From a5a81a6d5c91461daeff95f02bab4eabb80315d5 Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Sun, 5 Feb 2023 00:37:05 -0600
Subject: [PATCH] Feat: add tracker under sequence to display current step

---
 main/esp32-sequencer.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/main/esp32-sequencer.c b/main/esp32-sequencer.c
index 8e32652..4199a7b 100644
--- a/main/esp32-sequencer.c
+++ b/main/esp32-sequencer.c
@@ -93,6 +93,7 @@ lv_obj_t * bpm_label = NULL;
 static uint8_t sequence[SEQ_MAX_LEN] = {0};
 static uint8_t seq_len = SEQ_MAX_LEN;
 lv_obj_t * sequence_label = NULL;
+lv_obj_t * sequence_tracker = NULL;
 
 static const char *TAG = "sequencer";
 
@@ -452,6 +453,12 @@ static void gui_create(void) {
   lv_label_set_text(sequence_label, "oooooooo");
   lv_obj_add_style(sequence_label, &gui_style, LV_STATE_DEFAULT);
   lv_obj_align(sequence_label, LV_ALIGN_CENTER, 0, 0);
+
+  // Create sequence tracker text area
+  sequence_tracker = lv_label_create(lv_scr_act());
+  lv_obj_add_style(sequence_tracker, &gui_style, LV_STATE_DEFAULT);
+  lv_label_set_text(sequence_tracker, "_        ");
+  lv_obj_align(sequence_tracker, LV_ALIGN_CENTER, 0, 5); // slightly lower than main sequence
 }
 
 static void gui_task(void *pvParameter) {
@@ -494,7 +501,19 @@ void app_main(void) {
 
   /* Main Loop */
   while (1) {
+    char  tracker_str[seq_len];
     for (uint8_t step = 0; step < seq_len; step++) {
+      // advance step tracker
+      if (step == 0) {
+        tracker_str[seq_len - 1] = ' ';
+      } else {
+        tracker_str[step - 1] = ' ';
+      }
+      tracker_str[step] = '_';
+
+      // set the new sequence label
+      lv_label_set_text(sequence_tracker, tracker_str);
+
       // if step has been set for sequence
       if (sequence[step] == 1) {
         pulse_cv(true);