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|
/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_i2c.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the I2C firmware functions.
*******************************************************************************/
#include "ch32f20x_i2c.h"
#include "ch32f20x_rcc.h"
/* I2C SPE mask */
#define CTLR1_PE_Set ((uint16_t)0x0001)
#define CTLR1_PE_Reset ((uint16_t)0xFFFE)
/* I2C START mask */
#define CTLR1_START_Set ((uint16_t)0x0100)
#define CTLR1_START_Reset ((uint16_t)0xFEFF)
/* I2C STOP mask */
#define CTLR1_STOP_Set ((uint16_t)0x0200)
#define CTLR1_STOP_Reset ((uint16_t)0xFDFF)
/* I2C ACK mask */
#define CTLR1_ACK_Set ((uint16_t)0x0400)
#define CTLR1_ACK_Reset ((uint16_t)0xFBFF)
/* I2C ENGC mask */
#define CTLR1_ENGC_Set ((uint16_t)0x0040)
#define CTLR1_ENGC_Reset ((uint16_t)0xFFBF)
/* I2C SWRST mask */
#define CTLR1_SWRST_Set ((uint16_t)0x8000)
#define CTLR1_SWRST_Reset ((uint16_t)0x7FFF)
/* I2C PEC mask */
#define CTLR1_PEC_Set ((uint16_t)0x1000)
#define CTLR1_PEC_Reset ((uint16_t)0xEFFF)
/* I2C ENPEC mask */
#define CTLR1_ENPEC_Set ((uint16_t)0x0020)
#define CTLR1_ENPEC_Reset ((uint16_t)0xFFDF)
/* I2C ENARP mask */
#define CTLR1_ENARP_Set ((uint16_t)0x0010)
#define CTLR1_ENARP_Reset ((uint16_t)0xFFEF)
/* I2C NOSTRETCH mask */
#define CTLR1_NOSTRETCH_Set ((uint16_t)0x0080)
#define CTLR1_NOSTRETCH_Reset ((uint16_t)0xFF7F)
/* I2C registers Masks */
#define CTLR1_CLEAR_Mask ((uint16_t)0xFBF5)
/* I2C DMAEN mask */
#define CTLR2_DMAEN_Set ((uint16_t)0x0800)
#define CTLR2_DMAEN_Reset ((uint16_t)0xF7FF)
/* I2C LAST mask */
#define CTLR2_LAST_Set ((uint16_t)0x1000)
#define CTLR2_LAST_Reset ((uint16_t)0xEFFF)
/* I2C FREQ mask */
#define CTLR2_FREQ_Reset ((uint16_t)0xFFC0)
/* I2C ADD0 mask */
#define OADDR1_ADD0_Set ((uint16_t)0x0001)
#define OADDR1_ADD0_Reset ((uint16_t)0xFFFE)
/* I2C ENDUAL mask */
#define OADDR2_ENDUAL_Set ((uint16_t)0x0001)
#define OADDR2_ENDUAL_Reset ((uint16_t)0xFFFE)
/* I2C ADD2 mask */
#define OADDR2_ADD2_Reset ((uint16_t)0xFF01)
/* I2C F/S mask */
#define CKCFGR_FS_Set ((uint16_t)0x8000)
/* I2C CCR mask */
#define CKCFGR_CCR_Set ((uint16_t)0x0FFF)
/* I2C FLAG mask */
#define FLAG_Mask ((uint32_t)0x00FFFFFF)
/* I2C Interrupt Enable mask */
#define ITEN_Mask ((uint32_t)0x07000000)
/*******************************************************************************
* Function Name : I2C_DeInit
* Description : Deinitializes the I2Cx peripheral registers to their default
* reset values.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Return : None
*******************************************************************************/
void I2C_DeInit(I2C_TypeDef* I2Cx)
{
if (I2Cx == I2C1)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
}
else
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
}
}
/*******************************************************************************
* Function Name : I2C_Init
* Description : Initializes the I2Cx peripheral according to the specified
* parameters in the I2C_InitStruct.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
* contains the configuration information for the specified I2C peripheral.
