用固件库函数方式写个Stm32f103c8t6 写个程序PA4外部上拉，外部8M晶体，PA11为CAN RX,PA12为CAN TX ,当CAN 接收到数据00 00 00 01 00 00 00 00时PA4输出低电平，波特率为500K，帧ID为0XB4

好的，我了解了你的要求。下面是代码，你可以参考一下：

#include "stm32f10x.h"
#include "stm32f10x_can.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"

#define CAN_RX_PIN	GPIO_Pin_11
#define CAN_TX_PIN	GPIO_Pin_12

void GPIO_Configuration(void);
void CAN_Configuration(void);
void NVIC_Configuration(void);

int main(void)
{
  GPIO_Configuration();
  CAN_Configuration();
  NVIC_Configuration();

  while (1)
  {
  }
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  // PA4
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  // PA11,PA12
  GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void CAN_Configuration(void)
{
  CAN_InitTypeDef CAN_InitStructure;
  CAN_FilterInitTypeDef CAN_FilterInitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

  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_InitStructure.CAN_BS1 = CAN_BS1_9tq;
  CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
  CAN_InitStructure.CAN_Prescaler = 4;
  CAN_Init(CAN1, &CAN_InitStructure);

  CAN_FilterInitStructure.CAN_FilterNumber = 0;
  CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
  CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
  CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000B400;
  CAN_FilterInitStructure.CAN_FilterIdLow = 0x00000000;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000FFFF;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000FFFF;
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
  CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

  CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
}

void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void USB_LP_CAN1_RX0_IRQHandler(void)
{
  CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);

  if (RxMessage.StdId == 0xB4 && RxMessage.Data[0] == 0x00 && RxMessage.Data[1] == 0x00 && RxMessage.Data[2] == 0x00 && RxMessage.Data[3] == 0x01 && RxMessage.Data[4] == 0x00 && RxMessage.Data[5] == 0x00 && RxMessage.Data[6] == 0x00 && RxMessage.Data[7] == 0x00)
  {
    GPIO_ResetBits(GPIOA, GPIO_Pin_4);
  }
}

在这个程序中，我们首先进行了 GPIO 和 CAN 的初始化配置，然后在主循环中一直等待接收到 CAN 信息。当接收到 CAN 信息时，我们会检查其帧 ID 和数据是否满足要求，如果满足，就将 PA4 输出低电平。

这个程序的波特率为 500K，帧 ID 为 0xB4，数据为 00 00 00 01 00 00 00 00。你可以根据需要自行修改这些参数。