shell: led: add command to enable/disable LEDs

include/shell/led.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int shell_led(struct console *con, size_t argc, const char **argv);

source/shell/Makefile

@@ -6,6 +6,7 @@ obj-y += source/shell/cmd.o
 obj-y += source/shell/echo.o
 obj-y += source/shell/flash.o
 obj-y += source/shell/ftl.o
+obj-y += source/shell/led.o
 obj-y += source/shell/mufs.o
 obj-y += source/shell/progress.o
 obj-y += source/shell/rtc.o

source/shell/led.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libopencm3/stm32/gpio.h>
+
+#include <console.h>
+#include <led.h>
+
+extern struct led leds[];
+extern size_t nleds;
+
+int shell_led(struct console *con, size_t argc, const char **argv)
+{
+	size_t led_id = 0;
+	int state = 0;
+
+	if (argc >= 2)
+		state = (strcmp(argv[1], "on") == 0);
+
+	if (argc >= 1)
+		led_id = strtoul(argv[0], NULL, 0);
+
+	if (led_id > nleds) {
+		fprintf(con->fp, "error: unknown LED ID %d\n", led_id);
+		return -1;
+	}
+
+	if (state) {
+		led_enable(leds + led_id);
+	} else {
+		led_disable(leds + led_id);
+	}
+
+	return 0;
+}