Posted on April 11, 2013 at 16:03 Hi,
I have a problem with the CAN keil example for mcbstm32 board.
I use this example a lot with the remap for CAN so the pins are PB8 and PB9. That is theDefault configuration for the board.
I tried to change the pins to original position with no remap (PA11 and PA12) to test the program with another board.
So I go to CAN_STM32Fc and change the function to:
/* 1. Enable CAN controller Clock */
RCC->APB1ENR |= (1 <<
25
);
/* Note: MCBSTM32 uses PB8 and PB9 for CAN */
/* 2. Setup CAN Tx and Rx pins */
// RCC->APB2ENR |= (1 <<
0
); // enable clock for Alternate Function
// AFIO->MAPR &= 0xFFFF9FFF; // reset CAN remap
// AFIO->MAPR |= 0x00004000; // set CAN remap, use PB8, PB9
/* GPIOB clock enable */
// RCC->APB2ENR |= (1 <<
3
);
/* Configure CAN pin: RX PB.8 input push pull */
// GPIOB->CRH &= ~(0x0F<<
0
);
// GPIOB->CRH |= (0x08<<
0
);
/* Configure CAN pin: TX PB.9 alternate output push pull */
// GPIOB->CRH &= ~(0x0F<<
4
);
// GPIOB->CRH |= (0x0B<<
4
);
/* 2. Setup CAN Tx and Rx pins */
/* GPIOA clock enable */
RCC->APB2ENR |= (1 <<
2
);
/* Configure CAN pin: RX PA.11 input push pull */
GPIOA->CRH &= ~(0x0F<<
12
);
GPIOA->CRH |= (0x08<<
12
);
/* Configure CAN pin: TX PA.12 alternate output push pull */
GPIOA->CRH &= ~(0x0F<<
16
);
GPIOA->CRH |= (0x0B<<
16
);
/* 3. Setup IRQ vector for CAN interrupt */
/* not necessary */
/* 4. Enable CAN interrupt */
NVIC->IPR [4] |= 0x10000000; /* set priority lower than SVC */
NVIC->ISER[0] |= (1 << (USB_HP_CAN_TX_IRQChannel & 0x1F));
/* only FIFO 0 is used */
NVIC->IPR [5] |= 0x00000010; /* set priority lower than SVC */
NVIC->ISER[0] |= (1 << (USB_LP_CAN_RX0_IRQChannel & 0x1F));
return CAN_OK;
It compile ok but after callingCAN_Start it stucks.
The example is: C:\Keil\ARM\Boards\Keil\MCBSTM32\RL\CAN
Any ideas?
Thanks
