[STM32F4 Disco] Connect CAN 1 RX to EXTI 0

[nikofionn]

Posted on July 23, 2014 at 22:35

 

 

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[Tesla DeLorean]

Posted on July 23, 2014 at 22:40

This forum software does not support posting from mobile devices (Phones, Tablets).

Perhaps if it's connected to PD0?

[nikofionn]

Posted on July 24, 2014 at 10:32

****update****

I just had a quick chat with an STM engineer, who told me, that what I am trying to do, will not work...

There is no way to connect the interrupt behind the CAN filter to an EXTI line, because they are not working in STOP-Mode.

So, there are two ways left to get a quick solution (without changing hardware):

- Enter STOP-Mode via WFE - Wait for event. This would wake up the MCU without an ISR, which would be fine for now.

- Enable the EXTI line connected to RX-Pin just before entering STOP-Mode and disabling the EXTI line again after wake up. Otherwise an Interrupt would occur with any CAN message, which is not my aim.

I will try to get the STOP-Mode working using the WFE - sequence. Can anybody give me some hints? I will post my code later on ;)

*********

Good morning clive1,

I reworked my posting, as I did not know, thath mobile devices are not supported :)

Kind regards,

Niko

[Tesla DeLorean]

Posted on July 24, 2014 at 16:18

Your EXTI configuration is wrong

// EXT_INT0 connect to Pin0 [GPIOD] = RX-PIN

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, GPIO_Pin_0);

Should be

// EXT_INT0 connect to Pin PD0

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource0); 

Whether the state of the pin is usable is debatable, not sure the if you want an Event, if you configured an Interrupt. I'd go for WFI