How to Convert From ISP to CAN

[Kenno]

Hi

I got this problem where I got an MCP2515 that wants an ISP type signal, and then converts it to CAN. I am only familier with the CAN protocol and the HAL library, so is there an easy way to make the STM32 convert the code from CAN to ISP?

[Tesla DeLorean]

ISP ? You mean SPI

You'll have to read the MCP2515 manual and write a driver that dispatches data you want sent via CAN, over the SPI bus in whatever Command/Data formatting the MCP2515 uses.

Perhaps there are other examples of using MCP2515 on an MCU you can use as a starting point?

Define Easy.. The HAL SPI implementation has several general examples of that symmetrical bus. Is there a cut-n-paste example you can simple copy? Hard to say, would suggest looking via Google and GitHub

[Andrew Neil]

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@Kenno wrote:

I got an MCP2515 that wants an ISP (sic) type signal

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So this:

As it says on the tin, it's a "Stand-Alone CAN Controller with SPI Interface" - not "ISP".

SPI is a very long-established and widely-used bused - you can find plenty of resources describing it; eg,

https://en.wikipedia.org/wiki/Serial_Peripheral_Interface

https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi/all

Yes, STM32s - including the HAL - support SPI

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@Kenno wrote:

is there an easy way to make the STM32 convert the code from CAN to ISP?

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I think you've missed the point of the MCP2515 !

It's the MCP2515 which does the "conversion" between CAN and SPI !

You'll need to start by studying the MCP2515 documentation:

https://www.microchip.com/en-us/product/mcp2515 

[SofLit]

Hello,

STM32F3 has CAN instance. So all you need is an external CAN transceiver like MCP2551 not a CAN controller. So could you please explain why you would plan to use MCP2515 chip (CAN/SPI controller)? 

[SofLit · Accepted solution]

+ Have a look at the following threads:

https://community.st.com/t5/stm32-mcus-products/mcp2515-with-stm32f429/m-p/109379

https://community.st.com/t5/stm32-mcus-products/mcp2515-module-library/td-p/220994