?? i2c.c
字號:
/*這個文件將設置存儲芯片信息，現在采用24C64芯片*/
#include "i2c.h"
#include <stdio.h>
u16 EEPROM_ADDRESS;
/*配置I2C1所在的GPIO管腳*/
void I2C_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE); //重映像到PB8(SCL)，PB9(SDA)
/*GPIOB和I2C1使用不同的時鐘總線，即APB2和APB1*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
/*配置SCL和SDA管腳*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; //復用開漏輸出
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*配置RESET管腳*///CS8416 -> I2S時鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //復用輸出
GPIO_Init(GPIOE, &GPIO_InitStructure);
}
/*I2C功能配置*/
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
/*使能I2C1外設*/
I2C_Cmd(I2C1, ENABLE);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; /*I2C接口為I2C模式*/
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; /*快速工作模式，Tlow/Thigh=2，占空比*/
I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7; /*設備地址為從機地址，已經賦值*/
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; /*使能應答*/
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;/*應答7位地址*/
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed; /*時鐘頻率為400K*/
I2C_Init(I2C1, &I2C_InitStructure);
/*使能應答功能*/
//I2C_AcknowledgeConfig(I2C1, ENABLE);
}
/******************************************************************************
* Function Name : I2C_EE_Init
* Description : 初始化I2C接口的EEPROM外設
* Input : None
******************************************************************************/
void I2C_EE_Init()
{
I2C_GPIO_Configuration();
I2C_Configuration();
EEPROM_ADDRESS = I2C_EEPROM_ADDRESS; //指定EEPROM的地址
}
/******************************************************************************
* Function Name : I2C_EE_BufferWrite
* Description : 寫入一個字節8bit到EEPROM (向EEPROM中寫入一個byte)
* Input :
* - pData : 要寫入EEPROM的數據(一字節8位)
* - WriteAddr : EEPROM的內部地址.
* ( - pBuffer : 指向包含要寫入EEPROM的數據的緩沖區 )
******************************************************************************/
//void I2C_EE_ByteWrite(u8* pBuffer, u16 WriteAddr)
void I2C_EE_ByteWrite(u8 pData, u16 WriteAddr)
{
__IO uint32_t timedelay = 0;
/*發送開始信號*/
I2C_GenerateSTART(I2C1, ENABLE);
/* 檢查最近一次I2C事件是否是輸入的事件*/
/* Test on EV5 and clear it EV5：選擇主機模式*/
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
/*發送7位從機地址，即EEPROM在I2C上的地址*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
timedelay = 0;
/* Test on EV6 and clear it EV6：選擇主機發送模式*/
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
/* 發送EEPROM的內部地址*/
//I2C_SendData(I2C1, WriteAddr);
//下面的三條語句為新加的，24C64的地址為16位，需要分成兩次寫入
I2C_SendData(I2C1,(WriteAddr&0xff00)>>8); // 發送前8位地址
timedelay = 0;
//Test on EV8 and clear it EV8：主機8位字節已傳送
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1, (WriteAddr&0xff)); // 發送后8位地址
timedelay = 0;
/* Test on EV8 and clear it EV8：主機8位字節已傳送*/
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
/*發送要寫的數據*/
//I2C_SendData(I2C1, *pBuffer);
I2C_SendData(I2C1, pData);
timedelay = 0;
/* Test on EV8 and clear it EV8：主機8位字節已傳送*/
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
/*發送停止位*/
I2C_GenerateSTOP(I2C1, ENABLE);
}
/******************************************************************************
* Function Name : I2C_EE_WordWrite
* Description :
* Input :
* - pData : 要寫入EEPROM的數據(兩字節16位)
* - WriteAddr : EEPROM的內部地址.
******************************************************************************/
void I2C_EE_WordWrite(u16 pData, u16 WriteAddr)
{
__IO uint32_t timedelay = 0;
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1,(WriteAddr & 0xff00)>>8);//發送前8位地址
timedelay = 0;
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1,(WriteAddr & 0xff)); //發送后8位地址
timedelay = 0;
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1, (pData & 0xFF00)>>8); //發送高8位數據
timedelay = 0;
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1, (pData & 0xFF)); //發送低8位數據
timedelay = 0;
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_GenerateSTOP(I2C1, ENABLE);
}
/******************************************************************************
* Function Name : I2C_ByteWrite
* Description :
* Input :
* - Addr_device : 從器件地址
* - Addr_data : 數據的內部地址
* - data : 要寫入的數據
******************************************************************************/
//void I2C_ByteWrite(u8* pBuffer, u8 WriteAddr)
void I2C_ByteWrite(u8 Addr_device,u8 Addr_data,u8 data)
{
__IO uint32_t timedelay = 0;
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
//發送7位從機地址
I2C_Send7bitAddress(I2C1, Addr_device, I2C_Direction_Transmitter);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
//發送數據的內部地址
I2C_SendData(I2C1, Addr_data);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
//發送要寫的數據
I2C_SendData(I2C1, data);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_GenerateSTOP(I2C1, ENABLE);
}
/******************************************************************************
* Function Name : I2C_EE_ClearWrite
* Description : 清零一塊區域
* : 清空區域的字節個數不能大于頁面大小
* Input :
* - WriteAddr : EEPROM的內部地址
* - NumByteToWrite : 要寫的字節個數，不能超過255
******************************************************************************/
void I2C_EE_ClearWrite(u16 WriteAddr, u8 NumByteToWrite)
{
__IO uint32_t timedelay = 0;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_GenerateSTART(I2C1, ENABLE);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1,(WriteAddr & 0xff00)>>8);//發送前8位地址
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
I2C_SendData(I2C1,(WriteAddr & 0xff)); //發送后8位地址
timedelay = 0;
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timedelay++;
if(timedelay > I2C_DELAY_TIME)return;
}
while(NumByteToWrite--)
{
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -