From 8c24f968a58d0e95ced6286de8c4ab558e6b6cc7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torsten=20R=C3=B6mer?= <torsten.roemer@luniks.net>
Date: Wed, 20 Sep 2023 20:05:45 +0200
Subject: [PATCH] set frame in SRAM sequential mode, saving more power (#43)

---
 thermidity-avr/display.c | 14 ++++++++++----
 thermidity-avr/sram.c    |  6 ++++++
 thermidity-avr/sram.h    |  7 +++++++
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/thermidity-avr/display.c b/thermidity-avr/display.c
index b93d427..127f027 100644
--- a/thermidity-avr/display.c
+++ b/thermidity-avr/display.c
@@ -118,17 +118,23 @@ void sramToDisplay(void) {
         byte = transmit(~byte);
     }
     displayDes();
-    sramDes();
     
+    sramDes();
     sramWriteStatus(SRAM_BYTE);
 }
 
 void setFrame(uint8_t byte) {
     uint16_t bytes = DISPLAY_WIDTH * DISPLAY_H_BYTES;
-
-    for (int i = 0; i < bytes; i++) {
-        sramWrite(i, byte);
+    
+    sramWriteStatus(SRAM_SEQU);
+    
+    sramSel();
+    sramInitWrite(0x0);
+    for (uint16_t i = 0; i < bytes; i++) {
+        transmit(byte);
     }
+    sramDes();
+    sramWriteStatus(SRAM_BYTE);
 }
 
 width_t writeBitmap(row_t row, col_t col, uint16_t index) {
diff --git a/thermidity-avr/sram.c b/thermidity-avr/sram.c
index d7ec69c..55e8d9a 100644
--- a/thermidity-avr/sram.c
+++ b/thermidity-avr/sram.c
@@ -71,6 +71,12 @@ uint8_t sramReadStatus(void) {
     return status;
 }
 
+void sramInitWrite(uint16_t address) {
+    transmit(SRAM_WRITE);
+    transmit(address >> 8);
+    transmit(address);    
+}
+
 void sramInitRead(uint16_t address) {
     transmit(SRAM_READ);
     transmit(address >> 8);
diff --git a/thermidity-avr/sram.h b/thermidity-avr/sram.h
index a5f1b52..8fae657 100644
--- a/thermidity-avr/sram.h
+++ b/thermidity-avr/sram.h
@@ -65,6 +65,13 @@ void sramWriteStatus(uint8_t status);
  */
 uint8_t sramReadStatus(void);
 
+/**
+ * Sends write command and sets the given address.
+ * Useful for writing in sequential or page mode.
+ * @param address
+ */
+void sramInitWrite(uint16_t address);
+
 /**
  * Sends read command and sets the given address.
  * Useful for reading in sequential or page mode.