Unify bare metal projects

tutorials/nxp/frdm-mcxe247/minimal/Makefile

@@ -9,7 +9,7 @@ CFLAGS += -I. -Imongoose -Icmsis_core/CMSIS/Core/Include/
 CFLAGS += -Icmsis_mcxe247/devices/MCXE247/ -Icmsis_mcxe247/devices/MCXE247/periph0/ -Icmsis_mcxe247/devices/MCXE247/drivers/
 CFLAGS += -DCPU_MCXE247VLQ -DCPU_MCXE247VLQ_cm4
 CFLAGS += -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard $(CFLAGS_EXTRA)
-LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs=nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs=nano.specs -lc -lgcc -Wl,--gc-sections
 
 SOURCES = main.c hal.c mongoose/mongoose.c
 SOURCES += cmsis_mcxe247/devices/MCXE247/gcc/startup_MCXE247.S
@@ -38,5 +38,9 @@ cmsis_mcxe247:
 	unzip -q NXP.MCXE247_DFP.26.06.00.pack -d $@
 	rm NXP.MCXE247_DFP.26.06.00.pack
 
+# 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 '
+
 clean:
 	rm -rf firmware.* cmsis_* mongoose/mongoose.*

tutorials/nxp/frdm-mcxe247/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/nxp/frdm-mcxe247/minimal/main.c

@@ -66,9 +66,15 @@ static void http_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     struct mg_http_message *hm = (struct mg_http_message *) ev_data;
     if (mg_match(hm->uri, mg_str("/api/tick"), NULL)) {
       mg_http_reply(c, 200, "", "{%m:%llu}\n", MG_ESC("tick"), hal_get_tick());
+    } else if (mg_match(hm->uri, mg_str("/api/crash"), NULL)) {
+      __asm volatile("udf #0");  // Trigger HardFault
     } else {
-      mg_http_reply(c, 200, "", "Hi from Mongoose, tick %llu\n",
-                    hal_get_tick());
+      mg_http_reply(c, 200, "",
+                    "Hi from Mongoose!\n"
+                    "tick:     %llu\n"
+                    "ram used: %zu\n"
+                    "ram free: %zu\n",
+                    hal_get_tick(), hal_ram_used(), hal_ram_free());
     }
   }
 }
@@ -92,6 +98,10 @@ int main(void) {
   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));
+
   for (;;) {
     mg_mgr_poll(&mgr, 0);
     blink_task();