Updated stm32 driver driver#

When using this function, pay attention to, Enter the reference MemAddSize Represents the byte length of the register address, That is, there are a few bytes, Not the width ！, It could be theta I2C_MEMADD_SIZE_8BIT or I2C_MEMADD_SIZE_16BIT, Represent the 1 and 2. Of course, In addition to polling, And interruptions and DMA The way, Don't write here for the time being. HAL_StatusTypeDef HAL_I2C_Mem_Read(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, Uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout) HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c, uint16_t DevAddress,

Updated stm32 driver driver#

įor this kind of device ,HAL The library provides the following driver functions for reading and writing ： // Polling read / write As shown below EEPROM device AT24C02 Of IIC Operation sequence, You can see that in addition to the need DEVICE ADDRESS Outside, It also needs to be WORD ADDRESS, That is, the register address mentioned earlier. The first is a class of devices with registers, When reading and writing to this kind of device, it is often necessary to specify the register address. There are two types of IIC Device and corresponding HAL Library drive

But the one in the picture below is called theuit Netizens pointed out ：**“ Don't ST Don't you know ？ Is there any change ？”** at present, At least from the results of my tests, It can be concluded that ： use HAL Library to drive ST Of IIC That's all right.

Sum up some ：ST In order to avoid IIC Hardware patents, It's a little complicated to design, However, the standard driver library provided by it is not well adapted, Lead to some BUG. STM32 On IIC Some of the controversiesĪbout STM32 Of IIC drive, There are a lot of arguments on the Internet, What is the use of STM32 Built in hardware IIC Or use it IO Port and software simulation IIC Well ？ The figure below illustrates these arguments.