epicardium: load l0dable when present, for testing

epicardium/main.c

 #include <stdio.h>
 #include <stdlib.h>
 
+#include <ff.h>
+
 #include "max32665.h"
 #include "uart.h"
 #include "cdcacm.h"
@@ -100,17 +102,28 @@ int main(void)
 	LOG_INFO("startup", "Initializing dispatcher ...");
 	api_dispatcher_init();
 
-	LOG_INFO("startup", "Testing l0der ...");
-	struct l0dable_info info;
-	int res = l0der_load_path("blinky.elf", &info);
-	if (res != 0) {
-		LOG_ERR("startup", "l0der failed: %d\n", res);
+	/*
+	 * See if there's a l0dable.elf to run. If not, run pycardium.
+	 * This is temporary until epicardium gets a l0dable API from pycardium.
+	 */
+	const char *l0dable = "l0dable.elf";
+	if (f_stat(l0dable, NULL) == FR_OK) {
+		LOG_INFO("startup", "Running %s ...", l0dable);
+		struct l0dable_info info;
+		int res = l0der_load_path(l0dable, &info);
+		if (res != 0) {
+			LOG_ERR("startup", "l0der failed: %d\n", res);
+		} else {
+			LOG_INFO("startup", "Starting %s on core1 ...", l0dable);
+			core1_start(info.isr_vector);
+		}
 	} else {
-		LOG_INFO("startup", "Starting core1 payload ...");
-		core1_start(info.isr_vector);
+			LOG_INFO("startup", "Starting pycardium on core1 ...");
+			core1_start((void *)0x10080000);
 	}
 
 
+
 	LOG_INFO("startup", "Starting FreeRTOS ...");
 	vTaskStartScheduler();