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new b1dc219 stm32f103-minimum: Update README.txt to use MCP2515 module
b1dc219 is described below
commit b1dc2199be5fbe20e60438acdb997bbdf8e16a44
Author: Alan C. Assis <acas...@gmail.com>
AuthorDate: Sun Feb 28 12:33:11 2021 -0300
stm32f103-minimum: Update README.txt to use MCP2515 module
---
boards/arm/stm32/stm32f103-minimum/README.txt | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/boards/arm/stm32/stm32f103-minimum/README.txt
b/boards/arm/stm32/stm32f103-minimum/README.txt
index 0c0a031..a8404fd 100644
--- a/boards/arm/stm32/stm32f103-minimum/README.txt
+++ b/boards/arm/stm32/stm32f103-minimum/README.txt
@@ -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
==================================================
