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stm32f103-minimum: Update README.txt to use MCP2515 module

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Alan C. Assis 2021-02-28 12:33:11 -03:00 committed by Xiang Xiao
parent 151cf49562
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boards/arm/stm32/stm32f103-minimum/README.txt
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@ -536,6 +536,32 @@ USB Console support:
and it will create a /dev/ttyACM0 device in the Linux. Use minicom with this
device to get access to NuttX NSH console (press Enter three times to start)
MCP2515 External Module
=======================
You can use an external MCP2515 (tested with NiRen MCP2515_CAN module) to
get CAN Bus working on STM32F103C8 chip (remember the internal CAN cannot
work with USB at same time because they share the SRAM buffer).
You can connect the MCP2515 module in the STM32F103 Minimum board this way:
connect PA5 (SPI1 CLK) to SCK; PA7 (SPI1 MOSI) to SI; PA6 (SPI MISO) to SO;
PA4 to CS; B0 to INT. Also connect 5V to VCC and GND to GND.
Note: Although MCP2515 can work with 2.7V-5.5V it is more stable when using
it on BluePill board on 5V.
Testing: you will need at least 2 boards each one with a MCP2515 module
connected to it. Connect CAN High from the first module to the CAN High of
the second module, and the CAN Low from the first module to the CAN Low of
the second module.
You need to modify the "CAN example" application on menuconfig and create
two firmware versions: the first firmware will be Read-only and the second
one Write-only. Flash the first firmware in the first board and the second
firmware in the second board. Now you can start the both boards, run the
"can" command in the Write-only board and then run the "can" command in the
Read-only board. You should see the data coming.
STM32F103 Minimum - specific Configuration Options
==================================================