本帖最后由 想把我唱给你听 于 2014-10-22 11:12 编辑
我现在做一个汽车CAN总线通信，在f103（使用V3.5库）上跑得很完美，一搬到f042（使用V1.3.1库）上就是死活初始化不成功：
代码如下：
void CAN_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(CAN_GPIO_CLK, ENABLE);
/* Enable CAN clock */
RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);
/* CAN register init */
CAN_DeInit(CAN);
GPIO_DeInit(GPIOA);
/* Configure CAN RX and TX pins */
GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
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(CAN_GPIO_PORT, &GPIO_InitStructure);
/* Connect CAN pins to AF4 */
GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_RX_SOURCE, CAN_AF_PORT);
GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_TX_SOURCE, CAN_AF_PORT);
/* CAN filter init */
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 = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
CAN_StructInit(&CAN_InitStructure);
/* CAN cell init */
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = ENABLE;
CAN_InitStructure.CAN_AWUM = ENABLE;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
/* CAN Baudrate = 500KBps (CAN clocked at 48 MHz) */
CAN_InitStructure.CAN_SJW = CAN_SJW_2tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_7tq;
CAN_InitStructure.CAN_Prescaler = 6;
CAN_Init(CAN, &CAN_InitStructure); //代码就死在这个函数里面的等待硬件应答的地方，附在下方
/* NVIC configuration ****/
NVIC_InitStructure.NVIC_IRQChannel = CEC_CAN_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable FIFO 0 message pending Interrupt */
CAN_ITConfig(CAN, CAN_IT_FMP0, ENABLE);
}
代码就死在这个初始化的函数里面，我是通过在线调试发现问题出在这的。。。。。。
uint8_t CAN_Init(CAN_TypeDef* CANx, CAN_InitTypeDef* CAN_InitStruct)
{
uint8_t InitStatus = CAN_InitStatus_Failed;
uint32_t wait_ack = 0x00000000;
/* Check the parameters */
assert_param(IS_CAN_ALL_PERIPH(CANx));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_TTCM));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_ABOM));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_AWUM));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_NART));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_RFLM));
assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_TXFP));
assert_param(IS_CAN_MODE(CAN_InitStruct->CAN_Mode));
assert_param(IS_CAN_SJW(CAN_InitStruct->CAN_SJW));
assert_param(IS_CAN_BS1(CAN_InitStruct->CAN_BS1));
assert_param(IS_CAN_BS2(CAN_InitStruct->CAN_BS2));
assert_param(IS_CAN_PRESCALER(CAN_InitStruct->CAN_Prescaler));
/* Exit from sleep mode */
CANx->MCR &= (~(uint32_t)CAN_MCR_SLEEP);
/* Request initialisation */
CANx->MCR |= CAN_MCR_INRQ ;
/* Wait the acknowledge */
while (((CANx->MSR & CAN_MSR_INAK) != CAN_MSR_INAK) && (wait_ack != INAK_TIMEOUT)) //硬件在这里应答的好好的，说明可进入初始化模式
{
wait_ack++;
}
/* Check acknowledge */
if ((CANx->MSR & CAN_MSR_INAK) != CAN_MSR_INAK)
{
InitStatus = CAN_InitStatus_Failed;
}
else
{
/* Set the time triggered communication mode */
if (CAN_InitStruct->CAN_TTCM == ENABLE)
{
CANx->MCR |= CAN_MCR_TTCM;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_TTCM;
}
/* Set the automatic bus-off management */
if (CAN_InitStruct->CAN_ABOM == ENABLE)
{
CANx->MCR |= CAN_MCR_ABOM;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_ABOM;
}
/* Set the automatic wake-up mode */
if (CAN_InitStruct->CAN_AWUM == ENABLE)
{
CANx->MCR |= CAN_MCR_AWUM;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_AWUM;
}
/* Set the no automatic retransmission */
if (CAN_InitStruct->CAN_NART == ENABLE)
{
CANx->MCR |= CAN_MCR_NART;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_NART;
}
/* Set the receive FIFO locked mode */
if (CAN_InitStruct->CAN_RFLM == ENABLE)
{
CANx->MCR |= CAN_MCR_RFLM;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_RFLM;
}
/* Set the transmit FIFO priority */
if (CAN_InitStruct->CAN_TXFP == ENABLE)
{
CANx->MCR |= CAN_MCR_TXFP;
}
else
{
CANx->MCR &= ~(uint32_t)CAN_MCR_TXFP;
}
/* Set the bit timing register */
CANx->BTR = (uint32_t)((uint32_t)CAN_InitStruct->CAN_Mode << 30) | \
((uint32_t)CAN_InitStruct->CAN_SJW << 24) | \
((uint32_t)CAN_InitStruct->CAN_BS1 << 16) | \
((uint32_t)CAN_InitStruct->CAN_BS2 << 20) | \
((uint32_t)CAN_InitStruct->CAN_Prescaler - 1);
/* Request leave initialisation */
CANx->MCR &= ~(uint32_t)CAN_MCR_INRQ;
/* Wait the acknowledge */
wait_ack = 0;
while (((CANx->MSR & CAN_MSR_INAK) == (uint16_t)CAN_MSR_INAK) && (wait_ack != INAK_TIMEOUT)) //硬件在这里无应答呢，初始化失败，这咋回事
{
wait_ack++; 我已经整了第三天了，求各位有经验的大哥大
} 大神们教教小弟吧:hug:
/* ...and check acknowledged */
if ((CANx->MSR & CAN_MSR_INAK) == CAN_MSR_INAK)
{
InitStatus = CAN_InitStatus_Failed;
}
else
{
InitStatus = CAN_InitStatus_Success ;
}
}
/* At this step, return the status of initialization */
return InitStatus;
}
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