一个稳定可靠的STMIC程序

1、/*File: i2c.hPurpose :*/#ifndef _I2C_H_#define _I2C_H_/* Includes */* Defines */#define SENSORS_I2CI2C2#define I2C_SPEED400000#define I2C_OWN_ADDRESS0x00#define I2C_Config() I2cMaster_Init();/* Prototypes */void I2cMaster_Init(void);unsigned long Sensors_I2C_WriteRegister(unsigned char Address, unsi

2、gned char RegisterAddr, unsigned short RegisterLen, const unsigned char *RegisterValue);unsigned long Sensors_I2C_ReadRegister(unsigned char Address, unsigned char RegisterAddr, unsigned short RegisterLen, unsigned char *RegisterValue);int Sensors_I2C_WriteRegister_swap(unsigned char slave_addr,unsi

3、gned char reg_addr,unsigned char len, unsigned char *data_ptr); int Sensors_I2C_ReadRegister_swap(unsigned char slave_addr,unsigned char reg_addr,unsigned char len, unsigned char *data_ptr); int I2C_Reset_User();#endif / _I2C_H_/*File: i2c.cPurpose : I2c 3 to communicate with the sensorsAuthor :* In

4、cludes */#include <stdio.h>#include "stm32l1xx.h"#include "i2c.h"#include "gpio.h"#include "log.h"#include "discover_board.h"#include "main.h"/* Defines */#define I2Cx_FLAG_TIMEOUT(uint32_t) 900)#define I2Cx_LONG_TIMEOUT(uint32_t)(300

5、 * I2Cx_FLAG_TIMEOUT)#define SENSORS_I2C_SCL_GPIO_PORTGPIOB#define SENSORS_I2C_SCL_GPIO_CLKRCC_AHBPeriph_GPIOB#define SENSORS_I2C_SCL_GPIO_PINGPIO_Pin_10#define SENSORS_I2C_SCL_GPIO_PINSOURCE GPIO_PinSource10#define SENSORS_I2C_SDA_GPIO_PORTGPIOB#define SENSORS_I2C_SDA_GPIO_CLKRCC_AHBPeriph_GPIOB#de

6、fine SENSORS_I2C_SDA_GPIO_PINGPIO_Pin_11#define SENSORS_I2C_SDA_GPIO_PINSOURCEGPIO_PinSource11#define SENSORS_I2C_RCC_CLK #define SENSORS_I2C_AFRCC_APB1Periph_I2C2GPIO_AF_I2C2#define WAIT_FOR_FLAG(flag, value, timeout, errorcode) I2CTimeout = timeout;while(I2C_GetFlagStatus(SENSORS_I2C, flag) != val

7、ue) if(I2CTimeout-) = 0) return I2Cx_TIMEOUT_UserCallback(errorcode); #define CLEAR_ADDR_BITI2C_ReadRegister(SENSORS_I2C, I2C_Register_SR1);I2C_ReadRegister(SENSORS_I2C, I2C_Register_SR2);/* Globals */* Prototypes */* Function */static uint32_t I2Cx_TIMEOUT_UserCallback(char value);void I2cMaster_In

8、it(void)GPIO_InitTypeDef GPIO_InitStructure;I2C_InitTypeDef I2C_InitStructure;/* Enable I2Cx clock */RCC_APB1PeriphClockCmd(SENSORS_I2C_RCC_CLK, ENABLE);/* Enable I2C GPIO clock */RCC_AHBPeriphClockCmd(SENSORS_I2C_SCL_GPIO_CLK | SENSORS_I2C_SDA_GPIO_CLK, ENABLE);/* Configure I2Cx pin: SCL -*/GPIO_In

9、itStructure.GPIO_Pin = SENSORS_I2C_SCL_GPIO_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;/* Connect pins to Periph */GPIO_PinAFConfig(SENSORS_I2C_SCL_GPIO

10、_PORT, SENSORS_I2C_SCL_GPIO_PINSOURCE, SENSORS_I2C_AF); GPIO_Init(SENSORS_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);/* Configure I2Cx pin: SDA -*/GPIO_InitStructure.GPIO_Pin = SENSORS_I2C_SDA_GPIO_PIN;/* Connect pins to Periph */GPIO_PinAFConfig(SENSORS_I2C_SDA_GPIO_PORT, SENSORS_I2C_SDA_GPIO_PINS

11、OURCE, SENSORS_I2C_AF); GPIO_Init(SENSORS_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);I2C_DeInit(SENSORS_I2C);I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;I2C_InitStructure.I2C_OwnAddress1 = I2C_OWN_ADDRESS;I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;I2C

12、_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;/* Enable the I2C peripheral */I2C_Cmd(SENSORS_I2C, ENABLE);/* Initialize the I2C peripheral */I2C_Init(SENSORS_I2C, &I2C_InitStructure);/* brief Basic management of the timeout sit

13、uation.* param None.* retval None.*/static uint32_t I2Cx_TIMEOUT_UserCallback(char value)/* The following code allows I2C error recovery and return to normal communicationif the error source doesn't still exist (ie. hardware issue.) */I2C_InitTypeDef I2C_InitStructure;I2C_GenerateSTOP(SENSORS_I2

14、C, ENABLE);I2C_SoftwareResetCmd(SENSORS_I2C, ENABLE);I2C_SoftwareResetCmd(SENSORS_I2C, DISABLE);I2C_DeInit(SENSORS_I2C);I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;I2C_InitStructure.I2C_OwnAddress1 = I2C_OWN_ADDRESS;I2C_InitStructure.I2C_Ack = I2C_Ack_

15、Enable;I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;/* Enable the I2C peripheral */I2C_Cmd(SENSORS_I2C, ENABLE);/* Initialize the I2C peripheral */I2C_Init(SENSORS_I2C, &I2C_InitStructure);#ifdef User_debugMPL_LOGI("I2

16、C Restarted.n");#endifreturn 1;int I2C_Reset_User()return I2Cx_TIMEOUT_UserCallback(0);/* brief Writes a Byte to a given register to the sensors through the control interface (I2C)* param RegisterAddr: The address (location) of the register to be written.* param RegisterValue: the Byte value to

17、 be written into destination register.* retval 0 if correct communication, else wrong communication*/unsigned long Sensors_I2C_WriteRegister(unsigned char Address, unsigned char RegisterAddr, unsigned short RegisterLen, const unsignedchar *RegisterValue)uint32_t result = 0;uint32_t i = RegisterLen;_

18、IO uint32_t I2CTimeout = I2Cx_LONG_TIMEOUT;/RegisterValue = RegisterValue + (RegisterLen - 1);/* Wait for the busy flag to be cleared */WAIT_FOR_FLAG (I2C_FLAG_BUSY, RESET, I2Cx_LONG_TIMEOUT, 1);/* Start the config sequence */I2C_GenerateSTART(SENSORS_I2C, ENABLE);/* Wait for the start bit to be set

19、 */WAIT_FOR_FLAG (I2C_FLAG_SB, SET, I2Cx_FLAG_TIMEOUT, 2);/* Transmit the slave address and enable writing operation */I2C_Send7bitAddress(SENSORS_I2C, (Address<<1), I2C_Direction_Transmitter);/* Wait for address bit to be set */WAIT_FOR_FLAG (I2C_FLAG_ADDR, SET, I2Cx_FLAG_TIMEOUT, 3);/* clear

20、 the ADDR interrupt bit - this is done by reading SR1 and SR2*/CLEAR_ADDR_BIT/* Wait for address bit to be set */WAIT_FOR_FLAG (I2C_FLAG_TXE, SET, I2Cx_FLAG_TIMEOUT, 4);/* Transmit the first address for write operation */I2C_SendData(SENSORS_I2C, RegisterAddr);while (i-)/* Wait for address bit to be

21、 set */WAIT_FOR_FLAG (I2C_FLAG_TXE, SET, I2Cx_FLAG_TIMEOUT, 5);/* Prepare the register value to be sent */I2C_SendData(SENSORS_I2C, *RegisterValue-);I2C_SendData(SENSORS_I2C, *RegisterValue+);/* Wait for address bit to be set */WAIT_FOR_FLAG (I2C_FLAG_BTF, SET, I2Cx_FLAG_TIMEOUT, 6);/* End the confi

22、guration sequence */I2C_GenerateSTOP(SENSORS_I2C, ENABLE);/* Return the verifying value: 0 (Passed) or 1 (Failed) */return result;unsigned long Sensors_I2C_ReadRegister(unsigned char Address, unsigned char RegisterAddr, unsigned short RegisterLen, unsigned char*RegisterValue)uint32_t result = 0;uint

23、8_t bytesRemaining = RegisterLen;_IO uint32_t I2CTimeout = I2Cx_LONG_TIMEOUT;/* Wait for the busy flag to be cleared */WAIT_FOR_FLAG (I2C_FLAG_BUSY, RESET, I2Cx_LONG_TIMEOUT, 7);/* Start the config sequence */I2C_GenerateSTART(SENSORS_I2C, ENABLE);/* Wait for the start bit to be set */WAIT_FOR_FLAG

24、(I2C_FLAG_SB, SET, I2Cx_FLAG_TIMEOUT, 8);/* Transmit the slave address and enable writing operation */I2C_Send7bitAddress(SENSORS_I2C, (Address<<1), I2C_Direction_Transmitter);/* Wait for the start bit to be set */WAIT_FOR_FLAG (I2C_FLAG_ADDR, SET, I2Cx_FLAG_TIMEOUT, 9);/* clear the ADDR inter

