Improved stm32 GPIO driver

Complete rewrite of the stm32 gpio driver using updated APIs.

Moves all GPIO related atoms from `platform_defaultatoms.{c,h}` into `gpio_driver.c`
Improved input validation.
Adds read support port driver.
Adds nif functions to support read and write.
Adds cmake configuration options to disable nifs and/or port driver when building the VM.

Closes atomvm#571
Addresses atomvm#894 on STM32 platform.

Signed-off-by: Winford <[email protected]>

Author: UncleGrumpy

CHANGELOG.md

@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added support for the OTP `socket` interface.
 - Enhancd performance of STM32 by enabling flash cache and i-cache with branch prediction.
 - Added cmake configuration option `AVM_CONFIG_REBOOT_ON_NOT_OK` for STM32
+- New gpio driver for STM32 with nif and port support for read and write functions.
 
 ## [0.6.0-alpha.1] - 2023-10-09
 

src/platforms/stm32/CMakeLists.txt

@@ -33,6 +33,8 @@ option(AVM_LOG_DISABLE "Disable log output" OFF)
 option(AVM_ENABLE_LOG_COLOR "Use color log output" OFF)
 option(AVM_ENABLE_LOG_LINES "Include source and line info for all enbled levels" OFF)
 option(AVM_CONFIG_REBOOT_ON_NOT_OK "Reboot when application exits with non 'ok' return" OFF)
+option(AVM_DISABLE_GPIO_NIFS "Disable GPIO nifs (input and output)" OFF)
+option(AVM_DISABLE_GPIO_PORT_DRIVER "Disable GPIO 'port' driver (input, output, and interrupts)" OFF)
 
 set(AVM_DISABLE_SMP ON FORCE)
 
@@ -64,6 +66,14 @@ if (AVM_ENABLE_LOG_LINES)
     add_compile_definitions(ENABLE_LOG_LINE_INFO)
 endif()
 
+# Configure Drivers
+if (AVM_DISABLE_GPIO_NIFS)
+    add_compile_definitions(AVM_DISABLE_GPIO_NIFS)
+endif()
+if (AVM_DISABLE_GPIO_PORT_DRIVER)
+    add_compile_definitions(AVM_DISABLE_GPIO_PORT_DRIVER)
+endif()
+
 # Include an error in case the user forgets to specify ARM as a toolchain
 if (NOT CMAKE_TOOLCHAIN_FILE)
     message(FATAL_ERROR "Cross compiling only. Please use -DCMAKE_TOOLCHAIN_FILE=cmake/arm-toolchain.cmake or use\

src/platforms/stm32/src/lib/CMakeLists.txt

@@ -23,16 +23,14 @@ project (libAtomVMPlatformSTM32)
 
 set(HEADER_FILES
     avm_log.h
-    gpiodriver.h
-    platform_defaultatoms.h
+    gpio_driver.h
     stm_sys.h
     ../../../../libAtomVM/platform_nifs.h
     ../../../../libAtomVM/sys.h
 )
 
 set(SOURCE_FILES
-    gpiodriver.c
-    platform_defaultatoms.c
+    gpio_driver.c
     platform_nifs.c
     sys.c
 )