set pwm resolution to 16 bit

arduino/common/include/Arduino_Due_pinout.h

@@ -37,4 +37,4 @@ const int pin_lcd_d5         = 28;
 const int pin_lcd_d6         = 30;
 const int pin_lcd_d7         = 32;
 
-const int pwm_resolution = 8; // 8 bit resolution; up to 12 possible
\ No newline at end of file
+const int pwm_resolution = 12; // 8 bit resolution; up to 12 possible
\ No newline at end of file

arduino/common/include/huzzah32_pinout.h

@@ -41,5 +41,5 @@ const int pin_spare_2       = 23; // I2C SCL
 // PWM channels
 const int pwm_chan_inhale = 0;
 const int pwm_chan_exhale = 1;
-const int pwm_resolution = 8; // 8 bit resolution; up to 16 possible
+const int pwm_resolution = 16; // 8 bit resolution; up to 16 possible
 const int pwm_frequency  = 900; // frequency in Hz
\ No newline at end of file

arduino/common/include/nodemcu_32s_pinout.h

@@ -43,5 +43,5 @@ const int pin_sda = 22;
 // PWM channels
 const int pwm_chan_inhale = 0;
 const int pwm_chan_exhale = 1;
-const int pwm_resolution = 8; // 8 bit resolution; up to 16 possible
+const int pwm_resolution = 16; // 8 bit resolution; up to 16 possible
 const int pwm_frequency  = 900; // frequency in Hz

arduino/hev_prototype_v1/src/ValvesController.cpp

@@ -46,23 +46,23 @@ ValvesController::ValvesController()
 ValvesController::~ValvesController()
 { ; }
 
-int ValvesController::calcValveDutyCycle(int pwm_resolution, float frac_open)
+uint32_t ValvesController::calcValveDutyCycle(uint32_t pwm_resolution, float frac_open)
 {
-    // Here the duty cycle is an integer in the range of the PWM resolution
+    // Here the duty cycle is an uint32_teger in the range of the PWM resolution
     // - for 8 bit, we have range 0-255
     // => duty_cycle = frac_open * 255
     // there's a hard limit set by MAX_VALVE_FRAC_OPEN
-    int range_upper_val = pow(2, pwm_resolution) - 1;
+    uint32_t range_upper_val = pow(2, pwm_resolution) - 1;
     if (frac_open > MAX_VALVE_FRAC_OPEN) 
-        return (int)(range_upper_val * MAX_VALVE_FRAC_OPEN);
-    return (int)(range_upper_val  * frac_open);
+        return (uint32_t)(range_upper_val * MAX_VALVE_FRAC_OPEN);
+    return (uint32_t)(range_upper_val  * frac_open);
 }
 
 void ValvesController::setPWMValve(int pin, float frac_open)
 {
 
 #ifdef CHIP_ESP32
-    int duty_cycle = calcValveDutyCycle(pwm_resolution, frac_open);
+    uint32_t duty_cycle = calcValveDutyCycle(pwm_resolution, frac_open);
     int chan = _pin_to_chan[pin];
     //if (pin == pin_valve_exhale)
     //    chan = pwm_chan_exhale;

arduino/hev_prototype_v1/src/ValvesController.h

@@ -32,7 +32,7 @@ public:
                    uint8_t vexhale, bool vpurge);
     void getValves(bool &vin_air, bool &vin_o2, uint8_t &vinhale,
                    uint8_t &vexhale, bool &vpurge);
-    int calcValveDutyCycle(int pwm_resolution, float frac_open);
+    uint32_t calcValveDutyCycle(uint32_t pwm_resolution, float frac_open);
     uint8_t getValveInhalePercent();
     uint8_t getValveExhalePercent();
     uint8_t valveAirInEnabled();