464 lines
9.8 KiB
C
464 lines
9.8 KiB
C
#include "24cxx.h"
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#include "bsp_i2c_gpio.h"
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#include "led.h"
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//初始化IIC
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void ee_Init(void)
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{
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bsp_InitI2C();
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}
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//在AT24CXX指定地址读取一个数据
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//ReadAddr :开始读数的地址
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//返回值 ：读取到的数据
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u8 ee_ReadOneByte(u16 ReadAddr)
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{
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u8 temp = 0;
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IIC_Start();
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if (EE_TYPE > AT24C16) {
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IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_WR);//发送写命令
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IIC_Wait_Ack();
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IIC_Send_Byte(ReadAddr / 256); //发送高地址
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} else IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_WR + ((ReadAddr / 256) << 1)); //发送器件地址0xA0,写数据
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IIC_Wait_Ack();
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IIC_Send_Byte(ReadAddr % 256); //发送低地址
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IIC_Wait_Ack();
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IIC_Start();
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if (1)IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_RD); //进入接收模式
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else IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_RD + ((ReadAddr / 256) << 1)); //进入接收模式
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IIC_Wait_Ack();
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temp = IIC_Read_Byte(1);
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IIC_Stop();//产生一个停止条件
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return temp;
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}
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//在AT24CXX指定地址写一个数据
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//WriteAddr:写入数据的目的地址
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//data :要写入的数据
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void ee_WriteOneByte(u16 WriteAddr, u8 data)
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{
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IIC_Start();
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if (EE_TYPE > AT24C16) {
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IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_WR);
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IIC_Wait_Ack();
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IIC_Send_Byte(WriteAddr / 256); //发送高地址
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} else IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_WR + ((WriteAddr / 256) << 1));
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IIC_Wait_Ack();
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IIC_Send_Byte(WriteAddr % 256); //发送低地址
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IIC_Wait_Ack();
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IIC_Send_Byte(data);
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IIC_Wait_Ack();
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IIC_Stop();//产生一个停止条件
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Delay_MS(6);
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}
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#if 1
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//向EEPROM写入多个字节
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uint8_t ee_WriteBytes(uint8_t *_pWriteBuf, uint16_t _usAddress, uint16_t _usSize)
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{
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uint16_t i, m;
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uint16_t addr;
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addr = _usAddress;
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for (i = 0; i < _usSize; i++) {
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//当第一次或者地址对齐到8就要重新发起起始信号和EEPROM地址
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//为了解决8地址对齐问题
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if (i == 0 || (addr % EE_PAGE_SIZE) == 0) {
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if (i != 0) {
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IIC_Stop();
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Delay_MS(6);
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}
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//发送起始地址
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IIC_Start();
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//发送设备写地址
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if (EE_TYPE > AT24C16) {
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IIC_Send_Byte(EE_DEV_ADDR|EEPROM_I2C_WR);
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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IIC_Send_Byte(addr / 256); //发送高地址
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} else IIC_Send_Byte((EE_DEV_ADDR + ((addr / 256) << 1)) | EEPROM_I2C_WR);
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//等待从机应答
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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//EEPROM应答后发送EEPROM的内部存储器地址
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IIC_Send_Byte((uint8_t)addr);
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//等待从机应答
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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}
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//发送数据
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IIC_Send_Byte(_pWriteBuf[i]);
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//等待应答
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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//写入地址加1
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addr++;
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}
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IIC_Stop();
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return 1;
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cmd_fail:
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IIC_Stop();
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return 0;
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}
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uint8_t ee_ReadBytes(uint8_t *_pReadBuf, uint16_t _usAddress, uint16_t _usSize)
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{
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uint16_t i;
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//发送起始地址
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IIC_Start();
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//发送设备写地址
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if (EE_TYPE > AT24C16) {
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IIC_Send_Byte(EE_DEV_ADDR);
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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IIC_Send_Byte(_usAddress / 256); //发送高地址
