feat: write RISC-V binary file with weakly linked, overridable symbols

- Adds functionality to write RISC-V binary files using weak symbols, allowing overrides in linked projects
- Supports flexible integration where default binary data can be replaced by custom definitions if needed

.gitignore

@@ -1,6 +1,7 @@
 # Buid files
 build/
 *.tar.gz
+cx9261a_riscv_bin.c
 
 # System generated files
 # -- macOS

Makefile

@@ -26,6 +26,7 @@ CFLAGS_DEBUG := $(CFLAGS) $(DEBUG_FLAGS)
 CFLAGS_RELEASE := $(CFLAGS) $(RELEASE_FLAGS)
 
 # Collect source files
+BIN_SRC := $(CURDIR)/cx9261a_riscv_bin.c
 SRCS := $(CURDIR)/cx9261adriver_c.cpp $(CURDIR)/cx9261A_api/cx9261adriver.cpp
 TEST_SRC := ld_test.c
 PACKAGE_HEADERS := ./cx9261adriver_c.h
@@ -33,6 +34,9 @@ PACKAGE_HEADERS := ./cx9261adriver_c.h
 # Default target
 all: $(foreach arch, $(ARCHS), $(BUILD_DIR)/$(arch)/lib$(PROJECT_NAME)_dbg.a $(BUILD_DIR)/$(arch)/lib$(PROJECT_NAME).a)
 
+$(BIN_SRC): $(CURDIR)/cx9261A_api/MultiPointsCalib_v1.7.bin
+	$(CURDIR)/tools/gen_riscvbin.py $< -o $(CURDIR)
+
 # Rule to create debug libraries for different architectures
 $(BUILD_DIR)/%/lib$(PROJECT_NAME)_dbg.a: $(SRCS)
 	@mkdir -p $(BUILD_DIR)/$*/debug
@@ -48,21 +52,22 @@ $(BUILD_DIR)/%/lib$(PROJECT_NAME).a: $(SRCS)
 # Clean up
 clean:
 	rm -rf $(BUILD_DIR) *.tar.gz
+	rm -rf  $(CURDIR)/cx9261a_riscv_bin.c
 
 # Run link tests
 test: all $(foreach arch, $(ARCHS), $(BUILD_DIR)/$(arch)/ld_test $(BUILD_DIR)/$(arch)/ld_test_dbg)
 	@echo "Link test success!"
 
 # Debug link tests
-$(BUILD_DIR)/%/ld_test_dbg: $(SRCS) $(TEST_SRC)
-	@$(CC) $(CFLAGS_DEBUG) -mcpu=$* ld_test.c -o $@ -L$(BUILD_DIR)/$* -l$(PROJECT_NAME)_dbg -lstdc++ -lm -specs=nosys.specs
+$(BUILD_DIR)/%/ld_test_dbg: $(SRCS) $(TEST_SRC) $(BIN_SRC)
+	@$(CC) $(CFLAGS_DEBUG) -mcpu=$* ld_test.c $(BIN_SRC) -o $@ -L$(BUILD_DIR)/$* -l$(PROJECT_NAME)_dbg -lstdc++ -lm -specs=nosys.specs
 
 # Release link tests
-$(BUILD_DIR)/%/ld_test: $(SRCS) $(TEST_SRC)
-	@$(CC) $(CFLAGS_RELEASE) -mcpu=$* ld_test.c -o $@ -L$(BUILD_DIR)/$* -l$(PROJECT_NAME) -lstdc++ -lm -specs=nosys.specs
+$(BUILD_DIR)/%/ld_test: $(SRCS) $(TEST_SRC) $(BIN_SRC)
+	@$(CC) $(CFLAGS_RELEASE) -mcpu=$* ld_test.c $(BIN_SRC) -o $@ -L$(BUILD_DIR)/$* -l$(PROJECT_NAME) -lstdc++ -lm -specs=nosys.specs
 
