From 61c1c733e9450f1a5d0a96b2450c89d8903ffe82 Mon Sep 17 00:00:00 2001
From: "Adrian A. Baumann" <ade@adebaumann.com>
Date: Thu, 21 May 2026 22:15:15 +0200
Subject: [PATCH] fix: replace sscanf %f with %s+atof for AVR compatibility in
 parsers

---
 Gaugecontroller/Gaugecontroller.ino | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Gaugecontroller/Gaugecontroller.ino b/Gaugecontroller/Gaugecontroller.ino
index ce1164a..d4e2bd2 100644
--- a/Gaugecontroller/Gaugecontroller.ino
+++ b/Gaugecontroller/Gaugecontroller.ino
@@ -453,8 +453,9 @@ bool parseSet(const String& line) {
 // Parses `SPEED <id> <speed>` and updates the max step rate.
 // Replies: `OK`, `ERR BAD_ID`, `ERR BAD_SPEED`.
 bool parseSpeed(const String& line) {
-  int id; float speed;
-  if (sscanf(line.c_str(), "SPEED %d %f", &id, &speed) == 2) {
+  int id; char token[20];
+  if (sscanf(line.c_str(), "SPEED %d %19s", &id, token) == 2) {
+    float speed = atof(token);
     if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID");    return true; }
     if (speed <= 0.0f)               { sendReply("ERR BAD_SPEED"); return true; }
     gauges[id].maxSpeed = speed;
@@ -467,8 +468,9 @@ bool parseSpeed(const String& line) {
 // Parses `ACCEL <id> <accel>` and updates the acceleration limit.
 // Replies: `OK`, `ERR BAD_ID`, `ERR BAD_ACCEL`.
 bool parseAccel(const String& line) {
-  int id; float accel;
-  if (sscanf(line.c_str(), "ACCEL %d %f", &id, &accel) == 2) {
+  int id; char token[20];
+  if (sscanf(line.c_str(), "ACCEL %d %19s", &id, token) == 2) {
+    float accel = atof(token);
     if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID");    return true; }
     if (accel <= 0.0f)               { sendReply("ERR BAD_ACCEL"); return true; }
     gauges[id].accel = accel;
@@ -545,9 +547,11 @@ bool parseHome(const String& line) {
 // Parses `SWEEP <id> <accel> <speed>` and enables or disables end-to-end motion.
 // Replies: `OK`, `ERR BAD_ID`.
 bool parseSweep(const String& line) {
-  int id; float accel, speed;
-  if (sscanf(line.c_str(), "SWEEP %d %f %f", &id, &accel, &speed) == 3) {
+  int id; char accelTok[20], speedTok[20];
+  if (sscanf(line.c_str(), "SWEEP %d %19s %19s", &id, accelTok, speedTok) == 3) {
     if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID"); return true; }
+    float accel = atof(accelTok);
+    float speed = atof(speedTok);
     Gauge& g = gauges[id];
     if (accel <= 0.0f || speed <= 0.0f) {
       g.sweepEnabled = false;