- /****************************************************************************
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V2.0
- * $Revision: 8 $
- * $Date: 15/01/16 1:45p $
- * @brief
- * Implement receive message in Normal mode.
- * This sample code needs to work with CAN_NormalMode_Transmit.
- * @note
- * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include "NUC131.h"
- #define PLL_CLOCK 48000000
- /*---------------------------------------------------------------------------*/
- /* Function Declare */
- /*---------------------------------------------------------------------------*/
- extern char GetChar(void);
- void CAN_ShowMsg(STR_CANMSG_T* Msg);
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define global variables and constants */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Declare a CAN message structure */
- STR_CANMSG_T rrMsg;
- /*---------------------------------------------------------------------------------------------------------*/
- /* ISR to handle CAN interrupt event */
- /*---------------------------------------------------------------------------------------------------------*/
- void CAN_MsgInterrupt(CAN_T *tCAN, uint32_t u32IIDR)
- {
- if(u32IIDR == 1)
- {
- //printf("Msg-0 INT and Callback\n");
- CAN_Receive(tCAN, 0, &rrMsg);
- CAN_ShowMsg(&rrMsg);
- }
- if(u32IIDR == 5 + 1)
- {
- //printf("Msg-5 INT and Callback \n");
- CAN_Receive(tCAN, 5, &rrMsg);
- CAN_ShowMsg(&rrMsg);
- }
- if(u32IIDR == 31 + 1)
- {
- //printf("Msg-31 INT and Callback \n");
- CAN_Receive(tCAN, 31, &rrMsg);
- CAN_ShowMsg(&rrMsg);
- }
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* CAN0 interrupt handler */
- /*---------------------------------------------------------------------------------------------------------*/
- void CAN0_IRQHandler(void)
- {
- uint32_t u8IIDRstatus;
- u8IIDRstatus = CAN0->IIDR;
- if(u8IIDRstatus == 0x00008000) /* Check Status Interrupt Flag (Error status Int and Status change Int) */
- {
- /**************************/
- /* Status Change interrupt*/
- /**************************/
- if(CAN0->STATUS & CAN_STATUS_RXOK_Msk)
- {
- CAN0->STATUS &= ~CAN_STATUS_RXOK_Msk; /* Clear RxOK status*/
- }
- if(CAN0->STATUS & CAN_STATUS_TXOK_Msk)
- {
- CAN0->STATUS &= ~CAN_STATUS_TXOK_Msk; /* Clear TxOK status*/
- }
- /**************************/
- /* Error Status interrupt */
- /**************************/
- if(CAN0->STATUS & CAN_STATUS_BOFF_Msk)
- {
- printf("BOFF INT\n") ;
- }
- else if(CAN0->STATUS & CAN_STATUS_EWARN_Msk)
- {
- printf("EWARN INT\n") ;
- }
- else if((CAN0->ERR & CAN_ERR_TEC_Msk) != 0)
- {
- printf("Transmit error!\n") ;
- }
- else if((CAN0->ERR & CAN_ERR_REC_Msk) != 0)
- {
- printf("Receive error!\n") ;
- }
- }
- else if((u8IIDRstatus >= 0x1) || (u8IIDRstatus <= 0x20))
- {
- CAN_MsgInterrupt(CAN0, u8IIDRstatus);
- CAN_CLR_INT_PENDING_BIT(CAN0, (u8IIDRstatus - 1)); /* Clear Interrupt Pending */
- }
- else if(CAN0->WU_STATUS == 1)
- {
- printf("Wake up\n");
- CAN0->WU_STATUS = 0; /* Write '0' to clear */
- }
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Reset message interface parameters */
- /*---------------------------------------------------------------------------------------------------------*/
- void CAN_ResetIF(CAN_T *tCAN, uint8_t u8IF_Num)
- {
- if(u8IF_Num > 1)
- return;
- tCAN->IF[u8IF_Num].CREQ = 0x0; // set bit15 for sending
- tCAN->IF[u8IF_Num].CMASK = 0x0;
- tCAN->IF[u8IF_Num].MASK1 = 0x0; // useless in basic mode
- tCAN->IF[u8IF_Num].MASK2 = 0x0; // useless in basic mode
- tCAN->IF[u8IF_Num].ARB1 = 0x0; // ID15~0
- tCAN->IF[u8IF_Num].ARB2 = 0x0; // MsgVal, eXt, xmt, ID28~16
- tCAN->IF[u8IF_Num].MCON = 0x0; // DLC
- tCAN->IF[u8IF_Num].DAT_A1 = 0x0; // data0,1
- tCAN->IF[u8IF_Num].DAT_A2 = 0x0; // data2,3
- tCAN->IF[u8IF_Num].DAT_B1 = 0x0; // data4,5
- tCAN->IF[u8IF_Num].DAT_B2 = 0x0; // data6,7
- }
- /*---------------------------------------------------------------------------*/
- /* Show Message Function */
- /*---------------------------------------------------------------------------*/
- void CAN_ShowMsg(STR_CANMSG_T* Msg)
- {
- uint8_t i;
- /* Show the message information */
- printf("Read ID=0x%X, Type=%s, DLC=%d, Data=", Msg->Id, Msg->IdType ? "EXT" : "STD", Msg->DLC);
- for(i = 0; i < Msg->DLC; i++)
- printf("%X,", Msg->Data[i]);
- printf("\n\n");
- }
- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Enable Internal RC 22.1184MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
- /* Waiting for Internal RC clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
- /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
- /* Enable external XTAL 12MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
- /* Waiting for external XTAL clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
- /* Set core clock as PLL_CLOCK from PLL */
- CLK_SetCoreClock(PLL_CLOCK);
