From: Keith Packard <keithp@keithp.com>
Date: Tue, 23 Jun 2020 23:15:28 +0000 (-0700)
Subject: altos/ao_storage: allow erased byte value to be set by application
X-Git-Tag: 1.9.5~1^2~47
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=45b00da14ea814cf8f14dcb2cfaccaddd0fbb38d;p=fw%2Faltos

altos/ao_storage: allow erased byte value to be set by application

External flash is usually 0xff for erased bytes, but other memory may
use different values

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

diff --git a/src/kernel/ao_storage.c b/src/kernel/ao_storage.c
index 1554cee7..213ec2d6 100644
--- a/src/kernel/ao_storage.c
+++ b/src/kernel/ao_storage.c
@@ -86,6 +86,10 @@ ao_storage_write(ao_pos_t pos, void *v_buf, uint16_t len)
 	return 1;
 }
 
+#ifndef AO_STORAGE_ERASED_BYTE
+#define AO_STORAGE_ERASED_BYTE 0xff
+#endif
+
 uint8_t
 ao_storage_is_erased(uint32_t pos)
 {
@@ -107,7 +111,7 @@ ao_storage_is_erased(uint32_t pos)
 			goto done;
 		}
 		for (i = 0; i < this_time; i++)
-			if (storage_data[i] != 0xff) {
+			if (storage_data[i] != AO_STORAGE_ERASED_BYTE) {
 				ret = 0;
 				goto done;
 			}