Get bare ATtiny85 process working

wuddadoozy

1. Lots of issues despite Digispark, which uses
   10mhz attiny85 in SMD format, working fine.
2. Tiny AVR Programmer wasn't responsive and no
   blinking lights anywhere, even though
   multimeter confirmed chip was getting power.
   Trying the actual Damellis/ATtiny board
   Sparkfun recommends in the hookup guide seemed
   to get it working. Able to upload blink
3. Uploaded game code and looked like it was
   blinking at about the same rate as blink
   example. Why?
4. On top of that, silent speaker output. Tried
   386 and different pins. Turns out the "ATtiny"
   core doesn't have tone() implemented, just
   fails silently. Switched back to the
   "SpenceKonde/ATTinyCore" I had originally...
5. Oh! ATTinyCore has lots of unfamiliar options,
   and that's why I couldn't get it working
   originally. It turns out I also had the wrong
   programmer selected. Needed to be "USBtinyISP
   (ATTinyCore) SLOW, for new or 1MHz parts".
   TODO: understand the difference
6. Once ATTinyCore started uploading, timing was
   super duper slow. Options were guess-and-check
   to dial in, exacerbated by the IDE's
   unquittable, long failure cycle. 1mhz is good.
   8 and 16mhz were too slow. TODO: understand,
   check if frequencies are the same as arduboy
7. Final gotcha was getting CLI to work instead of
   the IDE. Seems like arduino-cli doesn't
   support the Tiny AVR Programmer, which doesn't
   use a dedicated port? My solution was to copy
   the avrdude stuff the Scout burner used. There
   may be a better workardound mentioned here:
   https://forum.arduino.cc/t/how-install-attiny-cores-for-arduino-cli/690928/2

In summary, combination issue of programmer
unfamiliarity and inconsistent tone() support
across core libraries.

Other notes:

- The author suggests using pin 4 for speaker for
  better tone() performance. Doesn't seem to make
  a discernible difference in my tests but there's
  no harm in switching.
- Pullups were indeed not necessary. The chip's
  on-board pulls work just fine. Must've been a
  breadboard/board problem.

Author: rocktronica

.gitignore

@@ -2,4 +2,6 @@ build/
 local/
 imgui.ini
 .vscode/
-kicad/*-backups/
+
+kicad/*-backups/
+kicad/#auto_saved_files#

arduino/higher_lower/common.h

@@ -1,9 +1,9 @@
 #ifdef __AVR_ATtiny85__
-#define SPKR_PIN 0
+#define SPKR_PIN 4
 #define LED_PIN 1
 #define UP_BUTTON 2
 #define DOWN_BUTTON 3
-#define SKIP_BUTTON 4
+#define SKIP_BUTTON 0
 #else
 #define SPKR_PIN 5
 #define LED_PIN 9

arduino/higher_lower/higher_lower.ino

@@ -84,7 +84,6 @@ void increment() { index = constrain(index + 1, 0, TONES_COUNT - 1); }
 
 void handleGuess(bool success) {
   if (success) {
-    // TODO: round ending prematurely (hardware only?)
     if (index == TONES_COUNT - 1) {
       playSuccessSound(currentRound + 1);
       delay(NEW_ROUND_PAUSE);

arduino/higher_lower/interface.h

@@ -6,9 +6,6 @@ void setupInterface() {
   pinMode(LED_PIN, OUTPUT);
   digitalWrite(LED_PIN, LOW);
 
-  // ATtiny85 says it has pullups but in practice may not?
-  // Seems like it might be a digispark/breadboard issue.
-  // TODO: Try different breadboard. Try bare ATtiny85.
   pinMode(UP_BUTTON, INPUT_PULLUP);
   pinMode(DOWN_BUTTON, INPUT_PULLUP);
   pinMode(SKIP_BUTTON, INPUT_PULLUP);

kicad/higher_lower.kicad_sch

@@ -507,7 +507,7 @@
 
   (no_connect (at 152.4 101.6) (uuid 803a6ac3-81da-4e1b-a625-4e5e5497c2ce))
 
