一个稳定可靠的STM32 I2C程序Word文档格式.docx

1、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,unsigned char reg_addr,unsigned char len, unsigned char *data_ptr）;int Sensors_I2C_ReadRegis

2、ter_swap（unsigned char slave_addr,unsigned char reg_addr,unsigned char len, unsigned char *data_ptr）;int I2C_Reset_User（）;#endif / _I2C_H_/* i2c.c I2c 3 to communicate with the sensorsAuthor :* Includes */#include #include stm32l1xx.hi2c.hgpio.hlog.hdiscover_board.hmain.h/* Defines */#define I2Cx_FL

3、AG_TIMEOUT （uint32_t） 900）#define I2Cx_LONG_TIMEOUT （uint32_t）（300 * I2Cx_FLAG_TIMEOUT）#define SENSORS_I2C_SCL_GPIO_PORT GPIOB#define SENSORS_I2C_SCL_GPIO_CLK RCC_AHBPeriph_GPIOB#define SENSORS_I2C_SCL_GPIO_PIN GPIO_Pin_10#define SENSORS_I2C_SCL_GPIO_PINSOURCE GPIO_PinSource10#define SENSORS_I2C_SDA

4、_GPIO_PORT GPIOB#define SENSORS_I2C_SDA_GPIO_CLK RCC_AHBPeriph_GPIOB#define SENSORS_I2C_SDA_GPIO_PIN GPIO_Pin_11#define SENSORS_I2C_SDA_GPIO_PINSOURCE GPIO_PinSource11#define SENSORS_I2C_RCC_CLK RCC_APB1Periph_I2C2#define SENSORS_I2C_AF GPIO_AF_I2C2#define WAIT_FOR_FLAG（flag, value, timeout, errorco

5、de） I2CTimeout = timeout; while（I2C_GetFlagStatus（SENSORS_I2C, flag） != value） if（I2CTimeout-） = 0） return I2Cx_TIMEOUT_UserCallback（errorcode）; #define CLEAR_ADDR_BIT I2C_ReadRegister（SENSORS_I2C, I2C_Register_SR1）; I2C_ReadRegister（SENSORS_I2C, I2C_Register_SR2）;/* Globals */* Prototypes */* Funct

6、ion */static uint32_t I2Cx_TIMEOUT_UserCallback（char value）;void I2cMaster_Init（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

7、_GPIO_CLK | SENSORS_I2C_SDA_GPIO_CLK, ENABLE）; /* Configure I2Cx pin: SCL -*/ GPIO_InitStructure.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_

8、PuPd = GPIO_PuPd_NOPULL; /* Connect pins to Periph */ GPIO_PinAFConfig（SENSORS_I2C_SCL_GPIO_PORT, SENSORS_I2C_SCL_GPIO_PINSOURCE, SENSORS_I2C_AF）; GPIO_Init（SENSORS_I2C_SCL_GPIO_PORT, &GPIO_InitStructure）; SDA -*/ GPIO_InitStructure.GPIO_Pin = SENSORS_I2C_SDA_GPIO_PIN; GPIO_PinAFConfig（SENSORS_I2C_S

9、DA_GPIO_PORT, SENSORS_I2C_SDA_GPIO_PINSOURCE, SENSORS_I2C_AF）; GPIO_Init（SENSORS_I2C_SDA_GPIO_PORT, & 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

10、= I2C_Ack_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）;/* * brief Basic manag

11、ement of the timeout situation. * param None. * retval None. */static uint32_t I2Cx_TIMEOUT_UserCallback（char value） /* The following code allows I2C error recovery and return to normal communication if the error source doesnt still exist （ie. hardware issue.） */ I2C_GenerateSTOP（SENSORS_I2C, ENABLE

12、）; I2C_SoftwareResetCmd（SENSORS_I2C, ENABLE）; I2C_SoftwareResetCmd（SENSORS_I2C, DISABLE）;#ifdef User_debug MPL_LOGI（I2C Restarted.n）;#endif return 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）

13、* param RegisterAddr: The address （location） of the register to be written. * param RegisterValue: the Byte value to be written into destination register. * retval 0 if correct communication, else wrong communicationunsigned long Sensors_I2C_WriteRegister（unsigned char Address, unsigned char Registe

14、rAddr, unsigned short RegisterLen, const unsigned char *RegisterValue） uint32_t result = 0; uint32_t i = RegisterLen; _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 */ WAIT_FOR_FLAG （I2C_FLAG_SB, SET, I2Cx_FLAG_TIMEOUT, 2）; /* Transmit the slave address and enable writing operation */ I2C_Send7bitAddress（SENSORS_I2C, （AddressCR1 |