i2c
bsp_i2c_ee.h
#ifndef __I2C_EE_H
#define __I2C_EE_H
#include "stm32f4xx.h"
/* AT24C01/02每页有8个字节 */
#define I2C_PageSize 8
/* AT24C04/08A/16A每页有16个字节 */
//#define I2C_PageSize 16
/* STM32 I2C 快速模式 */
#define I2C_Speed 400000
/* 这个地址只要与STM32外挂的I2C器件地址不一样即可 */
#define I2C_OWN_ADDRESS7 0X0A
/*I2C接口*/
#define EEPROM_I2C I2C1
#define EEPROM_I2C_CLK RCC_APB1Periph_I2C1
#define EEPROM_I2C_CLK_INIT RCC_APB1PeriphClockCmd
#define EEPROM_I2C_SCL_PIN GPIO_Pin_6
#define EEPROM_I2C_SCL_GPIO_PORT GPIOB
#define EEPROM_I2C_SCL_GPIO_CLK RCC_AHB1Periph_GPIOB
#define EEPROM_I2C_SCL_SOURCE GPIO_PinSource6
#define EEPROM_I2C_SCL_AF GPIO_AF_I2C1
#define EEPROM_I2C_SDA_PIN GPIO_Pin_7
#define EEPROM_I2C_SDA_GPIO_PORT GPIOB
#define EEPROM_I2C_SDA_GPIO_CLK RCC_AHB1Periph_GPIOB
#define EEPROM_I2C_SDA_SOURCE GPIO_PinSource7
#define EEPROM_I2C_SDA_AF GPIO_AF_I2C1
/*等待超出时间*/
#define I2CT_FLAG_TIMEOUT ((uint32_t)0x1000)
#define I2CT_LONG_TIMEOUT ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))
/*信息输出*/
#define EEPROM_DEBUG_ON 0
#define EEPROM_INFO(fmt,arg...) printf("<<-EEPROM-INFO->> "fmt"\n",##arg)
#define EEPROM_ERROR(fmt,arg...) printf("<<-EEPROM-ERROR->> "fmt"\n",##arg)
#define EEPROM_DEBUG(fmt,arg...) do{\
if(EEPROM_DEBUG_ON)\
printf("<<-EEPROM-DEBUG->> [%d]"fmt"\n",__LINE__, ##arg);\
}while(0)
/*
* AT24C02 2kb = 2048bit = 2048/8 B = 256 B
* 32 pages of 8 bytes each
*
* Device Address
* 1 0 1 0 A2 A1 A0 R/W
* 1 0 1 0 0 0 0 0 = 0XA0
* 1 0 1 0 0 0 0 1 = 0XA1
*/
/* EEPROM Addresses defines */
#define EEPROM_Block0_ADDRESS 0xA0 /* E2 = 0 */
//#define EEPROM_Block1_ADDRESS 0xA2 /* E2 = 0 */
//#define EEPROM_Block2_ADDRESS 0xA4 /* E2 = 0 */
//#define EEPROM_Block3_ADDRESS 0xA6 /* E2 = 0 */
void I2C_EE_Init(void);
void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite);
uint32_t I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr);
uint32_t I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite);
uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead);
void I2C_EE_WaitEepromStandbyState(void);
#endif /* __I2C_EE_H */
bap_i2c_ee.c
#include "./i2c/bsp_i2c_ee.h"
#include "./usart/bsp_debug_usart.h"
uint16_t EEPROM_ADDRESS;
static __IO uint32_t I2CTimeout = I2CT_LONG_TIMEOUT;
static uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode);
/**
* I2C I配置
*/
static void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_Initstructure;
/*!< EEPROM_I2C Periph clock enable */
EEPROM_I2C_CLK_INIT(EEPROM_I2C_CLK, ENABLE);
/*!< EEPROM_I2C_SCL_GPIO_CLK and EEPROM_I2C_SDA_GPIO_CLK Periph clock enable */
RCC_AHB1PeriphClockCmd(EEPROM_I2C_SCL_GPIO_CLK | EEPROM_I2C_SDA_GPIO_CLK, ENABLE);
/*!< GPIO configuration */
/* Connect PXx to I2C_SCL*/
GPIO_PinAFConfig(EEPROM_I2C_SCL_GPIO_PORT, EEPROM_I2C_SCL_SOURCE, EEPROM_I2C_SCL_AF);
/* Connect PXx to I2C_SDA*/
GPIO_PinAFConfig(EEPROM_I2C_SDA_GPIO_PORT, EEPROM_I2C_SDA_SOURCE, EEPROM_I2C_SDA_AF);
/*!< configure EEPROM_I2C pins: SCL */
GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SCL_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
/*!< Configure EEPROM_I2C pins: SDA */
GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SDA_PIN;
GPIO_Init(EEPROM_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
}
/**
* I2C 工作模式配置
*/
static void I2C_Mode_Configu(void)
{
I2C_InitTypeDef I2C_InitStructure;
/* I2C 配置 */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; /* 高电平数据稳定，低电平数据变化，I2C时钟线的占空比 */
