578 lines
14 KiB
C
578 lines
14 KiB
C
/*********************************************************************!
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* 技术讨论：QQ群 123763203
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* 官网 ：www.navota.com
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*
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* @file i2c.c
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* @brief i2c通讯接口函数库
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* @author Navota
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* @date 2017-1-1
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************************************************************************/
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#include "common.h"
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#include "i2c.h"
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/*!
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* @brief 存放回调入口
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*
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*/
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static I2C_CallbackType I2C_Callback[2] = {(I2C_CallbackType)NULL};
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void I2C0_Isr( void );
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/******************************************************************************
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* 定义I2C的接口函数
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*******************************************************************************/
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/*****************************************************************************//*!
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*
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* @brief 初始化I2C模块.
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*
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* @param[in] pI2Cx I2C的基址.
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* @param[in] pI2CConfig 配置I2C的结构体.
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*
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* @return none
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*
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*****************************************************************************/
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void I2C_Init(I2C_Type *pI2Cx,I2C_ConfigPtr pI2CConfig)
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{
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uint8_t u8Temp;
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#if defined(CPU_NV32)
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SIM->SCGC |= SIM_SCGC_IIC_MASK;
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#endif
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I2C_SetBaudRate(pI2Cx,pI2CConfig->u16F);
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I2C_SetSlaveAddress(pI2Cx,pI2CConfig->u16OwnA1);
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pI2Cx->FLT = (uint8_t)pI2CConfig->u16Filt;
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pI2Cx->RA = (uint8_t)pI2CConfig->u16RangeA & 0xfe;
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I2C_SetSCLLowETMeout(pI2Cx,pI2CConfig->u16Slt);
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/* 配置控制寄存器C2 */
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u8Temp = 0;
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if( pI2CConfig->sSetting.bGCAEn )
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{
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u8Temp |= I2C_C2_GCAEN_MASK;
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}
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if( pI2CConfig->sSetting.bAddressExt )
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{
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u8Temp |= I2C_C2_ADEXT_MASK;
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}
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if( pI2CConfig->sSetting.bRangeAddEn )
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{
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u8Temp |= I2C_C2_RMEN_MASK;
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}
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pI2Cx->C2 |= u8Temp;
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/* 配置寄存器SMB */
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u8Temp = 0;
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if( pI2CConfig->sSetting.bFackEn )
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{
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u8Temp |= I2C_SMB_FACK_MASK;
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}
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if( pI2CConfig->sSetting.bSMB_AlertEn )
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{
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u8Temp |= I2C_SMB_ALERTEN_MASK;
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}
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if( pI2CConfig->sSetting.bSecondAddressEn )
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{
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u8Temp |= I2C_SMB_SIICAEN_MASK;
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}
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if( pI2CConfig->sSetting.bSHTF2IntEn )
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{
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u8Temp |= I2C_SMB_SHTF2IE_MASK;
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}
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pI2Cx->SMB = u8Temp;
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/* 配置寄存器C1 */
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u8Temp = 0;
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if( pI2CConfig->sSetting.bIntEn )
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{
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u8Temp |= I2C_C1_IICIE_MASK;
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if(pI2Cx == I2C0)
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{
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NVIC_EnableIRQ(I2C0_IRQn);
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}
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else
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{
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//
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}
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}
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if( pI2CConfig->sSetting.bWakeUpEn )
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{
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u8Temp |= I2C_C1_WUEN_MASK;
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}
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if( pI2CConfig->sSetting.bI2CEn )
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{
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u8Temp |= I2C_C1_IICEN_MASK;
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}
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pI2Cx->C1 = u8Temp;
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}
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/*****************************************************************************//*!
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*
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* @brief 发送I2C起始信号（启动传输）.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_Start(I2C_Type *pI2Cx)
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{
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uint32_t u32ETMeout;
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uint8_t u8ErrorStatus;
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u32ETMeout = 0;
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u8ErrorStatus = 0x00;
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I2C_TxEnable(pI2Cx);//将 I2C 配置成 TX 发送模式
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pI2Cx->C1 |= I2C_C1_MST_MASK;//将 I2C 配置成主机模式
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//持续监测起始位有没有发送成功
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while( (!I2C_IsBusy(pI2Cx)) && ( u32ETMeout < I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if( u32ETMeout == I2C_WAIT_STATUS_ETMEOUT )
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{
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u8ErrorStatus |= I2C_ERROR_START_NO_BUSY_FLAG;
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}
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return u8ErrorStatus;//返回错误标志，为0x10即起始信号没有发送成功
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}
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/*****************************************************************************//*!
