117 lines
5.5 KiB
Plaintext
117 lines
5.5 KiB
Plaintext
/**
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@page I2C_EEPROM I2C EEPROM DMA example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file I2C/I2C_EEPROM/readme.txt
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* @author MCD Application Team
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* @brief Description of the I2C EEPROM DMA example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to handle I2C data buffer transmission/reception with DMA. In the example,
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the device communicates with an I2C EEPROM memory.
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SCL Pin: PB.06
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SDA Pin: PB.07
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__________________________________________________________________________
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| ______________ ______________ |
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| | I2C1 | | I2C_EEPROM| |
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| | | | | |
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| | SCL|______________________|CLOCK | |
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| | | | | |
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| | | | | |
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| | | | | |
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| | SDA|______________________|DATA | |
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| |______________| |______________| |
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| __ |
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| |__| |
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| TAMPER |
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|__________________________________________________________________________|
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STM32072B-EVAL RevB
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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Then the SystemClock_Config() function is used to configure the system
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clock (SYSCLK) to run at 48 MHz.
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The I2C peripheral configuration is ensured by the HAL_I2C_Init() function.
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This later is calling the HAL_I2C_MspInit()function which core is implementing
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the configuration of the needed I2C resources according to the used hardware (CLOCK,
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GPIO, DMA and NVIC). You may update this function to change I2C configuration.
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The I2C/EEPROM communication is then initiated.
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The HAL_I2C_Mem_Read_DMA() and the HAL_I2C_Mem_Write_DMA() functions allow respectively
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the reception of Data from EEPROM and the transmission of a predefined data
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buffer.
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For this example the TxBuffer is predefined and the aRxBuffer size is same as aTxBuffer.
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In a first step the I2C writes the aTxBuffer by group of 4 bytes (RF EEPROM
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Page size) using HAL_I2C_Mem_Write_DMA() then read back the data through aRxBuffer
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using HAL_I2C_Mem_Read_DMA().
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The end of this two steps are monitored through the HAL_I2C_GetState() function
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result.
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Finally, aRxBuffer and aRxBuffer are compared through Buffercmp() in order to
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check buffers correctness.
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STM32 Eval board's LEDs can be used to monitor the transfer status:
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- LED1 is ON when the transmission process is complete.
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- LED2 is ON when the reception process is complete.
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- LED3 is ON when there is an error in transmission/reception process.
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@note I2Cx instance used and associated resources can be updated in "main.h"
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file depending hardware configuration used.
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@par Directory contents
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- I2C/I2C_EEPROM/Inc/stm32f0xx_hal_conf.h HAL configuration file
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- I2C/I2C_EEPROM/Inc/stm32f0xx_it.h Interrupt handlers header file
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- I2C/I2C_EEPROM/Inc/main.h Header for main.c module
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- I2C/I2C_EEPROM/Src/stm32f0xx_it.c Interrupt handlers
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- I2C/I2C_EEPROM/Src/main.c Main program
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- I2C/I2C_EEPROM/Src/system_stm32f0xx.c STM32F0xx system source file
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- I2C/I2C_EEPROM/Src/stm32f0xx_hal_msp.c HAL MSP file
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@par Hardware and Software environment
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- This example runs on STM32F072VB devices.
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- This example has been tested with STM32072B-EVAL RevB board and can be
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easily tailored to any other supported device and development board.
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- STM32072B-EVAL RevB Set-up
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- When communicating with M24LR64 EEPROM, make sure that ANT7-M24LR (MB1020 A-01) or ANT7-M24LR (MB1020 A-02) is inserted in CN2 connector.
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- The user can choose between ANT7-M24LR (MB1020 A-01) and ANT7-M24LR (MB1020 A-02) through "#define EEPROM_ADDRESS" in the "main.c" file:
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- If the ANT7-M24LR (MB1020 A-01) is used, the "#define EEPROM_ADDRESS 0xA0" must be uncommented and the "#define EEPROM_ADDRESS 0xA6" must be commented.
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- If the ANT7-M24LR (MB1020 A-02) is used, the "#define EEPROM_ADDRESS 0xA6" must be uncommented and the "#define EEPROM_ADDRESS 0xA0" must be commented.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files: Project->Rebuild all
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- Load project image: Project->Download and Debug
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- Run program: Debug->Go(F5)
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*/
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