/*FUNCTION*-------------------------------------------------------------------
*
* Function Name : max3353_WriteReg
* Returned Value :
* Comments : Write data to max3353 register
*
*
*END*----------------------------------------------------------------------*/
bool max3353_WriteReg
(
uint8_t i2c_channel,
uint8_t regAdd ,
uint8_t regValue
)
{
/* Send I2C slave address to bus*/
i2c_Start(i2c_channel);
i2c_WriteByte(i2c_channel,(MAX3353_SLAVE_ADDR <<1) | 0);
i2c_Wait(i2c_channel);
/* Send register address of MAX3353 */
i2c_WriteByte(i2c_channel, regAdd);
i2c_Wait(i2c_channel);
/* Send data to MAX3353*/
i2c_WriteByte(i2c_channel, regValue);
i2c_Wait(i2c_channel);
/* Send stop signal */
i2c_Stop(i2c_channel);
Pause();
return TRUE;
}
/*!
* Read a register from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char u8MMA7660ReadRegister(unsigned char u8RegisterAddress)
{
unsigned char result;
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C1_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C1_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C1_D = (MMA7660_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C1_C1 &= (~I2C_C1_TX_MASK);
/* Turn off ACK */
I2C1_C1 |= I2C_C1_TXAK_MASK;
/* Dummy read */
result = I2C1_D ;
i2c_Wait();
/* Send stop */
i2c_Stop();
result = I2C1_D ;
return result;
}
/*!
* Read a register from the MPR084
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char i2cMultiReadRegister(uint8_t Address, uint8_t u8RegisterAddress, uint8_t *DataBlock, uint8_t ReadSize)
{
uint8_t result = 0;
unsigned int j;
/* Send Slave Address */
IIC_StartTransmission(Address,SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (Address << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
I2C0_C1 &= (~I2C_C1_TXAK_MASK);
/* Turn off ACK */
// I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Dummy read */
result = I2C0_D ;
for (j=0; j<5000; j++){};
i2c_Wait();
result = 0;
while(ReadSize--)
{
DataBlock[result++] = I2C0_D;
i2c_Wait();
if(ReadSize == 1)
{
/* Turn off ACK */
I2C0_C1 |= I2C_C1_TXAK_MASK;
}
}
/* Send stop */
i2c_Stop();
DataBlock[result] = I2C0_D ;
Pause();
return result;
}
/*!
* @brief 读取I2C设备指定地址寄存器的数据
* @param I2Cn_e I2C模块(I2C0、I2C1)
* @param SlaveID 从机地址(7位地址)
* @param reg 从机寄存器地址
* @return 读取的寄存器值
* @since v5.0
* Sample usage: uint8 value = i2c_read_reg(I2C0, 0x1D, 1);
*/
uint8 i2c_read_reg(I2Cn_e i2cn, uint8 SlaveID, uint8 reg)
{
//先写入寄存器地址,再读取数据,因此此过程是 I2C 的复合格式,改变数据方向时需要重新启动
uint8 result;
ASSERT((SlaveID & 0x80) == 0); //断言，我们要求的7位地址的值仅仅是7bit,不是通信时要求的高7位
//有些手册，给出的7位地址指的是8bit里的高7位
//有些手册，给出的7位地址指的是7bit
//请自行确认，可以尝试是否通信正常来确认
i2c_Start(i2cn); //发送启动信号
i2c_write_byte(i2cn, ( SlaveID << 1 ) | MWSR); //发送从机地址和写位
i2c_write_byte(i2cn, reg); //发送从机里的寄存器地址
i2c_RepeatedStart(i2cn); //复合格式，发送重新启动信号
i2c_write_byte(i2cn, ( SlaveID << 1) | MRSW ); //发送从机地址和读位
i2c_PutinRxMode(i2cn); //进入接收模式(不应答,只接收一个字节)
result = I2C_D_REG(I2CN[i2cn]); //虚假读取一次，启动接收数据
i2c_Wait(i2cn); //等待接收完成
i2c_Stop(i2cn); //发送停止信号
result = I2C_D_REG(I2CN[i2cn]); //读取数据
Pause(); //必须延时一下，否则出错
return result;
}
/*!
