i2c.c

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/**************************************************************************/
#include "M4521.h"
 
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->CLKDIV = u32Div;
 
    /* Enable I2C */
    i2c->CTL |= I2C_CTL_I2CEN_Msk;
 
    return (SystemCoreClock / ((u32Div + 1) << 2));
}
 
void I2C_Close(I2C_T *i2c)
{
    /* Reset I2C Controller */
    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;
    }
 
    /* Disable I2C */
    i2c->CTL &= ~I2C_CTL_I2CEN_Msk;
}
 
void I2C_ClearTimeoutFlag(I2C_T *i2c)
{
    i2c->TOCTL |= I2C_TOCTL_TOIF_Msk;
}
 
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_CTL_STA;
    if(u8Stop)
        u32Reg |= I2C_CTL_STO;
    if(u8Si)
        u32Reg |= I2C_CTL_SI;
    if(u8Ack)
        u32Reg |= I2C_CTL_AA;
 
    i2c->CTL = (i2c->CTL & ~0x3C) | u32Reg;
}
 
void I2C_DisableInt(I2C_T *i2c)
{
    i2c->CTL &= ~I2C_CTL_INTEN_Msk;
}
 
void I2C_EnableInt(I2C_T *i2c)
{
    i2c->CTL |= I2C_CTL_INTEN_Msk;
}
 
uint32_t I2C_GetBusClockFreq(I2C_T *i2c)
{
    uint32_t u32Divider = i2c->CLKDIV;
 
    return (SystemCoreClock / ((u32Divider + 1) << 2));
}
 
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->CLKDIV = u32Div;
 
    return (SystemCoreClock / ((u32Div + 1) << 2));
}
 
uint32_t I2C_GetIntFlag(I2C_T *i2c)
{
    return ((i2c->CTL & I2C_CTL_SI_Msk) == I2C_CTL_SI_Msk ? 1 : 0);
}
 
uint32_t I2C_GetStatus(I2C_T *i2c)
{
    return (i2c->STATUS);
}
 
uint8_t I2C_GetData(I2C_T *i2c)
{
    return (i2c->DAT);
}
 
void I2C_SetData(I2C_T *i2c, uint8_t u8Data)
{
    i2c->DAT = u8Data;
}
 
void I2C_SetSlaveAddr(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddr, uint8_t u8GCMode)
{
    switch(u8SlaveNo)
    {
    case 1:
        i2c->ADDR1  = (u8SlaveAddr << 1) | u8GCMode;
        break;
    case 2:
        i2c->ADDR2  = (u8SlaveAddr << 1) | u8GCMode;
        break;
    case 3:
        i2c->ADDR3  = (u8SlaveAddr << 1) | u8GCMode;
        break;
    case 0:
    default:
        i2c->ADDR0  = (u8SlaveAddr << 1) | u8GCMode;
        break;
    }
}
 
void I2C_SetSlaveAddrMask(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddrMask)
{
    switch(u8SlaveNo)
    {
    case 1:
        i2c->ADDRMSK1  = u8SlaveAddrMask << 1;
        break;
    case 2:
        i2c->ADDRMSK2  = u8SlaveAddrMask << 1;
        break;
    case 3:
        i2c->ADDRMSK3  = u8SlaveAddrMask << 1;
        break;
    case 0:
    default:
        i2c->ADDRMSK0  = u8SlaveAddrMask << 1;
        break;
    }
}
 
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;
}
 
void I2C_DisableTimeout(I2C_T *i2c)
{
    i2c->TOCTL &= ~I2C_TOCTL_TOCEN_Msk;
}
 
void I2C_EnableWakeup(I2C_T *i2c)
{
    i2c->WKCTL |= I2C_WKCTL_WKEN_Msk;
}
 
void I2C_DisableWakeup(I2C_T *i2c)
{
    i2c->WKCTL &= ~I2C_WKCTL_WKEN_Msk;
}
 
uint32_t I2C_SMBusGetStatus(I2C_T *i2c)
{
    return (i2c->BUSSTS);
}
 
void I2C_SMBusClearInterruptFlag(I2C_T *i2c, uint8_t u8SMBusIntFlag)
{
    i2c->BUSSTS |= u8SMBusIntFlag;
}
 
void I2C_SMBusSetPacketByteCount(I2C_T *i2c, uint32_t u32PktSize)
{
    i2c->PKTSIZE = u32PktSize;
}
 
void I2C_SMBusOpen(I2C_T *i2c, uint8_t u8HostDevice)
{
    /* Clear  BMHEN, BMDEN of BUSCTL Register */
    i2c->BUSCTL &=  ~(I2C_BUSCTL_BMHEN_Msk | I2C_BUSCTL_BMDEN_Msk);
 
