[ext] json example store data in flash_reserved

modm-io · Mar 20, 2024 · 9017d04 · 9017d04
1 parent 61010f5
commit 9017d04
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Showing 2 changed files with 6 additions and 4 deletions.
diff --git a/examples/nucleo_g474re/json/main.cpp b/examples/nucleo_g474re/json/main.cpp
@@ -17,10 +17,11 @@
 
 // ----------------------------------------------------------------------------
 
-extern "C" const uint32_t __rom_end[];
+extern "C" const uint32_t __flash_reserved_start[];
+
 using json = nlohmann::json;
 
-constexpr auto max_flash_pages{64};
+constexpr auto max_flash_pages{256};
 
 namespace data
 {
@@ -99,9 +100,9 @@ main()
 		for (const auto& byte : alice_binary) { MODM_LOG_INFO.printf(" 0x%02x", byte); }
 		MODM_LOG_INFO << modm::endl;
 
-		// put BSON in first flash page after program
+		// put BSON in reserved flash
 		uint32_t err{0};
-		const size_t page_start = Flash::getPage(reinterpret_cast<uint32_t>(&__rom_end)) + 1;
+		const size_t page_start = Flash::getPage(reinterpret_cast<uint32_t>(&__flash_reserved_start)) + 1;
 		const size_t num_bytes = alice_binary.size();
 		const size_t flash_page_size = Flash::getSize(page_start);
 		const size_t end_page = page_start + (num_bytes + flash_page_size - 1) / flash_page_size;

diff --git a/examples/nucleo_g474re/json/project.xml b/examples/nucleo_g474re/json/project.xml
@@ -2,6 +2,7 @@
   <extends>modm:nucleo-g474re</extends>
   <options>
     <option name="modm:build:build.path">../../../build/nucleo_g474re/json</option>
+    <option name="modm:platform:cortex-m:linkerscript.flash_reserved">1024*16</option>
   </options>
   <modules>
     <module>modm:debug</module>