-  (wire (pts (xy 184.15 113.03) (xy 184.15 114.935))
+  (wire (pts (xy 191.135 113.03) (xy 191.135 114.935))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 07560b1f-66f2-4410-a3ae-2efec6e686c0)
   )
@@ -527,22 +527,18 @@
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 1ec5cab1-8dc6-49cd-a7ce-c0e2c3830170)
   )
-  (wire (pts (xy 124.46 111.76) (xy 124.46 114.935))
+  (wire (pts (xy 191.135 103.505) (xy 196.85 103.505))
     (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 25b849f2-a026-4dff-9231-d914bd821356)
+    (uuid 22ee8ef8-f52a-45ab-becc-c51d7fbb514a)
   )
-  (wire (pts (xy 184.15 92.075) (xy 188.595 92.075))
+  (wire (pts (xy 124.46 111.76) (xy 124.46 114.935))
     (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 49e2e0d0-6448-49d1-a820-16d97efaf3c4)
+    (uuid 25b849f2-a026-4dff-9231-d914bd821356)
   )
-  (wire (pts (xy 184.15 101.6) (xy 184.15 103.505))
+  (wire (pts (xy 191.135 101.6) (xy 191.135 103.505))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 4ac7d5d2-31a8-43d3-9e58-aa7cecf03d51)
   )
-  (wire (pts (xy 193.675 92.075) (xy 196.85 92.075))
-    (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 4dd54627-dfcb-4cc1-94cf-f232ee892108)
-  )
   (wire (pts (xy 219.71 66.675) (xy 219.71 64.77))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 50253220-63c0-4df2-87e1-b759d535f6c0)
@@ -551,18 +547,10 @@
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 6a1eb119-741e-4821-9067-21871543ce75)
   )
-  (wire (pts (xy 193.675 103.505) (xy 196.85 103.505))
-    (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 8ea07948-77b4-4e68-9033-48179b871603)
-  )
   (wire (pts (xy 219.71 64.77) (xy 210.185 64.77))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 90ecf332-a0bf-4e40-af08-7106a484ee72)
   )
-  (wire (pts (xy 184.15 103.505) (xy 188.595 103.505))
-    (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 96c44b97-186d-4195-bd78-e1a19bdf0ca1)
-  )
   (wire (pts (xy 198.755 64.77) (xy 205.105 64.77))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 9cdd89f3-a4b9-4830-a0b5-414d8dd774b2)
@@ -571,11 +559,7 @@
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid a0067bc2-0f18-43f0-a5b9-f529af71f014)
   )
-  (wire (pts (xy 193.675 114.935) (xy 196.85 114.935))
-    (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid a487e012-1e00-4136-ab9a-ac674e4ebca5)
-  )
-  (wire (pts (xy 184.15 90.17) (xy 184.15 92.075))
+  (wire (pts (xy 191.135 90.17) (xy 191.135 92.075))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid ac59ceb1-9613-45b9-a7a2-1dc464fc8d48)
