From f32de52b4698b1bb40be97dd8a35c8ba7cfdbc96 Mon Sep 17 00:00:00 2001
From: Jean-Michel Picod <jmichel@google.com>
Date: Fri, 9 Dec 2022 13:17:19 +0100
Subject: [PATCH] Wait a bit longer for the smartcard.

For the max 256-byte frame, SIM wasn't ready early enough, corrupting
the reception buffer with 5 spurious bytes.
Empirically, 109 clock cycles is the minimum value that worked.
Adding 1 clock cycle as a safety buffer.
---
 armsrc/i2c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/armsrc/i2c.c b/armsrc/i2c.c
index b9b536c24..491e12a04 100644
--- a/armsrc/i2c.c
+++ b/armsrc/i2c.c
@@ -235,9 +235,9 @@ static bool I2C_WaitForSim(void) {
 
     // 8051 speaks with smart card.
     // 1000*50*3.07 = 153.5ms
-    // 1000*90*3.07 = 276.3ms
+    // 1000*110*3.07 = 337.7ms
     // 1byte transfer == 1ms with max frame being 256bytes
-    return WaitSCL_H_delay(1000 * 90);
+    return WaitSCL_H_delay(1000 * 110);
 }
 
 // send i2c STOP