AT24C16有它的器件地址。得严格按照IIC的通讯协议来读写。我要说的是新唐的IIC比较易用,只要设好通讯数率,然后就盯着一个寄存器的一个比特就行.
这就是控制寄存器 (I2CON)
CPU可以读写这个８位寄存器，其中２位受硬件影响：SI位在I2C硬件请求中断时置位，STO位在总线出现STOP条件时被清零，当ENS1="0"时STO位也被清零
EI 使能中断
ENSI 使能I2C功能模块。当ENSI=1时I2C功能使能，SDA1和SCL1口必须被设为逻辑高
STA I2C 开始标志，设置STA=1进入主模式，当总线空闲时I2C硬件发送一个START或重复START条件到总线上
STO I2C 停止标志，在主模式中设置STO可以发送STOP条件到总线上，I2C硬件将检测总线，如果一个STOP条件被检测到，STO位被硬件自动清零。在从模式中，设置STO可以复位I2C硬件为“未赋址＂从模式，也就是已经不在从接收模式，不会再接收主发送设备的数据
SI I2C 中断标志，当新的SIO状态出现在I2STATUS寄存器中，SI标志被硬件置位，如果EA和EI 2位都被置位，将会产生I2C中断请求。SI位必须被软件写“1＂清零。
AA 应答产生控制位，当AA=1时，在地址或数据接收之前，应答位（SDA低电平）将在如下两种情况的应答时钟脉冲周期被返回：1）从机应答主机发送的地址，2)接收设备应答发送设备的数据。当AA=0时，在地址或数据接收之前，无应答位（SDA高电平）将在SCL线应答时钟脉冲周期被返回
只要盯住SI位就行。因为NUV120的IIC收发都是清它的位，收到后清它，发完后也清它。
比如：写一个字节，就判断SI位就大功告成了。
void Write_24LC64(uint32_t address,uint8_t data )
{
uint32_t u32HCLK,i;
u32HCLK = DrvSYS_GetHCLKFreq() * 1000;
//Open I2C1 and set clock = 50Kbps
DrvI2C_Open(I2C_PORT1,50000);
//send i2c start
DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0); //set start
while (I2C1->CON.SI == 0); //poll si flag
//send writer command
I2C1->DATA = 0XA0; //send writer command
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si flag
while( I2C1->CON.SI == 0 ); //poll si flag
//send address high
I2C1->DATA = (address>>8)&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send address low
I2C1->DATA = address&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send data
I2C1->DATA = data; //write data to
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send i2c stop
DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0); //send stop
//while( I2C1->CON.SI == 0 );
for(i=0;i<60;i++);
DrvI2C_Close(I2C_PORT1);
for(i=0;i<6000;i++);
for(i=0;i<6000;i++);
}
下边说我的这个IIC测试程序。非常简单就是把一个字节数0x55,往指定位置写。然后读出若对了，串口输出来。
先上效果图：
再上程序：
#include <stdio.h>
#include "NUC1xx.h"
#include "..\Driver\DrvGPIO.h"
#include "..\Driver\DrvI2C.h"
#include "..\Driver\DrvSYS.h"
#include "..\Driver\DrvUART.h"
void Write_24LC64(uint32_t address,uint8_t data )
{
uint32_t u32HCLK,i;
u32HCLK = DrvSYS_GetHCLKFreq() * 1000;
//Open I2C1 and set clock = 50Kbps
DrvI2C_Open(I2C_PORT1,50000);
//send i2c start
DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0); //set start
while (I2C1->CON.SI == 0); //poll si flag
//send writer command
I2C1->DATA = 0XA0; //send writer command
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si flag
while( I2C1->CON.SI == 0 ); //poll si flag
//send address high
I2C1->DATA = (address>>8)&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send address low
I2C1->DATA = address&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send data
I2C1->DATA = data; //write data to
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send i2c stop
DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0); //send stop
//while( I2C1->CON.SI == 0 );
for(i=0;i<60;i++);
DrvI2C_Close(I2C_PORT1);
for(i=0;i<6000;i++);
for(i=0;i<6000;i++);
}
uint8_t Read_24LC64(uint32_t address)
{
uint8_t TEMP;
uint32_t u32HCLK;
//Open I2C1 and set clock = 50Kbps
u32HCLK = DrvSYS_GetHCLKFreq() * 1000;
DrvI2C_Open(I2C_PORT1,50000);
//send i2c start
DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0); //set start
while (I2C1->CON.SI == 0); //poll si flag
//send writer command
I2C1->DATA = 0XA0;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si
while( I2C1->CON.SI == 0 ); //poll si flag
//send address high
I2C1->DATA = (address>>8)&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send address low
I2C1->DATA = address&0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si and set ack
while( I2C1->CON.SI == 0 ); //poll si flag
//send start flag
DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0); //clr si and send start
while( I2C1->CON.SI == 0 ); //poll si flag
//send read command
I2C1->DATA = 0XA1;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si
while( I2C1->CON.SI == 0 ); //poll si flag
//resive data
I2C1->DATA = 0XFF;
DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si
while( I2C1->CON.SI == 0 ); //poll si flag
TEMP= I2C1->DATA;
//send i2c stop
DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0); //clr si and set stop
DrvI2C_Close(I2C_PORT1);
return TEMP;
}
/*---------------------------------------------------------------------------------------------------------*/
/*MAIN Function*/
/*---------------------------------------------------------------------------------------------------------*/
int main (void)
{
uint8_t ddllxxrr;
uint32_t u32HCLK;
STR_UART_T sParam;
/* SYSCLK =>12Mhz*/
UNLOCKREG();
SYSCLK->;PWRCON.XTL12M_EN = 1;
u32HCLK = DrvSYS_GetHCLKFreq() * 1000;
/*
SET UART0
*/
/* Set UART0 Pin */
DrvGPIO_InitFunction(E_FUNC_UART0);
/* UART Setting */
sParam.u32BaudRate = 9600;
sParam.u8cDataBits = DRVUART_DATABITS_8;
sParam.u8cStopBits = DRVUART_STOPBITS_1;
sParam.u8cParity = DRVUART_PARITY_NONE;
sParam.u8cRxTriggerLevel = DRVUART_FIFO_1BYTES;
/* Select UART Clock Source From 12Mhz*/
DrvSYS_SelectIPClockSource(E_SYS_UART_CLKSRC, 0);
/* Set UART0 Configuration */
DrvUART_Open(UART_PORT0, &sParam);
/* Set I2C I/O */
DrvGPIO_InitFunction(E_FUNC_I2C1);
/* Open I2C0 and set clock = 100Kbps */
DrvI2C_Open(I2C_PORT1,50000);
Write_24LC64(0x00000001,0x55);
ddllxxrr= Read_24LC64(0x00000001);
if(ddllxxrr==0x55)
{
printf("the read bites is :%d\n",ddllxxrr);
}
while(1);
}
最后上工程文件：
NUCtesttestI2C.rar
(1.32 MB)
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