一个稳定可靠的stm3 ic程序.docx
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一个稳定可靠的stm3ic程序
/*********************************************************************
File:
i2c.h
Purpose:
**********************************************************************/
#ifndef__I2C_H__
#define__I2C_H__
/******************************Includes*****************************/
/******************************Defines*******************************/
#defineSENSORS_I2CI2C2
#defineI2C_SPEED400000
#defineI2C_OWN_ADDRESS0x00
#defineI2C_Config（）I2cMaster_Init（）;
/*****************************Prototypes*****************************/
voidI2cMaster_Init（void）;
unsignedlongSensors_I2C_WriteRegister（unsignedcharAddress,unsignedcharRegisterAddr,unsignedshortRegisterLen,constunsignedchar*RegisterValue）;
unsignedlongSensors_I2C_ReadRegister（unsignedcharAddress,unsignedcharRegisterAddr,unsignedshortRegisterLen,unsignedchar*RegisterValue）;
intSensors_I2C_WriteRegister_swap（unsignedcharslave_addr,unsignedcharreg_addr,unsignedcharlen,unsignedchar*data_ptr）;
intSensors_I2C_ReadRegister_swap（unsignedcharslave_addr,unsignedcharreg_addr,unsignedcharlen,unsignedchar*data_ptr）;
intI2C_Reset_User（）;
#endif//__I2C_H__
/*******************************************************************************
File:
i2c.c
Purpose:
I2c3tocommunicatewiththesensors
Author:
**********************************Includes***********************************/
#include
#include"stm32l1xx.h"
#include"i2c.h"
#include"gpio.h"
#include"log.h"
#include"discover_board.h"
#include"main.h"
/*********************************Defines************************************/
#defineI2Cx_FLAG_TIMEOUT（（uint32_t）900）
#defineI2Cx_LONG_TIMEOUT（（uint32_t）（300*I2Cx_FLAG_TIMEOUT））
#defineSENSORS_I2C_SCL_GPIO_PORTGPIOB
#defineSENSORS_I2C_SCL_GPIO_CLKRCC_AHBPeriph_GPIOB
#defineSENSORS_I2C_SCL_GPIO_PINGPIO_Pin_10
#defineSENSORS_I2C_SCL_GPIO_PINSOURCEGPIO_PinSource10
#defineSENSORS_I2C_SDA_GPIO_PORTGPIOB
#defineSENSORS_I2C_SDA_GPIO_CLKRCC_AHBPeriph_GPIOB
#defineSENSORS_I2C_SDA_GPIO_PINGPIO_Pin_11
#defineSENSORS_I2C_SDA_GPIO_PINSOURCEGPIO_PinSource11
#defineSENSORS_I2C_RCC_CLKRCC_APB1Periph_I2C2
#defineSENSORS_I2C_AFGPIO_AF_I2C2
#defineWAIT_FOR_FLAG（flag,value,timeout,errorcode）I2CTimeout=timeout;\
while（I2C_GetFlagStatus（SENSORS_I2C,flag）!
