stm32 at24c256 hal
时间: 2023-09-22 11:11:26 浏览: 45
The STM32 is a family of microcontrollers developed by STMicroelectronics. The AT24C256 is an EEPROM memory IC manufactured by Atmel.
The HAL (Hardware Abstraction Layer) is a software library provided by STMicroelectronics for the STM32 microcontroller family. It provides an easy-to-use API for accessing the various peripherals and features of the microcontroller.
To use the AT24C256 with an STM32 microcontroller, you would typically use the I2C interface to communicate with the memory IC. The HAL provides functions for setting up and configuring the I2C interface, as well as for reading and writing data to the memory IC.
Here is an example of how to use the HAL to read data from the AT24C256:
1. Initialize the I2C interface using the HAL_I2C_Init() function.
2. Send a start condition using the HAL_I2C_Master_Transmit() function.
3. Send the device address (0xA0 for write, 0xA1 for read) using the HAL_I2C_Master_Transmit() function.
4. Send the memory address to read from using the HAL_I2C_Master_Transmit() function.
5. Send another start condition using the HAL_I2C_Master_Receive() function.
6. Receive the data from the memory IC using the HAL_I2C_Master_Receive() function.
7. Send a stop condition using the HAL_I2C_Master_Transmit() function.
Here is some sample code:
```c
// Initialize I2C interface
HAL_I2C_Init(&hi2c1);
// Read data from AT24C256
uint8_t data[2];
uint16_t mem_address = 0x1234;
// Send start condition
HAL_I2C_Master_Transmit(&hi2c1, 0xA0, &mem_address, 2, 100);
// Send memory address to read from
HAL_I2C_Master_Transmit(&hi2c1, 0xA0, &mem_address, 2, 100);
// Send start condition again
HAL_I2C_Master_Receive(&hi2c1, 0xA1, data, 2, 100);
// Receive data from memory IC
HAL_I2C_Master_Receive(&hi2c1, 0xA1, data, 2, 100);
// Send stop condition
HAL_I2C_Master_Transmit(&hi2c1, 0xA0, 0, 0, 100);
```