www.pudn.com > Micrium-ST-uCOS-II-LCD-STM32-SK.rar > stm32f10x_i2c.c
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : stm32f10x_i2c.c
* Author : MCD Application Team
* Date First Issued : 09/29/2006
* Description : This file provides all the I2C firmware functions.
********************************************************************************
* History:
* 05/21/2007: V0.3
* 04/02/2007: V0.2
* 02/05/2007: V0.1
* 09/29/2006: V0.01
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_i2c.h"
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* I2C SPE mask */
#define CR1_PE_Set ((u16)0x0001)
#define CR1_PE_Reset ((u16)0xFFFE)
/* I2C DMAEN mask */
#define CR2_DMAEN_Set ((u16)0x0800)
#define CR2_DMAEN_Reset ((u16)0xF7FF)
/* I2C LAST mask */
#define CR2_LAST_Set ((u16)0x1000)
#define CR2_LAST_Reset ((u16)0xEFFF)
/* I2C START mask */
#define CR1_START_Set ((u16)0x0100)
#define CR1_START_Reset ((u16)0xFEFF)
/* I2C STOP mask */
#define CR1_STOP_Set ((u16)0x0200)
#define CR1_STOP_Reset ((u16)0xFDFF)
/* I2C ACK mask */
#define CR1_ACK_Set ((u16)0x0400)
#define CR1_ACK_Reset ((u16)0xFBFF)
/* I2C ENGC mask */
#define CR1_ENGC_Set ((u16)0x0040)
#define CR1_ENGC_Reset ((u16)0xFFBF)
/* I2C ADD0 mask */
#define OAR1_ADD0_Set ((u16)0x0001)
#define OAR1_ADD0_Reset ((u16)0xFFFE)
/* I2C SWRST mask */
#define CR1_SWRST_Set ((u16)0x8000)
#define CR1_SWRST_Reset ((u16)0x7FFF)
/* I2C PEC mask */
#define CR1_PEC_Set ((u16)0x1000)
#define CR1_PEC_Reset ((u16)0xEFFF)
/* I2C ENPEC mask */
#define CR1_ENPEC_Set ((u16)0x0020)
#define CR1_ENPEC_Reset ((u16)0xFFDF)
/* I2C ENARP mask */
#define CR1_ENARP_Set ((u16)0x0010)
#define CR1_ENARP_Reset ((u16)0xFFEF)
/* I2C NOSTRETCH mask */
#define CR1_NOSTRETCH_Set ((u16)0x0080)
#define CR1_NOSTRETCH_Reset ((u16)0xFF7F)
/* I2C ENDUAL mask */
#define OAR2_ENDUAL_Set ((u16)0x0001)
#define OAR2_ENDUAL_Reset ((u16)0xFFFE)
/* I2C F/S mask */
#define CCR_FS_Set ((u16)0x8000)
/* I2C ADD2 mask */
#define OAR2_ADD2_Reset ((u16)0xFF01)
/* I2C FREQ mask */
#define CR2_FREQ_Reset ((u16)0xFFC0)
/* I2C CCR mask */
#define CCR_CCR_Set ((u16)0x0FFF)
/* I2C FLAG mask */
#define I2C_FLAG_Mask ((u32)0x00FFFFFF)
/* I2C registers Masks */
#define CR1_CLEAR_Mask ((u16)0xFBF5)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* 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.
* Output : None
* Return : None
*******************************************************************************/
void I2C_DeInit(I2C_TypeDef* I2Cx)
{
switch (*(u32*)&I2Cx)
{
case I2C1_BASE:
/* Enable I2C1 reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Release I2C1 from reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
break;
case I2C2_BASE:
/* Enable I2C2 reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
/* Release I2C2 from reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
break;
default:
break;
}
}
/*******************************************************************************
* 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.