* Return : None
*******************************************************************************/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
uint16_t tmpreg = 0, freqrange = 0;
uint16_t result = 0x04;
uint32_t pclk1 = 8000000;
RCC_ClocksTypeDef rcc_clocks;
tmpreg = I2Cx->CTLR2;
tmpreg &= CTLR2_FREQ_Reset;
RCC_GetClocksFreq(&rcc_clocks);
pclk1 = rcc_clocks.PCLK1_Frequency;
freqrange = (uint16_t)(pclk1 / 1000000);
tmpreg |= freqrange;
I2Cx->CTLR2 = tmpreg;
I2Cx->CTLR1 &= CTLR1_PE_Reset;
tmpreg = 0;
if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
{
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
if (result < 0x04)
{
result = 0x04;
}
tmpreg |= result;
I2Cx->RTR = freqrange + 1;
}
else
{
if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
{
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
}
else
{
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
result |= I2C_DutyCycle_16_9;
}
if ((result & CKCFGR_CCR_Set) == 0)
{
result |= (uint16_t)0x0001;
}
tmpreg |= (uint16_t)(result | CKCFGR_FS_Set);
I2Cx->RTR = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1);
}
I2Cx->CKCFGR = tmpreg;
I2Cx->CTLR1 |= CTLR1_PE_Set;
tmpreg = I2Cx->CTLR1;
tmpreg &= CTLR1_CLEAR_Mask;
tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
I2Cx->CTLR1 = tmpreg;
I2Cx->OADDR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
}
/*******************************************************************************
* Function Name : I2C_StructInit
* Description : Fills each I2C_InitStruct member with its default value.
* Input : I2C_InitStruct: pointer to an I2C_InitTypeDef structure which
* will be initialized.
* Return : None
*******************************************************************************/
void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
{
I2C_InitStruct->I2C_ClockSpeed = 5000;
I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStruct->I2C_OwnAddress1 = 0;
I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;
I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
}
/*******************************************************************************
* Function Name : I2C_Cmd
* Description : Enables or disables the specified I2C peripheral.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_PE_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_PE_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_DMACmd
* Description : Enables or disables the specified I2C DMA requests.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR2 |= CTLR2_DMAEN_Set;
}
else
{
I2Cx->CTLR2 &= CTLR2_DMAEN_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_DMALastTransferCmd
* Description : Specifies if the next DMA transfer will be the last one.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR2 |= CTLR2_LAST_Set;
}
else
{
I2Cx->CTLR2 &= CTLR2_LAST_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_GenerateSTART
* Description : Generates I2Cx communication START condition.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_START_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_START_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_GenerateSTOP
* Description : Generates I2Cx communication STOP condition.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_STOP_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_STOP_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_AcknowledgeConfig
* Description : Enables or disables the specified I2C acknowledge feature.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_ACK_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_ACK_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_OwnAddress2Config
* Description : Configures the specified I2C own address2.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Address: specifies the 7bit I2C own address2.
* Return : None
*******************************************************************************/
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)
{
uint16_t tmpreg = 0;
tmpreg = I2Cx->OADDR2;
tmpreg &= OADDR2_ADD2_Reset;
tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);
I2Cx->OADDR2 = tmpreg;
}
/*******************************************************************************
* Function Name : I2C_DualAddressCmd
* Description : Enables or disables the specified I2C dual addressing mode.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->OADDR2 |= OADDR2_ENDUAL_Set;
}
else
{
I2Cx->OADDR2 &= OADDR2_ENDUAL_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_GeneralCallCmd
* Description : Enables or disables the specified I2C general call feature.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_ENGC_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_ENGC_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_ITConfig
* Description : Enables or disables the specified I2C interrupts.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_IT: specifies the I2C interrupts sources to be enabled or disabled.
* I2C_IT_BUF: Buffer interrupt mask.
* I2C_IT_EVT: Event interrupt mask.
* I2C_IT_ERR: Error interrupt mask.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR2 |= I2C_IT;
}
else
{
I2Cx->CTLR2 &= (uint16_t)~I2C_IT;
}
}
/*******************************************************************************
* Function Name : I2C_SendData
* Description : Sends a data byte through the I2Cx peripheral.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Data: Byte to be transmitted.
