From 0880d0b01a016177f047cc07a6a11d5e3639d095 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 5 Sep 2025 18:47:55 -0400
Subject: usb: add nack to protocol

---
 fw/usb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'fw/usb.c')

diff --git a/fw/usb.c b/fw/usb.c
index 7f283e1..532bafd 100644
--- a/fw/usb.c
+++ b/fw/usb.c
@@ -86,8 +86,10 @@ idleState(void) {
 		case 'e': state.next = echoState; break;
 		case 'w': state.next = writeEepromState; break;
 		case 'r': state.next = readEepromState; break;
-		default: break; // invalid command
+		default: putsUSBUSART("nack\n"); break; // invalid command
 		}
+	} else if (readLen > 0) {
+		putsUSBUSART("nack\n");
 	}
 
 	return &state;
-- 
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