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} else IIC_Send_Byte((EE_DEV_ADDR + ((_usAddress / 256) << 1)) | EEPROM_I2C_WR);
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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IIC_Send_Byte((uint8_t)_usAddress);
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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IIC_Start();
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if (EE_TYPE > AT24C16) IIC_Send_Byte(EE_DEV_ADDR | EEPROM_I2C_RD);
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else IIC_Send_Byte((EE_DEV_ADDR + ((_usAddress / 256) << 1)) | EEPROM_I2C_RD);
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if (IIC_Wait_Ack() != 0) {
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goto cmd_fail;
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}
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for (i = 0; i < _usSize; i++) {
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/* 每读完1个字节后，需要发送Ack， 最后一个字节不需要Ack，发Nack */
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_pReadBuf[i] = IIC_Read_Byte(i != _usSize - 1?1:0);
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}
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IIC_Stop();
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return 1;
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cmd_fail:
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IIC_Stop();
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return 0;
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}
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#endif
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#if 0
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static void IIC1_Start(void); //发送起始信号
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static void IIC1_Stop(void); //发送停止信号
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static void IIC1_Write_Byte(u8 dat);//发送一个字节
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static u8 IIC1_Read_Byte(unsigned char ack);//接收一个字节
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static u8 IIC1_Wait_Ack(void);//等待ACK信号
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static void IIC1_Ack(void);//发送ACK信号
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static void IIC1_NAck(void);//不发送ACK信号
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void I2C_delay(uint16_t n)
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{
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u8 i = 100 * n; //这里可以优化速度 ，经测试最低到5还能写入
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while (i) {
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i--;
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}
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}
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//初始化IIC
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void AT24cxx_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); /* 打开GPIO时钟 */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; //SDA,SCL
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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IIC_SDA1;
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IIC_SCL1;
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}
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//在AT24CXX指定地址读取一个数据
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//ReadAddr :开始读数的地址
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//返回值 ：读取到的数据
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u8 AT24cxx_ReadOneByte(u16 ReadAddr)
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{
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u8 temp = 0;
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IIC1_Start();
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if (EE_TYPE > AT24C16) {
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IIC1_Write_Byte(0xa0);//发送写命令
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IIC1_Wait_Ack();
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IIC1_Write_Byte(ReadAddr / 256); //发送高地址
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} else IIC1_Write_Byte(0xa0 + ((ReadAddr / 256) << 1)); //发送器件地址0xA0,写数据
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IIC1_Wait_Ack();
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IIC1_Write_Byte(ReadAddr % 256); //发送低地址
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IIC1_Wait_Ack();
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IIC1_Start();
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if (EE_TYPE > AT24C16)IIC1_Write_Byte(0xa1); //进入接收模式
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else IIC1_Write_Byte(0xa1 + ((ReadAddr / 256) << 1)); //进入接收模式
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IIC1_Wait_Ack();
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temp = IIC1_Read_Byte(1);
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IIC1_Stop();//产生一个停止条件
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return temp;
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}
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//在AT24CXX指定地址写一个数据
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//WriteAddr:写入数据的目的地址
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//data :要写入的数据
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void AT24cxx_WriteOneByte(u16 WriteAddr, u8 data)
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{
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IIC1_Start();
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if (EE_TYPE > AT24C16) {
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IIC1_Write_Byte(0xa0);
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IIC1_Wait_Ack();
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IIC1_Write_Byte(WriteAddr / 256); //发送高地址
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} else IIC1_Write_Byte(0xa0 + ((WriteAddr / 256) << 1));
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IIC1_Wait_Ack();
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IIC1_Write_Byte(WriteAddr % 256); //发送低地址
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IIC1_Wait_Ack();
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IIC1_Write_Byte(data);
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IIC1_Wait_Ack();
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IIC1_Stop();//产生一个停止条件
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I2C_delay(2);
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}
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//在AT24CXX指定地址开始写入指定长度的数据
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//该函数用于写入16位或32位的数据
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//WriteAddr:开始写入的地址
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//data :要写入的数据
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//len :要写入数据的长度2，4
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void AT24cxx_WriteLenByte(u16 WriteAddr, u32 data, u8 len)
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{
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u8 i;
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for (i = 0; i < len; i++) {
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AT24cxx_WriteOneByte(WriteAddr + i, (data >> (8 * i)) & 0xff);
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}
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}
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//在AT24CXX指定地址开始读出指定长度的数据
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//该函数用于读出16bit或者32bit的数据.