=value）{\
if（（I2CTimeout--）==0）returnI2Cx_TIMEOUT_UserCallback（errorcode）;\
}\
#defineCLEAR_ADDR_BITI2C_ReadRegister（SENSORS_I2C,I2C_Register_SR1）;\
I2C_ReadRegister（SENSORS_I2C,I2C_Register_SR2）;\
/*********************************Globals************************************/
/*********************************Prototypes*********************************/
/*******************************Function************************************/
staticuint32_tI2Cx_TIMEOUT_UserCallback（charvalue）;
voidI2cMaster_Init（void）
{
GPIO_InitTypeDefGPIO_InitStructure;
I2C_InitTypeDefI2C_InitStructure;
/*EnableI2Cxclock*/
RCC_APB1PeriphClockCmd（SENSORS_I2C_RCC_CLK,ENABLE）;
/*EnableI2CGPIOclock*/
RCC_AHBPeriphClockCmd（SENSORS_I2C_SCL_GPIO_CLK|SENSORS_I2C_SDA_GPIO_CLK,ENABLE）;
/*ConfigureI2Cxpin:
SCL----------------------------------------*/
GPIO_InitStructure.GPIO_Pin=SENSORS_I2C_SCL_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_OType=GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
/*ConnectpinstoPeriph*/
GPIO_PinAFConfig（SENSORS_I2C_SCL_GPIO_PORT,SENSORS_I2C_SCL_GPIO_PINSOURCE,SENSORS_I2C_AF）;
GPIO_Init（SENSORS_I2C_SCL_GPIO_PORT,&GPIO_InitStructure）;
/*ConfigureI2Cxpin:
SDA----------------------------------------*/
GPIO_InitStructure.GPIO_Pin=SENSORS_I2C_SDA_GPIO_PIN;
/*ConnectpinstoPeriph*/
GPIO_PinAFConfig（SENSORS_I2C_SDA_GPIO_PORT,SENSORS_I2C_SDA_GPIO_PINSOURCE,SENSORS_I2C_AF）;
GPIO_Init（SENSORS_I2C_SDA_GPIO_PORT,&GPIO_InitStructure）;
I2C_DeInit（SENSORS_I2C）;
I2C_InitStructure.I2C_Mode=I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle=I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1=I2C_OWN_ADDRESS;
I2C_InitStructure.I2C_Ack=I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed=I2C_SPEED;
/*EnabletheI2Cperipheral*/
I2C_Cmd（SENSORS_I2C,ENABLE）;
/*InitializetheI2Cperipheral*/
I2C_Init（SENSORS_I2C,&I2C_InitStructure）;
}
/**
*@briefBasicmanagementofthetimeoutsituation.
*@paramNone.
*@retvalNone.
*/
staticuint32_tI2Cx_TIMEOUT_UserCallback（charvalue）
{
/*ThefollowingcodeallowsI2Cerrorrecoveryandreturntonormalcommunication
iftheerrorsourcedoesn'tstillexist（ie.hardwareissue..）*/
I2C_InitTypeDefI2C_InitStructure;
I2C_GenerateSTOP（SENSORS_I2C,ENABLE）;
I2C_SoftwareResetCmd（SENSORS_I2C,ENABLE）;
I2C_SoftwareResetCmd（SENSORS_I2C,DISABLE）;
I2C_DeInit（SENSORS_I2C）;
I2C_InitStructure.I2C_Mode=I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle=I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1=I2C_OWN_ADDRESS;
I2C_InitStructure.I2C_Ack=I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed=I2C_SPEED;
/*EnabletheI2Cperipheral*/
I2C_Cmd（SENSORS_I2C,ENABLE）;
/*InitializetheI2Cperipheral*/
I2C_Init（SENSORS_I2C,&I2C_InitStructure）;
#ifdefUser_debug
MPL_LOGI（"I2CRestarted.\n"）;
#endif
return1;
}
intI2C_Reset_User（）
{
returnI2Cx_TIMEOUT_UserCallback（0）;
}
/**
*@briefWritesaBytetoagivenregistertothesensorsthroughthe
controlinterface（I2C）
*@paramRegisterAddr:
Theaddress（location）oftheregistertobewritten.
*@paramRegisterValue:
theBytevaluetobewrittenintodestinationregister.
