From 37d6a701bcba876691ae894b3898ed424796a856 Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Fri, 27 Jan 2023 19:00:57 -0600
Subject: [PATCH] add function to mutate sequence

---
 main/esp32-sequencer.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/main/esp32-sequencer.c b/main/esp32-sequencer.c
index e6c10c7..fa4c0e6 100644
--- a/main/esp32-sequencer.c
+++ b/main/esp32-sequencer.c
@@ -181,12 +181,22 @@ static void pulse_cv(uint8_t gpio_num) {
   }
 }
 
-static void gen_rand_seq(uint8_t *sequence) {
+static void randomize_seq(uint8_t *sequence) {
   for (uint8_t i = 0; i < SEQ_MAX_LEN; i++) {
     sequence[i] = esp_random() % 2;
   }
 }
 
+static void mutate_seq(uint8_t *sequence) {
+  // pick a step to mutate
+  uint8_t step = esp_random() % SEQ_MAX_LEN;
+  if (sequence[step] == 1) {
+    sequence[step] = 0;
+  } else if (sequence[step] == 0) {
+    sequence[step] = 1;
+  }
+}
+
 void app_main(void) {
   /* Initialize Peripherals */
   /* Initialize GPIO */
@@ -196,6 +206,7 @@ void app_main(void) {
   /* Initialize sequence */
   uint8_t sequence[SEQ_MAX_LEN] = {0};
   uint8_t seq_len = SEQ_MAX_LEN;
+  randomize_seq(sequence);
 
   /* Main Loop */
   while (1) {
@@ -212,7 +223,7 @@ void app_main(void) {
       printf("%i", sequence[step]);
       vTaskDelay(500 / portTICK_PERIOD_MS);
     }
-    gen_rand_seq(sequence);
+    mutate_seq(sequence);
     printf("\n");
 
   }