* Output : None
* Return : None
******************************************************************************/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
u16 tmpreg = 0, freqrange = 0;
u16 result = 0x04;
u32 pclk1clock = 12000000;
RCC_ClocksTypeDef RCC_Clocks;
/* Check the parameters */
assert(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
assert(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
assert(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
assert(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
assert(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
assert(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
/*---------------------------- I2Cx CR2 Configuration ------------------------*/
/* Get the I2Cx CR2 value */
tmpreg = I2Cx->CR2;
/* Clear frequency FREQ[5:0] bits */
tmpreg &= CR2_FREQ_Reset;
/* Get PCLK1Clock frequency value */
RCC_GetClocksFreq(&RCC_Clocks);
pclk1clock = RCC_Clocks.PCLK1_Frequency;
/* Set frequency bits depending on PCLK1Clock value */
freqrange = (u16)(pclk1clock / 1000000);
tmpreg |= freqrange;
/* Write to I2Cx CR2 */
I2Cx->CR2 = tmpreg;
/*---------------------------- I2Cx CCR Configuration ------------------------*/
/* Disable I2Cx to configure TRISE */
I2C_Cmd(I2Cx, DISABLE);
/* Reset tmpreg value */
/* Clear F/S, DUTY and CCR[11:0] bits */
tmpreg = 0;
/* Configure speed in standard mode */
if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
{
/* Standard mode speed calculate */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed << 1));
/* Test if CCR value is under 0x4*/
if (result < 0x04)
{
/* Set minimum allowed value */
result = 0x04;
}
/* Set speed value for standard mode */
tmpreg |= result;
/* Set Maximum Rise Time: ((1000/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = freqrange + 1;
}
/* Configure speed in fast mode */
else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
{
if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
{
/* Fast mode speed calculate: Tlow/Thigh = 2 */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed * 3));
}
else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
{
/* Fast mode speed calculate: Tlow/Thigh = 16/9 */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed * 25));
/* Set DUTY bit */
result |= I2C_DutyCycle_16_9;
}
/* Test if CCR value is under 0x1*/
if ((result & CCR_CCR_Set) == 0)
{
/* Set minimum allowed value */
result |= (u16)0x0001;
}
/* Set speed value and set F/S bit for fast mode */
tmpreg |= result | CCR_FS_Set;
/* Set Maximum Rise Time: ((300/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = (u16)(((freqrange * 300) / 1000) + 1);
}
/* Write to I2Cx CCR */
I2Cx->CCR = tmpreg;
/* Enable I2Cx */
I2C_Cmd(I2Cx, ENABLE);
/*---------------------------- I2Cx CR1 Configuration ------------------------*/
/* Get the I2Cx CR1 value */
tmpreg = I2Cx->CR1;
/* Clear ACK, SMBTYPE and SMBUS bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure I2Cx: mode and acknowledgement */
/* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
/* Set ACK bit according to I2C_Ack value */
tmpreg |= (u16)((u32)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
/* Write to I2Cx CR1 */
I2Cx->CR1 = tmpreg;
/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
/* Set I2Cx Own Address1 and acknowledged address */
I2Cx->OAR1 = (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.
* Output : None
* Return : None
*******************************************************************************/
void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
{
/*---------------- Reset I2C init structure parameters values ----------------*/
/* Initialize the I2C_Mode member */
I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;
/* Initialize the I2C_DutyCycle member */
I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;
/* Initialize the I2C_OwnAddress1 member */
I2C_InitStruct->I2C_OwnAddress1 = 0;
/* Initialize the I2C_Ack member */
I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;
/* Initialize the I2C_AcknowledgedAddress member */
I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
/* initialize the I2C_ClockSpeed member */
I2C_InitStruct->I2C_ClockSpeed = 5000;
}
/*******************************************************************************
* 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: new state of the I2Cx peripheral. This parameter
* can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected I2C peripheral */
I2Cx->CR1 |= CR1_PE_Set;
}
else
{
/* Disable the selected I2C peripheral */
I2Cx->CR1 &= CR1_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: new state of the I2C DMA transfer.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected I2C DMA requests */
I2Cx->CR2 |= CR2_DMAEN_Set;
}
else
{
/* Disable the selected I2C DMA requests */
I2Cx->CR2 &= CR2_DMAEN_Reset;
}
}
/*******************************************************************************
* Function Name : I2C_DMALastTransferCmd
* Description : Specifies that the next DMA transfer is the last one.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - NewState: new state of the I2C DMA last transfer.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Next DMA end of transfer is the last transfer */
I2Cx->CR2 |= CR2_LAST_Set;
}
else
{
/* Next DMA end of transfer is not the last transfer */
I2Cx->CR2 &= CR2_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: new state of the I2C START condition generation.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None.
*******************************************************************************/
void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Generate a START condition */
I2Cx->CR1 |= CR1_START_Set;
}
else
{
/* Disable the START condition generation */
I2Cx->CR1 &= CR1_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: new state of the I2C STOP condition generation.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None.
*******************************************************************************/
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Generate a STOP condition */
I2Cx->CR1 |= CR1_STOP_Set;
}
else
{
/* Disable the STOP condition generation */
I2Cx->CR1 &= CR1_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: new state of the I2C Acknowledgement.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None.
*******************************************************************************/
void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the acknowledgement */
I2Cx->CR1 |= CR1_ACK_Set;
}
else
{
/* Disable the acknowledgement */
I2Cx->CR1 &= CR1_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.
* Output : None
* Return : None.
*******************************************************************************/
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, u8 Address)
{
u16 tmpreg = 0;
/* Get the old register value */
tmpreg = I2Cx->OAR2;
/* Reset I2Cx Own address2 bit [7:1] */
tmpreg &= OAR2_ADD2_Reset;
/* Set I2Cx Own address2 */
tmpreg |= (u16)(Address & (u16)0x00FE);
/* Store the new register value */
I2Cx->OAR2 = 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: new state of the I2C dual addressing mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable dual addressing mode */
I2Cx->OAR2 |= OAR2_ENDUAL_Set;
}
else
{
/* Disable dual addressing mode */
I2Cx->OAR2 &= OAR2_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: new state of the I2C General call.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable generall call */
I2Cx->CR1 |= CR1_ENGC_Set;
}
else
{
/* Disable generall call */
I2Cx->CR1 &= CR1_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.
* This parameter can be any combination of the following values:
* - I2C_IT_BUF: Buffer interrupt mask
* - I2C_IT_EVT: Event interrupt mask
* - I2C_IT_ERR: Error interrupt mask
* - NewState: new state of the specified I2C interrupts.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_ITConfig(I2C_TypeDef* I2Cx, u16 I2C_IT, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
assert(IS_I2C_CONFIG_IT(I2C_IT));
if (NewState != DISABLE)
{
/* Enable the selected I2C interrupts */
I2Cx->CR2 |= I2C_IT;
}
else
{
/* Disable the selected I2C interrupts */
I2Cx->CR2 &= (u16)~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..
* Output : None
* Return : None
*******************************************************************************/
void I2C_SendData(I2C_TypeDef* I2Cx, u8 Data)
{
/* Write in the DR register the data to be sent */
I2Cx->DR = 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.
* Output : None
* Return : The value of the received data.
*******************************************************************************/
u8 I2C_ReceiveData(I2C_TypeDef* I2Cx)
{
/* Return the data in the DR register */
return (u8)I2Cx->DR;
}
/*******************************************************************************
* 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.
* This parameter can be one of the following values
* - I2C_Direction_Transmitter: Transmitter mode
* - I2C_Direction_Receiver: Receiver mode
* Output : None
* Return : None.
*******************************************************************************/
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, u8 Address, u8 I2C_Direction)
{
/* Check the parameters */
assert(IS_I2C_DIRECTION(I2C_Direction));
/* Test on the direction to set/reset the read/write bit */
if (I2C_Direction != I2C_Direction_Transmitter)
{
/* Set the address ADD0 bit0 for read */
Address |= OAR1_ADD0_Set;
}
else
{
/* Reset the address bit0 for write */
Address &= OAR1_ADD0_Reset;
}
/* Send the address */
I2Cx->DR = Address;
}
/*******************************************************************************
* Function Name : I2C_ReadRegister
* Description : Reads the specified I2C register and returns its value.
