Posted on March 09, 2016 at 11:55Hi,
I have successfully configure CAN2 in STM32F429ZI discovery board. But when I am trying to transmit message it goes to transmit pending state. I have configure the baudrate of 500k at PCLK1 frequency 45MHz. I also share my code below. Please anyone help me to find problem.
static void CAN_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructureCAN_RX;
GPIO_InitTypeDef GPIO_InitStructureCAN_TX;
CAN_InitTypeDef CAN_InitStructure ;
/* Enable the GPIO Clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN2, ENABLE); //CAN2 Peripharal clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_PinAFConfig(CAN2_Port, GPIO_PinSource12, GPIO_AF_CAN2); //CAN_RX = PB12
GPIO_PinAFConfig(CAN2_Port, GPIO_PinSource13, GPIO_AF_CAN2); //CAN_TX = PB13
/* Configure the GPIO_CAN_Rx pin */
GPIO_InitStructureCAN_RX.GPIO_Pin = CAN2_Rx;
GPIO_InitStructureCAN_RX.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructureCAN_TX.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructureCAN_TX.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructureCAN_RX.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(CAN2_Port, &GPIO_InitStructureCAN_RX);
/* GPIO CAN_TX Configuration */
GPIO_InitStructureCAN_TX.GPIO_Pin = CAN2_Tx;
GPIO_InitStructureCAN_TX.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructureCAN_TX.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructureCAN_TX.GPIO_PuPd = GPIO_PuPd_NOPULL;
//GPIO_InitStructureCAN_TX.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructureCAN_TX.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(CAN2_Port, &GPIO_InitStructureCAN_TX);
CAN_DeInit(CAN2);
//CAN_FilterConfiguration();
/* CAN2 configuration */
CAN_InitStructure.CAN_TTCM = DISABLE; // Time-triggered communication mode = DISABLED
CAN_InitStructure.CAN_ABOM = DISABLE; // Automatic bus-off management mode = DISABLED
CAN_InitStructure.CAN_AWUM = DISABLE; // Automatic wake-up mode = DISABLED
CAN_InitStructure.CAN_NART = DISABLE; // Non-automatic retransmission mode = DISABLED
CAN_InitStructure.CAN_RFLM = DISABLE; // Receive FIFO locked mode = DISABLED
CAN_InitStructure.CAN_TXFP = DISABLE; // Transmit FIFO priority = DISABLED
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal; // Normal CAN mode
//CAN_InitStructure.CAN_Mode = CAN_Mode_Silent;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq; // Synchronization jump width = 1
CAN_InitStructure.CAN_BS1 = CAN_BS1_13tq; //14
CAN_InitStructure.CAN_BS2 = CAN_BS2_4tq; //6
CAN_InitStructure.CAN_Prescaler = 5; // Baudrate 500 kbps
//CAN_InitStructure.CAN_Prescaler = 16; // Baudrate 125 kbps
//x=CAN_Init( CAN2, &CAN_InitStructure);
if(CAN_Init( CAN2, &CAN_InitStructure))
{
/* Initialize LEDs mounted on EVAL board */
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDOn(LED3);
}
if(!CAN_Init( CAN2, &CAN_InitStructure))while(1);
}
static void CAN_FilterConfiguration(void) {
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* CAN2 filter configuration */
CAN_FilterInitStructure.CAN_FilterNumber = 0; // Filter number = 0 (0<=x<=13)
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask; // Filter mode = identifier mask based filtering
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_16bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0300 << 5; //0x0000;
CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x03FF << 5;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FIFO0; // FIFO = 0
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
}
static void CAN_TxMessage(void) {
CanTxMsg TxMessage;
/* CAN message to send */
TxMessage.StdId = 0x321;
TxMessage.ExtId = 0x01;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = 8;
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;
//while (1) {
CAN_Transmit(CAN2, &TxMessage);
//CAN_TransmitStatus(CAN2, 0);
if(CAN_TransmitStatus(CAN2, 0) == CAN_TxStatus_Ok )
{
STM_EVAL_LEDInit(LED4); // Initialize and
STM_EVAL_LEDOn(LED4); // turn ON green LED if transmit was successful
}
//}
}
