Initial skeleton PRU project, with CI/CD

Author: ArcaneNibble

.github/workflows/build.yml

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+on:
+    - push
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:            
+            - uses: actions/checkout@v4
+
+            - name: Install toolchain
+              run: |
+                wget https://github.com/dinuxbg/gnupru/releases/download/2025.05/pru-elf-2025.05.amd64.tar.xz
+                tar xJf pru-elf-2025.05.amd64.tar.xz
+                echo "$(pwd)/pru-elf/bin" >> $GITHUB_PATH
+
+            - name: Compile project
+              run: make
+            
+            - uses: actions/upload-artifact@v4
+              with:
+                name: pru_ledpwm
+                path: pru_ledpwm.*

.gitignore

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+*.o
+*.elf
+*.bin

Makefile

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+CC = pru-gcc
+OBJCOPY = pru-objcopy
+BUILD_TARGET = pru_ledpwm
+
+ASFLAGS += -g
+CFLAGS += -g -Wall -Wno-main -Os
+LDFLAGS += -g -nostdlib -mmcu=am1808.pru1.specs
+
+.PHONY: all clean
+
+all: $(BUILD_TARGET).bin
+
+$(BUILD_TARGET).bin: $(BUILD_TARGET).elf
+
+$(BUILD_TARGET).elf: start.o main.o
+	$(CC) $(LDFLAGS) -o $@ $+
+
+%.bin: %.elf
+	$(OBJCOPY) -O binary $< $@
+
+clean:
+	rm -rf *.o *.elf *.bin

device-specs/am1808.pru0.specs

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+*cpp_device:
+-D__AM1808_PRU0__ -D__AM1808__
+
+*link_device:
+%{!r:--gc-sections --defsym=__IMEM_SIZE=4K --defsym=__DMEM_SIZE=512 --defsym=__HEAP_SIZE=0 --defsym=__STACK_SIZE=32 -z common-page-size=4 -z max-page-size=8}

device-specs/am1808.pru1.specs

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+*cpp_device:
+-D__AM1808_PRU1__ -D__AM1808__
+
+*link_device:
+%{!r:--gc-sections --defsym=__IMEM_SIZE=4K --defsym=__DMEM_SIZE=512 --defsym=__HEAP_SIZE=0 --defsym=__STACK_SIZE=32 -z common-page-size=4 -z max-page-size=8}

main.c

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+void main() {
+    __halt();
+}

start.S

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+.sect ".init0"
+.global _start
+
+_start:
+    jmp main