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/****************************************************************************//**
* @file i2c.c
* @version V0.10
* $Revision: 13 $
* $Date: 14/09/30 1:10p $
* @brief NUC472/NUC442 I2C driver source file
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include "NUC472_442.h"
/** @addtogroup NUC472_442_Device_Driver NUC472/NUC442 Device Driver
@{
*/
/** @addtogroup NUC472_442_I2C_Driver I2C Driver
@{
*/
/** @addtogroup NUC472_442_I2C_EXPORTED_FUNCTIONS I2C Exported Functions
@{
*/
/**
* @brief This function make I2C module be ready and set the wanted bus clock.
* @param[in] i2c is the base address of I2C module.
* @param[in] u32BusClock is the target bus speed of I2C module.
* @return Actual I2C bus clock frequency.
*/
uint32_t I2C_Open(I2C_T *i2c, uint32_t u32BusClock)
{
uint32_t u32Div;
uint32_t u32Pclk = CLK_GetPCLKFreq();
u32Div = (uint32_t) ((( u32Pclk * 10)/(u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
i2c->CLKDIV = u32Div;
/* Enable I2C */
i2c->CTL |= I2C_CTL_I2CEN_Msk;
return ( u32Pclk / ((u32Div+1)<<2) );
}
/**
* @brief This function closes the I2C module.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_Close(I2C_T *i2c)
{
/* Reset SPI */
if((uint32_t)i2c == I2C0_BASE) {
SYS->IPRST1 |= SYS_IPRST1_I2C0RST_Msk;
SYS->IPRST1 &= ~SYS_IPRST1_I2C0RST_Msk;
} else if((uint32_t)i2c == I2C1_BASE) {
SYS->IPRST1 |= SYS_IPRST1_I2C1RST_Msk;
SYS->IPRST1 &= ~SYS_IPRST1_I2C1RST_Msk;
} else if((uint32_t)i2c == I2C2_BASE) {
SYS->IPRST1 |= SYS_IPRST1_I2C2RST_Msk;
SYS->IPRST1 &= ~SYS_IPRST1_I2C2RST_Msk;
} else {
SYS->IPRST1 |= SYS_IPRST1_I2C3RST_Msk;
SYS->IPRST1 &= ~SYS_IPRST1_I2C3RST_Msk;
}
/* Disable I2C */
i2c->CTL &= ~I2C_CTL_I2CEN_Msk;
}
/**
* @brief This function clears the time-out flag.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_ClearTimeoutFlag(I2C_T *i2c)
{
i2c->TOCTL |= I2C_TOCTL_TOIF_Msk;
}
/**
* @brief This function sets the control bit of the I2C module.
* @param[in] i2c is the base address of I2C module.
* @param[in] u8Start sets START bit to I2C module.
* @param[in] u8Stop sets STOP bit to I2C module.
* @param[in] u8Si sets SI bit to I2C module.
* @param[in] u8Ack sets ACK bit to I2C module.
* @return none
*/
void I2C_Trigger(I2C_T *i2c, uint8_t u8Start, uint8_t u8Stop, uint8_t u8Si, uint8_t u8Ack)
{
uint32_t u32Reg = 0;
uint32_t u32Val = i2c->CTL & ~(I2C_STA | I2C_STO | I2C_AA);
if (u8Start)
u32Reg |= I2C_STA;
if (u8Stop)
u32Reg |= I2C_STO;
if (u8Si)
u32Reg |= I2C_SI;
if (u8Ack)
u32Reg |= I2C_AA;
i2c->CTL = u32Val | u32Reg;
}
/**
* @brief This function disables the interrupt of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_DisableInt(I2C_T *i2c)
{
i2c->CTL &= ~I2C_CTL_INTEN_Msk;
}
/**
* @brief This function enables the interrupt (EI bit) of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_EnableInt(I2C_T *i2c)
{
i2c->CTL |= I2C_CTL_INTEN_Msk;
}
/**
* @brief This function returns the real bus clock of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return Actual I2C bus clock frequency.
*/
uint32_t I2C_GetBusClockFreq(I2C_T *i2c)
{
uint32_t u32Divider = i2c->CLKDIV;
return ( CLK_GetPCLKFreq() / ((u32Divider+1)<<2) );
}
/**
* @brief This function sets bus frequency of I2C module.
* @param[in] i2c is the base address of I2C module.
* @param[in] u32BusClock is the target bus speed of I2C module.
* @return Actual I2C bus clock frequency.
