pc98_usb: Receive extra byte for 0xFB response

PC-9801-119(CMP-6D1Y7) https://geekhack.org/index.php?topic=110094.msg3164441#msg3164441
tmk · Jun 18, 2023 · c168e21 · c168e21
1 parent db4268b
commit c168e21
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/converter/pc98_usb/matrix.c b/converter/pc98_usb/matrix.c
@@ -60,8 +60,11 @@ static void pc98_send(uint8_t data)
 
 static int16_t pc98_wait_response(void)
 {
-    int16_t code = -1;
-    uint8_t timeout = 255;
+    int16_t code;
+    uint8_t timeout;
+RETRY:
+    code = -1;
+    timeout = 255;
     while (timeout-- && (code = serial_recv2()) == -1) _delay_ms(1);
 
     // Keyboards require RDY pulse >=37us to send next data
@@ -71,6 +74,7 @@ static int16_t pc98_wait_response(void)
     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 
     xprintf("r%04X ", code);
+    if (code == 0xFB) goto RETRY;
     return code;
 }