中铁建设集团门户网登录网站,专门卖医疗器械的网站,2020给个免费网站好人有好报,湖北葛洲坝建设工程网站1.keil的奇怪问题
创建的数组分配内存到0x10000000地址的时候#xff0c;数据总是莫名其妙的出现问题#xff0c;取消勾选就正常了 stm32f407内部有一个CCM内存#xff0c;这部分内存只能由内核控制#xff0c;任何外设都不能够进行访问。这样问题就来了#xff0c;如果使…1.keil的奇怪问题
创建的数组分配内存到0x10000000地址的时候数据总是莫名其妙的出现问题取消勾选就正常了 stm32f407内部有一个CCM内存这部分内存只能由内核控制任何外设都不能够进行访问。这样问题就来了如果使用keil5进行编程时勾选了这个选项下图则编译的时候会随机将数据放到CCM中。而Lwip通讯靠的是以太网的专用DMA如果在编译的时候lwip的描述符被分配到CCM中那就会导致ping不同的现象。
2.STM32的CAN ID滤波器的设置
列表模式和掩码模式的两个设置以及多滤波器的设置方法
static void CanBSP_STM32_Can1_CfgFilter()
{CAN_FilterTypeDef sFilterConfig;CAN_FilterTypeDef sFilterConfig1;sFilterConfig.FilterBank 0; //过滤器0sFilterConfig.FilterMode CAN_FILTERMODE_IDLIST; //设为列表模式 sFilterConfig.FilterScale CAN_FILTERSCALE_16BIT; sFilterConfig.FilterIdHigh ((uint32_t)0x181)5; //基本ID放入到STID中 sFilterConfig.FilterIdLow ((uint32_t)0x182) 5; sFilterConfig.FilterMaskIdHigh ((uint32_t)0x183)5;sFilterConfig.FilterMaskIdLow ((uint32_t)0x184)5; //接收到的报文放入到FIFO0中 sFilterConfig.FilterFIFOAssignment CAN1FIFO; sFilterConfig.FilterActivation ENABLE; //激活过滤器sFilterConfig1 sFilterConfig;sFilterConfig1.FilterBank 1;sFilterConfig1.FilterIdHigh ((uint32_t)0x185)5; //基本ID放入到STID中 sFilterConfig1.FilterIdLow ((uint32_t)0x186) 5; sFilterConfig1.FilterMaskIdHigh ((uint32_t)0x187)5;sFilterConfig1.FilterMaskIdLow ((uint32_t)0x188)5; if (HAL_CAN_ConfigFilter(hcan1, sFilterConfig) ! HAL_OK){/* Filter configuration Error */Error_Handler();}if (HAL_CAN_ConfigFilter(hcan1, sFilterConfig1) ! HAL_OK){/* Filter configuration Error */Error_Handler();}/* Start the CAN peripheral */if (HAL_CAN_Start(hcan1) ! HAL_OK){/* Start Error */Error_Handler();}/* Activate CAN RX notification */if (HAL_CAN_ActivateNotification(hcan1, CAN_IT_RX_FIFO0_MSG_PENDING) ! HAL_OK){/* Notification Error å¼€å¯æŒ‚èµ·ä¸æ®µå…许失败*/Error_Handler();}
}static void CanBSP_STM32_Can2_CfgFilter()
{CAN_FilterTypeDef sFilterConfig;CAN_FilterTypeDef sFilterConfig1;sFilterConfig.FilterBank 14;sFilterConfig.FilterMode CAN_FILTERMODE_IDMASK; /* 工作在标识符屏蔽位模式 */sFilterConfig.FilterScale CAN_FILTERSCALE_32BIT; /* 过滤器位宽为单个32位。*/sFilterConfig.FilterIdHigh (((uint32_t)0x60021)0xFFFF0000) 16; sFilterConfig.FilterIdLow (((uint32_t)0x600 21)|CAN_ID_STD|CAN_RTR_DATA)0XFFFF;sFilterConfig.FilterMaskIdHigh (((uint32_t)0x60021)0xFFFF0000) 16;sFilterConfig.FilterMaskIdLow 0x0000;sFilterConfig.FilterFIFOAssignment CAN_RX_FIFO1; /* 过滤器被关联到FIFO 1 */sFilterConfig.FilterActivation ENABLE; /* 使能过滤器 */ sFilterConfig1 sFilterConfig;sFilterConfig1.FilterBank 15;sFilterConfig1.FilterIdHigh (((uint32_t)0x50021)0xFFFF0000) 16; sFilterConfig1.FilterIdLow (((uint32_t)0x500 21)|CAN_ID_STD|CAN_RTR_DATA)0XFFFF;sFilterConfig1.FilterMaskIdHigh (((uint32_t)0x50021)0xFFFF0000) 16;sFilterConfig1.FilterMaskIdLow 0x0000;if (HAL_CAN_ConfigFilter(hcan2, sFilterConfig) ! HAL_OK){/* Filter configuration Error */Error_Handler();}if (HAL_CAN_ConfigFilter(hcan2, sFilterConfig1) ! HAL_OK){/* Filter configuration Error */Error_Handler();}/* Start the CAN peripheral */if (HAL_CAN_Start(hcan2) ! HAL_OK){/* Start Error */Error_Handler();}/* Activate CAN RX notification */if (HAL_CAN_ActivateNotification(hcan2, CAN_IT_RX_FIFO1_MSG_PENDING) ! HAL_OK){/* Notification Error å¼€å¯æŒ‚èµ·ä¸æ®µå…许失败*/Error_Handler();}}
