mcp3208.cpp File Reference

Functions
static int	getValue (McpAdcState *state, int channel)
int	getMcp3208adc (int channel)
static int	getNextChannel (void)
static void	spiCallback (SPIDriver *spip)
static void	createRequest (McpAdcState *state, int channel)
void	requestAdcValue (McpAdcState *state, int channel)
void	requestAdcValueI (McpAdcState *state, int channel)
void	adc_in_out (McpAdcState *state)
void	init_adc_mcp3208 (McpAdcState *state, SPIDriver *driver)

Variables
McpAdcState *	hack
static int	adcEventCounter = 0
static int	adcErrorCounter = 0
static const SPIConfig	spicfg

Function Documentation

adc_in_out()

void adc_in_out

(

McpAdcState *

state

)

Definition at line 96 of file mcp3208.cpp.

                                    {
 
//  chThdSleepMilliseconds(10);
 
    int result = state->results[0];
 
//  int v = result;
    unsigned r = 0;
//
//  while (v >>= 1)
//      r++;
//
//  unsigned int f;
//  if (r < 12) {
//      f = -1;
//  } else {
//      f = result >> (r - 12);
//      f = f & 4095;
//  }
 
    int errRatio = 1000 * adcErrorCounter / adcEventCounter;
 
    print("c/e %7d/%7d/%4d  result %5d r=%d ", adcEventCounter, adcErrorCounter, errRatio, result, r);
 
    unsigned int f0 = getValue(state, 0);
    print("ch0=%d adj %d    ", f0, f0 * 5000 / 4096);
    unsigned int f1 = getValue(state, 1);
    print("ch1=%d adj %d\r\n", f1, f1 * 5000 / 4096);
}

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createRequest()

static void createRequest ( McpAdcState *  state, int  channel  )

static

Definition at line 71 of file mcp3208.cpp.

                                                           {
    efiAssertVoid(ObdCode::CUSTOM_ERR_6680, channel < 8, "Invalid ADC channel");
 
    state->requestedChannel = channel;
 
    state->tx_buff[0] = 0x06 + (channel >> 2);
    state->tx_buff[1] = (channel & 3) << 6;
}

Referenced by requestAdcValue(), and requestAdcValueI().

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getMcp3208adc()

int getMcp3208adc

(

int

channel

)

Definition at line 25 of file mcp3208.cpp.

                               {
    return getValue(hack, channel);
}

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getNextChannel()

static int getNextChannel ( void  )

static

Definition at line 29 of file mcp3208.cpp.

                                {
    return adcEventCounter % 2;
}

Referenced by spiCallback().

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getValue()

static int getValue ( McpAdcState *  state, int  channel  )

static

Definition at line 21 of file mcp3208.cpp.

                                                     {
    return state->results[channel] & 4095;
}

Referenced by adc_in_out(), and getMcp3208adc().

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init_adc_mcp3208()

void init_adc_mcp3208	(	McpAdcState *	state,
		SPIDriver *	driver
	)

Definition at line 126 of file mcp3208.cpp.

                                                             {
    state->driver = driver;
    state->tx_buff[2] = 0;
 
    hack = state;
 
    todo: convert to new API, todo: array of CS
    mySetPadMod("ext adc chip select", MCP3208_CS_PORT, MCP3208_CS_PIN, PAL_STM32_MODE_OUTPUT);
 
 
    spiStart(driver, &spicfg);
}

requestAdcValue()

void requestAdcValue	(	McpAdcState *	state,
		int	channel
	)

Definition at line 80 of file mcp3208.cpp.

                                                      {
    createRequest(state, channel);
 
    spiSelect(state->driver);
    spiStartExchange(state->driver, 3, state->tx_buff, state->rx_buff);
    // SPI unselect is in the callback
}

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requestAdcValueI()

void requestAdcValueI	(	McpAdcState *	state,
		int	channel
	)

Definition at line 88 of file mcp3208.cpp.

                                                       {
    createRequest(state, channel);
 
    spiSelectI(state->driver);
    spiStartExchangeI(state->driver, 3, state->tx_buff, state->rx_buff);
    // SPI unselect is in the callback
}

Referenced by spiCallback().

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spiCallback()

static void spiCallback ( SPIDriver *  spip )

static

Definition at line 33 of file mcp3208.cpp.

                                         {
    spiUnselectI(spip);
    adcEventCounter++;
 
    McpAdcState *state = hack;
 
    int withError = 0;
 
    if (state->rx_buff[0] != 255) {
        withError = 1;
        //fatal("ADC: first byte");
    }
 
    if ((state->rx_buff[1] & 0xE0) != 0xE0) {
        withError = 1;
        //fatal("ADC: second byte");
    }
 
    if (!withError) {
//      unsigned char upperByte = state->rx_buff[1] & 0b00001111;
        int result = (state->rx_buff[0] << 16) + (state->rx_buff[1] << 8) + state->rx_buff[2];
        state->results[state->requestedChannel] = result;
    } else {
        adcErrorCounter++;
    }
 
    requestAdcValueI(state, getNextChannel());
}

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Variable Documentation

adcErrorCounter

int adcErrorCounter = 0

static

Definition at line 19 of file mcp3208.cpp.

Referenced by adc_in_out(), and spiCallback().

adcEventCounter

int adcEventCounter = 0

static

Definition at line 18 of file mcp3208.cpp.

Referenced by adc_in_out(), getNextChannel(), and spiCallback().

hack

McpAdcState* hack

Definition at line 16 of file mcp3208.cpp.

Referenced by getMcp3208adc(), init_adc_mcp3208(), and spiCallback().

spicfg

const SPIConfig spicfg

static

Initial value:

= { spiCallback,
 
MCP3208_CS_PORT,
MCP3208_CS_PIN,
 
        SPI_CR1_BR_0 | SPI_CR1_BR_1 | SPI_CR1_BR_2
 
        }

Definition at line 62 of file mcp3208.cpp.

Referenced by init_adc_mcp3208().

Go to the source code of this file.