void mTouchCapPhy_TickInit( void )
{
TMR4 = 0;
//If the Low power demo is not enabled
#ifndef LOW_POWER_DEMO_ENABLE
PR4 = TIMER_PERIOD;
T4CON = TIMER_ON | TIMER_SOURCE_INTERNAL | GATED_TIME_DISABLED | TIMER_16BIT_MODE | TIMER4_PRESCALER;
//If Low Power demo is enabled
#else
//If the Primary oscillator is switched to FRC for the Low Power Demo then load PR4 with
//the period value which is calculated for FRC
// The time period is selected such that the functions mTouchCapPhy_ReadCTMU() and mTouchCapPhy_AverageData()
// should be executed within the time period
//Clock_Switch_Enable_Flag -- this will indicate that clock is switched from Primary to FRC
if(Clock_Switch_Enable_Flag)
{
PR4=TIMER_PERIOD_WITH_FRC; //Timer value when FRC is used for Timer4 interrupt;
T4CON = TIMER_ON | TIMER_SOURCE_INTERNAL | GATED_TIME_DISABLED | TIMER_16BIT_MODE | TIMER4_PRESCALER;
Timer4_Period_Clock_Switch_Flag =HIGH; //To indicate that the timer4 init for FRC clock is complete
}
//If the Primary Oscillator is used
else
{
PR4 = TIMER_PERIOD;
T4CON = TIMER_ON | TIMER_SOURCE_INTERNAL | GATED_TIME_DISABLED | TIMER_16BIT_MODE | TIMER4_PRESCALER;
}
#endif //end of #ifndef LOW_POWER_DEMO_ENABLE
Set_ScanTimer_IF_Bit_State(DISABLE); //Clear flag
Set_ScanTimer_IE_Bit_State(ENABLE); //Enable interrupt
Set_ScanTimer_ON_Bit_State(ENABLE) ; //Run timer
}
void __ISR(_TIMER_4_VECTOR, IPL1SOFT) mTouchCapTmr_Tmr4ISR(void)
#endif
{
void (*ptr_fcn)(void);
/* init local wiht the callback function ptr */
ptr_fcn = (void (*) ())T4CallBackISR;
if (ptr_fcn != 0)
{
// call the callback isr
(*ptr_fcn)();
}
Set_ScanTimer_IF_Bit_State(DISABLE); //Clear interrupt flag
if ( EmTouchDataReady == TRUE )
{
Set_ScanTimer_IE_Bit_State(DISABLE); // Disable interrupt
Set_ScanTimer_ON_Bit_State(DISABLE); // Stop timer 4
}
}
/******************************************************************************
* Function: void InitTimer(void)
*
* PreCondition: None
*
* Input: unsigned int time
*
* Output: None
*
* Side Effects: None
*
* Overview: Set the period for timer 4 depending on input param time
*
* Note: Stops and restarts the timer when setting the new period
*****************************************************************************/
void mTouchCapTmr_InitTimer4(void)
{
// set up the timer interrupt with a priority of 1
Set_ScanTimer_Priority(1);
// interrupt subpriority is 0
Set_ScanTimer_Subpriority(0);
// clear the interrupt flag
Set_ScanTimer_IF_Bit_State(0);
// initialize the callback pointer with the value passed as argument
T4CallBackISR = TIMERCALLBACKFUNC;
/* enable the interrupt */
Set_ScanTimer_IE_Bit_State(1);
TMR4 = 0;
PR4 = TIMER4_PERIOD;
// restart the timer
Set_ScanTimer_ON_Bit_State(1);
return;
}
int main(void)
{
#if defined( DUMP_DIAGNOSTICS_VIA_UART )
char ButtonMeasString[133];
# if defined( UART_DUMP_RAW_COUNTS ) || \
defined( UART_DUMP_ALL_COUNTS )
UINT16 iHF_Read;
# endif//defined( UART_DUMP_RAW_COUNTS )...
#endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
UINT16 CurrentButtonStatus, LastButtonStatus, CurrentButtonAsserts = 0,
CurrentButtonMeasurements[MAX_ADC_CHANNELS],
CurrentAveragedMeasurements[MAX_ADC_CHANNELS];
UINT16 CurrentWeights[MAX_ADC_CHANNELS];
CFGCONbits.JTAGEN = 0; // Disable JTAG
// Initalize global interrupt enable
INTEnableSystemMultiVectoredInt();
// Configure the device for maximum performance
// Given the options, this function will change the flash wait states, RAM
// wait state and enable prefetch cache but will not change the PBDIV.
// The PBDIV value is already set via the pragma FPBDIV option.
