/*
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* i2c_bitbang.h
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*
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* Created on: Jan 19, 2023
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* Author: Wenxue
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*/
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#ifndef INC_I2C_BITBANG_H_
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#define INC_I2C_BITBANG_H_
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#include "stm32l4xx_hal.h"
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#define I2C_CLK_STRETCH_TIMEOUT 6000
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typedef enum i2c_num_e
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{
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I2CBUS0,
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I2CBUS1,
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I2CBUSMAX,
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} i2c_num_t;
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typedef struct i2c_gpio_s
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{
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GPIO_TypeDef *group; /* GPIO group */
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uint16_t pin; /* GPIO pin */
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} i2c_gpio_t;
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typedef struct i2c_bus_s
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{
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uint8_t bus; /* Bus number */
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uint8_t addr; /* Chip 7bits address */
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i2c_gpio_t scl; /* SCL GPIO pin */
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i2c_gpio_t sda; /* SDA GPIO pin */
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} i2c_bus_t;
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/*
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*+---------------------+
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*| I2C API functions |
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*+---------------------+
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*/
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/* I2C bus error number */
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enum{
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NO_ERROR = 0x00, // no error
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ACK_ERROR = 0x01, // no acknowledgment error
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CHECKSUM_ERROR = 0x02, // checksum mismatch error
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TIMEOUT_ERROR = 0x04, // timeout error
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PARM_ERROR = 0x80, // parameter out of range error
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};
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extern int i2c_init(uint8_t bus, uint8_t addr);
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extern int i2c_term(uint8_t bus);
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extern int i2c_read(uint8_t bus, uint8_t *buf, int size);
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extern int i2c_write(uint8_t bus, uint8_t *data, int bytes);
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extern void I2C_StartCondition(uint8_t bus);
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extern void I2C_StopCondition(uint8_t bus);
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/* I2C从设备芯片器件读写方向位器件地址 */
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#define R_ADDR(x) ((x)<<1 | 1) /* I2C地址最低位为1表示读 */
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#define W_ADDR(x) ((x)<<1 ) /* I2C地址最低位为0表示写 */
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enum
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{
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I2C_WR, /* 写方向 */
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I2C_RD, /* 读方向 */
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};
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extern uint8_t I2C_SendAddress(uint8_t bus, uint8_t dir);
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extern uint8_t I2C_WriteByte(uint8_t bus, uint8_t txByte);
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enum
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{
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ACK_NONE, /* 不回ACK */
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ACK, /* 回ACK */
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NAK, /* 回NAK */
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};
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extern uint8_t I2C_ReadByte(uint8_t bus, uint8_t *rxByte, uint8_t ack, uint32_t timeout);
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#endif /* INC_I2C_BITBANG_H_ */
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