Declared new member functions ready(), start(), and clear()

ready() and start() are just the begin() function split into two pieces so you can setup the DMA and ADC without starting until later.

Author: jmdodd95682

src/AdvancedADC.h

@@ -55,6 +55,17 @@ class AdvancedADC {
             n_channels = n_pins;
             return begin(resolution, sample_rate, n_samples, n_buffers);
         }
+        void clear();  //clears any existing DMA buffers from read queue
+        int ready(uint32_t resolution, uint32_t sample_rate, size_t n_samples, size_t n_buffers);
+        int ready(uint32_t resolution, uint32_t sample_rate, size_t n_samples, size_t n_buffers, size_t n_pins, pin_size_t *pins) {
+            if (n_pins > AN_MAX_ADC_CHANNELS) n_pins = AN_MAX_ADC_CHANNELS;
+            for (size_t i = 0; i < n_pins; ++i) {
+                adc_pins[i] = analogPinToPinName(pins[i]);
+            }
+            n_channels = n_pins;
+            return ready(resolution, sample_rate, n_samples, n_buffers);
+        }
+        int start(uint32_t sample_rate);
         int stop();
 };