UA1ZBE Custom Firmware v1.0

Features:
- VFO mode with direct frequency input
- POCSAG decoder (512/1200 baud) with BCH(31,21) correction
- Full-screen Spectrum analyzer
- FM Radio receiver
- RSSI signal indicator overlay
- Custom boot splash (UA1ZBE / POCSAG pager / build date)

Architecture:
- app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM)
- app/boot_splash.c — 2-second boot splash
- app/pocsag/ — POCSAG decoder + BCH correction
- app/display_rssi.c — RSSI indicator
- main.c — entry point with custom init
- syscalls.c — bare-metal _sbrk stub

Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra
Size: 57.9KB Flash / 3.6KB RAM

Controls:
- 0-9: Direct frequency input (VFO)
- SK2: POCSAG mode
- SK1: Spectrum analyzer
- 0: FM Radio
- EXIT: Return to VFO
- F/*: Toggle 512/1200 baud (in POCSAG)

external/printf/.travis.yml

@@ -0,0 +1,63 @@
+# Use a C++11 distro
+dist: trusty
+sudo: required
+
+# Enable C++ support
+language: cpp
+
+# Compiler selection
+compiler: gcc
+
+env:
+  global:
+    # coverity key
+    - secure: "NKZbBnMALGIIQJy/s2kc3EST/stw+gjhtrGq0jkbsWr7Wx3FH+lmLeHNsDXRnD1VbpG02c5YsLllqz9OVu+0yxWGepvKNmCz1cNITIALEHbrax8/Af9LzPRL/QZxS/Qe11sMuySp4X16mFBUyxMd/X+I9i96Xf1vKkZABklYD1Q="
+
+# addons
+addons:
+  apt:
+    packages:
+      - gcc-6
+      - g++-6
+    sources:
+      - ubuntu-toolchain-r-test
+
+  coverity_scan:
+    project:
+      name: "mpaland/printf"
+      description: "Tiny printf implementation"
+    notification_email: marco@paland.com
+    build_command_prepend: "make clean"
+    build_command: "make"
+    branch_pattern: master
+
+before_install:
+  # connect coverity
+  - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-
+
+# Active branches
+branches:
+  only:
+   - master
+
+script:
+  # Link gcc-6 and g++-6 to their standard commands
+  - sudo rm /usr/bin/gcc
+  - sudo rm /usr/bin/g++
+  - sudo ln -s /usr/bin/gcc-6 /usr/bin/gcc
+  - sudo ln -s /usr/bin/g++-6 /usr/bin/g++
+  # Export CC and CXX
+  - export CC=/usr/bin/gcc-6
+  - export CXX=/usr/bin/g++-6
+  # Check versions of gcc, g++
+  - gcc -v && g++ -v
+  # Run build commands
+  - make
+  # execute the text suite
+  - bin/test_suite -d yes
+  # coverall profiling
+  - tmp/cov/test_suite
+
+after_success:
+  ## Report to codecov
+  - bash <(curl -s https://codecov.io/bash)