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/**************************************************************************//**
* @file i2c.c
* @version V3.00
* $Revision: 4 $
* $Date: 14/01/28 10:49a $
* @brief M051 series I2C driver source file
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include "M051Series.h"
/** @addtogroup M051_Device_Driver M051 Device Driver
@{
*/
/** @addtogroup M051_I2C_Driver I2C Driver
@{
*/
/** @addtogroup M051_I2C_EXPORTED_FUNCTIONS I2C Exported Functions
@{
*/
/**
* @brief Enable specify I2C controller and set divider
*
* @param[in] i2c Specify I2C port
* @param[in] u32BusClock The target I2C bus clock in Hz
*
* @return Actual I2C bus clock frequency
*
* @details The function enable the specify I2C controller and set proper clock divider
* in I2C CLOCK DIVIDED REGISTER (I2CLK) according to the target I2C Bus clock.
* I2C bus clock = PCLK / (4*(divider+1).
*
*/
uint32_t I2C_Open(I2C_T *i2c, uint32_t u32BusClock)
{
uint32_t u32Div;
u32Div = (uint32_t)(((SystemCoreClock * 10) / (u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
i2c->I2CLK = u32Div;
/* Enable I2C */
i2c->I2CON |= I2C_I2CON_ENS1_Msk;
return (SystemCoreClock / ((u32Div + 1) << 2));
}
/**
* @brief Disable specify I2C controller
*
* @param[in] i2c Specify I2C port
*
* @return None
*
* @details Reset I2C controller and disable specify I2C port.
*
*/
void I2C_Close(I2C_T *i2c)
{
/* Reset I2C controller */
SYS->IPRSTC2 |= SYS_IPRSTC2_I2C_RST_Msk;
SYS->IPRSTC2 &= ~SYS_IPRSTC2_I2C_RST_Msk;
/* Disable I2C */
i2c->I2CON &= ~I2C_I2CON_ENS1_Msk;
}
/**
* @brief Clear time-out flag
*
* @param[in] i2c Specify I2C port
*
* @return None
*
* @details The function is used for clear I2C bus time-out flag.
*
*/
void I2C_ClearTimeoutFlag(I2C_T *i2c)
{
i2c->I2CTOC |= I2C_I2CTOC_TIF_Msk;
}
/**
* @brief Set control bit of I2C controller
*
* @param[in] i2c Specify I2C port
* @param[in] u8Start Set I2C START condition
* @param[in] u8Stop Set I2C STOP condition
* @param[in] u8Si Clear SI flag
* @param[in] u8Ack Set I2C ACK bit
*
* @return None
*
* @details The function set I2C control bit of I2C bus protocol.
*
*/
void I2C_Trigger(I2C_T *i2c, uint8_t u8Start, uint8_t u8Stop, uint8_t u8Si, uint8_t u8Ack)
{
uint32_t u32Reg = 0;
if(u8Start)
u32Reg |= I2C_I2CON_STA;
if(u8Stop)
u32Reg |= I2C_I2CON_STO;
if(u8Si)
u32Reg |= I2C_I2CON_SI;
if(u8Ack)
u32Reg |= I2C_I2CON_AA;
i2c->I2CON = (i2c->I2CON & ~0x3C) | u32Reg;
}
/**
* @brief Disable Interrupt of I2C Controller
*
* @param[in] i2c Specify I2C port
*
* @return None
*
* @details The function is used for disable I2C interrupt
*
*/
void I2C_DisableInt(I2C_T *i2c)
{
i2c->I2CON &= ~I2C_I2CON_EI_Msk;
}
/**
* @brief Enable Interrupt of I2C Controller
*
* @param[in] i2c Specify I2C port
*
* @return None
*
* @details The function is used for enable I2C interrupt
*
*/
void I2C_EnableInt(I2C_T *i2c)
{
i2c->I2CON |= I2C_I2CON_EI_Msk;
}
/**
* @brief Get I2C Bus Clock
*
* @param[in] i2c Specify I2C port
*
* @return The actual I2C Bus clock in Hz
*
* @details To get the actual I2C Bus Clock frequency.
*/
uint32_t I2C_GetBusClockFreq(I2C_T *i2c)
{
uint32_t u32Divider = i2c->I2CLK;
return (SystemCoreClock / ((u32Divider + 1) << 2));
}
/**
* @brief Set I2C Bus Clock
*
* @param[in] i2c Specify I2C port
* @param[in] u32BusClock The target I2C Bus Clock in Hz
*
* @return The actual I2C Bus clock in Hz
*
* @details To set the actual I2C Bus Clock frequency.
*/
uint32_t I2C_SetBusClockFreq(I2C_T *i2c, uint32_t u32BusClock)
{
uint32_t u32Div;
u32Div = (uint32_t)(((SystemCoreClock * 10) / (u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
i2c->I2CLK = u32Div;
return (SystemCoreClock / ((u32Div + 1) << 2));
}
/**
* @brief Get Interrupt Flag
*
* @param[in] i2c Specify I2C port
*
* @return I2C interrupt flag status
*
* @details To get I2C Bus interrupt flag.
