build: Reorganize build rules.

4 files changed, 286 insertions, 0 deletions

diff --git a/build/env.py b/build/env.py
new file mode 100644
index 0000000..c43bb60
--- /dev/null
+++ b/build/env.py
@@ -0,0 +1,14 @@
+import os
+
+env = Environment(
+    ENV = os.environ,
+
+    toolpath = ['scons_tools'],
+    tools = [
+        'default',
+        'tool_selectmcu',
+        'tool_firmware',
+    ],
+)
+
+Return('env')
diff --git a/build/rules.py b/build/rules.py
new file mode 100644
index 0000000..80a4d10
--- /dev/null
+++ b/build/rules.py
@@ -0,0 +1,127 @@
+laks_dir = Dir('..')
+ld_dir = Dir('../ld_scripts')
+main_sconscript = File('../SConscript')
+
+def select_arm(env, family):
+	env.SetDefault(
+		TOOLCHAIN = 'arm-none-eabi-',
+	)
+	
+	if family == 'cortex-m4f':
+		family = 'cortex-m4'
+		has_mcu = True
+	else:
+		has_mcu = False
+	
+	env.Replace(
+		CC     = '${TOOLCHAIN}gcc',
+		CXX    = '${TOOLCHAIN}g++',
+		AS     = '${TOOLCHAIN}gcc',
+		LINK   = '${TOOLCHAIN}gcc',
+		AR     = '${TOOLCHAIN}ar',
+		RANLIB = '${TOOLCHAIN}ranlib',
+		
+		CCFLAGS   = Split('-O2 -Wall -ggdb -mcpu=${CPU_FAMILY} -mthumb -ffunction-sections'),
+		CXXFLAGS  = Split('-std=c++20 -fno-exceptions -fno-rtti -Wno-pmf-conversions'),
+		ASFLAGS   = Split('-c -x assembler-with-cpp -mcpu=${CPU_FAMILY} -mthumb'),
+		LINKFLAGS = Split('-Wall -mcpu=${CPU_FAMILY} -mthumb -nostartfiles -Wl,-T${LINK_SCRIPT} -Wl,--gc-sections'),
+		
+		CPPPATH = [laks_dir],
+		LIBPATH = [ld_dir],
+		
+		LIB_SOURCES = [],
+		
+		CPU_FAMILY = family,
+	)
+	
+	if has_mcu:
+		env.Append(CCFLAGS = Split('-mfloat-abi=hard -mfpu=fpv4-sp-d16'))
+		env.Append(LINKFLAGS = Split('-mfloat-abi=hard -mfpu=fpv4-sp-d16'))
+		env.Append(CPPDEFINES = ['HAS_FPU'])
+
+def select_stm32(env, variant):
+	family = variant[5:9]
+	pin_count = variant[9]
+	flash = variant[10]
+	
+	if family.startswith('f0'):
+		select_arm(env, 'cortex-m0')
+		env.Append(CPPDEFINES = ['STM32F0'])
+
+		sram = family[2]
+		
+		env['LINK_SCRIPT'] = {
+			('4', '6'): 'stm32_f04_6.ld',
+			('5', '8'): 'stm32_f05_8.ld',
+		}[sram, flash]
+	
+	elif family == 'f103':
+		select_arm(env, 'cortex-m3')
+		env.Append(CPPDEFINES = ['STM32F1'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_f1_8.ld',
+			'b': 'stm32_f1_b.ld',
+		}[flash]
+	
+	elif family == 'f303':
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F3'])
+		
+		env['LINK_SCRIPT'] = {
+			'b': 'stm32_f303_b.ld',
+			'c': 'stm32_f303_c.ld',
+		}[flash]
+	
+	elif family == 'f373':
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F3'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_f373_8.ld',
+			'b': 'stm32_f373_b.ld',
+			'c': 'stm32_f373_c.ld',
+		}[flash]
+	
+	elif family in ('f401'):
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F4'])
+		
+		env['LINK_SCRIPT'] = {
+			'e': 'stm32_f401_e.ld',
+		}[flash]
+	
+	elif family in ('f405', 'f407'):
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F4'])
+		
+		env['LINK_SCRIPT'] = {
+			'e': 'stm32_f4_e.ld',
+			'g': 'stm32_f4_g.ld',
+		}[flash]
+	
+	elif family in ('l051', 'l052', 'l053'):
+		select_arm(env, 'cortex-m0plus')
+		env.Append(CPPDEFINES = ['STM32L0'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_l0_8.ld',
+		}[flash]
+	
+	else:
+		print('Unknown stm32 family: %s' % family)
+		Exit(1)
+
+def SelectMCU(env, mcu, variant_dir = None):
+	mcu = mcu.lower()
+	
+	if mcu.startswith('stm32'):
+		select_stm32(env, mcu)
+	
+	else:
+		print('Unknown MCU: %s' % mcu)
+		Exit(1)
+	
+	SConscript(main_sconscript, variant_dir = variant_dir, exports = 'env')
+
+AddMethod(Environment, SelectMCU)
diff --git a/build/scons_tools/tool_firmware.py b/build/scons_tools/tool_firmware.py
new file mode 100644
index 0000000..b1ead1f
--- /dev/null
+++ b/build/scons_tools/tool_firmware.py
@@ -0,0 +1,13 @@
+from SCons.Script import *
+
+def Firmware(env, target, sources, **kwargs):
+	objects = [env.Object(f) for f in Flatten([sources, env['LIB_SOURCES']])]
+	firmware = env.Program(target, objects, **kwargs)
+	#env.Depends(firmware, env['LINK_SCRIPT']) # TODO
+	return firmware
+
+def exists():
+    return True
+
+def generate(env):
+    env.AddMethod(Firmware)
\ No newline at end of file
diff --git a/build/scons_tools/tool_selectmcu.py b/build/scons_tools/tool_selectmcu.py
new file mode 100644
index 0000000..1e2b0ee
--- /dev/null
+++ b/build/scons_tools/tool_selectmcu.py
@@ -0,0 +1,132 @@
+from SCons.Script import *
+
+laks_dir = Dir('..')