* Write a byte of Data to specified register on I2C0 bus
* @param Address I2C bus address
* @param u8RegisterAddress is Register Address
* @param u8Data is Data to write
*/
void i2cWriteRegister(uint8_t Address, uint8_t u8RegisterAddress, uint8_t u8Data)
{
/* send data to slave */
IIC_StartTransmission(Address,SlaveID,MWSR);
i2c_Wait();
I2C0_D = u8RegisterAddress;
i2c_Wait();
I2C0_D = u8Data;
i2c_Wait();
i2c_Stop();
Pause();
}
/*!
* Write a byte of Data to specified register on MMA7660
* @param u8RegisterAddress is Register Address
* @param u8Data is Data to write
*/
void I2CWriteRegister(unsigned char u8RegisterAddress, unsigned char u8Data)
{
/* send data to slave */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
I2C0_D = u8RegisterAddress;
i2c_Wait();
I2C0_D = u8Data;
i2c_Wait();
i2c_Stop();
Pause();
}
/*************************************************************************
* 野火嵌入式开发工作室
*
* 函数名称：I2C_WriteAddr
* 功能说明：写入一个字节数据到I2C设备指定寄存器地址
* 参数说明：I2Cn 模块号（I2C0、I2C1）
* SlaveID 7位从机地址
* Addr 从机的寄存器地址
* Data 数据
* 函数返回：无
* 修改时间：2012-1-20
* 备 注：
*************************************************************************/
void I2C_WriteAddr(I2Cn i2cn, u8 SlaveID, u8 Addr, u8 Data)
{
/* send data to slave */
I2C_StartTransmission(i2cn, SlaveID, MWSR); //启动传输
i2c_Wait(i2cn);
i2c_write_byte(i2cn, Addr); //写地址
i2c_Wait(i2cn);
i2c_write_byte(i2cn, Data); //写数据
i2c_Wait(i2cn);
i2c_Stop(i2cn);
Pause(); //延时太短的话，可能写出错
}
/*!
* Read a register from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char u8MMA7660ReadRegister(unsigned char u8RegisterAddress)
{
signed char result = 0;
int tries_remaining = 5;
// while ((result & 0x40) && tries_remaining--)
// {
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (MMA7660_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Turn off ACK since this is second to last byte being read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Dummy read */
result = I2C0_D ;
i2c_Wait();
/* Send stop since about to read last byte */
i2c_Stop();
/* Read byte */
result = I2C0_D ;
// }
if (result & 0x40)
{
puts("Returning alerted (invalid) result");
}
time_delay_ms(200);
return result;
}
/*FUNCTION*-------------------------------------------------------------------
*
* Function Name : max3353_ReadReg
* Returned Value :
* Comments : Read data from max3353 register
*
*
*END*----------------------------------------------------------------------*/
bool max3353_ReadReg
(
uint8_t i2c_channel,
uint8_t regAdd,
uint8_t* p_regValue
)
{
uint8_t result;
uint32_t j;
/* Send Slave Address */
i2c_Start(i2c_channel);
i2c_WriteByte(i2c_channel, (MAX3353_SLAVE_ADDR <<1) | 0);
i2c_Wait(i2c_channel);
/* Write Register Address */
i2c_WriteByte(i2c_channel, regAdd);
i2c_Wait(i2c_channel);
/* Do a repeated start */
i2c_RepeatedStart(i2c_channel);
/* Send Slave Address */
i2c_WriteByte(i2c_channel, (MAX3353_SLAVE_ADDR << 1) | 0x01);
i2c_Wait(i2c_channel);
/* Put in Rx Mode */
i2c_SetRXMode(i2c_channel);
/* Turn off ACK */
i2c_GiveNACK(i2c_channel);
/* Dummy read */
result = i2c_ReadByte(i2c_channel);
for (j=0; j<5000; j++){};
i2c_Wait(i2c_channel);
/* Send stop signal */
i2c_Stop(i2c_channel);
result = i2c_ReadByte(i2c_channel);
Pause();
*p_regValue = result;
return TRUE;
}
// i2c_Read - Reads a byte from Slave device
uint8_t i2c_Read(uint8_t ack)
{
// Read data from slave
// ack should be 1 if there is going to be more data read
// ack should be 0 if this is the last byte of data read
