Update platformio.ini

- Pin ststm32 to 8.1.x versions for this branch
- Update build targets, add bed targets for melzi board

platformio.ini

@@ -22,10 +22,21 @@ include_dir  = Marlin
 
 # KAD: supported environments, choose that you need:
 #
+# Stock, Melzi clone board, 12V PSU
+#
 # anycubic_mega_zero_mbl                     Highly recommended configuration. Manual Mesh Bed Leveling
 # anycubic_mega_zero                         Simple menus, no advanced bed leveling
-# anycubic_mega_zero_bl_zmin                 Automatic bed leveling, BLTouch is connected to PIN27 (Servo) and Z min stop
 # anycubic_mega_zero_bl_a2                   Automatic bed leveling, BLTouch is connected to PIN27 (Servo) and EXT-A2
+# anycubic_mega_zero_bl_zmin                 Automatic bed leveling, BLTouch is connected to PIN27 (Servo) and Z min stop
+# anycubic_mega_zero_bl_zmin_fs              Same as anycubic_mega_zero_bl_zmin, With simple filament sensor connected to EXT-A2. Watch out for pinout!
+# anycubic_mega_zero_bl_zmin_sfs             Same as anycubic_mega_zero_bl_zmin, With BTT Smart filament sensor connected to EXT-A2. Watch out for pinout!
+# anycubic_mega_zero_bed                     Same as anycubic_mega_zero, with heated bed
+# anycubic_mega_zero_bed_mbl                 Same as anycubic_mega_zero_mbl, with heated bed
+# anycubic_mega_zero_bed_bl_a2               Same as anycubic_mega_zero_bl_a2, with heated bed
+# anycubic_mega_zero_bed_bl_zmin             Same as anycubic_mega_zero_bl_zmin, with heated bed
+#
+# BigTreeTech SKR mini MZ 1.0 or SKR mini E3 2.0, 12V PSU.
+#
 # anycubic_mega_zero_btt                     SKR mini E3/MZ, Manual Mesh Bed Leveling
 # anycubic_mega_zero_btt_bl                  SKR mini E3/MZ, Automatic bed leveling, BLTouch is connected to PROBE port
 # anycubic_mega_zero_btt_bl_zmin             SKR mini E3/MZ, Automatic bed leveling, BLTouch is connected to PROBE port and Z min stop
@@ -41,7 +52,29 @@ include_dir  = Marlin
 #default_envs = anycubic_mega_zero_mbl
 
 # All Anycubic Mega Zero configs
-default_envs = anycubic_mega_zero, anycubic_mega_zero_mbl, anycubic_mega_zero_bl_a2, anycubic_mega_zero_bl_zmin, anycubic_mega_zero_btt, anycubic_mega_zero_btt_nano, anycubic_mega_zero_btt_bed, anycubic_mega_zero_btt_bl, anycubic_mega_zero_btt_bl_zmin, anycubic_mega_zero_btt_bed_bl, anycubic_mega_zero_btt_bed_bl_zmin, anycubic_mega_zero_btt_nano_bed, anycubic_mega_zero_btt_nano_bl, anycubic_mega_zero_btt_nano_bl_zmin, anycubic_mega_zero_btt_nano_bed_bl, anycubic_mega_zero_btt_nano_bed_bl_zmin, anycubic_mega_zero_bl_zmin_sfs, anycubic_mega_zero_bl_zmin_fs, anycubic_mega_zero_btt_nano_bl_e0fan
+default_envs =  anycubic_mega_zero
+                anycubic_mega_zero_mbl
+                anycubic_mega_zero_bl_a2
+                anycubic_mega_zero_bl_zmin
+                anycubic_mega_zero_bl_zmin_sfs
+                anycubic_mega_zero_bl_zmin_fs
+                anycubic_mega_zero_bed
+                anycubic_mega_zero_bed_mbl
+                anycubic_mega_zero_bed_bl_a2
+                anycubic_mega_zero_bed_bl_zmin
+                anycubic_mega_zero_btt
+                anycubic_mega_zero_btt_nano
+                anycubic_mega_zero_btt_bed
+                anycubic_mega_zero_btt_bl
+                anycubic_mega_zero_btt_bl_zmin
+                anycubic_mega_zero_btt_bed_bl
+                anycubic_mega_zero_btt_bed_bl_zmin
+                anycubic_mega_zero_btt_nano_bed
+                anycubic_mega_zero_btt_nano_bl
+                anycubic_mega_zero_btt_nano_bl_zmin
+                anycubic_mega_zero_btt_nano_bed_bl
+                anycubic_mega_zero_btt_nano_bed_bl_zmin
+                anycubic_mega_zero_btt_nano_bl_e0fan
 
 #
 # The 'common' values are used for most Marlin builds
@@ -1442,6 +1475,23 @@ extends       = env:anycubic_mega_zero_bl_a2
 build_flags   = ${env:anycubic_mega_zero_bl_a2.build_flags}
                 -DZ_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
 
+#
+# Anycubic Mega Zero Melzi clone, minimal config.
+#
+[env:anycubic_mega_zero_bed]
+extends       = env:anycubic_mega_zero
+build_flags   = ${env:anycubic_mega_zero.build_flags} -ffast-math
+                -DKAD_MELZI_BED
+
+#
+# Anycubic Mega Zero Melzi clone, standard config with Mesh Bed Leveling
+#
+[env:anycubic_mega_zero_bed_mbl]
+extends       = env:anycubic_mega_zero_mbl
+build_flags   = ${env:anycubic_mega_zero_mbl.build_flags}
+                -fno-tree-scev-cprop -fno-split-wide-types -Wl,--relax -mcall-prologues -finline-limit=3
+                -DKAD_MELZI_BED
+
 #
 # Anycubic Mega Zero Melzi clone, BLTouch config, Heated BED
 # PIN27 + EXT-A2 are used to connect probe.
@@ -1484,7 +1534,7 @@ build_flags   = ${env:anycubic_mega_zero_bl_zmin.build_flags}
 #
 [env:anycubic_mega_zero_btt]
 #platform                   = ${common_stm32f1.platform}
-platform                   = ststm32
+platform                   = ststm32@~8.1
 board_build.core           = maple
 extends                    = env:STM32F103RC_btt
 custom_marlin.NEOPIXEL_LED = Adafruit NeoPixel=https://github.com/ccccmagicboy/Adafruit_NeoPixel#meeb_3dp_use