X-Git-Url: https://jxself.org/git/?p=linux-libre-firmware.git;a=blobdiff_plain;f=atusb%2Fboot.c;fp=atusb%2Fboot.c;h=6826ac69c58ef59167af67194ac3d41271ca60e4;hp=0000000000000000000000000000000000000000;hb=dd4bc9ff49b9a7075e579fdd62fd930d27a9a7df;hpb=c164bf7f87f9081fee7e1a186dd7a87a9a020b9e

diff --git a/atusb/boot.c b/atusb/boot.c
new file mode 100644
index 0000000..6826ac6
--- /dev/null
+++ b/atusb/boot.c
@@ -0,0 +1,77 @@
+/*
+ * fw/boot.c - DFU boot loader for ATUSB
+ *
+ * Written 2008-2011 by Werner Almesberger
+ * Copyright 2008-2011 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include <stdint.h>
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+
+#define F_CPU   8000000UL
+#include <util/delay.h>
+
+#include "usb.h"
+#include "dfu.h"
+
+#include "board.h"
+#include "spi.h"
+#include "atusb/ep0.h"
+
+
+#define	MS_TO_LOOPS(ms) ((uint32_t) (ms)*335)
+
+
+static void (*run_payload)(void) = 0;
+
+
+int main(void)
+{
+	/*
+	 * pgm_read_byte gets cached and there doesn't seem to be any other
+	 * way to dissuade gcc from doing this.
+	 */
+	volatile int zero = 0;
+	uint32_t loop = 0;
+
+	board_init();
+	reset_rf();
+
+	/* now we should be at 8 MHz */
+
+	usb_init();
+	dfu_init();
+
+	/* move interrupt vectors to the boot loader */
+	MCUCR = 1 << IVCE;
+	MCUCR = 1 << IVSEL;
+
+	sei();
+
+	led(1);
+
+	while (loop != MS_TO_LOOPS(2500)) {
+		if (dfu.state == dfuIDLE && pgm_read_byte(zero) != 0xff)
+			loop++;
+		else
+			loop = 0;
+	}
+
+	led(0);
+
+	cli();
+
+	usb_reset();
+	run_payload();
+
+	while (1);	/* not reached */
+}