* Input1 : - I2C_Register: specifies the register to read.
* This parameter can be one of the following values:
* - I2C_Register_CR1: CR1 register.
* - I2C_Register_CR2: CR2 register.
* - I2C_Register_OAR1: OAR1 register.
* - I2C_Register_OAR2: OAR2 register.
* - I2C_Register_DR: DR register.
* - I2C_Register_SR1: SR1 register.
* - I2C_Register_SR2: SR2 register.
* - I2C_Register_CCR: CCR register.
* - I2C_Register_TRISE: TRISE register.
* Output : None
* Return : The value of the read register.
*******************************************************************************/
u16 I2C_ReadRegister(I2C_TypeDef* I2Cx, u8 I2C_Register)
{
/* Check the parameters */
assert(IS_I2C_REGISTER(I2C_Register));
/* Return the selected register value */
return (*(u16 *)(*((u32 *)&I2Cx) + I2C_Register));
}
/*******************************************************************************
* 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: new state of the I2C software reset.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Peripheral under reset */
I2Cx->CR1 |= CR1_SWRST_Set;
}
else
{
/* Peripheral not under reset */
I2Cx->CR1 &= CR1_SWRST_Reset;
}
}
/*******************************************************************************
* 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.
* This parameter can be one of the following values:
* - I2C_SMBusAlert_Low: SMBAlert pin driven low
* - I2C_SMBusAlert_High: SMBAlert pin driven high
* Output : None
* Return : None
*******************************************************************************/
void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, u16 I2C_SMBusAlert)
{
/* Check the parameters */
assert(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));
if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
{
/* Drive the SMBusAlert pin Low */
I2Cx->CR1 |= I2C_SMBusAlert_Low;
}
else
{
/* Drive the SMBusAlert pin High */
I2Cx->CR1 &= 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: new state of the I2C PEC transmission.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected I2C PEC transmission */
I2Cx->CR1 |= CR1_PEC_Set;
}
else
{
/* Disable the selected I2C PEC transmission */
I2Cx->CR1 &= CR1_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.
* This parameter can be one of the following values:
* - I2C_PECPosition_Next: PEC bit indicates that current
* byte is PEC
* - I2C_PECPosition_Current: PEC bit indicates that the
* next byte is PEC
* Output : None
* Return : None
*******************************************************************************/
void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, u16 I2C_PECPosition)
{
/* Check the parameters */
assert(IS_I2C_PEC_POSITION(I2C_PECPosition));
if (I2C_PECPosition == I2C_PECPosition_Next)
{
/* PEC indicates that the next byte in shift register is PEC */
I2Cx->CR1 |= I2C_PECPosition_Next;
}
else
{
/* PEC indicates that the current byte in shift register is PEC */
I2Cx->CR1 &= I2C_PECPosition_Current;
}
}
/*******************************************************************************
* Function Name : I2C_CalculatePEC
* Description : Enables or disables the PEC value calculation of the
* transfered bytes.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - NewState: new state of the I2Cx PEC value calculation.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected I2C PEC calculation */
I2Cx->CR1 |= CR1_ENPEC_Set;
}
else
{
/* Disable the selected I2C PEC calculation */
I2Cx->CR1 &= CR1_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.
* Output : None
* Return : The PEC value.
*******************************************************************************/
u8 I2C_GetPEC(I2C_TypeDef* I2Cx)
{
u8 pec;
/* Get the PEC value */
pec = (I2Cx->SR2) >> 8;
/* Return the selected I2C PEC register value */
return pec;
}
/*******************************************************************************
* 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: new state of the I2Cx ARP.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected I2C ARP */
I2Cx->CR1 |= CR1_ENARP_Set;
}
else
{
/* Disable the selected I2C ARP */
I2Cx->CR1 &= CR1_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: new state of the I2Cx Clock stretching.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState == DISABLE)
{
/* Enable the selected I2C Clock stretching */
I2Cx->CR1 |= CR1_NOSTRETCH_Set;
}
else
{
/* Disable the selected I2C Clock stretching */
I2Cx->CR1 &= CR1_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.