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*
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* @brief 发送停止信号.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_Stop(I2C_Type *pI2Cx)
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{
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uint32_t u32ETMeout;
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uint8_t u8ErrorStatus;
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u32ETMeout = 0;
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u8ErrorStatus = 0x00;
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pI2Cx->C1 &= ~I2C_C1_MST_MASK;
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//持续监测 I2C 停止位是否发送成功
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while( (I2C_IsBusy(pI2Cx) ) && ( u32ETMeout < I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if( u32ETMeout == I2C_WAIT_STATUS_ETMEOUT )
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{
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u8ErrorStatus |= I2C_ERROR_STOP_BUSY_FLAG;
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}
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return u8ErrorStatus;
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}
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/*****************************************************************************//*!
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*
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* @brief 发送重复起始位.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return 错误状态.
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*
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*****************************************************************************/
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uint8_t I2C_RepeatStart(I2C_Type *pI2Cx)
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{
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uint32_t u32ETMeout;
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uint8_t u8ErrorStatus;
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u32ETMeout = 0;
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u8ErrorStatus = 0x00;
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pI2Cx->C1 |= I2C_C1_RSTA_MASK;
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//持续监测起始位是否发送成功
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while( (!I2C_IsBusy(I2C0) ) && ( u32ETMeout < I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if( u32ETMeout == I2C_WAIT_STATUS_ETMEOUT )
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{
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u8ErrorStatus |= I2C_ERROR_START_NO_BUSY_FLAG;
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}
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return u8ErrorStatus;
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}
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/*****************************************************************************//*!
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*
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* @brief 设置从机地址.
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*
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* @param[in] pI2Cx I2C的基址.
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* @param[in] u16SlaveAddress 从机地址.
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*
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* @return none
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*
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*****************************************************************************/
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void I2C_SetSlaveAddress(I2C_Type *pI2Cx,uint16_t u16SlaveAddress)
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{
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/* 写入8位地址 */
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pI2Cx->A1 = (uint8_t)u16SlaveAddress;
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/* 如果支持十位从机地址， 写入高三位地址 */
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pI2Cx->C2 &= ~I2C_C2_AD_MASK;
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pI2Cx->C2 |= (uint8_t)(u16SlaveAddress>>8)&0x03;
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}
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/*****************************************************************************//*!
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*
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* @brief 禁用I2C中断.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return none.
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*
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*****************************************************************************/
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void I2C_IntDisable(I2C_Type *pI2Cx)
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{
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pI2Cx->C1 &= ~I2C_C1_IICIE_MASK;
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if(pI2Cx == I2C0)
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{
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NVIC_DisableIRQ(I2C0_IRQn);
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}
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else
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{
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 使能I2C中断.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return none.
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*
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*****************************************************************************/
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void I2C_IntEnable(I2C_Type *pI2Cx)
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{
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pI2Cx->C1 |= I2C_C1_IICIE_MASK;
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if(pI2Cx == I2C0)
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{
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NVIC_EnableIRQ(I2C0_IRQn);
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}
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else
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{
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 设置SCL低超时周期.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return none.
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*
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*****************************************************************************/
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void I2C_SetSCLLowETMeout(I2C_Type *pI2Cx, uint16_t u16ETMeout)
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{
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pI2Cx->SLTL = (uint8_t)u16ETMeout;
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pI2Cx->SLTH = (uint8_t)(u16ETMeout>>8);
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}
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/*****************************************************************************//*!
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*
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* @brief 复位I2C模块.
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*
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* @param[in] pI2Cx I2C的基址.
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*
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* @return none
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*
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*****************************************************************************/
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void I2C_Deinit(I2C_Type *pI2Cx)
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{
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pI2Cx->C1 &= ~I2C_C1_IICEN_MASK;
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#if defined(CPU_NV32)
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SIM->SCGC &= ~SIM_SCGC_IIC_MASK;
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#endif
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}
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/*****************************************************************************//*!
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*
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* @brief 发送单字节数据.
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*
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* @param[in] pI2Cx I2C模块的基址.
