/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_i2c.c
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file provides all the I2C firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE 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 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 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 registers Masks */
#define CR1_CLEAR_Mask ((u16)0xFBF5)
/* 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 FREQ mask */
#define CR2_FREQ_Reset ((u16)0xFFC0)
/* I2C ADD0 mask */
#define OAR1_ADD0_Set ((u16)0x0001)
#define OAR1_ADD0_Reset ((u16)0xFFFE)
/* I2C ENDUAL mask */
#define OAR2_ENDUAL_Set ((u16)0x0001)
#define OAR2_ENDUAL_Reset ((u16)0xFFFE)
/* I2C ADD2 mask */
#define OAR2_ADD2_Reset ((u16)0xFF01)
/* I2C F/S mask */
#define CCR_FS_Set ((u16)0x8000)
/* I2C CCR mask */
#define CCR_CCR_Set ((u16)0x0FFF)
/* I2C FLAG mask */
#define FLAG_Mask ((u32)0x00FFFFFF)
/* I2C Interrupt Enable mask */
#define ITEN_Mask ((u32)0x07000000)
/* 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)
{
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(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 pclk1 = 8000000;
RCC_ClocksTypeDef rcc_clocks;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
assert_param(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 pclk1 frequency value */
RCC_GetClocksFreq(&rcc_clocks);
pclk1 = rcc_clocks.PCLK1_Frequency;
/* Set frequency bits depending on pclk1 value */
freqrange = (u16)(pclk1 / 1000000);
tmpreg |= freqrange;
/* Write to I2Cx CR2 */
I2Cx->CR2 = tmpreg;
/*---------------------------- I2Cx CCR Configuration ------------------------*/
/* Disable the selected I2C peripheral to configure TRISE */
I2Cx->CR1 &= CR1_PE_Reset;
/* 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)(pclk1 / (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 for standard mode */
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)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
}
else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
{
/* Fast mode speed calculate: Tlow/Thigh = 16/9 */
result = (u16)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
/* Set DUTY bit */
result |= I2C_DutyCycle_16_9;
}
/* Test if CCR val