* This parameter can be one of the following values:
* - I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
* - I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
* Output : None
* Return : None
*******************************************************************************/
void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, u16 I2C_DutyCycle)
{
/* Check the parameters */
assert(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));
if (I2C_DutyCycle != I2C_DutyCycle_16_9)
{
/* I2C fast mode Tlow/Thigh=2 */
I2Cx->CCR &= I2C_DutyCycle_2;
}
else
{
/* I2C fast mode Tlow/Thigh=16/9 */
I2Cx->CCR |= I2C_DutyCycle_16_9;
}
}
/*******************************************************************************
* Function Name : I2C_GetLastEvent
* Description : Returns the last I2Cx Event.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Output : None
* Return : The last event
*******************************************************************************/
u32 I2C_GetLastEvent(I2C_TypeDef* I2Cx)
{
u32 LastEvent = 0;
u32 Flag1 = 0, Flag2 = 0;
Flag1 = I2Cx->SR1;
Flag2 = I2Cx->SR2;
Flag2 = Flag2 << 16;
/* Get the last event value from I2C status register */
LastEvent = (Flag1 | Flag2) & I2C_FLAG_Mask;
/* Return status */
return LastEvent;
}
/*******************************************************************************
* 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.
* This parameter can be one of the following values:
* - I2C_EVENT_SLAVE_ADDRESS_MATCHED : EV1
* - I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2
* - I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3
* - I2C_EVENT_SLAVE_ACK_FAILURE : EV3-1
* - I2C_EVENT_MASTER_MODE_SELECT : EV5
* - I2C_EVENT_MASTER_MODE_SELECTED : EV6
* - I2C_EVENT_MASTER_BYTE_RECEIVED : EV7
* - I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8
* - I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9
* - I2C_EVENT_SLAVE_STOP_DETECTED : EV4
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Last event is equal to the I2C_Event
* - ERROR: Last event is different from the I2C_Event
*******************************************************************************/
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, u32 I2C_EVENT)
{
u32 LastEvent = 0;
u32 Flag1 = 0, Flag2 = 0;
ErrorStatus status = ERROR;
/* Check the parameters */
assert(IS_I2C_EVENT(I2C_EVENT));
Flag1 = I2Cx->SR1;
Flag2 = I2Cx->SR2;
Flag2 = Flag2 << 16;
/* Get the last event value from I2C status register */
LastEvent = (Flag1 | Flag2) & I2C_FLAG_Mask;
/* Check whether the last event is equal to I2C_EVENT */
if (LastEvent == I2C_EVENT )
{
/* SUCCESS: last event is equal to I2C_EVENT */
status = SUCCESS;
}
else
{
/* ERROR: last event is different from I2C_EVENT */
status = ERROR;
}
/* Return status */
return status;
}
/*******************************************************************************
* Function Name : I2C_GetFlagStatus
* Description : Checks whether the specified I2C flag is set or not.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - I2C_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - 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)”ENDAD”
* - I2C_FLAG_SB: Start bit flag (Master mode)
* Output : None
* Return : The new state of I2C_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, u32 I2C_FLAG)
{
FlagStatus bitstatus = RESET;
u32 i2cstatus = 0;
u32 Flag1 = 0, Flag2 = 0;
/* Check the parameters */
assert(IS_I2C_GET_FLAG(I2C_FLAG));
/* Read the I2Cx status register */
Flag1 = I2Cx->SR1;
Flag2 = I2Cx->SR2;
Flag2 = (Flag2 & I2C_FLAG_Mask) << 16;
/* Get the I2C status value */
i2cstatus = Flag1 | Flag2;
/* Get bit[27:0] of the flag */
I2C_FLAG &= I2C_FLAG_Mask;
/* Check the status of the specified I2C flag */
if ((i2cstatus & I2C_FLAG) != (u32)RESET)
{
/* I2C_FLAG is set */
bitstatus = SET;
}
else
{
/* I2C_FLAG is reset */
bitstatus = RESET;
}
/* Return the I2C_FLAG status */
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.