+ld_dir = Dir('../ld_scripts')
+main_sconscript = File('../SConscript')
+
+def select_arm(env, family):
+	env.SetDefault(
+		TOOLCHAIN = 'arm-none-eabi-',
+	)
+	
+	if family == 'cortex-m4f':
+		family = 'cortex-m4'
+		has_mcu = True
+	else:
+		has_mcu = False
+	
+	env.Replace(
+		CC     = '${TOOLCHAIN}gcc',
+		CXX    = '${TOOLCHAIN}g++',
+		AS     = '${TOOLCHAIN}gcc',
+		LINK   = '${TOOLCHAIN}gcc',
+		AR     = '${TOOLCHAIN}ar',
+		RANLIB = '${TOOLCHAIN}ranlib',
+		
+		CCFLAGS   = Split('-O2 -Wall -ggdb -mcpu=${CPU_FAMILY} -mthumb -ffunction-sections'),
+		CXXFLAGS  = Split('-std=c++20 -fno-exceptions -fno-rtti -Wno-pmf-conversions'),
+		ASFLAGS   = Split('-c -x assembler-with-cpp -mcpu=${CPU_FAMILY} -mthumb'),
+		LINKFLAGS = Split('-Wall -mcpu=${CPU_FAMILY} -mthumb -nostartfiles -Wl,-T${LINK_SCRIPT} -Wl,--gc-sections'),
+		
+		CPPPATH = [laks_dir],
+		LIBPATH = [ld_dir],
+		
+		LIB_SOURCES = [],
+		
+		CPU_FAMILY = family,
+	)
+	
+	if has_mcu:
+		env.Append(CCFLAGS = Split('-mfloat-abi=hard -mfpu=fpv4-sp-d16'))
+		env.Append(LINKFLAGS = Split('-mfloat-abi=hard -mfpu=fpv4-sp-d16'))
+		env.Append(CPPDEFINES = ['HAS_FPU'])
+
+def select_stm32(env, variant):
+	family = variant[5:9]
+	pin_count = variant[9]
+	flash = variant[10]
+	
+	if family.startswith('f0'):
+		select_arm(env, 'cortex-m0')
+		env.Append(CPPDEFINES = ['STM32F0'])
+
+		sram = family[2]
+		
+		env['LINK_SCRIPT'] = {
+			('4', '6'): 'stm32_f04_6.ld',
+			('5', '8'): 'stm32_f05_8.ld',
+		}[sram, flash]
+	
+	elif family == 'f103':
+		select_arm(env, 'cortex-m3')
+		env.Append(CPPDEFINES = ['STM32F1'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_f1_8.ld',
+			'b': 'stm32_f1_b.ld',
+		}[flash]
+	
+	elif family == 'f303':
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F3'])
+		
+		env['LINK_SCRIPT'] = {
+			'b': 'stm32_f303_b.ld',
+			'c': 'stm32_f303_c.ld',
+		}[flash]
+	
+	elif family == 'f373':
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F3'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_f373_8.ld',
+			'b': 'stm32_f373_b.ld',
+			'c': 'stm32_f373_c.ld',
+		}[flash]
+	
+	elif family in ('f401'):
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F4'])
+		
+		env['LINK_SCRIPT'] = {
+			'e': 'stm32_f401_e.ld',
+		}[flash]
+	
+	elif family in ('f405', 'f407'):
+		select_arm(env, 'cortex-m4f')
+		env.Append(CPPDEFINES = ['STM32F4'])
+		
+		env['LINK_SCRIPT'] = {
+			'e': 'stm32_f4_e.ld',
+			'g': 'stm32_f4_g.ld',
+		}[flash]
+	
+	elif family in ('l051', 'l052', 'l053'):
+		select_arm(env, 'cortex-m0plus')
+		env.Append(CPPDEFINES = ['STM32L0'])
+		
+		env['LINK_SCRIPT'] = {
+			'8': 'stm32_l0_8.ld',
+		}[flash]
+	
+	else:
+		print('Unknown stm32 family: %s' % family)
+		Exit(1)
+
+def SelectMCU(env, mcu, variant_dir = None):
+	mcu = mcu.lower()
+	
+	if mcu.startswith('stm32'):
+		select_stm32(env, mcu)
+	
+	else:
+		print('Unknown MCU: %s' % mcu)
+		Exit(1)
+	
+	SConscript(main_sconscript, variant_dir = variant_dir, exports = 'env')
+def exists():
+    return True
+
+def generate(env):
+    env.AddMethod(SelectMCU)
\ No newline at end of file