Arm 让bxCan处理STM32f3发现
我正在努力让stm32f3发现上的bxcan正常工作。我创建了一个简单的程序,通过bxcan发送信息,并在实验室用osci检查针脚PA11和PA12,在家用万用表检查针脚PA11和PA12。到目前为止,osci和万用表显示未传输信号-tx和rx引脚均堆叠在0V。代码如下:Arm 让bxCan处理STM32f3发现,arm,stm32,can-bus,Arm,Stm32,Can Bus,我正在努力让stm32f3发现上的bxcan正常工作。我创建了一个简单的程序,通过bxcan发送信息,并在实验室用osci检查针脚PA11和PA12,在家用万用表检查针脚PA11和PA12。到目前为止,osci和万用表显示未传输信号-tx和rx引脚均堆叠在0V。代码如下: #define CANx CAN1 #define CAN_CLK RCC_APB1Periph_CAN1 #define CAN_RX_PIN
#define CANx CAN1
#define CAN_CLK RCC_APB1Periph_CAN1
#define CAN_RX_PIN GPIO_Pin_11
#define CAN_TX_PIN GPIO_Pin_12
#define CAN_GPIO_PORT GPIOA
#define CAN_GPIO_CLK RCC_AHBPeriph_GPIOA
#define CAN_AF_PORT GPIO_AF_9
#define CAN_RX_SOURCE GPIO_PinSource11
#define CAN_TX_SOURCE GPIO_PinSource12
int main(void)
{
CAN_Config();
while(1)
{
TxMessage.Data[0] = KeyNumber;
CAN_Transmit(CANx, &TxMessage);
Delay();
}
}
/**
* @brief Configures the CAN.
* @param None
* @retval None
*/
static void CAN_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* CAN GPIOs configuration **************************************************/
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(CAN_GPIO_CLK, ENABLE);
/* Connect CAN pins to AF9 */
GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_RX_SOURCE, CAN_AF_PORT);
GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_TX_SOURCE, CAN_AF_PORT);
/* 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_UP;
GPIO_Init(CAN_GPIO_PORT, &GPIO_InitStructure);
/* NVIC configuration *******************************************************/
NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//TODO:Enable NVIC_Init(&NVIC_InitStructure);
/* CAN configuration ********************************************************/
/* Enable CAN clock */
RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);
/* CAN register init */
CAN_DeInit(CANx);
CAN_StructInit(&CAN_InitStructure);
/* 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;
/* CAN Baudrate = 1MBps (CAN clocked at 36 MHz) */
CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
CAN_InitStructure.CAN_Prescaler = 2;
CAN_Init(CANx, &CAN_InitStructure);
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber = 0;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
/* Transmit Structure preparation */
TxMessage.StdId = 0x321;
TxMessage.ExtId = 0x01;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = 1;
/* Enable FIFO 0 message pending Interrupt */
CAN_ITConfig(CANx, CAN_IT_FMP0, ENABLE);
}
到目前为止,我可以声明代码编译时没有警告和错误,并且调试器显示相应总线的激活时钟。我检查了std用户手册,根据它bxcan配置是正确的。不知怎么的,它不起作用了。。。(我没有CAN方面的经验)。在花了一段时间到处寻找解决方案后,我终于发现在STM32F3的数据表中,发现写了开关sb21和sb22应该连接(焊接)以将它们连接到CAN。这样做就成功了。感谢您发布解决方案。