From 3afac056d4467c9d40841a78bddbc677b8c97d5d Mon Sep 17 00:00:00 2001
From: Camil Staps <info@camilstaps.nl>
Date: Tue, 16 May 2017 16:45:03 +0000
Subject: [PATCH] Resolve #19: added OPT_HIDE_LEADING_ZEROES

---
 README.md            |  3 +++
 SODA_POP/display.ino | 15 +++++++++++----
 SODA_POP/settings.h  |  3 +++
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 31c79a1..1b311fc 100644
--- a/README.md
+++ b/README.md
@@ -143,6 +143,7 @@ uploading the code to the chip.
 There are several features that can be added to the rig if you want to. This is
 done by adding and removing `#define` lines to `settings.h`.
 
+- `OPT_HIDE_LEADING_ZEROES`: hide leading zeroes on frequency display.
 - `OPT_BAND_SELECT`: change the band by pressing RIT for 2s.
 - `OPT_AUTO_BAND`: auto-select bands using a PCA9536 PIO (thanks VK3IL).
 - `OPT_ERASE_EEPROM`: erase the EEPROM by holding RIT for 8s.
@@ -212,6 +213,8 @@ Some images of the connections:
 
 - 2017-05-16:
   - `OPT_AUTO_BAND` (PR [#22](/../../pull/22) by VK3IL)
+  - Made hiding leading zeroes on frequency display a compile-time option
+	(`OPT_HIDE_LEADING_ZEROES`; issue [#19](/../../issues/19))
 - 2017-05-12:
   - VK band plans (PR [#21](/../../pull/21) by VK3IL)
 - 2017-05-04:
diff --git a/SODA_POP/display.ino b/SODA_POP/display.ino
index 5ab52b8..bf6cf0a 100644
--- a/SODA_POP/display.ino
+++ b/SODA_POP/display.ino
@@ -249,16 +249,23 @@ void display_rit()
  */
 void display_freq()
 {
-  // First divide by 100 to remove the fractional Hz digits
   unsigned long frequency = state.op_freq/100;
-  // Then display the digits one by one
+#ifdef OPT_HIDE_LEADING_ZEROES
+  noInterrupts();
+#endif
   state.display.digits[3] = LED_DIGITS[(frequency % 1000000) / 100000];
-  if (state.display.digits[3] == LED_N_0)
-    state.display.digits[3] = 0x00; //blank MSD if 0
   state.display.digits[2] = LED_DIGITS[(frequency % 100000) / 10000];
   state.display.digits[1] = LED_DIGITS[(frequency % 10000) / 1000];
   state.display.digits[0] = LED_DIGITS[(frequency % 1000) / 100];
   state.display.dots = 0x2;
+#ifdef OPT_HIDE_LEADING_ZEROES
+  if (state.display.digits[3] == LED_N_0) {
+    state.display.digits[3] = 0x00;
+    if (state.display.digits[2] == LED_N_0)
+      state.display.digits[2] = 0x00;
+  }
+  interrupts();
+#endif
   state.display.blinking = tuning_blinks[state.tuning_step];
 }
 
diff --git a/SODA_POP/settings.h b/SODA_POP/settings.h
index 8ab9125..af6d8a1 100644
--- a/SODA_POP/settings.h
+++ b/SODA_POP/settings.h
@@ -35,6 +35,9 @@
 
 /* Custom features. For more details, see README.md. */
 
+/* Hide leading zeroes on the frequency display */
+#define OPT_HIDE_LEADING_ZEROES
+
 /* Band selection by pressing RIT for 2s */
 #define OPT_BAND_SELECT