* Return : None
*******************************************************************************/
void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)
{
I2Cx->DATAR = Data;
}
/*******************************************************************************
* Function Name : I2C_ReceiveData
* Description : Returns the most recent received data by the I2Cx peripheral.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Return : The value of the received data.
*******************************************************************************/
uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)
{
return (uint8_t)I2Cx->DATAR;
}
/*******************************************************************************
* Function Name : I2C_Send7bitAddress
* Description : Transmits the address byte to select the slave device.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Address: specifies the slave address which will be transmitted.
* I2C_Direction: specifies whether the I2C device will be a
* Transmitter or a Receiver.
* I2C_Direction_Transmitter: Transmitter mode.
* I2C_Direction_Receiver: Receiver mode.
* Return : None
*******************************************************************************/
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)
{
if (I2C_Direction != I2C_Direction_Transmitter)
{
Address |= OADDR1_ADD0_Set;
}
else
{
Address &= OADDR1_ADD0_Reset;
}
I2Cx->DATAR = Address;
}
/*******************************************************************************
* Function Name : I2C_ReadRegister
* Description : Reads the specified I2C register and returns its value.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_Register: specifies the register to read.
* I2C_Register_CTLR1.
* I2C_Register_CTLR2.
* I2C_Register_OADDR1.
* I2C_Register_OADDR2.
* I2C_Register_DATAR.
* I2C_Register_STAR1.
* I2C_Register_STAR2.
* I2C_Register_CKCFGR.
* I2C_Register_RTR.
* Return : The value of the received data.
*******************************************************************************/
uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)
{
__IO uint32_t tmp = 0;
tmp = (uint32_t) I2Cx;
tmp += I2C_Register;
return (*(__IO uint16_t *) tmp);
}
/*******************************************************************************
* Function Name : I2C_SoftwareResetCmd
* Description : Enables or disables the specified I2C software reset.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_SWRST_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_SWRST_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_NACKPositionConfig
* Description : Selects the specified I2C NACK position in master receiver mode.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_NACKPosition: specifies the NACK position.
* I2C_NACKPosition_Next: indicates that the next byte will be
* the last received byte.
* I2C_NACKPosition_Current: indicates that current byte is the
* last received byte.
* Return : None
*******************************************************************************/
void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition)
{
if (I2C_NACKPosition == I2C_NACKPosition_Next)
{
I2Cx->CTLR1 |= I2C_NACKPosition_Next;
}
else
{
I2Cx->CTLR1 &= I2C_NACKPosition_Current;
}
}
/*******************************************************************************
* Function Name : I2C_SMBusAlertConfig
* Description : Drives the SMBusAlert pin high or low for the specified I2C.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_SMBusAlert: specifies SMBAlert pin level.
* I2C_SMBusAlert_Low: SMBAlert pin driven low.
* I2C_SMBusAlert_High: SMBAlert pin driven high.
* Return : None
*******************************************************************************/
void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)
{
if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
{
I2Cx->CTLR1 |= I2C_SMBusAlert_Low;
}
else
{
I2Cx->CTLR1 &= I2C_SMBusAlert_High;
}
}
/*******************************************************************************
* Function Name : I2C_TransmitPEC
* Description : Enables or disables the specified I2C PEC transfer.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_PEC_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_PEC_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_PECPositionConfig
* Description : Selects the specified I2C PEC position.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_PECPosition: specifies the PEC position.
* I2C_PECPosition_Next: indicates that the next byte is PEC.
* I2C_PECPosition_Current: indicates that current byte is PEC.
* Return : None
*******************************************************************************/
void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)
{
if (I2C_PECPosition == I2C_PECPosition_Next)
{
I2Cx->CTLR1 |= I2C_PECPosition_Next;
}
else
{
I2Cx->CTLR1 &= I2C_PECPosition_Current;
}
}
/*******************************************************************************
* Function Name : I2C_CalculatePEC
* Description : Enables or disables the PEC value calculation of the transferred bytes.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_ENPEC_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_ENPEC_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_GetPEC
* Description : Returns the PEC value for the specified I2C.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Return : The PEC value.