uint8_t i2cReadData;
i2c_Wait();
RCEN=1;
i2c_Wait();
i2cReadData = SSPBUF;
i2c_Wait();
if ( ack ) ACKDT=0; // Ack
else ACKDT=1; // NAck
ACKEN=1; // send acknowledge sequence
return( i2cReadData );
}
// i2c_Address - Sends Slave Address and Read/Write mode
// mode is either I2C_WRITE or I2C_READ
void i2c_Address(uint8_t address, uint8_t mode)
{
uint8_t l_address;
l_address=address<<1;
l_address+=mode;
i2c_Wait();
SSPBUF = l_address;
}
/*FUNCTION*-------------------------------------------------------------------
*
* Function Name : I2C_WriteRegister
* Returned Value : None
* Comments : Write a byte of Data
*
*
*END*----------------------------------------------------------------------*/
void I2C_WriteRegister(unsigned char u8I2CSlaveAddress,unsigned char u8RegisterAddress, unsigned char u8Data)
{
/* send data to slave */
IIC_StartTransmission(u8I2CSlaveAddress,MWSR);
i2c_Wait();
/* Send I2C address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Send data */
I2C0_D = u8Data;
i2c_Wait();
i2c_Stop();
Pause();
}
/*!
* Write a byte of Data to specified register on I2C0 bus
* @param Address I2C bus address
* @param PtrData pointer to where the data is located
* @param Size number of bytes to write
*/
void i2cWriteData(uint8_t Address, uint8_t *PtrData,uint8_t Size)
{
uint8_t i;
if(Size)
{
/* send data to slave */
IIC_StartTransmission(Address,SlaveID,MWSR);
i2c_Wait();
for(i=0; i<Size; i++)
{
I2C0_D = PtrData[i];
i2c_Wait();
}
i2c_Stop();
Pause();
}
}
/*!
* Read first three registers from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned long u8MMA7660ReadThreeRegisters(unsigned char u8RegisterAddress)
{
unsigned char result1 = 0, result2 = 0, result3 = 0;
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (MMA7660_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Ensure TXAK bit is 0 */
I2C0_C1 &= ~I2C_C1_TXAK_MASK;
/* Dummy read */
result1 = I2C0_D ;
i2c_Wait();
/* Read first byte */
result1 = I2C0_D;
i2c_Wait();
/* Turn off ACK since this is second to last read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Read second byte */
result2 = I2C0_D;
i2c_Wait();
/* Send stop */
i2c_Stop();
/* Read third byte */
result3 = I2C0_D;
unsigned long totalresult = result1;
totalresult <<= 8;
totalresult |= result2;
totalresult <<= 8;
totalresult |= result3;
// Provide a gap between this read and the next
time_delay_ms(250);
return totalresult;
}
/*************************************************************************
* 野火嵌入式开发工作室
*
* 函数名称：I2C_ReadAddr
* 功能说明：读取I2C设备指定地址寄存器的数据
* 参数说明：I2Cn 模块号（I2C0、I2C1）
* SlaveID 7位从机地址
* Addr 从机的寄存器地址
* 函数返回：从机寄存器的数据
* 修改时间：2012-1-20
* 备 注：
*************************************************************************/
u8 I2C_ReadAddr(I2Cn i2cn, u8 SlaveID, u8 Addr)
{
u8 result;
/* Send Slave Address */
I2C_StartTransmission (i2cn, SlaveID, MWSR);
i2c_Wait(i2cn);
/* Write Register Address */
i2c_write_byte(i2cn, Addr);
i2c_Wait(i2cn);
/* Do a repeated start */
i2c_RepeatedStart(i2cn);
/* Send Slave Address */
i2c_write_byte(i2cn, ( SlaveID << 1) | MRSW );
i2c_Wait(i2cn);
/* Put in Rx Mode */
i2c_PutinRxMode(i2cn);
/* Turn off ACK since this is second to last byte being read*/
i2c_DisableAck(i2cn); //不应答
/* Dummy read 虚假读取*/
result = I2C_D_REG(I2Cx[i2cn]);
i2c_Wait(i2cn);
/* Send stop since about to read last byte */
i2c_Stop(i2cn);
/* Read byte */
result = I2C_D_REG(I2Cx[i2cn]);
return result;
}