I2C_InitStructure.I2C_OwnAddress1 =I2C_OWN_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable ;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; /* I2C的寻址模式 */
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed; /* 通信速率 */
I2C_Init(EEPROM_I2C, &I2C_InitStructure); /* I2C初始化 */
I2C_Cmd(EEPROM_I2C, ENABLE); /* 使能I2C */
I2C_AcknowledgeConfig(EEPROM_I2C, ENABLE);
}
/**
* I2C外设（EEPROM）初始化
*/
void I2C_EE_Init(void)
{
I2C_GPIO_Config();
I2C_Mode_Configu();
/* 根据头文件中的定义选择EEPROM要写入的地址 */
#ifdef EEPROM_Block0_ADDRESS
/* 选择 EEPROM Block0 来写入 */
EEPROM_ADDRESS = EEPROM_Block0_ADDRESS;
#endif
#ifdef EEPROM_Block1_ADDRESS
EEPROM_ADDRESS = EEPROM_Block1_ADDRESS;
#endif
#ifdef EEPROM_Block2_ADDRESS
EEPROM_ADDRESS = EEPROM_Block2_ADDRESS;
#endif
#ifdef EEPROM_Block3_ADDRESS
EEPROM_ADDRESS = EEPROM_Block3_ADDRESS;
#endif
}
/**
* @brief 将缓冲区的数据写入到EEPROM中
* @param
* @arg pBuffer:缓冲区指针
* @arg WriteAddr:写地址
* @arg NumByteToWrite:写的字节数
*/
void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)
{
u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;
Addr = WriteAddr % I2C_PageSize;
count = I2C_PageSize - Addr;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
/* If WriteAddr is I2C_PageSize aligned */
if(Addr == 0)
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
while(NumOfPage--)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
I2C_EE_WaitEepromStandbyState();
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle!=0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
}
}
/* If WriteAddr is not I2C_PageSize aligned */
else
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
if(count != 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, count);
I2C_EE_WaitEepromStandbyState();
WriteAddr += count;
pBuffer += count;
}
while(NumOfPage--)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
I2C_EE_WaitEepromStandbyState();
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle != 0)
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
I2C_EE_WaitEepromStandbyState();
}
}
}
}
/**
* @brief 写一个字节到EEPROM中
* @param
* @arg pBuffer:缓冲区指针
* @arg WriteAddr:写地址
*/
uint32_t I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
/* Send STRAT condition */
I2C_GenerateSTART(EEPROM_I2C, ENABLE);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(0);
}
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(1);
}
/* Send the EEPROM's internal address to write to */
I2C_SendData(EEPROM_I2C, WriteAddr);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(2);
}
/* Send the byte to be written */
I2C_SendData(EEPROM_I2C, *pBuffer);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
}
/* Send STOP condition */
I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
return 1;
}
/**
* @brief 在EEPROM一个写循环中可以写多个字节，但一次写入的字节数不能超过EEPROM页的大小，AT24C02每页有8个字节
* @param
* @arg pBuffer:缓冲区指针
* @arg WriteAddr:写地址
* @arg NumByteToWrite:写的字节数
*/
uint32_t I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
I2CTimeout = I2CT_LONG_TIMEOUT;
while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(4);
}
/* Send START condition */
I2C_GenerateSTART(EEPROM_I2C, ENABLE);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(5);
}
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(6);
}
/* Send the EEPROM's internal address to write to */
I2C_SendData(EEPROM_I2C, WriteAddr);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while(! I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(7);
}
/* While there is data to be written */
while(NumByteToWrite--)
