Example description
LoopBack
Example Description
This example provides a description of how to set a communication with the bxCAN
in loopback mode.
The CAN cell first performs a transmission and a reception of a standard data
frame by polling at 100 Kbits/s. The received frame is checked and some LEDs light
up to indicate whether the communication was successful. Then, an extended data
frame is transmitted at 500 Kbits/s. Reception is done in the interrupt handler
when the message becomes pending in the FIFO. Finally, the LEDs indicate if both
transmission and reception have been successful.
Directory contents
- CAN/LoopBack/stm32f10x_conf.h Library Configuration file
- CAN/LoopBack/stm32f10x_it.c Interrupt handlers
- CAN/LoopBack/stm32f10x_it.h Interrupt handlers header file
- CAN/LoopBack/main.c Main program
Hardware and Software environment
- This example runs on STM32F10x Connectivity line, High-Density, Medium-Density
and Low-Density Devices.
- This example has been tested with STMicroelectronics STM3210C-EVAL (STM32F10x
Connectivity line), STM3210E-EVAL (STM32F10x High-Density) and STM3210B-EVAL
(STM32F10x Medium-Density) evaluation boards and can be easily tailored to
any other supported device and development board.
To select the STMicroelectronics evaluation board used to run the example,
uncomment the corresponding line in stm32_eval.h file
- STM3210C-EVAL Set-up
- Use LED1, LED2, LED3 and LED4 connected respectively to PD.07, PD.13, PF.03
and PD.04 pins
- STM3210E-EVAL Set-up
- Use LD1, LD2, LD3 and LD4 leds connected respectively to PF.06, PF0.7,
PF.08 and PF.09 pins
- STM3210B-EVAL Set-up
- Use LD1, LD2, LD3 and LD4 leds connected respectively to PC.06, PC.07, PC.08
and PC.09 pins
How to use it ?
In order to make the program work, you must do the following :
- Create a project and setup all project configuration
- Add the required Library files :
- stm32f10x_can.c
- stm32f10x_rcc.c
- stm32f10x_exti.c
- stm32f10x_gpio.c
- misc.c
- stm32f10x_usart.c
- system_stm32f10x.c (under Libraries\CMSIS\Core\CM3)
- stm32_eval.c (under Utilities\STM32_EVAL)
- Edit stm32f10x.h file to select the device you are working on.
- Edit stm32_eval.h file to select the evaluation board you will use.
Tip: You can tailor the provided project template to run this example, for
more details please refer to "stm32f10x_stdperiph_lib_um.chm" user
manual; select "Peripheral Examples" then follow the instructions
provided in "How to proceed" section.
- Link all compiled files and load your image into target memory
- Run the example
note
- Low-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 16 and 32 Kbytes.
- Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 32 and 128 Kbytes.
- High-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 256 and 512 Kbytes.
- Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
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Normal
Example Description
This example shows how to configure the CAN peripheral to send and receive
CAN frames in normal mode. The sent frames are used to control Leds by presseing
key push button.
The CAN serial communication link is a bus to which a number of units may be
connected. This number has no theoretical limit. Practically the total number
of units will be limited by delay times and/or electrical loads on the bus line.
note This example is tested with a bus of 3 units. The same program example is
loaded in all units to send and receive frames.
The CAN is configured as follow:
- Bit Rate = 1 Mbit/s
- CAN Clock = external clock (HSE)
- ID Filter = All identifiers are allowed
- RTR = Data
- DLC = 1 byte
- Data: Led number that should be turned ON
Directory contents
- CAN/Normal/platform_config.h Hardware configuration header file
- CAN/Normal/stm32f10x_conf.h Library Configuration file
- CAN/Normal/stm32f10x_it.c Interrupt handlers
- CAN/Normal/stm32f10x_it.h Interrupt handlers header file
- CAN/Normal/main.c Main program
Hardware and Software environment
- This example runs on STM32F10x Connectivity line, High-Density, Medium-Density
and Low-Density Devices.
