From 55a789d65a808f29e153427b6001650bee826ddf Mon Sep 17 00:00:00 2001
From: Harald Barth <haba@kth.se>
Date: Fri, 19 Nov 2021 00:03:21 +0100
Subject: [PATCH] set RMT clock to microseconds

---
 DCCRMT.cpp | 2 +-
 DCCRMT.h   | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/DCCRMT.cpp b/DCCRMT.cpp
index 21002cf..a0d8756 100644
--- a/DCCRMT.cpp
+++ b/DCCRMT.cpp
@@ -87,7 +87,7 @@ RMTPin::RMTPin(byte pin, byte ch, byte plen) {
   bzero(&config, sizeof(rmt_config_t));
   config.rmt_mode = RMT_MODE_TX;
   config.channel = channel = (rmt_channel_t)ch;
-  config.clk_div = 1;             // use 80Mhz clock directly
+  config.clk_div = RMT_CLOCK_DIVIDER;
   config.gpio_num = (gpio_num_t)pin;
   config.mem_block_num = 2; // With longest DCC packet 11 inc checksum (future expansion)
                             // number of bits needed is 22preamble + start +
diff --git a/DCCRMT.h b/DCCRMT.h
index 2e119e6..bd235b7 100644
--- a/DCCRMT.h
+++ b/DCCRMT.h
@@ -23,8 +23,10 @@
 #include "soc/rmt_reg.h"
 #include "soc/rmt_struct.h"
 
-#define DCC_1_HALFPERIOD 4640 // 1 / 80000000 * 4640 = 58us
-#define DCC_0_HALFPERIOD 8000
+// make calculations easy and set up for microseconds
+#define RMT_CLOCK_DIVIDER 80
+#define DCC_1_HALFPERIOD 58  //4640 // 1 / 80000000 * 4640 = 58us
+#define DCC_0_HALFPERIOD 100 //8000
 
 class RMTPin {
  public: