lpc17xx Drivers.rar

/***********************************************************************//** * @file lpc17xx_can.c * @brief Contains all functions support for CAN firmware library on LPC17xx * @version 3.2 * @date 06. Dec. 2010 * @author NXP MCU SW Application Team ************************************************************************** * Software that is described herein is for illustrative purposes only * which provides customers with programming information regarding the * products. This software is supplied "AS IS" without any warranties. * NXP Semiconductors assumes no responsibility or liability for the * use of the software, conveys no license or title under any patent, * copyright, or mask work right to the product. NXP Semiconductors * reserves the right to make changes in the software without * notification. NXP Semiconductors also make no representation or * warranty that such application will be suitable for the specified * use without further testing or modification. **********************************************************************/ /* Peripheral group ----------------------------------------------------------- */ /** @addtogroup CAN * @{ */ /* Includes ------------------------------------------------------------------- */ #include "lpc17xx_can.h" #include "lpc17xx_clkpwr.h" /* If this source file built with example, the LPC17xx FW library configuration * file in each example directory ("lpc17xx_libcfg.h") must be included, * otherwise the default FW library configuration file must be included instead */ #ifdef __BUILD_WITH_EXAMPLE__ #include "lpc17xx_libcfg.h" #else #include "lpc17xx_libcfg_default.h" #endif /* __BUILD_WITH_EXAMPLE__ */ #ifdef _CAN /* Private Variables ---------------------------------------------------------- */ /** @defgroup CAN_Private_Variables CAN Private Variables * @{ */ FunctionalState FULLCAN_ENABLE; /* Counts number of filters (CAN message objects) used */ uint16_t CANAF_FullCAN_cnt = 0; uint16_t CANAF_std_cnt = 0; uint16_t CANAF_gstd_cnt = 0; uint16_t CANAF_ext_cnt = 0; uint16_t CANAF_gext_cnt = 0; /* End of Private Variables ----------------------------------------------------*/ /** * @} */ /* Private Variables ---------------------------------------------------------- */ static void can_SetBaudrate (LPC_CAN_TypeDef *CANx, uint32_t baudrate); /*********************************************************************//** * @brief Setting CAN baud rate (bps) * @param[in] CANx point to LPC_CAN_TypeDef object, should be: * - LPC_CAN1: CAN1 peripheral * - LPC_CAN2: CAN2 peripheral * @param[in] baudrate: is the baud rate value will be set * @return None ***********************************************************************/ static void can_SetBaudrate (LPC_CAN_TypeDef *CANx, uint32_t baudrate) { uint32_t result = 0; uint8_t NT, TSEG1, TSEG2, BRFail; uint32_t CANPclk = 0; uint32_t BRP; CHECK_PARAM(PARAM_CANx(CANx)); if (CANx == LPC_CAN1) { CANPclk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_CAN1); } else { CANPclk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_CAN2); } result = CANPclk / baudrate; /* Calculate suitable nominal time value * NT (nominal time) = (TSEG1 + TSEG2 + 3) * NT <= 24 * TSEG1 >= 2*TSEG2 */ BRFail = 1; for(NT=24;NT>0;NT=NT-2) { if ((result%NT)==0) { BRP = result / NT - 1; NT--; TSEG2 = (NT/3) - 1; TSEG1 = NT -(NT/3) - 1; BRFail = 0; break; } } if(BRFail) while(1); // Failed to calculate exact CAN baud rate /* Enter reset mode */ CANx->MOD = 0x01; /* Set bit timing * Default: SAM = 0x00; * SJW = 0x03; */ CANx->BTR = (TSEG2<<20)|(TSEG1<<16)|(3<<14)|BRP; /* Return to normal operating */ CANx->MOD = 0; } /* End of Private Functions ----------------------------------------------------*/ /* Public Functions ----------------------------------------------------------- */ /** @addtogroup CAN_Public_Functions * @{ */ /********************************************************************//** * @brief Initialize CAN peripheral with given baudrate * @param[in] CANx pointer to LPC_CAN_TypeDef, should be: * - LPC_CAN1: CAN1 peripheral * - LPC_CAN2: CAN2 peripheral * @param[in] baudrate: the value of CAN baudrate will be set (bps) * @return None *********************************************************************/ void CAN_Init(LPC_CAN_TypeDef *CANx, uint32_t baudrate) { uint32_t temp; uint16_t i; CHECK_PARAM(PARAM_CANx(CANx)); if(CANx == LPC_CAN1) { /* Turn on power and clock for CAN1 */ CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCAN1, ENABLE); /* Set clock divide for CAN1 */ } else { /* Turn on power and clock for CAN1 */ CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCAN2, ENABLE); /* Set clock divide for CAN2 */ } CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_CAN1, CLKPWR_PCLKSEL_CCLK_DIV_2); CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_CAN2, CLKPWR_PCLKSEL_CCLK_DIV_2); CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_ACF, CLKPWR_PCLKSEL_CCLK_DIV_2); CANx->MOD = 1; // Enter Reset Mode CANx->IER = 0; // Disable All CAN Interrupts CANx->GSR = 0; /* Request command to release Rx, Tx buffer and clear data overrun */ //CANx->CMR = CAN_CMR_AT | CAN_CMR_RRB | CAN_CMR_CDO; CANx->CMR = (1<<1)|(1<<2)|(1<<3); /* Read to clear interrupt pending in interrupt capture register */ temp = CANx->ICR; CANx->MOD = 0;// Return Normal operating //Reset CANAF value LPC_CANAF->AFMR = 0x01; //clear ALUT RAM for (i = 0; i < 512; i++) { LPC_CANAF_RAM->mask[i] = 0x00; } LPC_CANAF->SFF_sa = 0x00; LPC_CANAF->SFF_GRP_sa = 0x00; LPC_CANAF->EFF_sa = 0x00; LPC_CANAF->EFF_GRP_sa = 0x00; LPC_CANAF->ENDofTable = 0x00; LPC_CANAF->AFMR = 0x00; /* Set baudrate */ can_SetBaudrate (CANx, baudrate); } /********************************************************************//** * @brief CAN deInit * @param[in] CANx pointer to LPC_CAN_TypeDef, should be: * - LPC_CAN1: CAN1 peripheral * - LPC_CAN2: CAN2 peripheral * @return None *********************************************************************/ void CAN_DeInit(LPC_CAN_TypeDef *CANx) { CHECK_PARAM(PARAM_CANx(CANx)); if(CANx == LPC_CAN1) { /* Turn on power and clock for CAN1 */ CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCAN1, DISABLE); } else { /* Turn on power and clock for CAN1 */ CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCAN2, DISABLE); } } /********************************************************************//** * @brief Setup Acceptance Filter Look-Up Table * @param[in] CANAFx pointer to LPC_CANAF_TypeDef * Should be: LPC_CANAF * @param[in] AFSection the pointer to AF_SectionDef structure * It contain information about 5 sections will be install in AFLUT * @return CAN Error could be: * - CAN_OBJECTS_FULL_ERROR: No more rx or tx objects available * - CAN_AF_ENTRY_ERROR: table error-violation of ascending numerical order * - CAN_OK: ID is added into table successfully *********************************************************************/ CAN_ERROR CAN_SetupAFLUT(LPC_CANAF_TypeDef* CANAFx, AF_SectionDef* AFSection) { uint8_t ctrl1,ctrl2; uint8_t dis1, dis2; uint16_t SID, SID_temp,i, count = 0; uint32_t EID, EID_temp, entry, buf; uint16_t lowerSID, upperSID; uint32_t lowerEID, upperEID; CHECK_PARAM(PARAM_CANAFx(CANAFx)); CANAFx->AFMR = 0x01; /***** setup FullCAN Table *****/ if(AFSection->FullCAN_Sec == NULLNULL) { FULLCAN_ENABLE = DISABLE; } else { FULLCAN_ENABLE = ENABLE; for(i=0;i<(AFSection->FC_NumEntry);i++) { if(count + 1 > 64) { return CAN_OBJECTS_FULL_ERROR; } ctrl1 = AFSection->FullCAN_Sec->controller; SID = AFSection->FullCAN_Sec->id_11; dis1 = AFSection->FullCAN_Sec->disable; CHECK_PARAM(PARAM_CTRL(ctrl1)); CHECK_PARAM(PARAM_ID_11