   )
@@ -603,14 +587,18 @@
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid d10fed4b-9a5f-462f-82e5-322cb681a193)
   )
-  (wire (pts (xy 184.15 114.935) (xy 188.595 114.935))
+  (wire (pts (xy 191.135 92.075) (xy 196.85 92.075))
     (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid e78e9404-d170-4e3d-9ed2-d5cb6020d102)
+    (uuid e15dbd82-92e0-4f2b-8b78-a1bce3181419)
   )
   (wire (pts (xy 139.7 91.44) (xy 152.4 91.44))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid f0a09528-957b-496e-b2b2-5b2e4ef534c5)
   )
+  (wire (pts (xy 191.135 114.935) (xy 196.85 114.935))
+    (stroke (width 0) (type default) (color 0 0 0 0))
+    (uuid f4123535-8722-4c87-8b4b-05782cbf9e36)
+  )
   (wire (pts (xy 207.01 114.935) (xy 210.82 114.935))
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid f8c2d073-a162-46b7-845d-da0d914f87e4)
@@ -624,10 +612,6 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 1131aedc-bdf4-4821-bf60-92cf6c7d3fda)
   )
-  (text "TODO: ditch pull-ups?" (at 189.865 87.63 0)
-    (effects (font (size 1.27 1.27)) (justify left bottom))
-    (uuid bbbf04a5-3880-4668-8200-87e9e298f199)
-  )
   (text "TODO: ditch" (at 208.915 120.015 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid f7e45f83-0aa5-41be-89be-1f5fee850f46)
@@ -689,17 +673,17 @@
       (effects (font (size 1.27 1.27)) (justify left) hide)
     )
   )
-  (global_label "OUTPUT" (shape input) (at 140.97 88.9 0) (fields_autoplaced)
+  (global_label "SKIP" (shape input) (at 140.97 88.9 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left))
     (uuid d7e48ff3-147e-4566-8af0-3deacbf76535)
-    (property "Intersheet References" "${INTERSHEET_REFS}" (id 0) (at 150.5798 88.8206 0)
+    (property "Intersheet References" "${INTERSHEET_REFS}" (id 0) (at 147.7374 88.8206 0)
       (effects (font (size 1.27 1.27)) (justify left) hide)
     )
   )
-  (global_label "SKIP" (shape input) (at 140.97 99.06 0) (fields_autoplaced)
+  (global_label "OUTPUT" (shape input) (at 140.97 99.06 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left))
     (uuid f1695ae4-b795-49e8-824a-4ac5c8379df2)
-    (property "Intersheet References" "${INTERSHEET_REFS}" (id 0) (at 147.7374 98.9806 0)
+    (property "Intersheet References" "${INTERSHEET_REFS}" (id 0) (at 150.5798 98.9806 0)
       (effects (font (size 1.27 1.27)) (justify left) hide)
     )
   )
@@ -739,17 +723,17 @@
     (pin "1" (uuid b7cf9fe2-e3ec-4ae0-bebd-cf7e96f30085))
   )
 
