CMakeLists.txt

@@ -19,6 +19,7 @@ add_executable(vibe-check
     src/main.c
     src/state.c
     src/vibe_bt.c
+    src/buttons.c
 )
 
 target_link_libraries(vibe-check

src/buttons.c

@@ -0,0 +1,78 @@
+#include "buttons.h"
+#include "btstack.h"
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+#include "state.h"
+#include "vibe_bt.h"
+#include <stdio.h>
+
+#define POLL_PERIOD_MS 100
+
+#define BUTTON_PIN_POWER 20
+#define BUTTON_PIN_PLUS 19
+#define BUTTON_PIN_MINUS 18
+
+#define BUTTON_STEP 25
+
+static btstack_timer_source_t button_timer;
+
+// What power do we return to when the power button is pressed while off?
+static uint8_t resume_power = 50;
+
+static void button_timer_callback(struct btstack_timer_source* ts) {
+	// TODO: Debounce this.
+	if (gpio_get(BUTTON_PIN_POWER)) {
+		if (bt_connected) {
+			printf("=> Ignoring input, bluetooth connected.\n");
+		} else if (target_power == 0) {
+			printf("= Resuming:   %i%% -> %i%%\n", target_power, resume_power);
+			state_set_power(resume_power);
+		} else {
+			printf("= Suspending: %i%% -> %i%%\n", target_power, resume_power);
+			resume_power = target_power;
+			state_set_power(0);
+		}
+	}
+
+	if (gpio_get(BUTTON_PIN_PLUS)) {
+		if (bt_connected) {
+			printf("+> Ignoring input, bluetooth connected.\n");
+		} else if (target_power <= (100 - BUTTON_STEP)) {
+			printf("+ Increasing power: %i%% -> %i%%\n", target_power, target_power + BUTTON_STEP);
+			state_set_power(target_power + BUTTON_STEP);
+		} else {
+			printf("+ Increasing power: %i%% -> %i%%\n", target_power, 100);
+			state_set_power(100);
+		}
+	}
+	if (gpio_get(BUTTON_PIN_MINUS)) {
+		if (bt_connected) {
+			printf("-> Ignoring input, bluetooth connected.\n");
+		} else if (target_power >= BUTTON_STEP) {
+			printf("- Reducing power: %i%% -> %i%%\n", target_power, target_power - BUTTON_STEP);
+			state_set_power(target_power - BUTTON_STEP);
+		} else {
+			printf("- Reducing power: %i%% -> %i%%\n", target_power, 0);
+			state_set_power(0);
+		}
+	}
+
+	btstack_run_loop_set_timer(ts, POLL_PERIOD_MS);
+	btstack_run_loop_add_timer(ts);
+}
+
+void buttons_init() {
+	gpio_set_dir(BUTTON_PIN_POWER, GPIO_IN);
+	gpio_set_dir(BUTTON_PIN_PLUS, GPIO_IN);
+	gpio_set_dir(BUTTON_PIN_MINUS, GPIO_IN);
+
+	button_timer.process = button_timer_callback;
+	button_timer.process(&button_timer);
+
+	// Why do these not trigger??
+	// printf("Setting interrupts for buttons...\n");
+	// gpio_set_irq_callback(button_callback);
+	// gpio_set_irq_enabled(BUTTON_PIN_POWER, BUTTON_EVENTS, true);
+	// gpio_set_irq_enabled(BUTTON_PIN_PLUS, BUTTON_EVENTS, true);
+	// gpio_set_irq_enabled(BUTTON_PIN_MINUS, BUTTON_EVENTS, true);
+}

src/buttons.h

@@ -0,0 +1,6 @@
+#ifndef BUTTONS_H
+#define BUTTONS_H
+
+void buttons_init();
+
+#endif

src/main.c

@@ -1,4 +1,5 @@
 #include "btstack.h"
+#include "buttons.h"
 #include "hci_dump.h"
 #include "hci_dump_segger_rtt_stdout.h"
 #include "pico/btstack_cyw43.h"
@@ -46,6 +47,9 @@ int main() {
 	// set initial state
 	state_init();
 
+	// hook up buttons
+	buttons_init();
+
 	att_server_init(profile_data, bt_att_read_callback, bt_att_write_callback);
 
 	hci_event_callback_registration.callback = &bt_packet_handler;

src/state.c

@@ -8,28 +8,26 @@
 
 static int pwm_slice = 0;
 
-// Note: These are all in % of a %, eg. 100% = 10000.
+uint8_t current_power = 0;
-uint16_t current_power = 0;
+uint8_t target_power = 0;
-uint16_t target_power = 0;
 
-#define RAMP_PERIOD_MS 1
+#define RAMP_PERIOD_MS 100
-#define RAMP_STEP_UP 200
+#define RAMP_STEP 50
-#define RAMP_STEP_DOWN 50
 
 // Timer and callback for ramping power. Jumping ~50% power or more in one go kills the
 // chip with electrical ripples, so be a bit gentle about it.
 static btstack_timer_source_t ramp_timer;
 static void ramp_timer_callback(struct btstack_timer_source* ts) {
 	if (current_power != target_power) {
-		if (current_power < target_power - RAMP_STEP_UP) {
+		if (current_power < target_power - RAMP_STEP) {
-			current_power += RAMP_STEP_UP;
+			current_power += RAMP_STEP;
-		} else if (current_power > target_power + RAMP_STEP_DOWN) {
+		} else if (current_power > target_power + RAMP_STEP) {
-			current_power -= RAMP_STEP_DOWN;
+			current_power -= RAMP_STEP;
 		} else {
 			current_power = target_power;
 		}
-		pwm_set_chan_level(pwm_slice, PWM_CHAN_A, current_power / 100);
+		pwm_set_chan_level(pwm_slice, PWM_CHAN_A, current_power);
-		pwm_set_chan_level(pwm_slice, PWM_CHAN_B, current_power / 100);
+		pwm_set_chan_level(pwm_slice, PWM_CHAN_B, current_power);
 	}
 
 	btstack_run_loop_set_timer(ts, RAMP_PERIOD_MS);
@@ -54,5 +52,5 @@ void state_set_power(uint8_t power) {
 	if (power > 100) {
 		power = 100;
 	}
-	target_power = power * 100;
+	target_power = power;
 }

src/state.h

@@ -3,6 +3,11 @@
 
 #include <stdint.h>
 
+// Current power level, 0-100.
+extern uint8_t current_power;
+// Target power level (that we're ramping to), 0-100.
+extern uint8_t target_power;
+
 // Initialize wand state.
 void state_init();