- This example has been tested with STMicroelectronics STM3210C-EVAL (STM32F10x
Connectivity line), STM3210E-EVAL (STM32F10x High-Density) and STM3210B-EVAL
(STM32F10x Medium-Density) evaluation boards and can be easily tailored to
any other supported device and development board.
To select the STMicroelectronics evaluation board used to run the example,
uncomment the corresponding line in CAN/Normal/platform_config.h or stm32_eval.h file
- STM3210C-EVAL Set-up
- Use LED1, LED2, LED3 and LED4 connected respectively to PD.07, PD.13, PF.03
and PD.04 pins
- Use Push Button connected to PB9
- Connect a female/female CAN cable between at least 2 EVAL CAN connectors
(on STM3210E-EVAL (CN2)/ STM3210C-EVAL (CN3) boards)
- Connector 1 DB9_PIN2 to Connector 2 DB9_PIN2 (CAN_L)
- Connector 1 DB9_PIN5 to Connector 2 DB9_PIN5 ( GND )
- Connector 1 DB9_PIN7 to Connector 2 DB9_PIN7 (CAN_H)
@note JP6 or JP5 must be fitted.
- STM3210E-EVAL Set-up
- Use LED1, LD2, LED3 and LED4 leds connected respectively to PF.06, PF0.7, PF.08
and PF.09 pins
- Use Push Button connected to PG8
- Connect a female/female CAN cable between at least 2 EVAL CAN connectors
(on STM3210B-EVAL (CN2)/ STM3210E-EVAL (CN4) boards)
- Connector 1 DB9_PIN2 to Connector 2 DB9_PIN2 (CAN_L)
- Connector 1 DB9_PIN5 to Connector 2 DB9_PIN5 ( GND )
- Connector 1 DB9_PIN7 to Connector 2 DB9_PIN7 (CAN_H)
@note JP6 must be fitted.
- STM3210B-EVAL Set-up
- Use LED1, LED2, LED3 and LED4 leds connected respectively to PC.06, PC.07, PC.08
and PC.09 pins
- Use Push Button connected to PB9
- Connect a female/female CAN cable between at least 2 EVAL CAN connectors
(on STM3210B-EVAL (CN2)/ STM3210E-EVAL (CN4) boards)
- Connector 1 DB9_PIN2 to Connector 2 DB9_PIN2 (CAN_L)
- Connector 1 DB9_PIN5 to Connector 2 DB9_PIN5 ( GND )
- Connector 1 DB9_PIN7 to Connector 2 DB9_PIN7 (CAN_H)
@note JP3 must be fitted.
note Any unit in the CAN bus may play the role of sender (by pressing on the
key) or receiver.
How to use it ?
In order to make the program work, you must do the following :
- Create a project and setup all project configuration
- Add the required Library files :
- stm32f10x_can.c
- stm32f10x_rcc.c
- stm32f10x_exti.c
- stm32f10x_gpio.c
- misc.c
- system_stm32f10x.c
- stm32f10x_usart.c
- system_stm32f10x.c (under Libraries\CMSIS\Core\CM3)
- stm32_eval.c (under Utilities\STM32_EVAL)
- Edit stm32f10x.h file to select the device you are working on.
- Edit CAN/Normal/platform_config.h file to select the evaluation board you will use.
- or edit stm32_eval.h file to select the evaluation board you will use.
Tip: You can tailor the provided project template to run this example, for
more details please refer to "stm32f10x_stdperiph_lib_um.chm" user
manual; select "Peripheral Examples" then follow the instructions
provided in "How to proceed" section.
- Link all compiled files and load your image into target memory
- Run the example
- In the first time the all leds are OFF.
- By Pressing on Key Button : LED1 turn ON and all other Leds are OFF, on the N
eval-boards connected to the bus.
- Press on Key Button again to send CAN Frame to command LEDn+1 ON, all other Leds
are OFF on the N eval-boards.
note
- Low-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 16 and 32 Kbytes.
- Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 32 and 128 Kbytes.
- High-density devices are STM32F101xx and STM32F103xx microcontrollers where
the Flash memory density ranges between 256 and 512 Kbytes.
- Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.