 # Package for release - bundle debug and release versions for each architecture separately
-package: all
+package: all $(BIN_SRC)
 	@echo "Packaging for release..."
 	@$(foreach arch, $(ARCHS), \
 		mkdir -p release_$(arch)/lib; \
@@ -72,6 +77,7 @@ package: all
 		cp $(BUILD_DIR)/$(arch)/lib$(PROJECT_NAME).a release_$(arch)/lib/; \
 		cp $(PACKAGE_HEADERS) release_$(arch)/include/; \
 		cp $(SRCS) release_$(arch)/dbg/cx9261a_c/; \
+		cp $(CURDIR)/cx9261a_riscv_bin.c release_$(arch)/; \
 		tar -czvf release_$(arch).tar.gz -C release_$(arch) .; \
 		rm -rf release_$(arch); \
 	)

cx9261A_api/cx9261adriver.cpp

@@ -5,6 +5,17 @@
 #include "cx9261adriver.h"
 #include "utils.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+__attribute__((weak)) uint32_t CX9261A_RiscvBinLen = 0;
+__attribute__((weak)) uint8_t *CX9261A_RiscvBin = nullptr;
+
+#ifdef __cplusplus
+}
+#endif
+
 namespace CX9261A {
 
 void initialChip()
@@ -672,6 +683,9 @@ void configRISCV(const bool on)
     if (on) {
         writeSpi(0x071, 0x00);
         writeSpi(0x071, 0x29);
+        for (size_t i = 0; i < CX9261A_RiscvBinLen; i++) {
+            writeSpi(0x070, CX9261A_RiscvBin[i]);
+        }
         writeSpi(0x236, 0x0F);
         writeSpi(0x20A, 0x01);
         writeSpi(0x071, 0x26);

tools/gen_riscvbin.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import glob
+from datetime import datetime
+
+def convert_bin_to_c(bin_file, output_dir):
+    # Read the bin file
+    with open(bin_file, 'rb') as f:
+        bin_data = f.read()
+
+    # Get the length of the bin file
+    bin_len = len(bin_data)
+
+    # Set the output file path within the specified directory
+    output_file = os.path.join(output_dir, 'cx9261a_riscv_bin.c')
+    
+    with open(output_file, 'w') as f:
+        # Write metadata comments
+        f.write(f'// Generated C code array\n')
+        f.write(f'// Date: {datetime.now().strftime("%Y-%m-%d %H:%M:%S")}\n')
+        f.write(f'// Source file: {os.path.basename(bin_file)}\n\n')
+        
+        # Write headers and data length
+        f.write('#include <stdint.h>\n')
+        f.write('#include "cx9261adriver_c.h"\n\n')
+        f.write(f'uint32_t CX9261A_RiscvBinLen = {bin_len};\n')
+        f.write(f'uint8_t *CX9261A_RiscvBin = (uint8_t[]){{\n\t')
+        
+        # Write data as hex values in the array
+        for i, byte in enumerate(bin_data):
+            f.write(f'0x{byte:02X}, ')
+            # Add a newline every 12 bytes
+            if (i + 1) % 12 == 0:
+                f.write('\n\t')
+        
+        # Add a newline if the last line has fewer than 12 bytes
+        if bin_len % 12 != 0:
+            f.write('\n')
+        
+        # End the array
+        f.write('};\n')
+    
+    print(f"Generated C file: {output_file}")
+
+if __name__ == "__main__":
+    # Set up command line argument parsing
+    parser = argparse.ArgumentParser(description="Convert a CX9261A Riscv bin file to a C code array.")
+    parser.add_argument("bin_file", type=str, nargs='?', help="Path to the bin file (optional)")
+    parser.add_argument("-o", "--output_dir", type=str, default=".", help="Output directory (default is the current directory)")
+
+    # Parse arguments
+    args = parser.parse_args()
+
+    # If no bin file is provided, search for a .bin file in the current directory
+    if args.bin_file is None:
+        bin_files = glob.glob("*.bin")
+        if len(bin_files) == 0:
+            print("Error: No .bin file found in the current directory.")
+            exit(1)
+        elif len(bin_files) > 1:
+            print("Error: Multiple .bin files found in the current directory. Specify one as an argument.")
+            exit(1)
+        else:
+            args.bin_file = bin_files[0]
+
+    # Check if output directory exists, create if not
+    if not os.path.isdir(args.output_dir):
+        os.makedirs(args.output_dir)
+    
+    # Perform the conversion
+    convert_bin_to_c(args.bin_file, args.output_dir)