SYSTEMConfig(SYS_FREQ, SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);
#if defined( DUMP_DIAGNOSTICS_VIA_UART )
// Setup UART2 for transmission of button data.
// Taken from C:\Program Files\Microchip\mplabc32\v1.12\examples\plib_examples\uart\uart_basic
UARTConfigure(UART2, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(UART2, UART_INTERRUPT_ON_TX_NOT_FULL | UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(UART2, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);
UARTSetDataRate(UART2, GetPeripheralClock(), 115200 );
UARTEnable(UART2, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_TX ));
// RPS setup to bring U1TX out on pin 33 (RB4) to Switch 2 on board
PPSOutput(4,RPC4,U2TX);
#endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
// Setup data structures for using Direct Keys
mTouchCapApp_MatrixKeys_Create();
/* This is mandatory function call to initilize physical layer.
Call this function before any application layer code. */
mTouchCapAPI_Init();
// Initial startup demo of board LEDs.
PORTB = PORTB_ROW_ALL | PORTB_COL_ALL; //Turn on all LEDs
PORTC = PORTC_ROW_ALL | PORTC_COL_ALL;
DelayMs(1000);
mTouchCapLED_PowerUpSequence(); // turn on each LED in sliding motion
PORTB = PORTB_ROW_ALL | PORTB_COL_ALL; //Turn on all LEDs
PORTC = PORTC_ROW_ALL | PORTC_COL_ALL;
DelayMs(1000);
PORTB = PORTB_ROW_NIL | PORTB_COL_NIL; //Turn off all LEDs
PORTC = PORTC_ROW_NIL | PORTC_COL_NIL;
// Start button measurements
Set_ScanTimer_IE_Bit_State(ENABLE); //Enable interrupt
Set_ScanTimer_ON_Bit_State(ENABLE); //Run timer
// Setup for detection/interpretation
LastButtonStatus = 0;
while(1)
{
if(EmTouchDataReady == 1) //This flag is set by Timer ISR when all channels have been read
{
// Calculate new button values and return the measurement updates
mTouchCapPhy_UpdateData(CurrentButtonMeasurements,
CurrentAveragedMeasurements,
CurrentWeights,
TRUE, FILTER_METHOD_USECHANNEL);
// Update button and LED status and return button status for use with mTouch GUI on PC
CurrentButtonStatus = mTouchCapApp_MatrixKeys_Demo();
// Check for button asserts: If buttons were pressed before, but none pressed now
if ( LastButtonStatus > 0 && CurrentButtonStatus == 0 )
{
CurrentButtonAsserts = LastButtonStatus; //Buttons have fired.
}
else
{ // Commented out to provide memory of last button asserted.
//ButtonAsserts = 0;
}
/*
Determining Channel Load Order:
Button Layout:
Column: Col 1 Col 2 Col 3 Col 4
AN0 AN1 AN4 AN5
Row 1: AN8 Btn 0 Btn 1 Btn 2 Btn 3
Row 2: AN7 Btn 4 Btn 5 Btn 6 Btn 7
Row 3: AN6 Btn 8 Btn 9 Btn10 Btn11
Resulting load Order
(AN8,AN0), (AN8,AN1), (AN8,AN4), (AN8,AN5),
(AN7,AN0), (AN7,AN1), (AN7,AN4), (AN7,AN5),
(AN6,AN0), (AN6,AN1), (AN6,AN4), (AN6,AN5),
Removing channels already loaded:
(AN8,AN0), (---,AN1), (---,AN4), (---,AN5),
(AN7,---), (---,---), (---,---), (---,---),
(AN6,---), (---,---), (---,---), (---,---),
So the channels are loaded into memory in this order:
Channel Load: #0, #1, #2, #3, #4, #5, #6
ADC Channel: AN8, AN0, AN1, AN4, AN5, AN13, AN12
Button Func: Row1, Col1, Col2, Col3, Col4, Row2, Row3
Sorting to output rows in order followed by columns:
Channel Load: #0, #5, #6, #1, #2, #3, #4,
Button Func: Row1, Row2, Row3, Col1, Col2, Col3, Col4,
This order is used below to output measurements to the mTouch GUI
or to a hyperterminal for later analysis.