*******************************************************************************/
uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx)
{
return ((I2Cx->STAR2) >> 8);
}
/*******************************************************************************
* Function Name : I2C_ARPCmd
* Description : Enables or disables the specified I2C ARP.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : The PEC value.
*******************************************************************************/
void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState != DISABLE)
{
I2Cx->CTLR1 |= CTLR1_ENARP_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_ENARP_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_StretchClockCmd
* Description : Enables or disables the specified I2C Clock stretching.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
if (NewState == DISABLE)
{
I2Cx->CTLR1 |= CTLR1_NOSTRETCH_Set;
}
else
{
I2Cx->CTLR1 &= CTLR1_NOSTRETCH_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_FastModeDutyCycleConfig
* Description : Selects the specified I2C fast mode duty cycle.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_DutyCycle: specifies the fast mode duty cycle.
* I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2.
* I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9.
* Return : None
*******************************************************************************/
void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)
{
if (I2C_DutyCycle != I2C_DutyCycle_16_9)
{
I2Cx->CKCFGR &= I2C_DutyCycle_2;
}
else
{
I2Cx->CKCFGR |= I2C_DutyCycle_16_9;
}
}
/*******************************************************************************
* Function Name : I2C_CheckEvent
* Description : Checks whether the last I2Cx Event is equal to the one passed
* as parameter.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_EVENT: specifies the event to be checked.
* I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED : EV1.
* I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED : EV1.
* I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED : EV1.
* I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED : EV1.
* I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED : EV1.
* I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2.
* (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF) : EV2.
* (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL) : EV2.
* I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3.
* (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF) : EV3.
* (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3.
* I2C_EVENT_SLAVE_ACK_FAILURE : EV3_2.
* I2C_EVENT_SLAVE_STOP_DETECTED : EV4.
* I2C_EVENT_MASTER_MODE_SELECT : EV5.
* I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED : EV6.
* I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED : EV6.
* I2C_EVENT_MASTER_BYTE_RECEIVED : EV7.
* I2C_EVENT_MASTER_BYTE_TRANSMITTING : EV8.
* I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8_2.
* I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9.
* Return : ErrorStatus: SUCCESS or ERROR.
*******************************************************************************/
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
{
uint32_t lastevent = 0;
uint32_t flag1 = 0, flag2 = 0;
ErrorStatus status = ERROR;
flag1 = I2Cx->STAR1;
flag2 = I2Cx->STAR2;
flag2 = flag2 << 16;
lastevent = (flag1 | flag2) & FLAG_Mask;
if ((lastevent & I2C_EVENT) == I2C_EVENT)
{
status = SUCCESS;
}
else
{
status = ERROR;
}
return status;
}
/*******************************************************************************
* Function Name : I2C_GetLastEvent
* Description : Returns the last I2Cx Event.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Return : The last event.
*******************************************************************************/
uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)
{
uint32_t lastevent = 0;
uint32_t flag1 = 0, flag2 = 0;
flag1 = I2Cx->STAR1;
flag2 = I2Cx->STAR2;
flag2 = flag2 << 16;
lastevent = (flag1 | flag2) & FLAG_Mask;
return lastevent;
}
/*******************************************************************************
* Function Name : I2C_GetFlagStatus
* Description : Checks whether the last I2Cx Event is equal to the one passed
* as parameter.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_FLAG: specifies the flag to check.
* I2C_FLAG_DUALF: Dual flag (Slave mode).
* I2C_FLAG_SMBHOST: SMBus host header (Slave mode).
* I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode).
* I2C_FLAG_GENCALL: General call header flag (Slave mode).
* I2C_FLAG_TRA: Transmitter/Receiver flag.
* I2C_FLAG_BUSY: Bus busy flag.
* I2C_FLAG_MSL: Master/Slave flag.
* I2C_FLAG_SMBALERT: SMBus Alert flag.
* I2C_FLAG_TIMEOUT: Timeout or Tlow error flag.
* I2C_FLAG_PECERR: PEC error in reception flag.
* I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode).
* I2C_FLAG_AF: Acknowledge failure flag.
* I2C_FLAG_ARLO: Arbitration lost flag (Master mode).