-  (symbol (lib_id "power:VCC") (at 184.15 101.6 0) (unit 1)
+  (symbol (lib_id "power:VCC") (at 191.135 101.6 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid 1a4b987f-1438-498c-b297-956f8fc4560b)
-    (property "Reference" "#PWR08" (id 0) (at 184.15 105.41 0)
+    (property "Reference" "#PWR08" (id 0) (at 191.135 105.41 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "VCC" (id 1) (at 184.15 97.79 0))
-    (property "Footprint" "" (id 2) (at 184.15 101.6 0)
+    (property "Value" "VCC" (id 1) (at 191.135 97.79 0))
+    (property "Footprint" "" (id 2) (at 191.135 101.6 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (id 3) (at 184.15 101.6 0)
+    (property "Datasheet" "" (id 3) (at 191.135 101.6 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 960e8759-b27f-484b-876e-3ff034b27162))
@@ -861,36 +845,6 @@
     (pin "2" (uuid 72d964a1-319b-459f-bdf9-895f9d32cf8f))
   )
 
-  (symbol (lib_id "Device:R_Small_US") (at 191.135 92.075 270) (unit 1)
-    (in_bom yes) (on_board yes)
-    (uuid 79bfbe14-a298-49a3-af8d-2c4745d625ef)
-    (property "Reference" "R2" (id 0) (at 191.135 95.25 90))
-    (property "Value" "10k" (id 1) (at 191.135 97.79 90))
-    (property "Footprint" "" (id 2) (at 191.135 92.075 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "~" (id 3) (at 191.135 92.075 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "1" (uuid 75701bd8-7de1-49fe-a80f-06a036d326ad))
-    (pin "2" (uuid 4d68ba8b-b167-477c-86f2-c1a693bf5cb9))
-  )
-
-  (symbol (lib_id "Device:R_Small_US") (at 191.135 114.935 270) (unit 1)
-    (in_bom yes) (on_board yes)
-    (uuid 8156c135-b1d2-4bd5-8adf-080c2f73b8d5)
-    (property "Reference" "R4" (id 0) (at 191.135 118.11 90))
-    (property "Value" "10k" (id 1) (at 191.135 120.65 90))
-    (property "Footprint" "" (id 2) (at 191.135 114.935 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "~" (id 3) (at 191.135 114.935 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "1" (uuid 37d4713c-d829-47c7-9809-86256e2969f9))
-    (pin "2" (uuid a8b587a1-2f6e-4cdd-8acb-13e60b639b96))
-  )
-
   (symbol (lib_id "power:GND") (at 208.915 144.145 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid 8d28cc8d-0b90-4463-b6e2-6b5f52b486a0)
@@ -924,17 +878,17 @@
     (pin "2" (uuid 612a87b9-3353-4247-bb15-c64508fb662e))
   )
 
-  (symbol (lib_id "power:VCC") (at 184.15 113.03 0) (unit 1)
+  (symbol (lib_id "power:VCC") (at 191.135 113.03 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid 98ce1880-8f29-4dd9-8413-8c97fba3f6db)
-    (property "Reference" "#PWR09" (id 0) (at 184.15 116.84 0)
+    (property "Reference" "#PWR09" (id 0) (at 191.135 116.84 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "VCC" (id 1) (at 184.15 109.22 0))
-    (property "Footprint" "" (id 2) (at 184.15 113.03 0)
+    (property "Value" "VCC" (id 1) (at 191.135 109.22 0))
+    (property "Footprint" "" (id 2) (at 191.135 113.03 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (id 3) (at 184.15 113.03 0)
+    (property "Datasheet" "" (id 3) (at 191.135 113.03 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 848a05cf-9f2d-4924-8de5-2142bbaa275e))
@@ -987,21 +941,6 @@
     (pin "1" (uuid bf813ca6-c9b0-496b-a4b2-6cd15e7fa5b4))
   )
 
-  (symbol (lib_id "Device:R_Small_US") (at 191.135 103.505 270) (unit 1)
-    (in_bom yes) (on_board yes)
-    (uuid bfb5ec4d-55e7-4dbe-ae47-620294c06820)
-    (property "Reference" "R3" (id 0) (at 191.135 106.68 90))
-    (property "Value" "10k" (id 1) (at 191.135 109.22 90))
-    (property "Footprint" "" (id 2) (at 191.135 103.505 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "~" (id 3) (at 191.135 103.505 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "1" (uuid 7973fcb5-29bb-4147-a4ba-fabef29f8aa4))
-    (pin "2" (uuid e3020ed2-2f50-4016-bf3a-4c5ee3e0b539))
-  )
-
   (symbol (lib_id "power:GND") (at 82.55 75.565 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid d13700fa-0042-41b7-80bf-1ad40b704bab)
@@ -1064,17 +1003,17 @@
     (pin "2" (uuid f6d879b0-69f8-4777-b983-7f38d2f5a23d))
   )
 
