From 62216df450ab8fd0d2e23d3020a694fa1e4f0566 Mon Sep 17 00:00:00 2001
From: Samy Kamkar <git@samy.pl>
Date: Sat, 16 Jan 2021 12:07:52 -0800
Subject: [PATCH] Improve reliability of PN532 HSU

---
 libnfc/buses/uart.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libnfc/buses/uart.c b/libnfc/buses/uart.c
index 0cff3f2..62f0f01 100644
--- a/libnfc/buses/uart.c
+++ b/libnfc/buses/uart.c
@@ -395,7 +395,11 @@ uart_send_single(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int ti
   (void) timeout;
   int error = 0;
   for (int i = 0; i < szTx; i++)
+  {
     error |= uart_send(sp, pbtTx+i, 1, timeout);
+    usleep(9);
+  }
+
 
   return error ? NFC_EIO : NFC_SUCCESS;
 }