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* @param[in] u8WrBuff 要写的数据缓冲区.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_WriteOneByte(I2C_Type *pI2Cx, uint8_t u8WrBuff)
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{
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uint32_t u32ETMeout;
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uint8_t u8ErrorStatus;
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u32ETMeout = 0;
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u8ErrorStatus = 0x00;
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while (((I2C_GetStatus(pI2Cx)&I2C_S_TCF_MASK) != I2C_S_TCF_MASK)
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&& (u32ETMeout<I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if (u32ETMeout >= I2C_WAIT_STATUS_ETMEOUT)
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{
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u8ErrorStatus |= I2C_ERROR_NO_WAIT_TCF_FLAG;
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return u8ErrorStatus;
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}
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I2C_TxEnable(pI2Cx); //将 I2C 配置成 TX 输出模式
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I2C_WriteDataReg(pI2Cx,u8WrBuff); //写数据寄存器发送数据
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u32ETMeout = 0;
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while (((I2C_GetStatus(pI2Cx)&I2C_S_IICIF_MASK) != I2C_S_IICIF_MASK)
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&& (u32ETMeout<I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if (u32ETMeout >= I2C_WAIT_STATUS_ETMEOUT)
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{
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u8ErrorStatus |= I2C_ERROR_NO_WAIT_IICIF_FLAG;
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return u8ErrorStatus;
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}
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/* 清除中断标志位 */
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I2C_ClearStatus(pI2Cx,I2C_S_IICIF_MASK);
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if (I2C_GetStatus(pI2Cx) & I2C_S_RXAK_MASK)
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{
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u8ErrorStatus |= I2C_ERROR_NO_GET_ACK;
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}
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return u8ErrorStatus;
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}
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/*****************************************************************************//*!
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*
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* @brief 读取单字节数据.
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*
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* @param[in] pI2Cx I2C的基址.
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* @param[out] pRdBuff 所要从从机读的地址.
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* @param[out] u8Ack 发送 ack or nack.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_ReadOneByte(I2C_Type *pI2Cx, uint8_t *pRdBuff, uint8_t u8Ack)
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{
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uint32_t u32ETMeout;
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uint8_t u8ErrorStatus;
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u32ETMeout = 0;
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u8ErrorStatus = 0x00;
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while (((I2C_GetStatus(pI2Cx)&I2C_S_TCF_MASK) != I2C_S_TCF_MASK)
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&& (u32ETMeout<I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if (u32ETMeout >= I2C_WAIT_STATUS_ETMEOUT)
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{
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u8ErrorStatus |= I2C_ERROR_NO_WAIT_TCF_FLAG;
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return u8ErrorStatus;
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}
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I2C_RxEnable(pI2Cx); //将 I2C 配置为输入模式
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if( u8Ack )
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{
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/* 发送 nack */
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I2C_SendNack(pI2Cx);
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}
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else
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{
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/* 发送 ack */
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I2C_SendAck(pI2Cx);
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}
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*pRdBuff = I2C_ReadDataReg(pI2Cx); //将读到的数据存放到参数里头
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u32ETMeout = 0;
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//持续监测中断标志
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while (((I2C_GetStatus(pI2Cx)&I2C_S_IICIF_MASK) != I2C_S_IICIF_MASK)
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&& (u32ETMeout<I2C_WAIT_STATUS_ETMEOUT))
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{
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u32ETMeout ++;
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}
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if (u32ETMeout >= I2C_WAIT_STATUS_ETMEOUT)
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{
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u8ErrorStatus |= I2C_ERROR_NO_WAIT_IICIF_FLAG;
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return u8ErrorStatus;
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}
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/*清除 IIC 中断标志位 */
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I2C_ClearStatus(pI2Cx,I2C_S_IICIF_MASK);
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return u8ErrorStatus;
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}
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/*****************************************************************************//*!
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*
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* @brief 发送数据到I2C,然后等待数据传送完成.
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*
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* @param[in] pI2Cx I2C的基址.
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* @param[in] u16SlaveAddress 16位从机地址.
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* @param[in] pWrBuff 需要发送数据的缓冲数组.