- /* Enable UART module clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Enable CAN module clock */
- CLK_EnableModuleClock(CAN0_MODULE);
- //CLK_EnableModuleClock(CAN1_MODULE);
- /* Select UART module clock source */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set GPB multi-function pins for UART0 RXD and TXD */
- SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
- SYS->GPB_MFP |= SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;
- /* Set PD multi-function pins for CANTX0, CANRX0 */
- SYS->GPD_MFP &= ~(SYS_GPD_MFP_PD6_Msk | SYS_GPD_MFP_PD7_Msk);
- SYS->GPD_MFP = SYS_GPD_MFP_PD6_CAN0_RXD | SYS_GPD_MFP_PD7_CAN0_TXD;
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- void UART0_Init()
- {
- /* Reset IP */
- SYS_ResetModule(UART0_RST);
- /* Configure UART0 and set UART0 Baudrate */
- UART_Open(UART0, 115200);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Disable CAN Clock and Reset it */
- /*---------------------------------------------------------------------------------------------------------*/
- void CAN_STOP(void)
- {
- /* Disable CAN0 Clock and Reset it */
- SYS_ResetModule(CAN0_RST);
- CLK_DisableModuleClock(CAN0_MODULE);
- }
- /*----------------------------------------------------------------------------*/
- /* Some description about how to create test environment */
- /*----------------------------------------------------------------------------*/
- void Note_Configure()
- {
- printf("\n\n");
- printf("+--------------------------------------------------------------------------+\n");
- printf("| About CAN sample code configure |\n");
- printf("+--------------------------------------------------------------------------+\n");
- printf("| The sample code provide a simple sample code for you study CAN |\n");
- printf("| Before execute it, please check description as below |\n");
- printf("| |\n");
- printf("| 1.CAN_TX and CAN_RX should be connected to your CAN transceiver |\n");
- printf("| 2.Using two module board and connect to the same CAN BUS |\n");
- printf("| 3.Check the terminal resistor of bus is connected |\n");
- printf("| 4.Using UART0 as print message port |\n");
- printf("| |\n");
- printf("| |--------| |-----------| CANBUS |-----------| |--------| |\n");
- printf("| | |------>| |<--------->| |<------| | |\n");
- printf("| | |CAN_TX | CAN | CAN_H | CAN |CAN_TX | | |\n");
- printf("| | NUC131 | |Transceiver| |Transceiver| | NUC131 | |\n");
- printf("| | |<------| |<--------->| |------>| | |\n");
- printf("| | |CAN_RX | | CAN_L | |CAN_RX | | |\n");
- printf("| |--------| |-----------| |-----------| |--------| |\n");
- printf("| | | |\n");
- printf("| | | |\n");
- printf("| V V |\n");
- printf("| UART0 UART0 |\n");
- printf("|(print message) (print message) |\n");
- printf("+--------------------------------------------------------------------------+\n");
- }
- /*----------------------------------------------------------------------------*/
- /* Check the real baud-rate */
- /*----------------------------------------------------------------------------*/
- void BaudRateCheck(uint32_t u32BaudRate, uint32_t u32RealBaudRate)
- {
- /* Get Core Clock Frequency */
- SystemCoreClockUpdate();
- if(u32BaudRate != u32RealBaudRate)
- {
- printf("\nSet CAN baud-rate is fail\n");
- printf("Real baud-rate value(bps): %d\n", u32RealBaudRate);
- printf("CAN baud-rate calculation equation as below:\n");
- printf("CAN baud-rate(bps) = Fin/(BPR+1)*(Tseg1+Tseg2+3)\n");
- printf("where: Fin: System clock freq.(Hz)\n");
- printf(" BRP: The baud rate prescale. It is composed of BRP (CAN_BTIME[5:0]) and BRPE (CAN_BRPE[3:0]).\n");
- printf(" Tseg1: Time Segment before the sample point. You can set tseg1 (CAN_BTIME[11:8]).\n");
- printf(" Tseg2: Time Segment after the sample point. You can set tseg2 (CAN_BTIME[14:12]).\n");
- if(SystemCoreClock % u32BaudRate != 0)
- printf("\nThe BPR does not calculate, the Fin must be a multiple of the CAN baud-rate.\n");
- else
- printf("\nThe BPR does not calculate, the (Fin/(CAN baud-rate)) must be a multiple of the (Tseg1+Tseg1+3).\n");
- }
- else
- printf("\nReal baud-rate value(bps): %d\n", u32RealBaudRate);
- }
- /*----------------------------------------------------------------------------*/
- /* Set the CAN speed */
- /*----------------------------------------------------------------------------*/
- void SelectCANSpeed(CAN_T *tCAN)
- {
- uint32_t unItem, BaudRate = 0, RealBaudRate = 0;
- printf("Please select CAN speed you desired\n");
- printf("[0] 1000Kbps\n");
- printf("[1] 800Kbps\n");
- printf("[2] 500Kbps\n");
- printf("[3] 250Kbps\n");
- printf("[4] 125Kbps\n");
- printf("[5] 100Kbps\n");
- printf("[6] 50Kbps\n");
- unItem = GetChar();
- printf("%c\n", unItem);
- switch(unItem)
- {
- case '0':
- BaudRate = 1000000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);//Set target baud-rate and operation mode.
