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GD32 CAN1和TIMER0同时开启问题

news 2025/7/13 10:56:48

背景：今天在一个项目调试的时候发现了一些问题，由此贴记录一下问题解决的过程。

使用的芯片是GD32F305VE。使用到了CAN1和TIMER0。在使用这连个外设的时候发送了一些问题。

单独使用CAN1。功能正常。

单独使用TIMER0。配置为输出模式。功能正常。

但是当两个功能同时使用，初始化的时候，就出问题了。

1、引脚配置

//TIMER0 引脚定义
#define   TIMER0_CH2_GPIO_PIN              GPIO_PIN_10
#define   TIMER0_CH1_GPIO_PIN              GPIO_PIN_9
#define   TIMER0_CH2N_GPIO_PIN             GPIO_PIN_15
#define   TIMER0_CH1N_GPIO_PIN             GPIO_PIN_14

//CAN1引脚定义
#define   CAN1_CLOCK                    RCU_GPIOB
#define   CAN1_GPIO                     GPIOB
#define   CAN1_TX_GPIO_PIN              GPIO_PIN_13
#define   CAN1_RX_GPIO_PIN              GPIO_PIN_12

从引脚上看，每个是没有用到重复的引脚的。都是单独分开。

2、发现问题

但是这时候，会导致一个问题。

CAN1的初始化失败了。

//这是底层的库函数，CAN初始化
ErrStatus can_init(uint32_t can_periph, can_parameter_struct* can_parameter_init)
{uint32_t timeout = CAN_TIMEOUT;ErrStatus flag = ERROR;/* disable sleep mode */CAN_CTL(can_periph) &= ~CAN_CTL_SLPWMOD;/* enable initialize mode */CAN_CTL(can_periph) |= CAN_CTL_IWMOD;/* wait ACK */while((CAN_STAT_IWS != (CAN_STAT(can_periph) & CAN_STAT_IWS)) && (0U != timeout)){timeout--;}/* check initialize working success */if(CAN_STAT_IWS != (CAN_STAT(can_periph) & CAN_STAT_IWS)){flag = ERROR;}else{/* set the bit timing register */CAN_BT(can_periph) = (BT_MODE((uint32_t)can_parameter_init->working_mode) | \BT_SJW((uint32_t)can_parameter_init->resync_jump_width) | \BT_BS1((uint32_t)can_parameter_init->time_segment_1) | \BT_BS2((uint32_t)can_parameter_init->time_segment_2) | \BT_BAUDPSC(((uint32_t)(can_parameter_init->prescaler) - 1U)));/* time trigger communication mode */if(ENABLE == can_parameter_init->time_triggered){CAN_CTL(can_periph) |= CAN_CTL_TTC;}else{CAN_CTL(can_periph) &= ~CAN_CTL_TTC;}/* automatic bus-off managment */if(ENABLE == can_parameter_init->auto_bus_off_recovery){CAN_CTL(can_periph) |= CAN_CTL_ABOR;}else{CAN_CTL(can_periph) &= ~CAN_CTL_ABOR;}/* automatic wakeup mode */if(ENABLE == can_parameter_init->auto_wake_up){CAN_CTL(can_periph) |= CAN_CTL_AWU;}else{CAN_CTL(can_periph) &= ~CAN_CTL_AWU;}/* automatic retransmission mode disable */if(ENABLE == can_parameter_init->no_auto_retrans){CAN_CTL(can_periph) |= CAN_CTL_ARD;}else{CAN_CTL(can_periph) &= ~CAN_CTL_ARD;}/* receive fifo overwrite mode */        if(ENABLE == can_parameter_init->rec_fifo_overwrite){CAN_CTL(can_periph) |= CAN_CTL_RFOD;}else{CAN_CTL(can_periph) &= ~CAN_CTL_RFOD;} /* transmit fifo order */if(ENABLE == can_parameter_init->trans_fifo_order){CAN_CTL(can_periph) |= CAN_CTL_TFO;}else{CAN_CTL(can_periph) &= ~CAN_CTL_TFO;}  /* disable initialize mode */CAN_CTL(can_periph) &= ~CAN_CTL_IWMOD;timeout = CAN_TIMEOUT;/* wait the ACK */while((CAN_STAT_IWS == (CAN_STAT(can_periph) & CAN_STAT_IWS)) && (0U != timeout)){timeout--;}/* check exit initialize mode */if(0U != timeout){flag = SUCCESS;}}  return flag;
}

进入这个函数后，会进入使能初始化工作工作模式。这个查看用户手册可以查到。