STM8 can通讯 -

CAN通讯的速率，可以用示波器测试TX或RX，看最窄的波形，如果为16us，则为62500，如果为8us则是125000，我也搞不懂为什么STM8选内部时钟CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); 即16M

本文引用地址: http://www.21ic.com/app/mcu/201808/781915.htm

而CAN_Prescaler = 8;//8@125KHZ 16@62500HZ ，预分频选8时，是125KHZ，这是我量出的实际结果。

void CHECK_MAIL(void)//这个只是我调试中用于参考的，可以不检查直接发送

{

uchar i;

i=CAN_TransmitStatus(CAN_TxStatus_MailBox0Ok);

PRINTF("maiL0=%d ",&i);

i=CAN_TransmitStatus(CAN_TxStatus_MailBox1Ok);

PRINTF("maiL1=%d ",&i);

i=CAN_TransmitStatus(CAN_TxStatus_MailBox2Ok);

PRINTF("maiL2=%d rn",&i);

}

extern __IO uint8_t _Data[8];

extern char b_can_rxon;

void main(void)

{

uint16_t tx_count=0;

uint16_t re_tx=0;

CAN_TxStatus_TypeDef status = CAN_TxStatus_Failed;

CAN_Id_TypeDef Tx_IDE ;//CAN_Id_Standard; //= CAN_Id_Extended

CAN_RTR_TypeDef Tx_RTR = CAN_RTR_Data;

uint8_t Tx_DLC = 0;

uint8_t Tx_Data[8] = {0};

uint32_t Tx_Id = 0;

CLK_Config();

UART_CONFIG();

// GPIO_Config();

// LCD_Config();

CAN_Config();

enableInterrupts();

PRINTF("hello world!~rn",NULL);

GPIO_Init(GPIOC, GPIO_PIN_1,GPIO_MODE_OUT_PP_HIGH_FAST);

while(1)

{

#if 1

//PRINTF("hello world!~rn",NULL);

//Delay(1000);

tx_count++;

if(b_can_rxon)

{

GPIO_WriteReverse(GPIOC,GPIO_PIN_1);

PRINTF("RX:%drn",&_Data[0]);

b_can_rxon=0;

}

#else

Delay(500);

GPIO_WriteReverse(GPIOC,GPIO_PIN_1);

Tx_Id = 0x12345678;//29bit

Tx_IDE = CAN_Id_Extended;//CAN_Id_Standard;

Tx_RTR = CAN_RTR_Data;

Tx_DLC = 2;

Tx_Data[0] = tx_count++;

Tx_Data[1] = ~Tx_Data[0];

CHECK_MAIL();

status = CAN_Transmit(Tx_Id,Tx_IDE,Tx_RTR,Tx_DLC,Tx_Data);

if(status>0x10){PRINTF(" error:%drn",&status);continue;}//CAN_TxStatus_Ok

while(CAN_TransmitStatus(status)!=CAN_TxStatus_Ok)

{if(++re_tx==0)break;

}

if(re_tx==0)

{

if(status==CAN_TxStatus_MailBox0Ok) CAN_ClearFlag(CAN_FLAG_RQCP0);

if(status==CAN_TxStatus_MailBox1Ok) CAN_ClearFlag(CAN_FLAG_RQCP1);

if(status==CAN_TxStatus_MailBox2Ok) CAN_ClearFlag(CAN_FLAG_RQCP2);

PRINTF(" 强制CLEAR mail=%drn",&status);//CAN_TxStatus_Ok

}

else

{

PRINTF("tx:success mail=%drn",&status);//CAN_TxStatus_Ok

}

#endif

}

}

void CLK_Config(void)

{

CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);

}

void CAN_Config(void)

{

CAN_InitStatus_TypeDef status = CAN_InitStatus_Failed;

CAN_FilterNumber_TypeDef CAN_FilterNumber;

FunctionalState CAN_FilterActivation;

CAN_FilterMode_TypeDef CAN_FilterMode;

CAN_FilterScale_TypeDef CAN_FilterScale;

uint8_t CAN_FilterID1;

uint8_t CAN_FilterID2;

uint8_t CAN_FilterID3;

uint8_t CAN_FilterID4;

uint8_t CAN_FilterIDMask1;

uint8_t CAN_FilterIDMask2;

uint8_t CAN_FilterIDMask3;

uint8_t CAN_FilterIDMask4;

CAN_MasterCtrl_TypeDef CAN_MasterCtrl;

CAN_Mode_TypeDef CAN_Mode;

CAN_SynJumpWidth_TypeDef CAN_SynJumpWidth;

CAN_BitSeg1_TypeDef CAN_BitSeg1;

CAN_BitSeg2_TypeDef CAN_BitSeg2;

uint8_t CAN_Prescaler;

CAN_DeInit();

CAN_MasterCtrl=CAN_MasterCtrl_AllDisabled;

CAN_Mode = CAN_Mode_Normal;

CAN_SynJumpWidth = CAN_SynJumpWidth_1TimeQuantum;

CAN_BitSeg1 = CAN_BitSeg1_8TimeQuantum;

CAN_BitSeg2 = CAN_BitSeg2_7TimeQuantum;

CAN_Prescaler = 8;//8@125KHZ 16@62500HZ

status = CAN_Init(CAN_MasterCtrl, CAN_Mode, CAN_SynJumpWidth, CAN_BitSeg1,

CAN_BitSeg2, CAN_Prescaler);

CAN_FilterNumber = CAN_FilterNumber_0;

CAN_FilterActivation = ENABLE;

CAN_FilterMode = CAN_FilterMode_IdMask;

CAN_FilterScale = CAN_FilterScale_32Bit;

CAN_FilterID1=0x91;

CAN_FilterID2=0x00;

CAN_FilterID3=0x00;

CAN_FilterID4=0x00;

CAN_FilterIDMask1=0xff;

CAN_FilterIDMask2=0;

CAN_FilterIDMask3=0;

CAN_FilterIDMask4=0;

CAN_FilterInit(CAN_FilterNumber, CAN_FilterActivation, CAN_FilterMode,

CAN_FilterScale,CAN_FilterID1, CAN_FilterID2, CAN_FilterID3,

CAN_FilterID4,CAN_FilterIDMask1, CAN_FilterIDMask2,

CAN_FilterIDMask3, CAN_FilterIDMask4);

CAN_ITConfig(CAN_IT_FMP, ENABLE);

}