- break;
- case '1':
- BaudRate = 800000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- case '2':
- BaudRate = 500000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- case '3':
- BaudRate = 250000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- case '4':
- BaudRate = 125000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- case '5':
- BaudRate = 100000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- case '6':
- BaudRate = 50000;
- RealBaudRate = CAN_Open(tCAN, BaudRate, CAN_NORMAL_MODE);
- break;
- }
- /* Check the real baud-rate is OK */
- BaudRateCheck(BaudRate, RealBaudRate);
- }
- /*----------------------------------------------------------------------------*/
- /* Test Menu */
- /*----------------------------------------------------------------------------*/
- void TestItem(void)
- {
- printf("\n");
- printf("+------------------------------------------------------------------ +\n");
- printf("| Nuvoton CAN BUS DRIVER DEMO |\n");
- printf("+-------------------------------------------------------------------+\n");
- printf("| |\n");
- printf("| Receive a message by normal mode |\n");
- printf("| |\n");
- printf("+-------------------------------------------------------------------+\n");
- }
- /*----------------------------------------------------------------------------*/
- /* Send Rx Msg by Normal Mode Function (With Message RAM) */
- /*----------------------------------------------------------------------------*/
- void Test_NormalMode_Rx(CAN_T *tCAN)
- {
- CAN_EnableInt(tCAN, CAN_CON_IE_Msk | CAN_CON_SIE_Msk); /* Enable CAN interrupt and corresponding NVIC of CAN */
- NVIC_SetPriority(CAN0_IRQn, (1 << __NVIC_PRIO_BITS) - 2); /* Install CAN call back functions */
- NVIC_EnableIRQ(CAN0_IRQn);
- if(CAN_SetRxMsg(tCAN, MSG(0), CAN_STD_ID, 0x7FF) == FALSE)
- {
- printf("Set Rx Msg Object failed\n");
- return;
- }
- if(CAN_SetRxMsg(tCAN, MSG(5), CAN_EXT_ID, 0x12345) == FALSE)
- {
- printf("Set Rx Msg Object failed\n");
- return;
- }
- if(CAN_SetRxMsg(tCAN, MSG(31), CAN_EXT_ID, 0x7FF01) == FALSE)
- {
- printf("Set Rx Msg Object failed\n");
- return;
- }
- printf("Wait Msg\n");
- printf("Enter any key to exit\n");
- GetChar();
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* MAIN function */
- /*---------------------------------------------------------------------------------------------------------*/
- int main(void)
- {
- CAN_T *tCAN;
- tCAN = (CAN_T *) CAN0;
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Init System, IP clock and multi-function I/O */
- SYS_Init();
- /* Lock protected registers */
- SYS_LockReg();
- /* Init UART0 for printf */
- UART0_Init();
- /*---------------------------------------------------------------------------------------------------------*/
- /* SAMPLE CODE */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Some description about how to create test environment */
- Note_Configure();
- /* Configuring the Bit Timing */
- SelectCANSpeed(tCAN);
- /* Test Menu */
- TestItem();
- printf("Receive a message by normal mode\n\n");
- /* Send Rx Msg by Normal Mode Function (With Message RAM) */
- Test_NormalMode_Rx(tCAN);
- /* Disable CAN */
- CAN_Close(tCAN);
- /* Disable CAN Clock and Reset it */
- CAN_STOP();
- while(1);
- }