From 5365a9f9cf2b488edb4e93cd7c1f83bb8ecb34a4 Mon Sep 17 00:00:00 2001
From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Date: Tue, 18 Jan 2022 08:37:07 +0100
Subject: [PATCH] ice40: program_cram, add TN ref

---
 src/ice40.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ice40.cpp b/src/ice40.cpp
index 33089a7..1531b1a 100644
--- a/src/ice40.cpp
+++ b/src/ice40.cpp
@@ -57,6 +57,9 @@ void Ice40::reset()
 		printSuccess("DONE");
 }
 
+/* cf. TN1248 (iCE40 Programming and Configuration)
+ * Appendix A. SPI Slave Configuration Procedure
+ */
 bool Ice40::program_cram(uint8_t *data, uint32_t length)
 {
 	uint32_t timeout = 1000;