/*FUNCTION*-------------------------------------------------------------------
*
* Function Name : I2C_ReadRegister
* Returned Value : None
* Comments : Read a register
*
*
*END*----------------------------------------------------------------------*/
unsigned char I2C_ReadRegister(unsigned char u8I2CSlaveAddress,unsigned char u8RegisterAddress)
{
unsigned char result;
unsigned int j;
/* Send Slave Address */
IIC_StartTransmission(u8I2CSlaveAddress,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (u8I2CSlaveAddress << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Turn off ACK */
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Dummy read */
result = I2C0_D ;
for (j=0; j<5000; j++){};
i2c_Wait();
/* Send stop */
i2c_Stop();
result = I2C0_D ;
Pause();
return result;
}
/*!
* Read a register from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char I2CReadRegister(unsigned char u8RegisterAddress)
{
unsigned char result;
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (ACCEL_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Turn off ACK since this is second to last byte being read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Dummy read */
result = I2C0_D ;
i2c_Wait();
/* Send stop since about to read last byte */
i2c_Stop();
/* Read byte */
result = I2C0_D ;
return result;
}
/*!
* Read first three registers from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char I2CReadMultiRegisters(unsigned char u8RegisterAddress, unsigned char bytes)
{
unsigned char n=bytes;
int i;
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (ACCEL_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Ensure TXAK bit is 0 */
I2C0_C1 &= ~I2C_C1_TXAK_MASK;
/* Dummy read */
result[0] = I2C0_D ;
i2c_Wait();
for(i=0;i<n-2;i++)
{
/* Read first byte */
result[i] = I2C0_D;
i2c_Wait();
}
/* Turn off ACK since this is second to last read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Read second byte */
result[i++] = I2C0_D;
i2c_Wait();
/* Send stop */
i2c_Stop();
/* Read third byte */
result[i++] = I2C0_D;
// printf("%3d %3d %3d\n",result[0],result[2],result[4]);
return result[0];
}
/*!
* Read first three registers from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
*/
unsigned char u8MMA7660ReadThreeRegisters(unsigned char u8RegisterAddress)
{
unsigned char result1, result2, result3;
/* Send Slave Address */
IIC_StartTransmission(SlaveID,MWSR);
i2c_Wait();
/* Write Register Address */
I2C0_D = u8RegisterAddress;
i2c_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (MMA7660_I2C_ADDRESS << 1) | 0x01; //read address
i2c_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Ensure TXAK bit is 0 */
I2C0_C1 &= ~I2C_C1_TXAK_MASK;
/* Dummy read */
result1 = I2C0_D ;
i2c_Wait();
/* Read first byte */
result1 = I2C0_D;
i2c_Wait();
/* Turn off ACK since this is second to last read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Read second byte */
result2 = I2C0_D;
i2c_Wait();
/* Send stop */
i2c_Stop();
/* Read third byte */
result3 = I2C0_D;
printf("%3d %3d %3d\n",result1,result2,result3);
return result1;
}
// i2c_Start - Start I2C communication
void i2c_Start(void)
{
i2c_Wait();
SSPCON2bits.SEN=1;
}
// i2c_Restart - Re-Start I2C communication
void i2c_Restart(void){
i2c_Wait();
SSPCON2bits.RSEN=1;
}
// i2c_Stop - Stop I2C communication
void i2c_Stop(void)
{
i2c_Wait();
SSPCON2bits.PEN=1;
}
// i2c_Write - Sends one byte of data
void i2c_Write(uint8_t data)
{
i2c_Wait();
SSPBUF = data;
}