{
/* Send the current byte */
I2C_SendData(EEPROM_I2C, *pBuffer);
/* Point to the next byte to be written */
pBuffer++;
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while (!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(8);
}
}
/* Send STOP condition */
I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
return 1;
}
/**
* @brief 从EEPROM里面读取一块数据
* @param
* @arg pBuffer:存放从EEPROM中读取的数据的缓冲区指针
* @arg WriteAddr:接收数据的EEPROM的地址
* @arg NumByteToWrite:要读取的字节数
*/
uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
I2CTimeout = I2CT_LONG_TIMEOUT;
//*((u8 *)0x4001080c) |=0x80;
while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(9);
}
/* Send START condition */
I2C_GenerateSTART(EEPROM_I2C, ENABLE);
//*((u8 *)0x4001080c) &=~0x80;
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(10);
}
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(11);
}
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(EEPROM_I2C, ENABLE);
/* Send the EEPROM's internal address to write to */
I2C_SendData(EEPROM_I2C, ReadAddr);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(12);
}
/* Send STRAT condition a second time */
I2C_GenerateSTART(EEPROM_I2C, ENABLE);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(13);
}
/* Send EEPROM address for read */
I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Receiver);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(14);
}
/* While there is data to be read */
while(NumByteToRead)
{
if(NumByteToRead == 1)
{
/* disable Acknowledgement */
I2C_AcknowledgeConfig(EEPROM_I2C, DISABLE);
/* Send STOP Condition */
I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
}
I2CTimeout = I2CT_LONG_TIMEOUT;
while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_RECEIVED)==0)
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
}
{
/* Read a byte from the device */
*pBuffer = I2C_ReceiveData(EEPROM_I2C);
/* Point to the next location where the byte read will be saved */
pBuffer++;
/* Decrement the read bytes counter */
NumByteToRead--;
}
}
/* Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig(EEPROM_I2C, ENABLE);
return 1;
}
/**
* @brief Wait for EEPROM Standby state
*/
void I2C_EE_WaitEepromStandbyState(void)
{
vu16 SR1_Tmp = 0;
do
{
/* Send START condition */
I2C_GenerateSTART(EEPROM_I2C, ENABLE);
/* Read EEPROM_I2C SR1 register */
SR1_Tmp = I2C_ReadRegister(EEPROM_I2C, I2C_Register_SR1);
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
}while(!(I2C_ReadRegister(EEPROM_I2C, I2C_Register_SR1) & 0x0002));
/* Clear AF flag */
I2C_ClearFlag(EEPROM_I2C, I2C_FLAG_AF);
/* STOP condition */
I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
}
/**
* @brief Basic management of the timeout situation.
* @param errorCode：错误代码，可以用来定义哪个环节出错
* @retval 返回0，表示I2C读取失败
*/
static uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode)
{
/* Block communication and all processes */
EEPROM_ERROR("I2C 等待超时!errorCode = %d",errorCode);
return 0;
}
/*********************************************END OF FILE**********************/
相关阅读
1.线性回归 1.1模型 1.1.1目标函数（损失函数、正则） a.无正则：最小二乘线性回归（OLS） b.L2正则：岭回归（Ridge Regression） c.L1正则：Lass
文章转载自：点击打开链接 本篇主要介绍PCI和PCIe的软件界面和UEFI对PCI的支持。 PCI/PCIe软件界面 1。配置空间 PCI spec规定
一、Web3j入门 以太坊推出了web3.js的nodejs库，但是对于学Java出身的而言非常的不习惯，在github中寻找到了Java版本的web3j。轻量
文章梳理了学习大数据挖掘分析的思路与步骤，给大家提供一些参考，希望能够对你有所帮助。最近有很多人咨询，想学习大数据，但不知道怎么
https://blog.csdn.net/libing1991_/article/details/53455243 前言 工作快一年，Android完全靠自学，看着那些基础教程一步步去做，