prosím Vás nevšiml by si někdo nějaké chyby? Oba konce sběrnice jsou zakončeny rezistory 120R a propojeny cca 0,5m krouceného kabliku. Pro ladění používám toto https://imfsoft.com/kategorie-can-bus/u ... high-speed s tím, že v obslužném SW se načítají pouze chyby, ale žádná data nedorazí.
Kód: Vybrať všetko
void CAN_Configuration()
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
// Povoleni hodin GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
// Povoleni hodin CAN
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);
// Nastaveni CAN ramce
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = DISABLE;//ENABLE;//
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;//ENABLE;//
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
// 500 kbps
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_12tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
//CAN_InitStructure.CAN_Prescaler=1; // 2000 kbit/s
//CAN_InitStructure.CAN_Prescaler=2; // 1000 kbit/s
//CAN_InitStructure.CAN_Prescaler=4; // 500 kbit/s
//CAN_InitStructure.CAN_Prescaler=5; // 400 kbit/s
//CAN_InitStructure.CAN_Prescaler=8; // 250 kbit/s
//CAN_InitStructure.CAN_Prescaler=10; // 200 kbit/s
//CAN_InitStructure.CAN_Prescaler=16; // 125 kbit/s
//CAN_InitStructure.CAN_Prescaler=20; // 100 kbit/s
//CAN_InitStructure.CAN_Prescaler=40; // 50 kbit/s
//CAN_InitStructure.CAN_Prescaler=80; // 40 kbit/s
CAN_InitStructure.CAN_Prescaler=200; // 10 kbit/s
CAN_Init(CAN1, &CAN_InitStructure);
// Nastaveni filtru zprav CAN
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 = CAN_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
/* 2 bit for pre-emption priority, 2 bits for subpriority */
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);
// Configure CAN pin: RX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Configure CAN pin: TX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//GPIO_PinRemapConfig(GPIO_Remap2_CAN1 , ENABLE);
// prenos
CanTxMsg TxMessage;
TxMessage.StdId = 0x321;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.ExtId = 0x01;
TxMessage.DLC = 8;
}
Kód: Vybrať všetko
void CAN_send()
{
CanTxMsg TxMessage;
/*TxMessage.StdId = 0x00;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.ExtId = 0x00;*/
TxMessage.Data[0] = 0x04;
TxMessage.Data[1] = 0x01;
TxMessage.Data[2] = 0x00;
TxMessage.Data[3] = 0x00;
TxMessage.Data[4] = 0x00;
TxMessage.Data[5] = 0x00;
TxMessage.Data[6] = 0x00;
TxMessage.Data[7] = 0x00;
//TxMessage.DLC = 8;
CAN_Transmit(CAN1, &TxMessage);
}
