altos/chaoskey-v1.0: Add endpoint for reading flash contents

This creates another IN endpoint which provides the contents of flash
for validation of the firmware load on the host.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/kernel/ao_flash_readout.c b/src/kernel/ao_flash_readout.c
new file mode 100644
index 00000000..46b5ba7a
--- /dev/null
+++ b/src/kernel/ao_flash_readout.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2018 Keith Packard <keithp@keithp.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <ao.h>
+#include <ao_usb.h>
+#include <ao_flash_readout.h>
+
+#ifndef AO_FLASH_READOUT_BASE
+#define AO_FLASH_READOUT_BASE	AO_BOOT_LOADER_BASE
+#define AO_FLASH_READOUT_BOUND	AO_BOOT_APPLICATION_BOUND
+#endif
+
+static void
+ao_flash_readout(void)
+{
+	uint8_t	*base = (uint8_t *) AO_FLASH_READOUT_BASE;
+	uint8_t	*bound = (uint8_t *) AO_FLASH_READOUT_BOUND;
+	uint8_t	*p = base;
+
+	for (;;) {
+		ao_arch_block_interrupts();
+		while (!ao_usb_running) {
+			p = base;
+			ao_sleep(&ao_usb_running);
+		}
+		ao_arch_release_interrupts();
+		ao_flash_readout_putchar(*p++);
+		if (p == bound)
+			p = base;
+	}
+}
+
+static struct ao_task	ao_flash_readout_task;
+
+void
+ao_flash_readout_init(void)
+{
+	ao_add_task(&ao_flash_readout_task, ao_flash_readout, "flash_readout");
+}