search

pazi88 / STM32_CAN

CAN bus Library for Arduino STM32
GNU General Public License v3.0
62 stars 24 forks source link

Support for PB8/PA12 CAN pin mapping on STM32F042 #36

Open sshsphere opened 2 months ago

sshsphere commented 2 months ago

It would be nice if this library natively supported use of PB8 (CAN RX) and PA12 (CAN TX) for the CAN interface.

This code generated from CubeIDE might be helpful:

__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_CAN;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_CAN;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

I added this option to the begin function in STM32_CAN.cpp and everything works perfectly

pazi88 commented 2 months ago

Ok. Good to know that it works. I'll see what I can do. Some use different way of setting up the pins that are used and in those you can only use the pin pairs that are currently available in the library. I need to think best way to do that.