rusefi/firmware/hw_layer/can_hw.c

/**
 * @file	can_hw.c
 * @brief	CAN bus low level code
 *
 * todo: this file should be split into two - one for CAN transport level ONLY and
 * another one with actual messages
 *
 * @date Dec 11, 2013
 * @author Andrey Belomutskiy, (c) 2012-2014
 */

#include "main.h"
#include "can_hw.h"
#include "pin_repository.h"
#include "string.h"
#include "engine_state.h"
#include "can_header.h"
#include "engine_configuration.h"

#if EFI_CAN_SUPPORT

static int canReadCounter = 0;
static Logging logger;
static WORKING_AREA(canTreadStack, UTILITY_THREAD_STACK_SIZE);

extern engine_configuration_s *engineConfiguration;
extern engine_configuration2_s *engineConfiguration2;

/*
 * 500KBaud
 * automatic wakeup
 * automatic recover from abort mode
 * See section 22.7.7 on the STM32 reference manual.
 *
 * speed = 42000000 / (BRP + 1) / (1 + TS1 + 1 + TS2 + 1)
 * 42000000 / 7 / 12 = 500000
 *
 *
 */
static const CANConfig canConfig = {
CAN_MCR_ABOM | CAN_MCR_AWUM | CAN_MCR_TXFP,
CAN_BTR_SJW(0) | CAN_BTR_TS2(1) |
CAN_BTR_TS1(8) | CAN_BTR_BRP(6) };

static CANRxFrame rxBuffer;
static CANTxFrame txmsg;

// todo: we would need a data structure here
static int engine_rpm = 0;
static float engine_clt = 0;

static void printPacket(CANRxFrame *rx) {
//	scheduleMsg(&logger, "CAN FMI %x", rx->FMI);
//	scheduleMsg(&logger, "TIME %x", rx->TIME);
	scheduleMsg(&logger, "SID %x/%x %x %x %x %x %x %x %x %x", rx->SID, rx->DLC,
			rx->data8[0], rx->data8[1], rx->data8[2], rx->data8[3],
			rx->data8[4], rx->data8[5], rx->data8[6], rx->data8[7]);

	if (rx->SID == CAN_BMW_E46_CLUSTER_STATUS) {
		int odometerKm = 10 * (rx->data8[1] << 8) + rx->data8[0];
		int odometerMi = (int)(odometerKm * 0.621371);
		scheduleMsg(&logger, "GOT odometerKm %d", odometerKm);
		scheduleMsg(&logger, "GOT odometerMi %d", odometerMi);
		int timeValue = (rx->data8[4] << 8) + rx->data8[3];
		scheduleMsg(&logger, "GOT time %d", timeValue);
	}
}

static void setShortValue(CANTxFrame *txmsg, int value, int offset) {
	txmsg->data8[offset] = value;
	txmsg->data8[offset + 1] = value >> 8;
}

static void commonTxInit(int eid) {
	memset(&txmsg, 0, sizeof(txmsg));
	txmsg.IDE = CAN_IDE_STD;
	txmsg.EID = eid;
	txmsg.RTR = CAN_RTR_DATA;
	txmsg.DLC = 8;
}

static void canDashboardBMW(void) {
	//BMW Dashboard
	commonTxInit(CAN_BMW_E46_SPEED);
	setShortValue(&txmsg, 10 * 8, 1);
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );

	commonTxInit(CAN_BMW_E46_RPM);
	setShortValue(&txmsg, (int)(engine_rpm * 6.4), 2);
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );

	commonTxInit(CAN_BMW_E46_DME2);
	setShortValue(&txmsg, (int)((engine_clt + 48.373) / 0.75), 1);
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );
}

static void canDashboardFiat(void) {
	//Fiat Dashboard
	commonTxInit(CAN_FIAT_MOTOR_INFO);
	setShortValue(&txmsg, (int)(engine_clt - 40), 3); //Coolant Temp
	setShortValue(&txmsg, engine_rpm / 32, 6); //RPM
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );
}

static void canDashboardVAG(void) {
	//VAG Dashboard
	commonTxInit(CAN_VAG_RPM);
	setShortValue(&txmsg, engine_rpm * 4, 2); //RPM
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );

	commonTxInit(CAN_VAG_CLT);
	setShortValue(&txmsg, (int)((engine_clt + 48.373) / 0.75), 1); //Coolant Temp
	canTransmit(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &txmsg, TIME_INFINITE );
}

static void canInfoNBCBroadcast(can_nbc_e typeOfNBC) {
	switch (typeOfNBC) {
	case CAN_BUS_NBC_BMW:
		canDashboardBMW();
		break;
	case CAN_BUS_NBC_FIAT:
		canDashboardFiat();
		break;
	case CAN_BUS_NBC_VAG:
		canDashboardVAG();
		break;
	default:
		break;
	}
}

static void enableCanRead(int value) {
	engineConfiguration->canReadEnabled = value;
}

static void canRead(void) {
	scheduleMsg(&logger, "waiting for CAN");
	canReceive(&EFI_CAN_DEVICE, CAN_ANY_MAILBOX, &rxBuffer, TIME_INFINITE );

	canReadCounter++;
	printPacket(&rxBuffer);
}


static void writeStateToCan(void) {
	engine_rpm = getRpm();
	engine_clt = getCoolantTemperature();

	canInfoNBCBroadcast(engineConfiguration->can_nbc_type);

}

static msg_t canThread(void *arg) {
	chRegSetThreadName("CAN");
	while (TRUE) {
		if(engineConfiguration->canWriteEnabled)
			writeStateToCan();

		if(engineConfiguration->canReadEnabled)
			canRead(); // todo: since this is a blocking operation, do we need a separate thread for 'write'?


		chThdSleepMilliseconds(engineConfiguration->can_sleep_period);
	}
#if defined __GNUC__
	return -1;
#endif
}

static void canInfo(void) {
	scheduleMsg(&logger, "CAN TX %s:%d", portname(EFI_CAN_TX_PORT), EFI_CAN_TX_PIN);
	scheduleMsg(&logger, "CAN RX %s:%d", portname(EFI_CAN_RX_PORT), EFI_CAN_RX_PIN);
	scheduleMsg(&logger, "canReadEnabled=%d canWriteEnabled=%d", engineConfiguration->canReadEnabled, engineConfiguration->canWriteEnabled);

	scheduleMsg(&logger, "CAN rx count %d", canReadCounter);
}

void initCan(void) {
	initLogging(&logger, "CAN driver");

#if STM32_CAN_USE_CAN2
	// CAN1 is required for CAN2
	canStart(&CAND1, &canConfig);
	canStart(&CAND2, &canConfig);
#else
	canStart(&CAND1, &canConfig);
#endif

	canStart(&EFI_CAN_DEVICE, &canConfig);
	chThdCreateStatic(canTreadStack, sizeof(canTreadStack), NORMALPRIO, (tfunc_t) canThread, NULL );

	mySetPadMode("CAN TX", EFI_CAN_TX_PORT, EFI_CAN_TX_PIN, PAL_MODE_ALTERNATE(EFI_CAN_TX_AF));
	mySetPadMode("CAN RX", EFI_CAN_RX_PORT, EFI_CAN_RX_PIN, PAL_MODE_ALTERNATE(EFI_CAN_RX_AF));

	addConsoleActionI("enable_can_read", enableCanRead);

	addConsoleAction("caninfo", canInfo);
}

#endif /* EFI_CAN_SUPPORT */