Posted on October 17, 2014 at 11:21
I have a CAN bus project that needs to use bothCAN1_RX0_IRQn and CAN1_SCE_IRQn. But it happened is that when I enabledboth of the interrupts, then the interrupts did not work at all. Here is my CanConfig():
#define CAN1_CLK RCC_APB1Periph_CAN1
#define CAN1_RX_PIN GPIO_Pin_0
#define CAN1_TX_PIN GPIO_Pin_1
#define CAN1_GPIO_PORT GPIOD
#define CAN1_GPIO_CLK RCC_AHB1Periph_GPIOD
#define CAN1_AF_PORT GPIO_AF_CAN1
#define CAN1_RX_SOURCE GPIO_PinSource0
#define CAN1_TX_SOURCE GPIO_PinSource1
uint8_t CANConfig1(
void
) {
/* CAN1 Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
/* CAN GPIOs configuration **************************************************/
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
/* Configure CAN RX and TX pins */
GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, CAN_RX_SOURCE, GPIO_AF_CAN1);
GPIO_PinAFConfig(GPIOD, CAN_TX_SOURCE, GPIO_AF_CAN1);
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* CAN register init */
CAN_DeInit(CAN1);
/* CAN cell init */
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
/* Baudrate = 250 Kbps */
CAN_InitStructure.CAN_BS1 = CAN_BS1_14tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_6tq;
CAN_InitStructure.CAN_Prescaler = 8;
CAN_Init(CAN1, &CAN_InitStructure);
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber = 1;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_16bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x000 << 5;
CAN_FilterInitStructure.CAN_FilterIdLow = 0x000 << 5;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x000 << 5;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x000 << 5;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
/* Enable CAN1 RX0 interrupt IRQ channel */
// NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn| CAN1_SCE_IRQn; //not working
NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
// working
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* CAN FIFO0 message pending interrupt enable */
CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
CAN_ITConfig(CAN1, CAN_IT_BOF | CAN_IT_EPV | CAN_IT_EWG | CAN_IT_ERR,
ENABLE);
return
0;
}
My interrupt routines, I just leave them empty, like this:
void CAN1_SCE_IRQHandler(void) {
}
I tested my method of sending which is correct but receiving method has the problem as stated above. My board is stm32f4 discovery. Can you help me to see what i do wrong :(
