DCCRMT.cpp

@@ -1,5 +1,5 @@
 /*
- *  © 2021-2024, Harald Barth.
+ *  © 2021-2022, Harald Barth.
  *  
  *  This file is part of DCC-EX
  *
@@ -25,18 +25,6 @@
 #include "DCCWaveform.h" // for MAX_PACKET_SIZE
 #include "soc/gpio_sig_map.h"
 
-// check for right type of ESP32
-#include "soc/soc_caps.h"
-#ifndef SOC_RMT_MEM_WORDS_PER_CHANNEL
-#error This symobol should be defined
-#endif
-#if SOC_RMT_MEM_WORDS_PER_CHANNEL < 64
-#warning This is not an ESP32-WROOM but some other unsupported variant
-#warning You are outside of the DCC-EX supported hardware
-#endif
-
-static const byte RMT_CHAN_PER_DCC_CHAN = 2;
-
 // Number of bits resulting out of X bytes of DCC payload data
 // Each byte has one bit extra and at the end we have one EOF marker
 #define DATA_LEN(X) ((X)*9+1)
@@ -87,30 +75,12 @@ void IRAM_ATTR interrupt(rmt_channel_t channel, void *t) {
 RMTChannel::RMTChannel(pinpair pins, bool isMain) {
   byte ch;
   byte plen;
-
-  // Below we check if the DCC packet actually fits into the RMT hardware
-  // Currently MAX_PACKET_SIZE = 5 so with checksum there are
-  // MAX_PACKET_SIZE+1 data packets. Each need DATA_LEN (9) bits.
-  // To that we add the preamble length, the fencepost DCC end bit
-  // and the RMT EOF marker.
-  // SOC_RMT_MEM_WORDS_PER_CHANNEL is either 64 (original WROOM) or
-  // 48 (all other ESP32 like the -C3 or -S2
-  // The formula to get the possible MAX_PACKET_SIZE is
-  //
-  // ALLOCATED = RMT_CHAN_PER_DCC_CHAN * SOC_RMT_MEM_WORDS_PER_CHANNEL
-  // MAX_PACKET_SIZE = floor((ALLOCATED - PREAMBLE_LEN - 2)/9 - 1)
-  //
-
   if (isMain) {
     ch = 0;
     plen = PREAMBLE_BITS_MAIN;
-    static_assert (DATA_LEN(MAX_PACKET_SIZE+1) + PREAMBLE_BITS_MAIN + 2 <= RMT_CHAN_PER_DCC_CHAN * SOC_RMT_MEM_WORDS_PER_CHANNEL,
-		  "Number of DCC packet bits greater than ESP32 RMT memory available");
   } else {
-    ch = RMT_CHAN_PER_DCC_CHAN; // number == offset
+    ch = 2;
     plen = PREAMBLE_BITS_PROG;
-    static_assert (DATA_LEN(MAX_PACKET_SIZE+1) + PREAMBLE_BITS_PROG + 2 <= RMT_CHAN_PER_DCC_CHAN * SOC_RMT_MEM_WORDS_PER_CHANNEL,
-		   "Number of DCC packet bits greater than ESP32 RMT memory available");
   }
     
   // preamble
@@ -153,10 +123,20 @@ RMTChannel::RMTChannel(pinpair pins, bool isMain) {
   config.channel = channel = (rmt_channel_t)ch;
   config.clk_div = RMT_CLOCK_DIVIDER;
   config.gpio_num = (gpio_num_t)pins.pin;
-  config.mem_block_num = RMT_CHAN_PER_DCC_CHAN;
-  // use config
+  config.mem_block_num = 2; // With longest DCC packet 11 inc checksum (future expansion)
+                            // number of bits needed is 22preamble + start +
+                            // 11*9 + extrazero + EOT = 124
+                            // 2 mem block of 64 RMT items should be enough
+
   ESP_ERROR_CHECK(rmt_config(&config));
   addPin(pins.invpin, true);
+  /*
+  // test: config another gpio pin
+  gpio_num_t gpioNum = (gpio_num_t)(pin-1);
+  PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[gpioNum], PIN_FUNC_GPIO);
+  gpio_set_direction(gpioNum, GPIO_MODE_OUTPUT);
+  gpio_matrix_out(gpioNum, RMT_SIG_OUT0_IDX, 0, 0);
+  */
   
   // NOTE: ESP_INTR_FLAG_IRAM is *NOT* included in this bitmask
   ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, ESP_INTR_FLAG_LOWMED|ESP_INTR_FLAG_SHARED));

DCCWaveform.h

@@ -2,7 +2,7 @@
  *  © 2021 M Steve Todd
  *  © 2021 Mike S
  *  © 2021 Fred Decker
- *  © 2020-2024 Harald Barth
+ *  © 2020-2021 Harald Barth
  *  © 2020-2021 Chris Harlow
  *  All rights reserved.
  *  
@@ -33,9 +33,9 @@
 
 
 // Number of preamble bits.
-const byte PREAMBLE_BITS_MAIN = 16;
-const byte PREAMBLE_BITS_PROG = 22;
-const byte MAX_PACKET_SIZE = 5;     // NMRA standard extended packets, payload size WITHOUT checksum.
+const int   PREAMBLE_BITS_MAIN = 16;
+const int   PREAMBLE_BITS_PROG = 22;
+const byte   MAX_PACKET_SIZE = 5;  // NMRA standard extended packets, payload size WITHOUT checksum.
 
 
 // The WAVE_STATE enum is deliberately numbered because a change of order would be catastrophic

GITHUB_SHA.h

@@ -1 +1 @@
-#define GITHUB_SHA "devel-202401072123Z"
+#define GITHUB_SHA "devel-202401030135Z"

version.h

@@ -3,8 +3,7 @@
 
 #include "StringFormatter.h"
 
-#define VERSION "5.2.19"
-// 5.2.19 - ESP32: Determine if the RMT hardware can handle DCC
+#define VERSION "5.2.18"
 // 5.2.18 - Display network IP fix
 // 5.2.17 - ESP32 simplify network logic
 // 5.2.16 - Bugfix to allow for devices using the EX-IOExpander protocol to have no analogue or no digital pins