[Jihai APM32F4xx Tiny] Jihai APM32F407__IIC_STH30 (1)

尹小舟

[Jihai APM32F4xx Tiny] Jihai APM32F407__IIC_STH30 (1) [Copy link]

 

In this post, we will introduce the IIC function of APM32F4. In this post, we will use the I2C of APM32F407 to collect the temperature data of the external SHT30 and transmit the result to the computer through the serial port.

APM32F405xGw407xExG products have 3 hardware IICs inside, all of which can work in multi-master mode or slave mode, support 7-bit or 10-bit addressing, support dual slave address addressing in 7-bit slave mode, and support standard mode (up to 100kbit/s) and fast mode (up to 400kbit/s) communication rates; built-in hardware CRC generator/checker; they can use DMA operations and support SMBus bus version 2.0/PMBus bus.

Configurable I2C GPIO

• I2C1
  • SDA PB7 PB9
  • SCL PB6 PB8
• I2C2
  • SDA PF0 PH5 PB11
  • SCL PF1 PH4 PB10
• I2C3
  • SDA PH8 PC9
  • SCL PA8 PH7

Block Diagram

Library function introduction

I2C_Config_T structure

typedef struct
{
    uint32_t            clockSpeed;     /*!< I2C clock speed /
    I2C_MODE_T          mode;           /!< I2C mode /
    I2C_DUTYCYCLE_T     dutyCycle;      /!< I2C duty cycle /
    uint16_t            ownAddress1;    /!< I2C own address /
    I2C_ACK_T           ack;            /!< Acknowledge /
    I2C_ACK_ADDRESS_T   ackAddress;     /!< I2C acknowledged address */
} I2C_Config_T;

member	Functional Description
clockSpeed	I2C Clock Speed
mode	Specify the working mode, optional I2C mode and SMBUS mode
dutyCycle	Specify the clock duty cycle, optional low/high = 2:1 and 16:9 modes
ownAddress1	Specify its own I2C device address
ack	Enable or disable response (usually enabled)
ackAddress	Specifies the length of the address, which can be 7 or 10 bits.

Function Prototype	void I2C_Reset(I2C_T* i2c)
Functional Description	Reset peripheral I2C
Input parameters {in}
i2c	I2C1 or I2C2, I2C3

Function Prototype	void I2C_Config(I2C_T* i2c, I2C_Config_T* i2cConfig)
Functional Description	Configure I2C via I2C_Config_T
Input parameters {in}

Function Prototype	void I2C_ConfigStructInit(I2C_Config_T* i2cConfig)
Functional Description	Fill each I2C_InitStruct member with default values.
Input parameters {in}

Function Prototype	void I2C_Enable(I2C_T* i2c)
Functional Description	Implementing I2C
Input parameters {in}

Function Prototype	void NVIC_EnableIRQRequest(IRQn_Type irq, uint8_t preemptionPriority, uint8_t subPriority)
Functional Description	Enable NVIC request
Input parameters {in}

Example: /* NVIC configuration */ NVIC_EnableIRQRequest(I2C1_EV_IRQn, 1, 0);

Function Prototype	void I2C_DisableDualAddress(I2C_T* i2c)
Functional Description	Disables the specified I2C dual addressing mode.
Input parameters {in}

Function Prototype	void I2C_EnableInterrupt(I2C_T* i2c, uint16_t interrupt)
Functional Description	Enable the specified I2C interrupt.
Input parameters {in}

Function Prototype	uint8_t I2C_ReadIntFlag(I2C_T* i2c, I2C_INT_FLAG_T flag)
Functional Description	Check if I2C interrupt is set
Input parameters {in}

I2C_INT_FLAG_T flag value

I2C_INT_FLAG_T	describe
I2C_INT_FLAG_SMBALT	SMBus Alert Flag
I2C_INT_FLAG_TTE	Timeout or Tlow error flag
I2C_INT_FLAG_PECE	PEC error in receive flags
I2C_INT_FLAG_OVRUR	Overflow/Underload Flag (Slave Mode)
I2C_INT_FLAG_AE	Confirm error flag
I2C_INT_FLAG_AL	Arbitration lost flag (master mode)
I2C_INT_FLAG_BERR	Confirm error flag
I2C_INT_FLAG_TXBE	Transmitter data register empty flag
I2C_INT_FLAG_RXBNE	Receiver data register not empty flag
I2C_INT_FLAG_STOP	Stop detection flag (slave mode)
I2C_INT_FLAG_ADDR10	0-bit header sending flag (host mode)
I2C_INT_FLAG_BTC	Byte transfer complete flag
I2C_INT_FLAG_ADDR	Address send flag (host mode)
I2C_INT_FLAG_START	Start bit flag (host mode)

Function Prototype	uint8_t I2C_ReadStatusFlag(I2C_T* i2c, I2C_FLAG_T flag)
Functional Description	Check if the I2C flag is set
Input parameters {in}