Add 'bootloadHID' flash target (#5587)

* Add 'bootloadHID' flash target

* Prep for flash target

* Add :flash support

* Align bootloader wait messages

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update template to suggest use of :flash

2 files changed, 20 insertions, 28 deletions

diff --git a/quantum/template/ps2avrgb/readme.md b/quantum/template/ps2avrgb/readme.md
index feec722a52..c01e7bca52 100644
--- a/quantum/template/ps2avrgb/readme.md
+++ b/quantum/template/ps2avrgb/readme.md
@@ -12,33 +12,10 @@ Make example for this keyboard (after setting up your build environment):
 
     make %KEYBOARD%:default
 
-Flashing
-
-ps2avr(GB) boards use an atmega32a microcontroller and a different bootloader. It is not flashable using the regular QMK methods. 
-
-Windows: 
-1. Download [HIDBootFlash](http://vusb.wikidot.com/project:hidbootflash).
-2. Place your keyboard into reset. 
-3. Press the `Find Device` button and ensure that your keyboard is found.
-4. Press the `Open .hex File` button and locate the `.hex` file you created.
-5. Press the `Flash Device` button and wait for the process to complete. 
-
-macOS:
-1. Install homebrew by typing the following:   
-    ```
-    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-    ```
-2. Install `crosspack-avr`.  
-    ```
-    brew cask install crosspack-avr
-    ```
-3. Install the following packages:
-    ```
-    brew install python
-    brew install pyusb
-    brew install --HEAD`https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
-
-4. Place your keyboard into reset. 
-5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file. 
+Flashing example for this keyboard ([after setting up the bootloadHID flashing environment](flashing_bootloadhid.md))
+
+    make %KEYBOARD%:default:flash
+
+**Reset Key**: Hold down the key located at *LOCATION*, commonly programmed as *KEY* while plugging in the keyboard.
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index e5443418b9..bdda14a070 100644
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -246,6 +246,19 @@ endef
 usbasp: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
 	$(call EXEC_USBASP)
 
+BOOTLOADHID_PROGRAMMER ?= bootloadHID
+
+define EXEC_BOOTLOADHID
+	# bootloadHid executable has no cross platform detect methods
+	# so keep running bootloadHid if the output contains "The specified device was not found"
+	until $(BOOTLOADHID_PROGRAMMER) -r $(BUILD_DIR)/$(TARGET).hex 2>&1 | tee /dev/stderr | grep -v "device was not found"; do\
+		echo "Error: Bootloader not found. Trying again in 5s." ;\
+		sleep 5 ;\
+	done
+endef
+
+bootloadHID: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
+	$(call EXEC_BOOTLOADHID)
 
 # Convert hex to bin.
 bin: $(BUILD_DIR)/$(TARGET).hex
@@ -331,6 +344,8 @@ else ifeq (dfu,$(findstring dfu,$(BOOTLOADER)))
 	$(call EXEC_DFU)
 else ifeq ($(strip $(BOOTLOADER)), USBasp)
 	$(call EXEC_USBASP)
+else ifeq ($(strip $(BOOTLOADER)), bootloadHID)
+	$(call EXEC_BOOTLOADHID)
 else
 	$(PRINT_OK); $(SILENT) || printf "&(MSG_FLASH_BOOTLOADER)"
 endif