*/
# if defined( UART_DUMP_RAW_COUNTS )
for ( iHF_Read = 0; iHF_Read < NUM_HF_READS; iHF_Read++ )
# elif defined( UART_DUMP_ALL_COUNTS )
for ( iHF_Read = 0; iHF_Read < 3*NUM_HF_READS; iHF_Read++ )
# endif
# if defined( UART_DUMP_RAW_COUNTS ) || defined( UART_DUMP_ALL_COUNTS )
{
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d\r\n",
CurrentButtonStatus,CurrentButtonAsserts,
CurRawData[iHF_Read][0],CurRawData[iHF_Read][5],CurRawData[iHF_Read][6], 0,
CurRawData[iHF_Read][1],CurRawData[iHF_Read][2],CurRawData[iHF_Read][3],CurRawData[iHF_Read][4],
0,0,0,0,
0,0,0,0,
iHF_Read+1);
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
}
# endif
#if defined( DUMP_DIAGNOSTICS_VIA_UART )
// Format report string
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d\r\n",
CurrentButtonStatus, CurrentButtonAsserts, 0, // Zero for slider value
CurrentButtonMeasurements[0], //Row 1: AN14: Load #0
CurrentButtonMeasurements[5], //Row 2: AN13: Load #5
CurrentButtonMeasurements[6], //Row 3: AN12: Load #6
0, //Placeholder for unused row
CurrentButtonMeasurements[1], //Col 1: AN8: Load #1
CurrentButtonMeasurements[2], //Col 2: AN9: Load #2
CurrentButtonMeasurements[3], //Col 3: AN10: Load #3
CurrentButtonMeasurements[4]);//Col 4: AN11: Load #4
// Send report string back to mTouch GUI via UART #2
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
# endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
LastButtonStatus = CurrentButtonStatus; //Remember button status
EmTouchDataReady = 0; //clear flag
Set_ScanTimer_IE_Bit_State(ENABLE); //Enable interrupt
Set_ScanTimer_ON_Bit_State(ENABLE); //Run timer
} // end if(EmTouchDataReady)
} //end while (1)
} // end main()
int main(void)
{
#if defined( DUMP_DIAGNOSTICS_VIA_UART )
char ButtonMeasString[133];
# if defined( UART_DUMP_RAW_COUNTS ) || \
defined( UART_DUMP_ALL_COUNTS )
UINT16 iHF_Read;
# endif//defined( UART_DUMP_RAW_COUNTS )...
#endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
UINT16 iButton;
UINT16 CurrentButtonStatus, LastButtonStatus, CurrentButtonAsserts = 0,
CurrentButtonMeasurements[MAX_ADC_CHANNELS],
CurrentAveragedMeasurements[MAX_ADC_CHANNELS];
UINT16 CurrentWeights[MAX_ADC_CHANNELS];
UINT16 WeightSum,
RawSliderValue = 0,
WeightDeviation;
INT16 SliderValue = 0, CorrectedSliderValue = 0;
static INT16 LastSliderValue = 0;
DDPCONbits.JTAGEN = 0; // Disable JTAG
// Initalize global interrupt enable
INTEnableSystemMultiVectoredInt();
// Configure the device for maximum performance
// Given the options, this function will change the flash wait states, RAM
// wait state and enable prefetch cache but will not change the PBDIV.
// The PBDIV value is already set via the pragma FPBDIV option.
SYSTEMConfig(SYS_FREQ, SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);
#if defined( DUMP_DIAGNOSTICS_VIA_UART )
// Setup UART2 for transmission of button data.
// Taken from C:\Program Files\Microchip\mplabc32\v1.12\examples\plib_examples\uart\uart_basic
UARTConfigure(UART2, UART_ENABLE_PINS_TX_RX_ONLY);
UARTSetFifoMode(UART2, UART_INTERRUPT_ON_TX_NOT_FULL | UART_INTERRUPT_ON_RX_NOT_EMPTY);
UARTSetLineControl(UART2, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);
UARTSetDataRate(UART2, GetPeripheralClock(), 115200);
UARTEnable(UART2, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX | UART_TX));
#endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
// Setup data structures for using Direct Keys
mTouchCapApp_DirectKeys_Create();
/* This is mandatory function call to initilize physical layer.
Call this function before any application layer code. */
mTouchCapAPI_Init();
// Run "Chaser" LED sequence on slider LEDs to announce start of application
mTouchCapLED_PowerUpSequence();
#if defined( TICKLE_LED1 )
TRISFCLR = 1<<0;
#endif//defined( TICKLE_LED1 )
// Start button measurements
Set_ScanTimer_IE_Bit_State(ENABLE); //Enable interrupt
Set_ScanTimer_ON_Bit_State(ENABLE); //Run timer
#if defined( TICKLE_LED1 )
TRISFCLR = 1<<0; // Use pin 5 on J2 (RF0)
#endif// defined( TICKLE_LED1 )
// Setup for detection/interpretation
LastButtonStatus = 0;
while(1)
{
if(EmTouchDataReady == 1) //This flag is set by Timer ISR when all channels have been read
{
// Calculate new button values and return the measurement updates
mTouchCapPhy_UpdateData(CurrentButtonMeasurements,
CurrentAveragedMeasurements,
CurrentWeights,
TRUE, FILTER_METHOD_USECHANNEL);
// Update button and LED status and return button status for use with mTouch GUI on PC
CurrentButtonStatus = mTouchCapApp_DirectKeys_Demo();
// Check for button asserts: If buttons were pressed before, but none pressed now
if ( LastButtonStatus > 0 && CurrentButtonStatus == 0 )
{
CurrentButtonAsserts = LastButtonStatus; //Buttons have fired.
