Compile only selected PIO environment (#11519)

Marlin/src/HAL/HAL_AVR/HAL.h

@@ -34,7 +34,7 @@
 #include <avr/interrupt.h>
 #include <avr/io.h>
 
-#include "../HAL_SPI.h"
+#include "../shared/HAL_SPI.h"
 #include "fastio_AVR.h"
 #include "watchdog_AVR.h"
 #include "math_AVR.h"

Marlin/src/HAL/HAL_AVR/persistent_store_eeprom.cpp

@@ -25,7 +25,7 @@
 
 #if ENABLED(EEPROM_SETTINGS)
 
-#include "../persistent_store_api.h"
+#include "../shared/persistent_store_api.h"
 
 bool PersistentStore::access_start() { return true; }
 bool PersistentStore::access_finish() { return true; }

Marlin/src/HAL/HAL_AVR/persistent_store_impl.cpp

@@ -0,0 +1,51 @@
+#ifdef __AVR__
+
+#include "../shared/persistent_store_api.h"
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(EEPROM_SETTINGS)
+
+namespace HAL {
+namespace PersistentStore {
+
+bool access_start() { return true; }
+bool access_finish() { return true; }
+
+bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
+  while (size--) {
+    uint8_t * const p = (uint8_t * const)pos;
+    uint8_t v = *value;
+    // EEPROM has only ~100,000 write cycles,
+    // so only write bytes that have changed!
+    if (v != eeprom_read_byte(p)) {
+      eeprom_write_byte(p, v);
+      if (eeprom_read_byte(p) != v) {
+        SERIAL_ECHO_START();
+        SERIAL_ECHOLNPGM(MSG_ERR_EEPROM_WRITE);
+        return true;
+      }
+    }
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  };
+  return false;
+}
+
+bool read_data(int &pos, uint8_t* value, uint16_t size, uint16_t *crc, const bool writing/*=true*/) {
+  do {
+    uint8_t c = eeprom_read_byte((unsigned char*)pos);
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;  // always assume success for AVR's
+}
+
+}
+}
+
+#endif // EEPROM_SETTINGS
+#endif // __AVR__

Marlin/src/HAL/HAL_AVR/servo_AVR.cpp

@@ -60,8 +60,8 @@
 #include <avr/interrupt.h>
 #include <Arduino.h>
 
-#include "../servo.h"
-#include "../servo_private.h"
+#include "../shared/servo.h"
+#include "../shared/servo_private.h"
 
 static volatile int8_t Channel[_Nbr_16timers];              // counter for the servo being pulsed for each timer (or -1 if refresh interval)