poten.cpp File Reference

Detailed Description

MCP42010 digital potentiometer driver.

Date

Mar 16, 2013

Author

Andrey Belomutskiy, (c) 2012-2020

Definition in file poten.cpp.

Functions
void	initPotentiometer (Mcp42010Driver *driver, SPIDriver *spi, brain_pin_e csPin)
static int	getPotStep (int resistanceWA)
static void	sendToPot (Mcp42010Driver *driver, int channel, int value)
void	setPotResistance (Mcp42010Driver *driver, int channel, int resistance)
static void	setPotResistanceCommand (int index, int value)
static void	setPotValue1 (int value)
void	initPotentiometers ()

Variables
static Mcp42010Driver	potConfig [DIGIPOT_COUNT]

Function Documentation

getPotStep()

static int getPotStep ( int  resistanceWA )

static

Definition at line 58 of file poten.cpp.

                                        {
    return 256 - (int) ((resistanceWA - 52) * 256 / 10000);
}

Referenced by setPotResistance().

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initPotentiometer()

void initPotentiometer	(	Mcp42010Driver *	driver,
		SPIDriver *	spi,
		brain_pin_e	csPin
	)

Definition at line 52 of file poten.cpp.

                                                                                  {
    driver->spiConfig.cr1 = SPI_POT_CONFIG;
    driver->spi = spi;
    initSpiCs(&driver->spiConfig, csPin);
}

Referenced by initPotentiometers().

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initPotentiometers()

void initPotentiometers

(

)

Definition at line 90 of file poten.cpp.

                          {
#if EFI_POTENTIOMETER
    if (engineConfiguration->digitalPotentiometerSpiDevice == SPI_NONE) {
        efiPrintf("digiPot spi disabled");
        return;
    }
    // todo: we have centralized SPI management see other usages of 'turnOnSpi'
    //turnOnSpi(engineConfiguration->digitalPotentiometerSpiDevice);
 
    for (int i = 0; i < DIGIPOT_COUNT; i++) {
        brain_pin_e csPin = engineConfiguration->digitalPotentiometerChipSelect[i];
        if (!isBrainPinValid(csPin)) {
            continue;
                }
 
        SPIDriver *driver = getSpiDevice(engineConfiguration->digitalPotentiometerSpiDevice);
        if (driver == NULL) {
            // error already reported
            return;
        }
 
        initPotentiometer(&potConfig[i], driver, csPin);
    }
 
    addConsoleActionII("pot", setPotResistanceCommand);
 
    addConsoleActionI("potd1", setPotValue1);
 
    setPotResistance(&potConfig[0], 0, 3000);
    setPotResistance(&potConfig[0], 1, 7000);
#endif
}

Referenced by initEngineEmulator().

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sendToPot()

static void sendToPot ( Mcp42010Driver *  driver, int  channel, int  value  )

static

Definition at line 62 of file poten.cpp.

                                                                      {
    lockSpi(SPI_NONE);
    spiStart(driver->spi, &driver->spiConfig);
    spiSelect(driver->spi);
    int word = (17 + channel) * 256 + value;
    spiSend(driver->spi, 1, &word);
    spiUnselect(driver->spi);
    spiStop(driver->spi);
    unlockSpi(SPI_NONE);
}

Referenced by setPotResistance(), and setPotValue1().

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setPotResistance()

void setPotResistance	(	Mcp42010Driver *	driver,
		int	channel,
		int	resistance
	)

Definition at line 73 of file poten.cpp.

                                                                           {
    int value = getPotStep(resistance);
 
    efiPrintf("Sending to potentiometer%d: %d for R=%d", channel, value, resistance);
    sendToPot(driver, channel, value);
}

Referenced by initPotentiometers(), and setPotResistanceCommand().

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setPotResistanceCommand()

static void setPotResistanceCommand ( int  index, int  value  )

static

Definition at line 80 of file poten.cpp.

                                                          {
    setPotResistance(&potConfig[index / 2], index % 2, value);
}

Referenced by initPotentiometers().

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setPotValue1()

static void setPotValue1 ( int  value )

static

Definition at line 84 of file poten.cpp.

                                    {
    sendToPot(&potConfig[0], 1, value);
}

Referenced by initPotentiometers().

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Variable Documentation

potConfig

Mcp42010Driver potConfig[DIGIPOT_COUNT]

static

Definition at line 50 of file poten.cpp.

Referenced by initPotentiometers(), setPotResistanceCommand(), and setPotValue1().

Go to the source code of this file.