-  (symbol (lib_id "power:VCC") (at 184.15 90.17 0) (unit 1)
+  (symbol (lib_id "power:VCC") (at 191.135 90.17 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid f11eb872-feaa-41e1-9691-c44eb79ea70e)
-    (property "Reference" "#PWR07" (id 0) (at 184.15 93.98 0)
+    (property "Reference" "#PWR07" (id 0) (at 191.135 93.98 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "VCC" (id 1) (at 184.15 86.36 0))
-    (property "Footprint" "" (id 2) (at 184.15 90.17 0)
+    (property "Value" "VCC" (id 1) (at 191.135 86.36 0))
+    (property "Footprint" "" (id 2) (at 191.135 90.17 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (id 3) (at 184.15 90.17 0)
+    (property "Datasheet" "" (id 3) (at 191.135 90.17 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid e5d2167d-3280-48c3-b510-422b5a4f7072))
@@ -1151,15 +1090,6 @@
     (path "/f5fcb4f8-422e-4c2e-bb1f-9689e74188c5"
       (reference "R1") (unit 1) (value "220") (footprint "")
     )
-    (path "/79bfbe14-a298-49a3-af8d-2c4745d625ef"
-      (reference "R2") (unit 1) (value "10k") (footprint "")
-    )
-    (path "/bfb5ec4d-55e7-4dbe-ae47-620294c06820"
-      (reference "R3") (unit 1) (value "10k") (footprint "")
-    )
-    (path "/8156c135-b1d2-4bd5-8adf-080c2f73b8d5"
-      (reference "R4") (unit 1) (value "10k") (footprint "")
-    )
     (path "/ee12aa8c-531a-4fb4-abd1-5e630092c7cd"
       (reference "SW1") (unit 1) (value "SW_SPST") (footprint "")
     )

run.sh

@@ -6,6 +6,10 @@
 set -o errexit
 set -o errtrace
 
+_packages="$HOME/Library/Arduino15/packages"
+avrdude="${_packages}/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude"
+avrdude_config="${_packages}/ATTinyCore/hardware/avr/1.5.2/avrdude.conf"
+
 ardens="/Applications/Ardens/Ardens.app/Contents/MacOS/Ardens"
 
 port="/dev/cu.usbmodem143101"
@@ -14,7 +18,7 @@ stub=$(ls arduino | xargs)
 input_path="$PWD/arduino/${stub}"
 
 arduboy_build_dir="$PWD/build/arduboy"
-digispark_build_dir="$PWD/build/digispark"
+attiny85_build_dir="$PWD/build/attiny85"
 
 function help() {
     echo "\
@@ -54,15 +58,14 @@ function compile_for_arduboy() {
     echo
 }
 
-function compile_for_digispark() {
-    echo "COMPILING FOR DIGISPARK"
+function compile_for_attiny85() {
+    echo "COMPILING FOR ATTINY85"
     echo
 
-    mkdir -pv "${digispark_build_dir}" >/dev/null
+    mkdir -pv "${attiny85_build_dir}" >/dev/null
     arduino-cli compile \
-        --fqbn "digistump:avr:digispark-tiny" \
-        --build-path="$digispark_build_dir" \
-        --build-property "compiler.cpp.extra_flags=-w" \
+        --fqbn "ATTinyCore:avr:attinyx5:clock=4internal" \
+        --build-path="$attiny85_build_dir" \
         "${input_path}"
 
     echo
@@ -72,16 +75,17 @@ function emulate() {
     $ardens file="${arduboy_build_dir}/${stub}.ino.hex"
 }
 
-function upload_to_digispark() {
+function upload_with_programmer() {
     echo "UPLOADING"
     echo
 
-    echo "If already plugged in, unplug/reset/de-breadboard digispark..."
-    echo
-
-    arduino-cli upload \
-        --fqbn "digistump:avr:digispark-tiny" \
-        --input-dir "${digispark_build_dir}"
+    $avrdude \
+        -C"$avrdude_config" \
+        -v \
+        -pattiny85 \
+        -cusbtiny \
+        -B8 \
+        -U"flash:w:$attiny85_build_dir/higher_lower.ino.hex:i"
 
     echo
 }
@@ -93,7 +97,7 @@ fi
 
 if [ "$1" == 'compile' ]; then
     compile_for_arduboy
-    compile_for_digispark
+    compile_for_attiny85
     exit
 fi
 
@@ -107,8 +111,8 @@ if [ "$1" == 'deploy' ]; then
         port="$3"
     fi
 
-    compile_for_digispark
-    upload_to_digispark
+    compile_for_attiny85
+    upload_with_programmer
 
     exit
 fi