From 02139416b167ea0b862da82377d3c65a3e4d65f5 Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Sat, 28 Jan 2023 10:39:55 -0600
Subject: [PATCH] add helper functions to convert between bpm and ms

---
 main/esp32-sequencer.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/main/esp32-sequencer.c b/main/esp32-sequencer.c
index 522a84e..ca6dfca 100644
--- a/main/esp32-sequencer.c
+++ b/main/esp32-sequencer.c
@@ -25,6 +25,7 @@
 
 /* Controls */
 #define GPIO_MUTATE_BTN (9) // Mutate Button In
+#define GPIO_TAP_TEMPO_BTN (10) // Tap Tempo Button In
 
 static QueueHandle_t control_event_queue = NULL;
 
@@ -45,8 +46,18 @@ gptimer_handle_t gate_blink_timer = NULL;
 uint8_t sequence[SEQ_MAX_LEN] = {0};
 uint8_t seq_len = SEQ_MAX_LEN;
 
+static const uint32_t DEFAULT_BPM = 120;
+
 static const char *TAG = "sequencer";
 
+uint32_t bpm_to_ms(uint32_t bpm) {
+  return 60000 / bpm;
+}
+
+uint32_t ms_to_bpm(uint32_t ms) {
+  return 60000 / ms;
+}
+
 static void randomize_seq(uint8_t *sequence) {
   for (uint8_t i = 0; i < SEQ_MAX_LEN; i++) {
     sequence[i] = esp_random() % 2;
@@ -73,7 +84,7 @@ static void control_event_handler(void* arg) {
   uint32_t gpio_num;
   while (1) {
     if(xQueueReceive(control_event_queue, &gpio_num, portMAX_DELAY)) {
-      ESP_LOGI(TAG, "Handling control from %" PRIu32 , gpio_num);
+      ESP_LOGI(TAG, "Handling control from GPIO %" PRIu32 , gpio_num);
       switch (gpio_num) {
       case GPIO_MUTATE_BTN:
         mutate_seq(sequence);
@@ -91,6 +102,13 @@ static void controls_init(void) {
   gpio_set_intr_type(GPIO_MUTATE_BTN, GPIO_INTR_NEGEDGE);
   // Hook in handler for mutate button
   gpio_isr_handler_add(GPIO_MUTATE_BTN, gpio_isr_handler, (void*)GPIO_MUTATE_BTN);
+
+  // Setup tap tempo Button
+  gpio_reset_pin(GPIO_TAP_TEMPO_BTN);
+  gpio_set_direction(GPIO_TAP_TEMPO_BTN, GPIO_MODE_INPUT);
+  gpio_set_intr_type(GPIO_TAP_TEMPO_BTN, GPIO_INTR_NEGEDGE);
+  // Hook in handler for tap tempo button
+  gpio_isr_handler_add(GPIO_TAP_TEMPO_BTN, gpio_isr_handler, (void *)GPIO_TAP_TEMPO_BTN);
 }
 
 static void clk_cv_off_alarm_cb(gptimer_handle_t timer, const gptimer_alarm_event_data_t *edata, void *user_data) {
@@ -270,7 +288,7 @@ void app_main(void) {
         blink_led(LEDC_CHANNEL_1); // blink gate triggered led
       }
       printf("%i", sequence[step]);
-      vTaskDelay(500 / portTICK_PERIOD_MS);
+      vTaskDelay(bpm_to_ms(DEFAULT_BPM)/ portTICK_PERIOD_MS);
     }
     printf("\n");