From 86b2520f7d85e4b0209d47241bcab424a2e761de Mon Sep 17 00:00:00 2001
From: Eric Betts <bettse@fastmail.fm>
Date: Tue, 23 Jul 2024 19:19:02 -0700
Subject: [PATCH] Fix R-ack

---
 t_1.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/t_1.c b/t_1.c
index f19dfed..31c31b0 100644
--- a/t_1.c
+++ b/t_1.c
@@ -6,17 +6,13 @@
 
 /* I know my T=1 is terrible, but I'm also only targetting one specific 'card' */
 
-/* TODO:
-   - Implement T=1 chaining receving
-   - Implement T=1 chaining sending
-   */
-
 #define MORE_BIT 0x20
 #define IFSD_VALUE 0xfe
-#define IFSC_VALUE 20 // Fom the SAM ATR
+#define IFSC_VALUE 0xfe // Fom the SAM ATR
 #define R_BLOCK 0x80
 #define R_SEQUENCE_NUMBER_MASK 0x10
 
+// TODO: T1 struct
 uint8_t NAD = 0x00;
 uint8_t dPCB = 0x40; // Init to 0x40 so first call to next_pcb will return 0x00
 uint8_t cPCB = 0x00; // Init to 0x40 so first call to next_pcb will return 0x00
@@ -59,7 +55,7 @@ void seader_t_1_send_ack(Seader* seader) {
     uint8_t frame_len = 0;
 
     frame[0] = NAD;
-    frame[1] = R_BLOCK | dPCB;
+    frame[1] = R_BLOCK | (seader_next_cpcb() >> 2);
     frame[2] = 0x00;
     frame_len = 3;