*/
uint32_t I2C_SetBusClockFreq(I2C_T *i2c, uint32_t u32BusClock)
{
uint32_t u32Div;
uint32_t u32Pclk = CLK_GetPCLKFreq();
u32Div = (uint32_t) (((u32Pclk * 10)/(u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
i2c->CLKDIV = u32Div;
return ( u32Pclk / ((u32Div+1)<<2) );
}
/**
* @brief This function gets the interrupt flag of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return Interrupt flag.
* @retval 0 Flag is not set.
* @retval 1 Flag is set.
*/
uint32_t I2C_GetIntFlag(I2C_T *i2c)
{
return ( (i2c->CTL & I2C_CTL_SI_Msk) == I2C_CTL_SI_Msk ? 1:0 );
}
/**
* @brief This function returns the status of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return I2C status
*/
uint32_t I2C_GetStatus(I2C_T *i2c)
{
return ( i2c->STATUS );
}
/**
* @brief This function returns the data stored in data register of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return I2C data.
*/
uint32_t I2C_GetData(I2C_T *i2c)
{
return ( i2c->DAT );
}
/**
* @brief This function writes the data to data register of I2C module.
* @param[in] i2c is the base address of I2C module.
* @param[in] u8Data is the data which will be write to data register of I2C module.
* @return none
*/
void I2C_SetData(I2C_T *i2c, uint8_t u8Data)
{
i2c->DAT = u8Data;
}
/**
* @brief Configure slave address and enable GC mode.
* @param[in] i2c is the base address of I2C module.
* @param[in] u8SlaveNo is the set number of salve address.
* @param[in] u8SlaveAddr is the slave address.
* @param[in] u8GCMode GC mode enable or not. Valid values are:
* - \ref I2C_GCMODE_ENABLE
* - \ref I2C_GCMODE_DISABLE
* @return none
*/
void I2C_SetSlaveAddr(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddr, uint8_t u8GCMode)
{
switch (u8SlaveNo) {
case 0:
i2c->ADDR0 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 1:
i2c->ADDR1 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 2:
i2c->ADDR2 = (u8SlaveAddr << 1) | u8GCMode;
break;
case 3:
i2c->ADDR3 = (u8SlaveAddr << 1) | u8GCMode;
break;
default:
i2c->ADDR0 = (u8SlaveAddr << 1) | u8GCMode;
}
}
/**
* @brief Configure the mask of slave address. The corresponding address bit is "Don't Care".
* @param[in] i2c is the base address of I2C module.
* @param[in] u8SlaveNo is the set number of salve address.
* @param[in] u8SlaveAddrMask is the slave address mask.
* @return none
*/
void I2C_SetSlaveAddrMask(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddrMask)
{
switch (u8SlaveNo) {
case 0:
i2c->ADDRMSK0 = u8SlaveAddrMask << 1;
break;
case 1:
i2c->ADDRMSK1 = u8SlaveAddrMask << 1;
break;
case 2:
i2c->ADDRMSK2 = u8SlaveAddrMask << 1;
break;
case 3:
i2c->ADDRMSK3 = u8SlaveAddrMask << 1;
break;
default:
i2c->ADDRMSK0 = u8SlaveAddrMask << 1;
}
}
/**
* @brief This function enables timeout function and configures DIV4 function to support long timeout.
* @param[in] i2c is the base address of I2C module.
* @param[in] u8LongTimeout Enable timeout counter input clock is divide by 4.
* @return none
*/
void I2C_EnableTimeout(I2C_T *i2c, uint8_t u8LongTimeout)
{
if(u8LongTimeout)
i2c->TOCTL |= I2C_TOCTL_TOCDIV4_Msk;
else
i2c->TOCTL &= ~I2C_TOCTL_TOCDIV4_Msk;
i2c->TOCTL |= I2C_TOCTL_TOCEN_Msk;
}
/**
* @brief This function disables time-out function.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_DisableTimeout(I2C_T *i2c)
{
i2c->TOCTL &= ~I2C_TOCTL_TOCEN_Msk;
}
/**
* @brief This function enables the wakeup function of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_EnableWakeup(I2C_T *i2c)
{
i2c->WKCTL |= I2C_WKCTL_WKEN_Msk;
}
/**
* @brief This function disables the wakeup function of I2C module.
* @param[in] i2c is the base address of I2C module.
* @return none
*/
void I2C_DisableWakeup(I2C_T *i2c)
{
i2c->WKCTL &= ~I2C_WKCTL_WKEN_Msk;
}
/*@}*/ /* end of group NUC472_442_I2C_EXPORTED_FUNCTIONS */
/*@}*/ /* end of group NUC472_442_I2C_Driver */
/*@}*/ /* end of group NUC472_442_Device_Driver */
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
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