Unify bare metal projects

tutorials/stm32/nucleo-h563zi/minimal/Makefile

@@ -8,7 +8,7 @@ CFLAGS += -Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion
 CFLAGS += -g3 -Os -ffunction-sections -fdata-sections
 CFLAGS += -I. -I$(MGDIR) -Icmsis_core/CMSIS/Core/Include -Icmsis_h5/Include -Imongoose -Ilittlefs
 CFLAGS += -mcpu=cortex-m33 -mthumb -mfpu=fpv5-sp-d16 -mfloat-abi=hard $(CFLAGS_EXTRA)
-LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nosys.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nano.specs -lc -lgcc -Wl,--gc-sections
 
 SOURCES = main.c hal.c
 SOURCES += littlefs/lfs.c littlefs/lfs_util.c
@@ -28,6 +28,10 @@ firmware.bin: firmware.elf
 	@echo
 	@echo "To flash, run 'make flash', or use STM32CubeProgrammer"
 
+# Show all symbols sorted by size
+show_symbols_sorted_by_size: firmware.bin
+	arm-none-eabi-readelf -sW firmware.elf | sed 1,3d | sed 's,^.*: ,,' | tr -s ' ' | cut -d ' ' -f 2,7 | sort -nk1 | grep -v '^0 '
+
 flash: firmware.bin
 	STM32_Programmer_CLI -c port=swd mode=UR -w firmware.elf -hardRst
 

tutorials/stm32/nucleo-h563zi/minimal/hal.c

@@ -3,6 +3,12 @@
 
 #include "hal.h"
 
+// Added to minimise the bin size: avoid pulling printf and friends
+void __assert_func(const char *s, int line, const char *fn, const char *expr) {
+  (void) s, (void) line, (void) fn, (void) expr;
+  for (;;) (void) 0;  // or trigger the fault handler
+}
+
 bool hal_timer_expired(volatile uint64_t *t, uint64_t period, uint64_t now) {
   uint64_t diff = now - *t;         // Wrap-safe elapsed time since last expiry
   if (period == 0) return false;    // Avoid division by zero

tutorials/stm32/nucleo-h563zi/minimal/main.c

@@ -53,13 +53,15 @@ static void http_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
           .enable_dir_listing = true,
       };
       mg_http_serve_dir(c, hm, &opts);
+    } else if (mg_match(hm->uri, mg_str("/api/crash"), NULL)) {
+      __asm volatile("udf #0");  // Trigger HardFault
     } else {
-      size_t u = hal_ram_used(), t = u + hal_ram_free();
       mg_http_reply(c, 200, "",
                     "Hi from Mongoose!\n"
-                    "Tick %llu\n"
-                    "RAM usage: %zu / %zu (%zu %%)\n",
-                    hal_get_tick(), u, t, (size_t) (100 * u / t));
+                    "tick:     %llu\n"
+                    "ram used: %zu\n"
+                    "ram free: %zu\n",
+                    hal_get_tick(), hal_ram_used(), hal_ram_free());
     }
   }
 }
@@ -74,12 +76,15 @@ int main(void) {
   hal_gpio_output(LED_2);
   hal_gpio_output(LED_3);
   hal_ethernet_init();
-  MG_INFO(("Initialised. CPU clock: %lu MHz", SystemCoreClock / 1000000));
 
   struct mg_mgr mgr;
   mg_mgr_init(&mgr);
   mg_http_listen(&mgr, "http://0.0.0.0", http_ev_handler, NULL);
 
+  MG_INFO(("Initialised. CPU clock: %lu MHz", SystemCoreClock / 1000000));
+  MG_INFO(("RAM used: %zu, free: %zu", hal_ram_used(), hal_ram_free()));
+  MG_INFO(("Crash record: %M", mg_print_crash_record));
+
   // Create directory for Web file manager. Will be mapped to /files/ URL
   mkdir("/fs", 0755);
   MG_INFO(("File manager operations:"));