* I2C_FLAG_BERR: Bus error flag.
* I2C_FLAG_TXE: Data register empty flag (Transmitter).
* I2C_FLAG_RXNE: Data register not empty (Receiver) flag.
* I2C_FLAG_STOPF: Stop detection flag (Slave mode).
* I2C_FLAG_ADD10: 10-bit header sent flag (Master mode).
* I2C_FLAG_BTF: Byte transfer finished flag.
* I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL"
* Address matched flag (Slave mode)"ENDA".
* I2C_FLAG_SB: Start bit flag (Master mode).
* Return : FlagStatus: SET or RESET.
*******************************************************************************/
FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
{
FlagStatus bitstatus = RESET;
__IO uint32_t i2creg = 0, i2cxbase = 0;
i2cxbase = (uint32_t)I2Cx;
i2creg = I2C_FLAG >> 28;
I2C_FLAG &= FLAG_Mask;
if(i2creg != 0)
{
i2cxbase += 0x14;
}
else
{
I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
i2cxbase += 0x18;
}
if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : I2C_ClearFlag
* Description : Clears the I2Cx's pending flags.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_FLAG: specifies the flag to clear.
* I2C_FLAG_SMBALERT: SMBus Alert flag.
* I2C_FLAG_TIMEOUT: Timeout or Tlow error flag.
* I2C_FLAG_PECERR: PEC error in reception flag.
* I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode).
* I2C_FLAG_AF: Acknowledge failure flag.
* I2C_FLAG_ARLO: Arbitration lost flag (Master mode).
* I2C_FLAG_BERR: Bus error flag.
* Return : None
*******************************************************************************/
void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
{
uint32_t flagpos = 0;
flagpos = I2C_FLAG & FLAG_Mask;
I2Cx->STAR1 = (uint16_t)~flagpos;
}
/*******************************************************************************
* Function Name : I2C_GetITStatus
* Description : Checks whether the specified I2C interrupt has occurred or not.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* II2C_IT: specifies the interrupt source to check.
* I2C_IT_SMBALERT: SMBus Alert flag.
* I2C_IT_TIMEOUT: Timeout or Tlow error flag.
* I2C_IT_PECERR: PEC error in reception flag.
* I2C_IT_OVR: Overrun/Underrun flag (Slave mode).
* I2C_IT_AF: Acknowledge failure flag.
* I2C_IT_ARLO: Arbitration lost flag (Master mode).
* I2C_IT_BERR: Bus error flag.
* I2C_IT_TXE: Data register empty flag (Transmitter).
* I2C_IT_RXNE: Data register not empty (Receiver) flag.
* I2C_IT_STOPF: Stop detection flag (Slave mode).
* I2C_IT_ADD10: 10-bit header sent flag (Master mode).
* I2C_IT_BTF: Byte transfer finished flag.
* I2C_IT_ADDR: Address sent flag (Master mode) "ADSL" Address matched
* flag (Slave mode)"ENDAD".
* I2C_IT_SB: Start bit flag (Master mode).
* Return : None
*******************************************************************************/
ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
{
ITStatus bitstatus = RESET;
uint32_t enablestatus = 0;
enablestatus = (uint32_t)(((I2C_IT & ITEN_Mask) >> 16) & (I2Cx->CTLR2)) ;
I2C_IT &= FLAG_Mask;
if (((I2Cx->STAR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : I2C_ClearITPendingBit
* Description : Clears the I2Cx interrupt pending bits.
* Input : I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* I2C_IT: specifies the interrupt pending bit to clear.
* I2C_IT_SMBALERT: SMBus Alert interrupt.
* I2C_IT_TIMEOUT: Timeout or Tlow error interrupt.
* I2C_IT_PECERR: PEC error in reception interrupt.
* I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode).
* I2C_IT_AF: Acknowledge failure interrupt.
* I2C_IT_ARLO: Arbitration lost interrupt (Master mode).
* I2C_IT_BERR: Bus error interrupt.
* Return : None
*******************************************************************************/
void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
{
uint32_t flagpos = 0;
flagpos = I2C_IT & FLAG_Mask;
I2Cx->STAR1 = (uint16_t)~flagpos;
}
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