mirror of
https://github.com/STMicroelectronics/STM32CubeF0.git
synced 2025-05-05 19:29:46 +08:00
155 lines
7.5 KiB
Plaintext
155 lines
7.5 KiB
Plaintext
/**
|
|
@page I2C_TwoBoards_AdvComIT I2C Two Boards Advanced Communication IT example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
|
|
* @file I2C/I2C_TwoBoards_AdvComIT/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the I2C Two Boards Advanced Communication with
|
|
* Interrupt example.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* This software component is licensed by ST under BSD 3-Clause license,
|
|
* the "License"; You may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at:
|
|
* opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
******************************************************************************
|
|
@endverbatim
|
|
|
|
@par Example Description
|
|
|
|
How to handle I2C data buffer transmission/reception between two boards,
|
|
using an interrupt.
|
|
|
|
Board: STM32F070RB-Nucleo RevC (embeds a STM32F070RBT6 device)
|
|
SCL Pin: PB6 (CN10, pin17)
|
|
SDA Pin: PB7 (CN7, pin21)
|
|
|
|
_________________________ _________________________
|
|
| ______________| |______________ |
|
|
| |I2C1 | | I2C1| |
|
|
| | | | | |
|
|
| | SCL |_____________________| SCL | |
|
|
| | | | | |
|
|
| | | | | |
|
|
| | | | | |
|
|
| | SDA |_____________________| SDA | |
|
|
| | | | | |
|
|
| |______________| |______________| |
|
|
| | | |
|
|
| GND|_____________________|GND |
|
|
|_STM32_Board 1___________| |_STM32_Board 2___________|
|
|
|
|
At the beginning of the main program the HAL_Init() function is called to reset
|
|
all the peripherals, initialize the Flash interface and the systick.
|
|
Then the SystemClock_Config() function is used to configure the system
|
|
clock (SYSCLK) to run at 48 MHz.
|
|
|
|
The I2C peripheral configuration is ensured by the HAL_I2C_Init() function.
|
|
This later is calling the HAL_I2C_MspInit()function which core is implementing
|
|
the configuration of the needed I2C resources according to the used hardware (CLOCK,
|
|
GPIO and NVIC). You may update this function to change I2C configuration.
|
|
|
|
The I2C communication is then initiated.
|
|
The project is split in two parts: the Master Board and the Slave Board
|
|
- Master Board
|
|
The HAL_I2C_Master_Receive_IT() and the HAL_I2C_Master_Transmit_IT() functions
|
|
allow respectively the reception and the transmission of a predefined data buffer
|
|
in Master mode using interrupt.
|
|
- Slave Board
|
|
The HAL_I2C_Slave_Receive_IT() and the HAL_I2C_Slave_Transmit_IT() functions
|
|
allow respectively the reception and the transmission of a predefined data buffer
|
|
in Slave mode using interrupt.
|
|
The user can choose between Master and Slave through "#define MASTER_BOARD"
|
|
in the "main.c" file:
|
|
- Uncomment "#define MASTER_BOARD" to select Master board.
|
|
- Comment "#define MASTER_BOARD" to select Slave board.
|
|
|
|
For this example two buffers are used
|
|
- aTxBuffer buffer contains the data to be transmitted
|
|
- aRxBuffer buffer is used to save the received data
|
|
Note that both buffers have same size
|
|
|
|
On Master board side:
|
|
- Wait User push-button to be pressed (used for only synchronization at startup)
|
|
- Request write operation by sending specific command "MASTER_REQ_WRITE" to Slave
|
|
- Send the number of data to be written
|
|
- Transmit aTxBuffer buffer to slave
|
|
- Request read operation by sending specific command "MASTER_REQ_READ" to Slave
|
|
- Send the number of data to be read
|
|
- Receive data from Slave in aRxBuffer
|
|
- Check the correctness of data and Toggle LED2 when data is received correctly,
|
|
otherwise LED2 is slowly blinking (1 sec. period) and communication is stopped (using infinite loop)
|
|
|
|
|
|
On Slave board side:
|
|
- Receive request from Master
|
|
- Receive the request operation from Master and depending on the operation type (write or read):
|
|
- If Master requests write operation:
|
|
- Receive number of data to be written by Master
|
|
- Receive data from master in aRxBuffer
|
|
- Check the correctness of data and Toggle LED2 when data is received correctly,
|
|
otherwise LED2 is slowly blinking (1 sec. period) and communication is stopped (using infinite loop)
|
|
- If Master request read operation:
|
|
- Receive number of data to be written to Master
|
|
- Transmit aTxBuffer buffer to master
|
|
|
|
These operations are repeated periodically and the start of communication is triggered
|
|
by pushing the key button of the Master board.
|
|
|
|
@note In Master side, only Acknowledge failure error is handled. When this error
|
|
occurs Master restart the current operation until Slave acknowledges it's
|
|
address.
|
|
|
|
@note I2Cx instance used and associated resources can be updated in "main.h"
|
|
file depending hardware configuration used.
|
|
|
|
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
|
|
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
|
|
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
|
|
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
|
|
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
|
|
|
|
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
|
|
to have correct HAL operation.
|
|
|
|
@par Directory contents
|
|
|
|
- I2C/I2C_TwoBoards_AdvComIT/Inc/stm32f0xx_hal_conf.h HAL configuration file
|
|
- I2C/I2C_TwoBoards_AdvComIT/Inc/stm32f0xx_it.h I2C interrupt handlers header file
|
|
- I2C/I2C_TwoBoards_AdvComIT/Inc/main.h Header for main.c module
|
|
- I2C/I2C_TwoBoards_AdvComIT/Src/stm32f0xx_it.c I2C interrupt handlers
|
|
- I2C/I2C_TwoBoards_AdvComIT/Src/main.c Main program
|
|
- I2C/I2C_TwoBoards_AdvComIT/Src/system_stm32f0xx.c STM32F0xx system source file
|
|
- I2C/I2C_TwoBoards_AdvComIT/Src/stm32f0xx_hal_msp.c HAL MSP file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F070RB devices.
|
|
|
|
- This example has been tested with STM32F070RB-Nucleo RevC board and can be
|
|
easily tailored to any other supported device and development board.
|
|
|
|
- STM32F070RB-Nucleo RevC Set-up
|
|
- Connect I2C_SCL line of Master board (PB6, CN10, pin17) to I2C_SCL line of Slave Board (PB6, CN10, pin17).
|
|
- Connect I2C_SDA line of Master board (PB7, CN7, pin21) to I2C_SDA line of Slave Board (PB7, CN7, pin21).
|
|
- Connect GND of Master board to GND of Slave Board.
|
|
|
|
@par How to use it ?
|
|
|
|
In order to make the program work, you must do the following :
|
|
- Open your preferred toolchain
|
|
- Rebuild all files and load your image into target memory
|
|
o Uncomment "#define MASTER_BOARD" and load the project in Master Board
|
|
o Comment "#define MASTER_BOARD" and load the project in Slave Board
|
|
- Run the example
|
|
|
|
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
|
|
*/
|