    /* Set SMBus Host/Device Mode, and enable Bus Management*/
    if(u8HostDevice == I2C_SMBH_ENABLE)
        i2c->BUSCTL |= (I2C_BUSCTL_BMHEN_Msk | I2C_BUSCTL_BUSEN_Msk);
    else
        i2c->BUSCTL |= (I2C_BUSCTL_BMDEN_Msk | I2C_BUSCTL_BUSEN_Msk);
}
 
void I2C_SMBusClose(I2C_T *i2c)
{
 
    i2c->BUSCTL = 0x00;
}
 
void I2C_SMBusPECTxEnable(I2C_T *i2c, uint8_t u8PECTxEn)
{
    i2c->BUSCTL &= ~I2C_BUSCTL_PECTXEN_Msk;
 
    if(u8PECTxEn)
        i2c->BUSCTL |= (I2C_BUSCTL_PECEN_Msk | I2C_BUSCTL_PECTXEN_Msk);
    else
        i2c->BUSCTL |= I2C_BUSCTL_PECEN_Msk;
}
 
uint8_t I2C_SMBusGetPECValue(I2C_T *i2c)
{
    return i2c->PKTCRC;
}
 
void I2C_SMBusIdleTimeout(I2C_T *i2c, uint32_t us, uint32_t u32Hclk)
{
    uint32_t  u32Div, u32Hclk_kHz;
 
    i2c->BUSCTL |= I2C_BUSCTL_TIDLE_Msk;
    u32Hclk_kHz = u32Hclk / 1000;
    u32Div = (((us * u32Hclk_kHz) / 1000) >> 2) - 1;
    if(u32Div > 255)
    {
        i2c->BUSTOUT = 0xFF;
    }
    else
    {
        i2c->BUSTOUT = u32Div;
    }
 
}
 
void I2C_SMBusTimeout(I2C_T *i2c, uint32_t ms, uint32_t u32Pclk)
{
    uint32_t u32Div, u32Pclk_kHz;
 
    i2c->BUSCTL &= ~I2C_BUSCTL_TIDLE_Msk;
 
    /* DIV4 disabled */
    i2c->TOCTL &= ~I2C_TOCTL_TOCEN_Msk;
    u32Pclk_kHz = u32Pclk / 1000;
    u32Div = ((ms * u32Pclk_kHz) / (16 * 1024)) - 1;
    if(u32Div <= 0xFF)
    {
        i2c->BUSTOUT = u32Div;
        return;
    }
 
    /* DIV4 enabled */
    i2c->TOCTL |= I2C_TOCTL_TOCEN_Msk;
 
    i2c->BUSTOUT = (((ms * u32Pclk_kHz) / (16 * 1024 * 4)) - 1) & 0xFF; //The max value is 255
}
 
void I2C_SMBusClockLoTimeout(I2C_T *i2c, uint32_t ms, uint32_t u32Pclk)
{
    uint32_t u32Div, u32Pclk_kHz;
 
    i2c->BUSCTL &= ~I2C_BUSCTL_TIDLE_Msk;
 
    /* DIV4 disabled */
    i2c->TOCTL &= ~I2C_TOCTL_TOCEN_Msk;
    u32Pclk_kHz = u32Pclk / 1000;
    u32Div = ((ms * u32Pclk_kHz) / (16 * 1024)) - 1;
    if(u32Div <= 0xFF)
    {
        i2c->CLKTOUT = u32Div;
        return;
    }
 
    /* DIV4 enabled */
    i2c->TOCTL |= I2C_TOCTL_TOCEN_Msk;
    i2c->CLKTOUT = (((ms * u32Pclk_kHz) / (16 * 1024 * 4)) - 1) & 0xFF; //The max value is 255
}
 /* end of group I2C_EXPORTED_FUNCTIONS */
 /* end of group I2C_Driver */
 /* end of group Standard_Driver */
 
/*** (C) COPYRIGHT 2022 Nuvoton Technology Corp. ***/