Can Bus, sending and receiving does not work

[csminus]

Posted on June 15, 2015 at 21:25

ghhhhhhhhhhhhk

#lmgtfy #can-bus #stm32f207 #can-prescale-and-quanta

[csminus]

Posted on June 17, 2015 at 14:20

fghfhgdhfhdhfh

[Tesla DeLorean]

Posted on June 17, 2015 at 17:21

Like I said, I've posted complete examples

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

GPIO_PinAFConfig(GPIOD, GPIO_PinSource11, GPIO_AF_CAN1);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_CAN1);

Not GPIOD

[csminus]

Posted on June 18, 2015 at 11:31sory i changed to GPIOA but still not working, could you give me a link to sime of your post with some stm32f2 example

[jpeacock]

Posted on June 18, 2015 at 14:21

I'm not sure how you got the BS1, BS2 and prescale figures.  For an STM32F2 the PCLK1 clock is 120MHz/4 or 30MHz (APB1).  For CAN time quanta I use

CAN_SJW_1tq CAN_BS1_6tq CAN_BS2_8tq For a 250Kbit/sec data rate I calculate the prescaler as: clock = 120000000 / (1 + 6 + 8) = 8000000  (CAN clock ticks, sum of quanta) prescale = clock / rate = 8000000 / 250000 = 32 Also, for now enable the ABOM and NART flags for automatic bus management and retries. Your prescale works out to about 3.3MHz, much too fast for the CAN bus.   Jack Peacock

[csminus]

Posted on June 18, 2015 at 15:04ok i set prescaler to 64 and i enable ABOM and NART, i have something in CAN, ESR not 0 like before. But still dont work eh

[Tesla DeLorean]

Posted on June 18, 2015 at 15:20

Using Google to find my own posts

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Can-Bus%20Error&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=581

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/CAN%20not%20working%20on%20STM32F205%20%28proto%20board%29&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506...

[csminus]

Posted on June 18, 2015 at 15:33

I made all like in stm32f4, becouse and still not works, when i back home i will show all code

[csminus]

Posted on June 18, 2015 at 15:36

kljlkjljkklj

[jpeacock]

Posted on June 18, 2015 at 19:44

[jpeacock]

Posted on June 18, 2015 at 19:48

Are both nodes configured the same way, and is the ESR the same for both nodes?

Have you checked the CAN transceivers on both sides to make sure a signal is present?

  Jack Peacock