25、rupt bit - this is done by reading SR1 and SR2*/CLEAR_ADDR_BIT;/* Wait for address bit to be set */WAIT_FOR_FLAG (I2C_FLAG_TXE, SET, I2Cx_FLAG_TIMEOUT, 10);/* Transmit the register address to be read */I2C_SendData(SENSORS_I2C, RegisterAddr);/* Wait for address bit to be set */WAIT_FOR_FLAG (I2C_FLA

26、G_TXE, SET, I2Cx_FLAG_TIMEOUT, 11);/*!< Send START condition a second time */I2C_GenerateSTART(SENSORS_I2C, ENABLE);/* Wait for the start bit to be set */WAIT_FOR_FLAG (I2C_FLAG_SB, SET, I2Cx_FLAG_TIMEOUT, 12);/*!< Send address for read */I2C_Send7bitAddress(SENSORS_I2C, (Address<<1), I2

27、C_Direction_Receiver);/* Wait for the start bit to be set */WAIT_FOR_FLAG (I2C_FLAG_ADDR, SET, I2Cx_FLAG_TIMEOUT, 13);if (RegisterLen = 1) /*!< Disable Acknowledgment */I2C_AcknowledgeConfig(SENSORS_I2C, DISABLE);/* clear the ADDR interrupt bit - this is done by reading SR1 and SR2*/CLEAR_ADDR_BI

28、T;/*!< Send STOP Condition */I2C_GenerateSTOP(SENSORS_I2C, ENABLE);/* Wait for the RXNE bit to be set */WAIT_FOR_FLAG (I2C_FLAG_RXNE, SET, I2Cx_FLAG_TIMEOUT, 14);/bytesRemaining-;/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);RegisterValue0 = I2C_ReceiveData(SENSORS_I2C); else if( Re

29、gisterLen = 2) /*!< Disable Acknowledgment */I2C_AcknowledgeConfig(SENSORS_I2C, DISABLE);/* Set POS bit */SENSORS_I2C->CR1 |= I2C_CR1_POS;/* clear the ADDR interrupt bit - this is done by reading SR1 and SR2*/CLEAR_ADDR_BIT;/* Wait for the buffer full bit to be set */WAIT_FOR_FLAG (I2C_FLAG_BT

30、F, SET, I2Cx_FLAG_TIMEOUT, 15);/*!< Send STOP Condition */I2C_GenerateSTOP(SENSORS_I2C, ENABLE);/* Read 2 bytes */bytesRemaining-;/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);RegisterValue0 = I2C_ReceiveData(SENSORS_I2C);R

31、egisterValue1 = I2C_ReceiveData(SENSORS_I2C); else /* more than 2 bytes */* clear the ADDR interrupt bit - this is done by reading SR1 and SR2*/ CLEAR_ADDR_BIT;while(bytesRemaining)if( bytesRemaining = 3)/* Wait for the buffer full bit to be set */WAIT_FOR_FLAG (I2C_FLAG_BTF, SET, I2Cx_FLAG_TIMEOUT,

32、 16);/*!< Disable Acknowledgment */I2C_AcknowledgeConfig(SENSORS_I2C, DISABLE);/* Read 1 bytes */bytesRemaining-;/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);*RegisterValue+ = I2C_ReceiveData(SENSORS_I2C);/*!< Send STOP Condition */I2C_GenerateSTOP(SENSORS_I2C, ENABLE);/* Read 1

33、 bytes */bytesRemaining-;/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);*RegisterValue+ = I2C_ReceiveData(SENSORS_I2C);/* Wait for the buffer full bit to be set */WAIT_FOR_FLAG (I2C_FLAG_RXNE, SET, I2Cx_FLAG_TIMEOUT, 17);/* Read 1 bytes */bytesRemaining-;/RegisterValuebytesRemaining = I

34、2C_ReceiveData(SENSORS_I2C);*RegisterValue+ = I2C_ReceiveData(SENSORS_I2C);else/* Wait for the RXNE bit to be set */WAIT_FOR_FLAG (I2C_FLAG_RXNE, SET, I2Cx_FLAG_TIMEOUT, 18);/* Read 2 bytes */bytesRemaining-;/RegisterValuebytesRemaining = I2C_ReceiveData(SENSORS_I2C);*RegisterValue+ = I2C_ReceiveDat

35、a(SENSORS_I2C);/* Clear BTF flag */I2C_ClearFlag(SENSORS_I2C, I2C_FLAG_BTF);/* Wait for the busy flag to be cleared */WAIT_FOR_FLAG (I2C_FLAG_BUSY, RESET, I2Cx_LONG_TIMEOUT, 19);/*!< Re-Enable Acknowledgment to be ready for another reception */I2C_AcknowledgeConfig(SENSORS_I2C, ENABLE);/Disable POS - TODOSENSORS_I2C->CR