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* @param[in] u32Length 发送字节的数目.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_MasterSendWait(I2C_Type *pI2Cx,uint16_t u16SlaveAddress,uint8_t *pWrBuff,uint32_t u32Length)
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{
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uint32_t i;
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uint8_t u8ErrorStatus;
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/* 发送起始信号 */
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u8ErrorStatus = I2C_Start(pI2Cx);
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/* 给从机发送从机地址 */
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u8ErrorStatus = I2C_WriteOneByte(pI2Cx,((uint8_t)u16SlaveAddress<<1) | I2C_WRITE);
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/* 如果没有错误发生， 则继续发送字节*/
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if( u8ErrorStatus == I2C_ERROR_NULL )
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{
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for(i=0;i<u32Length;i++)
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{
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u8ErrorStatus = I2C_WriteOneByte(pI2Cx,pWrBuff[i]);
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if( u8ErrorStatus != I2C_ERROR_NULL )
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{
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return u8ErrorStatus;
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}
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}
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}
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/*发送 I2C 停止位 */
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u8ErrorStatus = I2C_Stop(pI2Cx);
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return u8ErrorStatus;
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}
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/*****************************************************************************//*!
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*
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* @brief 读取多个字节并等待完成.
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*
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* @param[in] pI2Cx I2C的基址.
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* @param[in] u16SlaveAddress 从机地址.
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* @param[in] pRdBuff 用于接收数据的缓冲区.
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* @param[in] u32Length 接收数据的字节数.
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*
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* @return 错误状态
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*
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*****************************************************************************/
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uint8_t I2C_MasterReadWait(I2C_Type *pI2Cx,uint16_t u16SlaveAddress,uint8_t *pRdBuff,uint32_t u32Length)
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{
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uint32_t i;
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uint8_t u8ErrorStatus;
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/* 发送起始信号到总线 */
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u8ErrorStatus = I2C_Start(pI2Cx);
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/* 给从机发送器件地址 */
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u8ErrorStatus = I2C_WriteOneByte(pI2Cx,((uint8_t)u16SlaveAddress<<1) | I2C_READ);
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/* 如果没有错误发生， 则继续接收字节*/
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I2C_ReadOneByte(pI2Cx,&pRdBuff[0],I2C_SEND_ACK);
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if( u8ErrorStatus == I2C_ERROR_NULL )
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{
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for(i=0;i<u32Length-1;i++)
|
||
{
|
||
u8ErrorStatus = I2C_ReadOneByte(pI2Cx,&pRdBuff[i],I2C_SEND_ACK);
|
||
if( u8ErrorStatus != I2C_ERROR_NULL )
|
||
{
|
||
return u8ErrorStatus;
|
||
}
|
||
}
|
||
u8ErrorStatus = I2C_ReadOneByte(pI2Cx,&pRdBuff[i],I2C_SEND_NACK);
|
||
}
|
||
/*发送停止信号 */
|
||
u8ErrorStatus = I2C_Stop(pI2Cx);
|
||
|
||
return u8ErrorStatus;
|
||
|
||
}
|
||
|
||
/*****************************************************************************//*!
|
||
*
|
||
* @brief 设置I2C模块的中断回调函数
|
||
*
|
||
* @param[in] pfnCallback 回调函数的地址
|
||
*
|
||
* @return none
|
||
*
|
||
*****************************************************************************/
|
||
|
||
void I2C1_SetCallBack( I2C_CallbackType pCallBack )
|
||
{
|
||
I2C_Callback[1] = pCallBack;
|
||
}
|
||
|
||
/*****************************************************************************//*!
|
||
*
|
||
* @brief 设置RTC模块的中断回调函数
|
||
*
|
||
* @param[in] pfnCallback 回调函数的地址
|
||
*
|
||
* @return none
|
||
*
|
||
*****************************************************************************/
|
||
|
||
void I2C0_SetCallBack( I2C_CallbackType pCallBack )
|
||
{
|
||
I2C_Callback[0] = pCallBack;
|
||
}
|
||
/*! @} */
|
||
|
||
|
||
/*****************************************************************************//*!
|
||
*
|
||
* @brief I2C0 中断服务函数.
|
||
*
|
||
* @param
|
||
*
|
||
* @return none
|
||
*
|
||
*****************************************************************************/
|
||
void I2C0_Isr( void )
|
||
{
|
||
if( I2C_Callback[0] )
|
||
{
|
||
I2C_Callback[0]();
|
||
}
|
||
}
|
||
|
||
/*****************************************************************************//*!
|
||
*
|
||
* @brief I2C1 中断服务函数.
|
||
*
|
||
* @param
|
||
*
|
||
* @return none
|
||
*
|
||
*****************************************************************************/
|
||
void I2C1_Isr( void )
|
||
{
|
||
if( I2C_Callback[1] )
|
||
{
|
||
I2C_Callback[1]();
|
||
}
|
||
}
|
||
|
||
|
||
|