}
else
{ // Commented out to provide memory of last button asserted.
//ButtonAsserts = 0;
}
if ( CurrentButtonStatus > 0 ) // Something is happening on the buttons
{
// Calculate slider value for buttons as weighted average of weight deviation from max
WeightSum = 0;
RawSliderValue = 0;
for ( iButton = 0; iButton < NUM_DIRECT_KEYS ; iButton++ )
{
WeightDeviation = 256 - CurrentWeights[iButton];
WeightSum += WeightDeviation;
RawSliderValue += WeightDeviation*(iButton+1);
}
RawSliderValue = (256*(RawSliderValue/NUM_DIRECT_KEYS))/WeightSum;
CorrectedSliderValue = NUM_DIRECT_KEYS*((INT16)RawSliderValue-(256/NUM_DIRECT_KEYS))/(NUM_DIRECT_KEYS-1); // Correct for 1st button
CorrectedSliderValue = (CorrectedSliderValue < 0 ) ? 0 : CorrectedSliderValue;
CorrectedSliderValue = (CorrectedSliderValue > 256) ? 256 : CorrectedSliderValue;
}
else // Nothing is happening, put slider to sleep
{
RawSliderValue = 0;
CorrectedSliderValue = 0;
}
SliderValue = ( CorrectedSliderValue + ((1<<2) - 1)*LastSliderValue )>>2;
LastSliderValue = SliderValue;
# if defined( UART_DUMP_RAW_COUNTS )
for ( iHF_Read = 0; iHF_Read < NUM_HF_READS; iHF_Read++ )
# elif defined( UART_DUMP_ALL_COUNTS )
for ( iHF_Read = 0; iHF_Read < 3*NUM_HF_READS; iHF_Read++ )
# endif
# if defined( UART_DUMP_RAW_COUNTS ) || defined( UART_DUMP_ALL_COUNTS )
{
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurRawData[iHF_Read][0],CurRawData[iHF_Read][1],CurRawData[iHF_Read][2],CurRawData[iHF_Read][3],
CurRawData[iHF_Read][4],CurRawData[iHF_Read][5],CurRawData[iHF_Read][6],CurRawData[iHF_Read][7],
0,0,0,0,
iHF_Read+1);
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
}
# endif
# if defined( DUMP_DIAGNOSTICS_VIA_UART )
sprintf(ButtonMeasString,
"%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d,%05d,"
"%05d,%05d,%05d\r\n",
CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
CurrentButtonMeasurements[0],
CurrentButtonMeasurements[1],
CurrentButtonMeasurements[2],
CurrentButtonMeasurements[3],
CurrentButtonMeasurements[4],
CurrentButtonMeasurements[5],
CurrentButtonMeasurements[6],
CurrentButtonMeasurements[7],
RawSliderValue, CorrectedSliderValue, SliderValue);
SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
// Diagnostics for Buttons 1-6, with current and averaged button voltages
// sprintf( ButtonMeasString,
// "%05d,%05d,%05d,"
// "%05d,%05d,%05d,%05d,"
// "%05d,%05d,%05d,%05d,"
// "%05d,%05d,%05d,%05d"
// "\r\n",
// CurrentButtonStatus, CurrentButtonAsserts, SliderValue,
// CurrentButtonMeasurements[0],CurrentAveragedMeasurements[0],
// CurrentButtonMeasurements[1],CurrentAveragedMeasurements[1],
// CurrentButtonMeasurements[2],CurrentAveragedMeasurements[2],
// CurrentButtonMeasurements[3],CurrentAveragedMeasurements[3],
// CurrentButtonMeasurements[4],CurrentAveragedMeasurements[4],
// CurrentButtonMeasurements[5],CurrentAveragedMeasurements[5]);
// SendDataBuffer(ButtonMeasString, strlen(ButtonMeasString) );
# endif//defined( DUMP_DIAGNOSTICS_VIA_UART )
LastButtonStatus = CurrentButtonStatus; //Remember button status
EmTouchDataReady = 0; //clear flag
Set_ScanTimer_IE_Bit_State(ENABLE); //Enable interrupt
Set_ScanTimer_ON_Bit_State(ENABLE); //Run timer
} // end if(EmTouchDataReady)
} //end while (1)