*@retval0ifcorrectcommunication,elsewrongcommunication
*/
unsignedlongSensors_I2C_WriteRegister（unsignedcharAddress,unsignedcharRegisterAddr,unsignedshortRegisterLen,constunsignedchar*RegisterValue）
{
uint32_tresult=0;
uint32_ti=RegisterLen;
__IOuint32_tI2CTimeout=I2Cx_LONG_TIMEOUT;
//RegisterValue=RegisterValue+（RegisterLen-1）;
/*Waitforthebusyflagtobecleared*/
WAIT_FOR_FLAG（I2C_FLAG_BUSY,RESET,I2Cx_LONG_TIMEOUT,1）;
/*Starttheconfigsequence*/
I2C_GenerateSTART（SENSORS_I2C,ENABLE）;
/*Waitforthestartbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_SB,SET,I2Cx_FLAG_TIMEOUT,2）;
/*Transmittheslaveaddressandenablewritingoperation*/
I2C_Send7bitAddress（SENSORS_I2C,（Address<<1）,I2C_Direction_Transmitter）;
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_ADDR,SET,I2Cx_FLAG_TIMEOUT,3）;
/*cleartheADDRinterruptbit-thisisdonebyreadingSR1andSR2*/
CLEAR_ADDR_BIT
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_TXE,SET,I2Cx_FLAG_TIMEOUT,4）;
/*Transmitthefirstaddressforwriteoperation*/
I2C_SendData（SENSORS_I2C,RegisterAddr）;
while（i--）
{
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_TXE,SET,I2Cx_FLAG_TIMEOUT,5）;
/*Preparetheregistervaluetobesent*/
//I2C_SendData（SENSORS_I2C,*RegisterValue--）;
I2C_SendData（SENSORS_I2C,*RegisterValue++）;
}
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_BTF,SET,I2Cx_FLAG_TIMEOUT,6）;
/*Endtheconfigurationsequence*/
I2C_GenerateSTOP（SENSORS_I2C,ENABLE）;
/*Returntheverifyingvalue:
0（Passed）or1（Failed）*/
returnresult;
}
unsignedlongSensors_I2C_ReadRegister（unsignedcharAddress,unsignedcharRegisterAddr,unsignedshortRegisterLen,unsignedchar*RegisterValue）
{
uint32_tresult=0;
uint8_tbytesRemaining=RegisterLen;
__IOuint32_tI2CTimeout=I2Cx_LONG_TIMEOUT;
/*Waitforthebusyflagtobecleared*/
WAIT_FOR_FLAG（I2C_FLAG_BUSY,RESET,I2Cx_LONG_TIMEOUT,7）;
/*Starttheconfigsequence*/
I2C_GenerateSTART（SENSORS_I2C,ENABLE）;
/*Waitforthestartbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_SB,SET,I2Cx_FLAG_TIMEOUT,8）;
/*Transmittheslaveaddressandenablewritingoperation*/
I2C_Send7bitAddress（SENSORS_I2C,（Address<<1）,I2C_Direction_Transmitter）;
/*Waitforthestartbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_ADDR,SET,I2Cx_FLAG_TIMEOUT,9）;
/*cleartheADDRinterruptbit-thisisdonebyreadingSR1andSR2*/
CLEAR_ADDR_BIT;
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_TXE,SET,I2Cx_FLAG_TIMEOUT,10）;
/*Transmittheregisteraddresstoberead*/
I2C_SendData（SENSORS_I2C,RegisterAddr）;
/*Waitforaddressbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_TXE,SET,I2Cx_FLAG_TIMEOUT,11）;
/*!
I2C_GenerateSTART（SENSORS_I2C,ENABLE）;
/*Waitforthestartbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_SB,SET,I2Cx_FLAG_TIMEOUT,12）;
/*!
I2C_Send7bitAddress（SENSORS_I2C,（Address<<1）,I2C_Direction_Receiver）;
/*Waitforthestartbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_ADDR,SET,I2Cx_FLAG_TIMEOUT,13）;
if（RegisterLen==1）{
/*!
I2C_AcknowledgeConfig（SENSORS_I2C,DISABLE）;
/*cleartheADDRinterruptbit-thisisdonebyreadingSR1andSR2*/
CLEAR_ADDR_BIT;
/*!
I2C_GenerateSTOP（SENSORS_I2C,ENABLE）;
/*WaitfortheRXNEbittobeset*/
WAIT_FOR_FLAG（I2C_FLAG_RXNE,SET,I2Cx_FLAG_TIMEOUT,14）;
//bytesRemaining--;
//RegisterValue[bytesRemaining]=I2C_ReceiveData（SENSORS_I2C）;
RegisterValue[0]=I2C_ReceiveData（SENSORS_I2C）;
}elseif（RegisterLen==2）{
/*!
I2C_AcknowledgeConfig（SENSORS_I2C,DISABLE）;
/*SetPOSbit*/
SENSORS_I2C->CR1|=
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