# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1697091496 25200
# Node ID 2025ba21026a8ccfb2cfa3ced1afb1a7f9350474
# Parent  047253715fd86b3c3bd83b7083e0940321636ef1
Fix backwards seek calculation

diff -r 047253715fd8 -r 2025ba21026a cdd_mcu.c
--- a/cdd_mcu.c	Wed Oct 11 11:36:18 2023 -0700
+++ b/cdd_mcu.c	Wed Oct 11 23:18:16 2023 -0700
@@ -125,13 +125,15 @@
 				}
 			} else {
 				uint32_t seek_amount;
-				for (seek_amount = max_seek; seek_amount >= min_seek; seek_amount >>= 1)
+				for (seek_amount = max_seek; seek_amount >= min_seek;)
 				{
-					if (context->head_pba - context->seek_pba >= seek_amount) {
+					uint32_t next_seek = seek_amount >> 1;
+					if (context->head_pba - context->seek_pba > next_seek) {
 						break;
 					}
+					seek_amount = next_seek;
 				}
-				if (seek_amount >= min_seek) {
+				if (seek_amount >= min_seek && context->head_pba >= seek_amount) {
 					context->head_pba -= seek_amount;
 				} else if (context->head_pba >= min_seek){
 					context->head_pba -= min_seek;