Posted on December 15, 2014 at 17:13
Hello! I use STM32F407 Discovery board and want to use CAN1. My IDE is CoocoxIDE.
I've putoscilloscopeon line PD1 (CAN TX) and haven't seen any activity...Discovery CAN works without any CAN IC (CAN Driver). Here is my code:
const
uint8_t TxBuffer[8] = {1,2,3,4,5,6,7,8};
int
main(
void
)
{
CAN1_Initialization();
while
(1)
{
CAN1_DataSend(TxBuffer);
_delay_ms(50);
}
}
and CAN code:
CanTxMsg TxMessage;
void
CAN1_Initialization(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
//NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIO clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
/* Configure CAN 1 RX and TX pins */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* Connect CAN 1 pins to AF9 */
GPIO_PinAFConfig(GPIOD, GPIO_PinSource0, GPIO_AF_CAN1);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_CAN1);
//CAN_DeInit(CAN1);
/* CAN 1 cell init */
CAN_InitStructure.CAN_Prescaler = 12;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_3tq;
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_Init( CAN1, &CAN_InitStructure );
/* CAN1 filter init, accept every message */
CAN_FilterInitStructure.CAN_FilterNumber = 0;
// 0..13 for CAN1, .27 for CAN2
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 = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
/* Message Init */
TxMessage.StdId = 0x123;
TxMessage.ExtId = 0;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = 1;
TxMessage.Data[0] = 5;
}
void
CAN1_DataSend(
const
uint8_t* txBuff )
{
TxMessage.StdId = 0x123;
TxMessage.ExtId = 0;
//TxMessage.RTR = CAN_RTR_DATA;
//TxMessage.IDE = CAN_ID_STD;
//TxMessage.DLC = 1;
TxMessage.Data[0] = 0;
TxMessage.Data[1] = 1;
TxMessage.Data[2] = 2;
TxMessage.Data[3] = 3;
TxMessage.Data[4] = 4;
TxMessage.Data[5] = 5;
TxMessage.Data[6] = 6;
TxMessage.Data[7] = 7;
/*
for (uint8_t i = 0; i < 8; i++)
{
TxMessage.Data[i] = txBuff[i];
}
*/
CAN_Transmit(CAN1, &TxMessage);
}
How come I can send datathrough CAN1?
