avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/misc/status_led.c

@@ -0,0 +1,125 @@
+/*
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <status_led.h>
+
+/*
+ * The purpose of this code is to signal the operational status of a
+ * target which usually boots over the network; while running in
+ * U-Boot, a status LED is blinking. As soon as a valid BOOTP reply
+ * message has been received, the LED is turned off. The Linux
+ * kernel, once it is running, will start blinking the LED again,
+ * with another frequency.
+ */
+
+/* ------------------------------------------------------------------------- */
+
+typedef struct {
+	led_id_t mask;
+	int state;
+	int period;
+	int cnt;
+} led_dev_t;
+
+led_dev_t led_dev[] = {
+    {	STATUS_LED_BIT,
+	STATUS_LED_STATE,
+	STATUS_LED_PERIOD,
+	0,
+    },
+#if defined(STATUS_LED_BIT1)
+    {	STATUS_LED_BIT1,
+	STATUS_LED_STATE1,
+	STATUS_LED_PERIOD1,
+	0,
+    },
+#endif
+#if defined(STATUS_LED_BIT2)
+    {	STATUS_LED_BIT2,
+	STATUS_LED_STATE2,
+	STATUS_LED_PERIOD2,
+	0,
+    },
+#endif
+#if defined(STATUS_LED_BIT3)
+    {	STATUS_LED_BIT3,
+	STATUS_LED_STATE3,
+	STATUS_LED_PERIOD3,
+	0,
+    },
+#endif
+#if defined(STATUS_LED_BIT4)
+    {	STATUS_LED_BIT4,
+	STATUS_LED_STATE4,
+	STATUS_LED_PERIOD4,
+	0,
+    },
+#endif
+#if defined(STATUS_LED_BIT5)
+    {	STATUS_LED_BIT5,
+	STATUS_LED_STATE5,
+	STATUS_LED_PERIOD5,
+	0,
+    },
+#endif
+};
+
+#define MAX_LED_DEV	(sizeof(led_dev)/sizeof(led_dev_t))
+
+static int status_led_init_done = 0;
+
+void status_led_init(void)
+{
+	led_dev_t *ld;
+	int i;
+
+	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++)
+		__led_init (ld->mask, ld->state);
+	status_led_init_done = 1;
+}
+
+void status_led_tick (ulong timestamp)
+{
+	led_dev_t *ld;
+	int i;
+
+	if (!status_led_init_done)
+		status_led_init ();
+
+	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
+
+		if (ld->state != STATUS_LED_BLINKING)
+			continue;
+
+		if (++ld->cnt >= ld->period) {
+			__led_toggle (ld->mask);
+			ld->cnt -= ld->period;
+		}
+
+	}
+}
+
+void status_led_set (int led, int state)
+{
+	led_dev_t *ld;
+
+	if (led < 0 || led >= MAX_LED_DEV)
+		return;
+
+	if (!status_led_init_done)
+		status_led_init ();
+
+	ld = &led_dev[led];
+
+	ld->state = state;
+	if (state == STATUS_LED_BLINKING) {
+		ld->cnt = 0;		/* always start with full period    */
+		state = STATUS_LED_ON;	/* always start with LED _ON_       */
+	}
+	__led_set (ld->mask, state);
+}