| 0,0 → 1,118 |
|---|
| #include <xc.h> |
| #include "defines.h" |
| #include "base_CPS.h" |
| |
| static CPS_DATA *cps_data_p; |
| |
| void CPS_Init(CPS_DATA* data) { |
| cps_data_p = data; |
| for (char i = 0; i < 4; i++) { |
| cps_data_p->btn_pressed[i] = 0; |
| cps_data_p->btn_last_value[i] = 0; |
| cps_data_p->btn_avg_value[i] = 0; |
| cps_data_p->btn_pct_value[i] = 0; |
| } |
| |
| /* Initialize port direction */ |
| CPS_0_TRIS = 1; |
| CPS_1_TRIS = 1; |
| |
| /* Initialize FVR for the upper threshold (Ref+) */ |
| FVRCONbits.CDAFVR = 0b01; // Gain of 1x (1.024V) |
| FVRCONbits.FVREN = 1; // Enable FVR module |
| |
| /* Initialize DAC for the lower threshold (Ref-) */ |
| DACCON0bits.DACEN = 0; // Disable DAC |
| DACCON0bits.DACLPS = 0; // Negative reference source selected |
| DACCON0bits.DACOE = 0; // Output not routed to DACOUT pin |
| DACCON0bits.DACPSS = 0b00; // Vdd used as positive source |
| // DACCON0bits.DACNSS = 0; // Vss used as negative source |
| DACCON1bits.DACR = 0b00000; // Voltage output set to 0 |
| |
| /* Initialize Timer 0 */ |
| OPTION_REGbits.TMR0CS = 0; // Clock source is FOSC/4 |
| OPTION_REGbits.PSA = 0; // Prescaler enabled |
| OPTION_REGbits.PS = 0b111; // Prescaler of 1:256 |
| |
| /* Initialize Timer 1 */ |
| T1CONbits.TMR1CS = 0b11; // Clock source is Capacitive Sensing Oscillator |
| T1CONbits.T1CKPS = 0b00; // 1:1 Prescale value |
| T1GCONbits.TMR1GE = 1; // Counting is controlled by the gate function |
| T1GCONbits.T1GPOL = 1; // Gate is active high |
| T1GCONbits.T1GTM = 1; // Gate toggle mode is enabled |
| T1GCONbits.T1GSPM = 0; // Gate single-pulse mode is disabled |
| T1GCONbits.T1GSS = 0b01; // Gate source is Timer 0 overflow |
| T1CONbits.TMR1ON = 1; // Enables timer 1 |
| |
| /* Initialize CPS Module */ |
| CPSCON0bits.CPSRM = 1; // DAC and FVR used for Vref- and Vref+ |
| CPSCON0bits.CPSRNG = 0b11; // Osc in high range (100uA) |
| CPSCON0bits.T0XCS = 0; // Timer 0 clock runs at FOSC/4 |
| CPSCON1bits.CPSCH = 0b00; // Channel 0 (CPS0) |
| cps_data_p->channel = 0; |
| CPSCON0bits.CPSON = 1; // CPS module is enabled |
| |
| /* Initialize timer interrupts and clear timers */ |
| INTCONbits.TMR0IE = 1; // Timer 0 interrupt enabled |
| PIE1bits.TMR1IE = 0; // Timer 1 interrupt disabled |
| CPS_Reset(); |
| } |
| |
| void CPS_Timer_0_Interrupt_Handler() { |
| unsigned int value = TMR1; |
| long percent; |
| |
| if (value < 10) { |
| return; |
| } |
| |
| // Calculate percentage change |
| percent = (long)cps_data_p->btn_avg_value[cps_data_p->channel]-(long)value; |
| if (percent < 0) |
| percent = 0; |
| else { |
| percent *= 100; |
| percent /= cps_data_p->btn_avg_value[cps_data_p->channel]; |
| } |
| |
| cps_data_p->btn_last_value[cps_data_p->channel] = value; |
| cps_data_p->btn_pct_value[cps_data_p->channel] = percent; |
| |
| if (percent < CPS_PCT_OFF) { |
| // Calculate average |
| cps_data_p->btn_avg_value[cps_data_p->channel] = |
| cps_data_p->btn_avg_value[cps_data_p->channel] + |
| ((long)value - (long)cps_data_p->btn_avg_value[cps_data_p->channel]) |
| /CPS_AVG_COUNT; |
| // Set flag to indicate that button is not pressed |
| cps_data_p->btn_pressed[cps_data_p->channel] = 0; |
| } else if (percent > CPS_PCT_ON) |
| // Set flag to indicate that button was pressed |
| cps_data_p->btn_pressed[cps_data_p->channel] = 1; |
| |
| cps_data_p->channel = cps_data_p->channel + 1; |
| if (cps_data_p->channel == CPS_NUM_CHANNELS) |
| cps_data_p->channel = 0; |
| |
| CPSCON1bits.CPSCH = cps_data_p->channel; |
| |
| CPS_Reset(); |
| } |
| |
| void CPS_Reset() { |
| TMR1 = 0; |
| TMR0 = 0; |
| } |
| |
| void CPS_Enable() { |
| INTCONbits.TMR0IE = 1; // Timer 0 interrupt enabled |
| T1CONbits.TMR1ON = 1; |
| CPSCON0bits.CPSON = 1; |
| CPS_Reset(); |
| } |
| |
| void CPS_Disable() { |
| INTCONbits.TMR0IE = 0; |
| CPSCON0bits.CPSON = 0; |
| T1CONbits.TMR1ON = 0; |
| } |