay(uint MS)
{
uint x,y;
for(y=MS;y>0;y--)
{
for(x=796;x>0;x--);
}
}
/** @addtogroup 021_GPIO_led_toggle GPIO_led_toggle
* @{
*/
/**
* @briefmain function.
* @paramnone
* @retval none
*/
int main(void)
{
u8 bai,shi,ge;
uint i=0;
system_clock_config();
at32_board_init();
LCD_Init();
LCD_CLS();
//LCD_P8x16Str(45,5,(u8*)"EASEAR");
//LCD_P6x8Str(0,7,(u8*)"www.holteksupport.com");
//Draw_BMP(0,0,100,3,(u8*)Dot);
SPI_Init(); // ???SPI??
// ??:?????EEPROM
EEPROM_WriteByte(0x00, 169); // ???0x0000??0xAB
for(i=0;i<30000;i++);
EEPROM_WriteByte(0x01, 208); // ???0x0000??0xAB
for(i=0;i<30000;i++);
EEPROM_WriteByte(0x02, 135); // ???0x0000??0xAB
for(i=0;i<30000;i++);
readData=EEPROM_ReadByte(0); // ???0x0000????
bai= readData/100+'0';
shi=readData%100/10+'0';
ge=readData%10+'0';
LCD_P8x16Char(0,0,bai);
LCD_P8x16Char(8,0,shi);
LCD_P8x16Char(16,0,ge);
readData1 = EEPROM_ReadByte(0x01); // ???0x0000????
bai= readData1/100+'0';
shi=readData1%100/10+'0';
ge=readData1%10+'0';
LCD_P8x16Char(0,2,bai);
LCD_P8x16Char(8,2,shi);
LCD_P8x16Char(16,2,ge);
_nop_();
readData2 = EEPROM_ReadByte(0x02); // ???0x0000????
bai= readData2/100+'0';
shi=readData2%100/10+'0';
ge=readData2%10+'0';
LCD_P8x16Char(0,4,bai);
LCD_P8x16Char(8,4,shi);
LCD_P8x16Char(16,4,ge);
while(1)
{
at32_led_toggle(LED2);
// at32_oled_on(SCL);
// at32_oled_on(SDA);
// at32_oled_on(RST);
// at32_oled_on(DC);
// delay_ms(10);
// at32_oled_off(SCL);
// at32_oled_off(SDA);
// at32_oled_off(RST);
// at32_oled_off(DC);
delay_ms(1000);
//at32_led_toggle(LED3);
//delay_ms(200);
///at32_led_toggle(LED4);
//delay_ms(200);
}
}
运行效果图：
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