簡(jiǎn)單記錄LPC1788學(xué)習(xí)過(guò)程的寄存器操作---I2C學(xué)習(xí)

寄存器的直接操作可以比較直觀學(xué)習(xí)，深入了解芯片功能！

特別注意事項(xiàng)：如果使用I2C0的P0_27與P0_28時(shí)一定要加外部上拉電阻！

#include "i2c_lpc1788.h"


/*------------I2C0初始化-------------*/
void I2C0_Init(uint32_t clk, uint32_t clockrate)
{
uint32_t temp;

LPC_IOCON->P0_27=0x21;
LPC_IOCON->P0_28=0x21;//配置IO

LPC_SC->PCONP "=(1<<7);//I2C0外設(shè)時(shí)鐘開(kāi)啟

temp=clk/clockrate;//時(shí)鐘頻率分頻寄存器
LPC_I2C0->SCLH=(uint32_t)(temp/2);
LPC_I2C0->SCLL=(uint32_t)(temp-LPC_I2C0->SCLH);

LPC_I2C0->CONCLR=(1<<2)|(1<<5)|(1<<6);//清標(biāo)志位
LPC_I2C0->CONSET=(1<<6); //使能I2C0主模式
}
/*------------發(fā)送起始信號(hào)------------*/
void I2C0_Start(void)

{

uint32_t i=2000;

LPC_I2C0->CONSET=(1<<5); //發(fā)送起始信號(hào)
while((LPC_I2C0->STAT !=0x08)&&(i--)); //等待返回狀態(tài)
LPC_I2C0->CONCLR=(1<<5); //清除發(fā)送標(biāo)識(shí)
}
/*------------發(fā)送停止信號(hào)-----------*/
void I2C0_Stop(void)
{
LPC_I2C0->CONSET=(1<<4); //發(fā)送停止信號(hào)
LPC_I2C0->CONCLR=(1<<3); //復(fù)位SI信號(hào)
}
/*------------寫(xiě)8位數(shù)據(jù)----------*/
void I2C0_WriteByte(uint8_t data)
{
LPC_I2C0->DAT=data;//寫(xiě)數(shù)據(jù)
LPC_I2C0->CONCLR=(1<<3); //數(shù)據(jù)載入后復(fù)位SI信號(hào)
}
/*------------寫(xiě)地址與讀寫(xiě)模式-----------*/
void I2C0_WriteAddr(uint8_t addr,uint8_t rORw)

{

uint32_t i=2000;

I2C0_WriteByte(addr + rORw); //后一位標(biāo)識(shí)讀或者寫(xiě)
if(rORw==1)while((LPC_I2C0->STAT!=0x40)&&(i--)); //讀-返回狀態(tài)
elsewhile((LPC_I2C0->STAT!=0x18)&&(i--));//寫(xiě)-返回狀態(tài)
}
/*------------寫(xiě)數(shù)據(jù)-----------*/
void I2C0_WriteData(uint8_t data)

{

uint32_t i=2000;

I2C0_WriteByte(data);
while((LPC_I2C0->STAT!=0x28)&&(i--)); //數(shù)據(jù)寫(xiě)完成返回狀態(tài)
}
/*------------讀8位數(shù)據(jù)-----------*/
uint8_t I2C0_ReadByte(uint8_t last)

{

uint32_t i=2000;

if(last) //讀最后一位數(shù)據(jù)

{

LPC_I2C0->CONCLR=(1<<2)|(1<<3);
while((LPC_I2C0->STAT!=0x58)&&(i--));
}
else

{

i=2000;

LPC_I2C0->CONCLR=(1<<2)|(1<<3);
while((LPC_I2C0->STAT!=0x50)&&(i--));
}
return LPC_I2C0->DAT;//數(shù)據(jù)讀
}
/*------------控制PCF8574-----------*/
void WritePCF8574(uint8_t addr,uint8_t pBuffer)
{
I2C0_Start();
I2C0_WriteAddr(addr,0); //寫(xiě)地址-寫(xiě)模式
I2C0_WriteData(pBuffer); //寫(xiě)數(shù)據(jù)
I2C0_Stop();

}