fix: add connect-under-reset to flash.sh, so now all stm32g0 flashes are successful

Author: PonomarevDA

Makefile

@@ -99,7 +99,7 @@ tests:
 	${ROOT_DIR}/scripts/tests.sh
 
 upload:
-	LATEST_TARGET=$$(ls -td ${BUILD_DIR}/release/*.bin | head -1) && ./scripts/tools/stm32/flash.sh $$LATEST_TARGET
+	LATEST_TARGET=$$(ls -td ${BUILD_DIR}/release/*.bin | head -1) && ./scripts/flash.sh $$LATEST_TARGET
 
 SOCKETCAN_URL:=https://gist.githubusercontent.com/PonomarevDA/6ecc8fc340e4c50619c1e5dfcedc37b2/raw/2db6d1626a9ada543602ff0a52b48fecb94e6e07/socketcan.sh
 SOCKETCAN_EXECUTABLE:=build/tools/socketcan-v1.0.2.sh

docs/issues.md

@@ -4,3 +4,10 @@
 - affected versions: [v1.4.0, v1.5.0]
 - introduced by: `b65b63c` (`pwm: introduce pwm router and refactor pwm frontends`, 2025-12-08)
 - on test: `Tests/test_issue_0001_pwm_same_channel_apply.py`
+
+## ISSUE-0002
+- affected versions: [v3 introduction, v1.6.0)
+- introduced by: STM32G0 (Mini v3) support
+- symptoms: stm32g0 flashing fails every second attempt with `st-flash ... Flash programming error: 0x00000080`
+- root cause: flashing without connect-under-reset; target may be running IWDG and reset during programming
+- fixed in: v1.6.0 by using `--connect-under-reset` in `scripts/flash.sh`

scripts/flash.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+# https://gist.github.com/PonomarevDA/829961851abeca5c51154a0882a625fa
+# This software is distributed under the terms of the MIT License.
+# Copyright (c) 2023-2026 Dmitry Ponomarev.
+# Author: Dmitry Ponomarev <ponomarevda96@gmail.com>
+
+SCRIPT_NAME="flash.sh"
+VERSION="v1.1.0"
+
+BINARY_FILE=$1
+
+RED='\033[0;31m'
+NC='\033[0m'
+if [ -z "$BINARY_FILE" ]; then
+    echo -e "${RED}${SCRIPT_NAME} ${VERSION} error on line $LINENO: expected an argument!${NC}"
+    exit
+elif [ ! -f "$BINARY_FILE" ]; then
+    echo -e "${RED}${SCRIPT_NAME} ${VERSION} error on line $LINENO: specified file $BINARY_FILE is not exist!${NC}"
+    exit
+elif [[ ! $BINARY_FILE == *.bin ]]; then
+    echo -e "${RED}${SCRIPT_NAME} ${VERSION} error on line $LINENO: speficied file must have .bin extension!${NC}"
+    exit
+fi
+
+for attempt in {1..25}; do
+    echo ""
+    echo "${SCRIPT_NAME} ${VERSION}: attempt $attempt. Trying to load the firmware..."
+    echo -en "\007"
+
+    output=$(st-info --probe)
+
+    is_programmer_not_found=$(echo "$output" | grep "Found 0 stlink programmers")
+    if [ ! -z "$is_programmer_not_found" ]; then
+        echo "${SCRIPT_NAME} ${VERSION}: stlink programmer not found. Please connect it to your USB port!"
+        sleep 2
+        continue
+    fi
+
+    is_device_not_found=$(echo "$output" | grep "unknown device")
+    if [ ! -z "$is_device_not_found" ]; then
+        echo "${SCRIPT_NAME} ${VERSION}: STM32 not found. Please connect it to the stlink programmer!"
+        sleep 2
+        continue
+    fi
+
+    # stm32f103 has a wrong flash size. It says 64 KBytes, but it is actually 128 KBytes!
+    # Medium-density for old versions of st-link, MD for the newer versions of st-link
+    is_stm32f103=$(echo "$output" | grep "F1xx Medium-density\|STM32F1xx_MD")
+    if [ ! -z "$is_stm32f103" ]; then
+        EXPLICIT_FLASH_SIZE="--flash=0x00020000"
+    fi
+
+    output=$(st-flash $EXPLICIT_FLASH_SIZE --connect-under-reset --reset write $BINARY_FILE 0x8000000 | tee /dev/tty)
+    compare_res=$(echo "$output" | grep "pages written")
+    if [ -z "$compare_res" ]; then
+        sleep 2
+    else
+        echo "${SCRIPT_NAME} ${VERSION}: done"
+        for attempt in {1..15}; do
+            sleep 0.1
+            echo -en "\007"
+        done
+        exit
+    fi
+done
+
+for attempt in {1..15}; do
+    sleep 0.1
+    echo -en "\007"
+done