From 9af25c73d6474520b9d0cceecc06083aa082694f Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Fri, 26 Jul 2024 11:01:09 +0200
Subject: [PATCH] Refactor ADC MQ_SAMPLES saving code and RAM

---
 tasmota/tasmota_xsns_sensor/xsns_02_analog.ino | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tasmota/tasmota_xsns_sensor/xsns_02_analog.ino b/tasmota/tasmota_xsns_sensor/xsns_02_analog.ino
index 88928ab19..f085cdcc8 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_02_analog.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_02_analog.ino
@@ -163,6 +163,8 @@ struct {
 } Adcs;
 
 struct {
+//  float mq_samples[ANALOG_MQ_SAMPLES];
+  float *mq_samples;
   float temperature = 0;
   float current = 0;
   float energy = 0;
@@ -170,12 +172,11 @@ struct {
   uint32_t param2 = 0;
   int param3 = 0;
   int param4 = 0;
+  int indexOfPointer = -1;
   uint32_t previous_millis = 0;
   uint16_t last_value = 0;
   uint8_t type = 0;
   uint8_t pin = 0;
-  float mq_samples[ANALOG_MQ_SAMPLES];
-  int indexOfPointer = -1;
 } Adc[MAX_ADCS];
 
 bool adcAttachPin(uint8_t pin) {
@@ -261,6 +262,10 @@ void AdcAttach(uint32_t pin, uint8_t type) {
   if (Adcs.present == MAX_ADCS) { return; }
   Adc[Adcs.present].pin = pin;
   if (adcAttachPin(Adc[Adcs.present].pin)) {
+    if (ADC_MQ == type) {
+      Adc[Adcs.present].mq_samples = (float*)calloc(sizeof(float), ANALOG_MQ_SAMPLES);  // Need calloc to reset registers to 0/false
+      if (nullptr == Adc[Adcs.present].mq_samples) { return; }
+    }
     Adc[Adcs.present].type = type;
 //    analogSetPinAttenuation(Adc[Adcs.present].pin, ADC_11db);  // Default
     Adcs.present++;