*/
uint32_t I2C_GetIntFlag(I2C_T *i2c)
{
return ((i2c->I2CON & I2C_I2CON_SI_Msk) == I2C_I2CON_SI_Msk ? 1 : 0);
}
/**
* @brief Get I2C bus Status code
*
* @param[in] i2c Specify I2C port
*
* @return I2C status code
*
* @details To get I2C bus status code.
*/
uint32_t I2C_GetStatus(I2C_T *i2c)
{
return (i2c->I2CSTATUS);
}
/**
* @brief Read a Byte from I2C Bus
*
* @param[in] i2c Specify I2C port
*
* @return I2C Data
*
* @details To read a bytes data from specify I2C port.
*/
uint8_t I2C_GetData(I2C_T *i2c)
{
return (i2c->I2CDAT);
}
/**
* @brief Send a byte to I2C bus
*
* @param[in] i2c I2C port
* @param[in] u8Data The data to send to I2C bus
*
* @return None
*
* @details This function is used to write a byte to specified I2C port
*/
void I2C_SetData(I2C_T *i2c, uint8_t u8Data)
{
i2c->I2CDAT = u8Data;
}
/**
* @brief Set 7-bit Slave Address and GC Mode
*
* @param[in] i2c I2C port
* @param[in] u8SlaveNo Set the number of I2C address register (0~3)
* @param[in] u8SlaveAddr 7-bit slave address
* @param[in] u8GCMode Enable GC mode
*
* @return None
*
* @details This function is used to set 7-bit slave addresses in I2C SLAVE ADDRESS REGISTER (I2CADDR0~3)
* and enable GC mode.
*
*/
void I2C_SetSlaveAddr(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddr, uint8_t u8GCMode)
{
switch(u8SlaveNo)
{
case 1:
i2c->I2CADDR1 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 2:
i2c->I2CADDR2 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 3:
i2c->I2CADDR3 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 0:
default:
i2c->I2CADDR0 = (u8SlaveAddr << 1) | u8GCMode;
break;
}
}
/**
* @brief Configure the mask bits of 7-bit Slave Address
*
* @param[in] i2c I2C port
* @param[in] u8SlaveNo Set the number of I2C address mask register (0~3)
* @param[in] u8SlaveAddrMask A byte for slave address mask
*
* @return None
*
* @details This function is used to set 7-bit slave addresses.
*
*/
void I2C_SetSlaveAddrMask(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddrMask)
{
switch(u8SlaveNo)
{
case 1:
i2c->I2CADM1 = u8SlaveAddrMask << 1;
break;
case 2:
i2c->I2CADM2 = u8SlaveAddrMask << 1;
break;
case 3:
i2c->I2CADM3 = u8SlaveAddrMask << 1;
break;
case 0:
default:
i2c->I2CADM0 = u8SlaveAddrMask << 1;
break;
}
}
/**
* @brief Enable Time-out Function and support long time-out
*
* @param[in] i2c I2C port
* @param[in] u8LongTimeout Configure DIV4 to enable long time-out
*
* @return None
*
* @details This function enable time-out function and configure DIV4 to support long
* time-out.
*
*/
void I2C_EnableTimeout(I2C_T *i2c, uint8_t u8LongTimeout)
{
if(u8LongTimeout)
i2c->I2CTOC |= I2C_I2CTOC_DIV4_Msk;
else
i2c->I2CTOC &= ~I2C_I2CTOC_DIV4_Msk;
i2c->I2CTOC |= I2C_I2CTOC_ENTI_Msk;
}
/**
* @brief Disable Time-out Function
*
* @param[in] i2c I2C port
*
* @return None
*
* @details This function disable time-out function.
*
*/
void I2C_DisableTimeout(I2C_T *i2c)
{
i2c->I2CTOC &= ~I2C_I2CTOC_ENTI_Msk;
}
/**
* @brief Enable I2C Wake-up Function
*
* @param[in] i2c I2C port
*
* @return None
*
* @details The function is used to enable wake-up function of I2C controller
*
*/
void I2C_EnableWakeup(I2C_T *i2c)
{
i2c->I2CWKUPCON |= I2C_I2CWKUPCON_WKUPEN_Msk;
}
/**
* @brief Disable I2C Wake-up Function
*
* @param[in] i2c I2C port
*
* @return None
*
* @details The function is used to disable wake-up function of I2C controller
*
*/
void I2C_DisableWakeup(I2C_T *i2c)
{
i2c->I2CWKUPCON &= ~I2C_I2CWKUPCON_WKUPEN_Msk;
}
/*@}*/ /* end of group M051_I2C_EXPORTED_FUNCTIONS */
/*@}*/ /* end of group M051_I2C_Driver */
/*@}*/ /* end of group M051_Device_Driver */
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
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