From 2dad406f43c81c02787a88ce7d517a85450cc983 Mon Sep 17 00:00:00 2001
From: Spence Konde <spencekonde@gmail.com>
Date: Fri, 5 Apr 2024 13:58:28 -0400
Subject: [PATCH] Should fix #1078

---
 megaavr/cores/megatinycore/Arduino.h       | 31 +++++++++++++---------
 megaavr/cores/megatinycore/wiring_analog.c | 21 +++++++++------
 2 files changed, 31 insertions(+), 21 deletions(-)

diff --git a/megaavr/cores/megatinycore/Arduino.h b/megaavr/cores/megatinycore/Arduino.h
index 3fa1a724..7d3a6225 100644
--- a/megaavr/cores/megatinycore/Arduino.h
+++ b/megaavr/cores/megatinycore/Arduino.h
@@ -207,19 +207,24 @@
   #define ADC_ACC512S     badArg("Sign chopping is only supported on Ex-series")
   #define ADC_ACC1024S    badArg("Sign chopping is only supported on Ex-series")
 
-  #define LOW_LAT_ON      0x03 // deprecated
-  #define LOW_LAT_OFF     0x02 // deprecated
-  #define ADC_LOWLAT_ON   0x03
-  #define ADC_LOWLAT_OFF  0x02
-  #define PGA_KEEP_ON     0x08
-  #define PGA_AUTO_OFF    0x0C
-  #define PGA_OFF_ONCE    0x04
-  #define ADC_ENABLE      0x20
-  #define ADC_DISABLE     0x30
-  #define ADC_STANDBY_ON  0xC0
-  #define ADC_STANDBY_OFF 0x80
-
-
+  #define _PGA_CFG_MASK     0x03
+  #define _ADC_LOWLAT_CTRL  0x08
+  #define _ADC_LOWLAT_VAL   0x04
+  #define _ADC_ENABLE_VAl   0x10
+  #define _ADC_ENABLE_CTRL  0x20
+  #define _ADC_STANDBY_VAl  0X40
+  #define _ADC_STANDBY_CTRL 0x80
+  #define PGA_OFF_ONCE      0x01
+  #define PGA_KEEP_ON       0x02
+  #define PGA_AUTO_OFF      0x03
+  #define LOW_LAT_ON        0x0C // deprecated
+  #define LOW_LAT_OFF       0x08 // deprecated
+  #define ADC_LOWLAT_ON     0x0C
+  #define ADC_LOWLAT_OFF    0x08
+  #define ADC_ENABLE        0x20
+  #define ADC_DISABLE       0x30
+  #define ADC_STANDBY_ON    0xC0
+  #define ADC_STANDBY_OFF   0x80
 #endif
 
 /* Errors in analogReadEnh and analogReadDiff are large negative numbers,
diff --git a/megaavr/cores/megatinycore/wiring_analog.c b/megaavr/cores/megatinycore/wiring_analog.c
index 7d47caa9..55cb7bac 100644
--- a/megaavr/cores/megatinycore/wiring_analog.c
+++ b/megaavr/cores/megatinycore/wiring_analog.c
@@ -400,11 +400,15 @@ void DACReference(__attribute__ ((unused))uint8_t mode) {
     // 01 = Turn off PGA, settings unchanged. It will be enabled next time is requested, but will not automatically turn off.
     // 10 = Turn on PGA, and don't turn it off automatically.
     // 11 = turn off PGA now and automatically after each use
+    //
+    // (set rstby)(to this value)(set enable)(to this value),
+
+
     uint8_t temp = ADC0.CTRLA; //performance.
-    if (options & 0x02) {
+    if (options & _ADC_LOWLAT_CTRL) {
       ADC0.CTRLA = 0; // hopwfully workaround lowlat errata by ensuring that everything is turned off.
       // and configuring lowlat mode.
-      if (options & 0x01) {
+      if (options & _ADC_LOWLAT_VAL) {
         ADC0.CTRLA |=  ADC_LOWLAT_bm;
         temp |= ADC_LOWLAT_bm;
       } else {
@@ -412,24 +416,25 @@ void DACReference(__attribute__ ((unused))uint8_t mode) {
         temp &= ~ADC_LOWLAT_bm;
       }
     }
-    if (options & 0x20) {
-      if (options & 0x10) {
+    if (options & _ADC_ENABLE_CTRL) {
+      if (options & _ADC_ENABLE_VAL) {
         temp |= 1; // ADC on
       } else {
         temp &= 0xFE; // ADC off
       }
     }
-    if (options & 0x80) {
-      if (options & 0x40) {
+    if (options & _ADC_STANDBY_CTRL) {
+      if (options & _ADC_STANDBY_VAL) {
         temp |= 0x80; // run standby
       } else {
         temp &= 0x7F; // no run standby
       }
     }
     ADC0.CTRLA = temp; //now we apply enable and standby, and lowlat has been turned on, hopefully that's good enough for the errata.
-    if (options & 0x04) { // turn off PGA.
+    options &= _PGA_CFG_MASK;
+    if (options & 0x01) { // turn off PGA.
       ADC0.PGACTRL &= ~ADC_PGAEN_bm;
-      if (options & 0x08)  {
+      if (options & 0x02)  {
         _analog_options &= 0x7F;
       } else {
         _analog_options |= 0x80;