first version of adc control over off time

Powercore-V2.0 Firmware/main.c

@@ -2,16 +2,22 @@
 #include "pico/stdlib.h"
 #include "pico/time.h"
 #include "hardware/pwm.h"
+#include "hardware/adc.h"
 
 #include "CC_Charger.h"
 #include "pulse_generator.h"
 
-//Pinout definitions
+// digital definitions
 #define CUT_nEN_PIN 0
 
+// analog definitions
+#define GPIO29_ADC3_PIN 29
+#define GPIO29_ADC3_CHANNEL 3
+
 //OUTPUT PULSE PARAMETERS (times in usecs)
 #define OUTPUT_ON_TIME 20
-#define OUTPUT_OFF_TIME 70
+#define OUTPUT_OFF_TIME_MIN 64
+#define OUTPUT_OFF_TIME_MAX 512
 #define ISO_PULSE false
 #define CAP_VOLTAGE_SETPOINT 70
 
@@ -21,6 +27,28 @@
 //Math stuff DO NOT EDIT
 #define CAP_VOLTAGE_PWM_LEVEL CAP_VOLTAGE_SETPOINT * 303 / 48
 
+// initiate GPIO pin 29, ADC channel 3
+void gpio29_adc3_init() {
+
+    // initialize ADC
+    adc_init();
+
+    // make sure GPIO is high-impedance, no pull-ups
+    adc_gpio_init(GPIO29_ADC3_PIN);
+
+}
+
+// read ADC value from GPIO pin 29 channel 3, and return the value as a 16-bit +integer
+uint16_t gpio29_adc3_read() {
+
+    // select ADC channel
+    adc_select_input(GPIO29_ADC3_CHANNEL);
+
+    // read ADC value
+    return adc_read();
+
+}
+
 bool cut_on_off_irq(repeating_timer_t *rt) {
 
     if(short_tripped) {
@@ -37,6 +65,10 @@ bool cut_on_off_irq(repeating_timer_t *rt) {
         if(!gpio_get(CUT_nEN_PIN) && !cutting_enabled) {
 
             cutting_enabled = true;
+
+            // read adc channel 3, and map value from OUTPUT_OFF_TIME_MIN to OUTPUT_OFF_TIME_MAX
+            uint16_t OUTPUT_OFF_TIME = gpio29_adc3_read() * (OUTPUT_OFF_TIME_MAX - OUTPUT_OFF_TIME_MIN) / 4095 + OUTPUT_OFF_TIME_MIN;
+
             begin_output_pulses(OUTPUT_ON_TIME, OUTPUT_OFF_TIME, ISO_PULSE);
 
         } else if(gpio_get(CUT_nEN_PIN)) { 
@@ -64,6 +96,8 @@ int main() {
 
     sleep_ms(1000);
 
+    gpio29_adc3_init();
+
     CC_Charger_init(CHARGER_CURRENT, CAP_VOLTAGE_PWM_LEVEL);                                //Setup the CC Charger Outputs
 
     pulse_generator_init(70);                                                               //Setup Pulse generator