* This parameter can be one of the following values:
* - 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_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)”ENDAD”
* - I2C_FLAG_SB: Start bit flag (Master mode)
* Output : None
* Return : None
*******************************************************************************/
void I2C_ClearFlag(I2C_TypeDef* I2Cx, u32 I2C_FLAG)
{
u32 flagpos = 0;
u8 flagindex = 0;
/* Check the parameters */
assert(IS_I2C_CLEAR_FLAG(I2C_FLAG));
/* Get the I2C flag position */
flagpos = I2C_FLAG & I2C_FLAG_Mask;
/* Get the I2C flag index */
flagindex = I2C_FLAG >> 28;
/* Clear the flag by writing 0 */
if (flagindex == 1)
{
/* Clear the selected I2C flag */
I2Cx->SR1 &= ~flagpos;
}
/* Flags that need a read of the SR1 register to be cleared */
else if (flagindex == 2)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
}
/* Flags that need a read of SR1 and a write on CR2 registers to be cleared */
else if (flagindex == 6)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Write on the CR1 register */
I2Cx->CR1 |= CR1_PE_Set;
}
/* Flags that need a read of SR1 and a write on CR2 registers to be cleared */
else /*flagindex == 0xA*/
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Read the SR2 register */
(void)I2Cx->SR2;
}
}
/*******************************************************************************
* 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.
* - I2C_IT: specifies the interrupt source to check.
* This parameter can be one of the following values:
* - 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)
* Output : None
* Return : The new state of I2C_IT (SET or RESET).
*******************************************************************************/
ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, u32 I2C_IT)
{
ITStatus bitstatus = RESET;
u32 i2cstatus = 0;
u32 Flag1 = 0, Flag2 = 0;
/* Check the parameters */
assert(IS_I2C_GET_IT(I2C_IT));
/* Read the I2Cx status register */
Flag1 = I2Cx->SR1;
Flag2 = I2Cx->SR2;
Flag2 = (Flag2 & I2C_FLAG_Mask) << 16;
/* Get the I2C status value */
i2cstatus = Flag1 | Flag2;
/* Get bit[27:0] of the flag */
I2C_IT &= I2C_FLAG_Mask;
/* Check the status of the specified I2C flag */
if ((i2cstatus & I2C_IT) != (u32)RESET)
{
/* I2C_IT is set */
bitstatus = SET;
}
else
{
/* I2C_IT is reset */
bitstatus = RESET;
}
/* Return the I2C_IT status */
return bitstatus;
}
/*******************************************************************************
* Function Name : I2C_ClearITPendingBit
* Description : Clears the I2Cx’s interrupt pending bits.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - I2C_IT: specifies the interrupt pending to clear.
* This parameter can be one of the following values:
* - 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_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)
* Output : None
* Return : None
*******************************************************************************/
void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, u32 I2C_IT)
{
u32 flagpos = 0;
u8 flagindex = 0;
/* Check the parameters */
assert(IS_I2C_CLEAR_IT(I2C_IT));
/* Get the I2C flag position */
flagpos = I2C_IT & I2C_FLAG_Mask;
/* Get the I2C flag index */
flagindex = I2C_IT >> 28;
/* Clear the flag by writing 0 */
if (flagindex == 1)
{
/* Clear the selected I2C flag */
I2Cx->SR1 &= ~flagpos;
}
/* Flags that need a read of the SR1 register to be cleared */
else if (flagindex == 2)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
}
/* Flags that need a read of SR1 and a write on CR2 registers to be cleared */
else if (flagindex == 6)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Write on the CR1 register */
I2Cx->CR1 |= CR1_PE_Set;
}
/* Flags that need a read of SR1 and a write on CR2 registers to be cleared */
else /*flagindex == 0xA*/
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Read the SR2 register */
(void)I2Cx->SR2;
}
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/