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//ReadAddr :开始读出的地址
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//返回值 :数据
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//len :要读出数据的长度2,4
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u32 AT24cxx_ReadLenByte(u16 ReadAddr, u8 len)
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{
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u8 i;
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u32 temp = 0;
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for (i = 0; i < len; i++) {
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temp <<= 8;
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temp += AT24cxx_ReadOneByte(ReadAddr + len - i - 1);
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}
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return temp;
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}
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//在AT24CXX指定地址开始写入指定长度的数据
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//该函数用于写入指定的字节数
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//WriteAddr:开始写入的地址
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//buf :数据数组首地址
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//len :要写入数据的个数
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void AT24cxx_Write(u16 WriteAddr, u8 *buf, u16 len)
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{
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u16 i;
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for (i = 0; i < len; i++) {
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IWDG_Feed();
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AT24cxx_WriteOneByte(WriteAddr, *buf);
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WriteAddr++;
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buf++;
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}
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}
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//在AT24CXX指定地址开始读出指定长度的数据
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//该函数用于读出指定的字节数
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//ReadAddr:开始读出数据的地址
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//len :要写入数据的个数
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//buf :数据数组首地址
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void AT24cxx_Read(u16 ReadAddr, u8 *buf, u16 len)
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{
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while (len--) {
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IWDG_Feed();
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*buf++ = AT24cxx_ReadOneByte(ReadAddr++);
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}
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}
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//检查AT24CXX是否正常
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//这里用了24XX的第一个地址(0)来存储标志字.
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//返回1：检测失败
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//返回0：检查成功
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u8 AT24cxx_Check(void)
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{
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u8 temp1, temp2;
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AT24cxx_WriteOneByte(0x010, 0x55);
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temp1 = AT24cxx_ReadOneByte(0x010); //避免每次开机都写AT24CXX
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temp2 = temp1;
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if (temp2 == 0x55)return 0;
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else {
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AT24cxx_WriteOneByte(0x010, 0x55);
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temp1 = AT24cxx_ReadOneByte(0x010);
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temp2 = temp1;
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if (temp2 == 0x55)return 0;
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}
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return 1;
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}
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//产生IIC起始信号
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static void IIC1_Start(void)
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{
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IIC_SDA1;
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IIC_SCL1;
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I2C_delay(4);
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IIC_SDA0;
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I2C_delay(4);
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IIC_SCL0;
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I2C_delay(4);
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}
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//产生IIC停止信号
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static void IIC1_Stop(void)
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{
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IIC_SDA0;
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IIC_SCL1;
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I2C_delay(2);
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IIC_SDA1;
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I2C_delay(4);
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// IIC_SCL0;
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}
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//返回1，接收应答失败，返回0，接收应答成功
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static u8 IIC1_Wait_Ack(void)
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{
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u8 i;
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SDA_IN();
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IIC_SCL0;
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I2C_delay(2);
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IIC_SCL1;
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I2C_delay(2);
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while (Read_IIC_SDA()) {
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i++;
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if (i > 250) {
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IIC1_Stop();
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return 1;
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}
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}
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IIC_SCL0;
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I2C_delay(2);
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return 0;
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}
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//产生ACK应答
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static void IIC1_Ack(void)
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{
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IIC_SCL0;
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SDA_OUT();
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IIC_SDA0;
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I2C_delay(2);
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IIC_SCL1;
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I2C_delay(2);
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IIC_SCL0;
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}
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//不产生ACK应答
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static void IIC1_NAck(void)
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{
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IIC_SCL0;
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SDA_OUT();
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IIC_SDA1;
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I2C_delay(2);
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IIC_SCL1;
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I2C_delay(2);
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IIC_SCL0;
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}
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//IIC发送一个字节
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//返回从机有无应答
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//0，有应答
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//1，无应答
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void IIC1_Write_Byte(u8 dat)
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{
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u8 t;
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SDA_OUT();
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I2C_delay(2);
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for (t = 0; t < 8; t++) {
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IIC_SCL0;
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if (dat & 0x80) {
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IIC_SDA1;
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} else {
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IIC_SDA0;
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}
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I2C_delay(2);
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IIC_SCL1;
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dat <<= 1;
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I2C_delay(2);
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}
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IIC_SCL0;
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I2C_delay(2);
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}
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//读1个字节，ack=0时，发送ACK,ack=1，发送NACK
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u8 IIC1_Read_Byte(unsigned char ack)
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{
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u8 i, receive;
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SDA_IN();//SDA设为输入
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IIC_SDA0;
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I2C_delay(2);
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for (i = 0; i < 8; i++) {
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IIC_SCL0;
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I2C_delay(2);
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IIC_SCL1;
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receive <<= 1;
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I2C_delay(2);
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if (Read_IIC_SDA())receive++;
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I2C_delay(2);
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}
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IIC_SDA1;
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I2C_delay(2);
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IIC_SCL0;
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I2C_delay(2);
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if (!ack)
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IIC1_Ack();
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else
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IIC1_NAck();
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return receive;
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}
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#endif
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