STM32F103ZE I2C1调试手记

/******************** (C) COPYRIGHT 2007 STMicroelectronics ******************** * File Name : i2c_ee.c * Author : MCD Application Team * Date First Issued : 05/21/2007 * Description : This file provides a set of functions needed to manage the * communication between I2C peripheral and I2C M24C08 EEPROM. ******************************************************************************** * History: * 01/03/2013: V0.3 jumshine ******************************************************************************* * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "i2c_ee.h" #include "Usart.h" /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ #define I2C_DEBUG #define SCL_PIN GPIO_Pin_6 #define SDA_PIN GPIO_Pin_7 #define I2C1_PORT GPIOB #define SET_I2C_CLK_HIGH GPIO_WriteBit(I2C1_PORT,SCL_PIN,Bit_SET) #define SET_I2C_CLK_LOW GPIO_WriteBit(I2C1_PORT,SCL_PIN,Bit_RESET) #define SET_I2C_DATA_HIGH GPIO_WriteBit(I2C1_PORT,SDA_PIN,Bit_SET) #define SET_I2C_DATA_LOW GPIO_WriteBit(I2C1_PORT,SDA_PIN,Bit_RESET) #define GET_I2C_DATA_BIT GPIO_ReadInputDataBit(I2C1_PORT, SDA_PIN) #define GET_I2C_SCL_BIT GPIO_ReadInputDataBit(I2C1_PORT, SCL_PIN) u16 EEPROM_ADDRESS; u16 EEPROM_BlockNumber=BlockNumber; u32 EEPROM_MemorySize=MemorySize; u16 EEPROM_SUB_ADDRESS=SUB_ADDRESS; #define Device_Read 0x01 #define Delay5us 2 #define Delay10us 5 #define Delay20us 10 static void I2C_delay(unsigned int us) { uint8 i2d; while(us--) for(i2d=0;i2d<10;i2d++); } extern int GetSysTick(); extern int SYS_Tick; static void Delay_IIC(int ms); static void Delay_IIC(int ms) { int a; SYS_Tick=0; for(a=0;a<ms;) { a=GetSysTick(); } } void SET_I2C_DATA_INPUT(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Configure I2C1 pins: SCL and SDA */ GPIO_InitStructure.GPIO_Pin = SDA_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); } void SET_I2C_DATA_OUTPUT(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Configure I2C1 pins: SCL and SDA */ GPIO_InitStructure.GPIO_Pin = SDA_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOB, &GPIO_InitStructure); } void SET_I2C_CLK_Input(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Configure I2C1 pins: SCL and SDA */ GPIO_InitStructure.GPIO_Pin = SCL_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); } void SET_I2C_CLK_OUTPUT(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Configure I2C1 pins: SCL and SDA */ GPIO_InitStructure.GPIO_Pin = SCL_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOB, &GPIO_InitStructure); } void I2C_Start(void) { SET_I2C_CLK_OUTPUT(); //Set I2C CLK pin as output SET_I2C_DATA_OUTPUT(); //Set I2C DATA pin as output SET_I2C_DATA_HIGH; //I2C DATA pin output high(1) SET_I2C_CLK_HIGH; //I2C CLK pin output high(1) I2C_delay(Delay20us); //Delay 20uS SET_I2C_DATA_LOW; //I2C DATA pin output low(0) I2C_delay(Delay10us); //Delay 10uS SET_I2C_CLK_LOW; //I2C CLK pin output low(0) I2C_delay(Delay10us); //Delay 10uS } void IIC_Stop (void) { //I2C Stop signal generation: Data pin rises up when clock in is high I2C_delay(Delay20us); //Delay 10uS SET_I2C_CLK_HIGH; //I2C CLK pin output high(1) I2C_delay(Delay20us); //Delay 10uS SET_I2C_DATA_HIGH; //I2C DATA pin output high(1) } void IIC_RepeatedStart(void) { //I2C Repeat Start signal generation: Data pin falls down when clock is high I2C_delay(Delay20us); //Delay 20uS I2C_delay(Delay20us); //Delay 20uS SET_I2C_DATA_HIGH; //I2C DATA pin output high(1) I2C_delay(Delay10us); //Delay 10uS SET_I2C_CLK_HIGH; //I2C CLK pin output high(1) I2C_delay(Delay20us); //Delay 20uS I2C_delay(Delay20us); //Delay 20uS SET_I2C_DATA_LOW; //I2C DATA pin output low(0) I2C_delay(Delay10us); //Delay 10uS SET_I2C_CLK_LOW; //I2C CLK pin output low(0) I2C_delay(Delay10us); //Delay 10uS } void IIC_OneClk(void) { //I2C CLK pin output one clock: CLK pin rises up before falls down I2C_delay(Delay10us); SET_I2C_CLK_HIGH; //I2C CLK pin output high(1) I2C_delay(Delay10us); //Delay 10uS SET_I2C_CLK_LOW; //I2C CLK pin output low(0) I2C_delay(Delay10us); } void IIC_SendByte(uint8 sData) { //I2C send one byte out uint8 i; for (i=0; i<8; i++)//Loop 8 times to send 8 bits { if (sData&0x80) //Judge output 1 or 0 SET_I2C_DATA_HIGH; //I2C DATA pin output high(1) if output 1 else SET_I2C_DATA_LOW; //I2C DATA pin output low(0) if output 0 sData=sData<<1; IIC_OneClk(); //Output one clock pulse after data pin is ready } } uint8 IIC_ChkAck(void) { //Check I2C Acknowledgement signal SET_I2C_DATA_INPUT(); //Set I2C DATA pin as input I2C_delay(Delay20us); //Delay 5uS SET_I2C_CLK_HIGH; //I2C CLK pin output high(1) I2C_delay(Delay10us); //Delay 5uS again if (GET_I2C_DATA_BIT) { //Read I2C DATA pin I2C_delay(Delay5us); //Delay 5uS SET_I2C_CLK_LOW; //I2C CLK pin output low(0) I2C_delay(Delay5us); //Delay 5us again SET_I2C_DATA_OUTPUT(); //Set I2C DATA pin as output SET_I2C_DATA_LOW; //I2C DATA pin output low(0) return 1; //Return 1 if read 1 from I2C DATA pin } else { //If I2C DATA pin is invalid for acknowledgement signal I2C_delay(Delay10us); //Delay 5uS SET_I2C_CLK_LOW; //I2C CLK pin output low(0) I2C_delay(Delay10us); //Delay 5uS again SET_I2C_DATA_OUTPUT(); //Set I2C DATA pin as output SET_I2C_DATA_LOW; //I2C DATA pin output low(0) return 0; //Return 0 if read 0 from I2C DATA pin } } uint8 IIC_ReadByteACK(void) { //Read one byte and send an acknowledgement signal uint8 i; uint8 data; SET_I2C_DATA_INPUT(); //Set I2C DATA pin as input I2C_delay(Delay10us); //Delay 5uS data = 0; //Prepare to receive data for (i=0; i<8 ;i++) { data=data<<1; if (GET_I2C_DATA_BIT) data |= 0x01; //If read a 1, set to data bit else data |= 0x00; //If read a 1, set to data bit IIC_OneClk(); } //Output one clock pu