Pico Tuner

Author: dkdps

pico-tuner/BuzzerExample.c

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+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/gpio.h"
+#include "hardware/pwm.h"
+
+#define TOGGLE 20
+#define CHANGE_NOTE 21
+
+int notes[6] = {
+    82, // E
+    110, // A
+    147, // D
+    196, // G
+    246, // B
+    330 // e
+};
+
+// https://www.i-programmer.info/programming/hardware/14849-the-pico-in-c-basic-pwm.html?start=2
+uint32_t pwm_set_freq_duty(uint slice_num,
+       uint chan,uint32_t f, int d)
+{
+ uint32_t clock = 125000000;
+ uint32_t divider16 = clock / f / 4096 + 
+                           (clock % (f * 4096) != 0);
+ if (divider16 / 16 == 0)
+ divider16 = 16;
+ uint32_t wrap = clock * 16 / divider16 / f - 1;
+ pwm_set_clkdiv_int_frac(slice_num, divider16/16,
+                                     divider16 & 0xF);
+ pwm_set_wrap(slice_num, wrap);
+ pwm_set_chan_level(slice_num, chan, wrap * d / 100);
+ return wrap;
+}
+
+int main()
+{
+    // Init
+    stdio_init_all();
+    gpio_init(TOGGLE);
+    gpio_init(CHANGE_NOTE);
+    
+    gpio_set_dir(TOGGLE,GPIO_IN);
+    gpio_set_dir(CHANGE_NOTE,GPIO_IN);
+
+    gpio_pull_up(TOGGLE);
+    gpio_pull_up(CHANGE_NOTE);
+
+    gpio_set_function(18, GPIO_FUNC_PWM);
+    
+
+    uint slice_num = pwm_gpio_to_slice_num(18);
+    uint chan = pwm_gpio_to_channel(18);
+    uint play = 0;
+    uint tone = 0;
+
+    while (true)
+    {
+        if(!gpio_get(TOGGLE)){
+            play = 1 - play;
+            sleep_ms(300);
+        }
+
+        if(!gpio_get(CHANGE_NOTE)){
+
+            tone = (tone+1)%6;
+
+            pwm_set_freq_duty(slice_num,chan,notes[tone],50);
+            sleep_ms(500);
+        }
+
+        if(play){
+            // Set the PWM running
+            pwm_set_enabled(slice_num, true);
+        } else{
+            pwm_set_enabled(slice_num, false);
+        }
+
+    }
+
+    return 0;
+}
+

pico-tuner/CMakeLists.txt

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+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# Initialise pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+set(PICO_SDK_PATH "/mnt/c/Users/champ/Documents/Programming/pico-sdk")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+project(BuzzerExample C CXX ASM)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(BuzzerExample BuzzerExample.c )
+
+pico_set_program_name(BuzzerExample "BuzzerExample")
+pico_set_program_version(BuzzerExample "0.1")
+
+pico_enable_stdio_uart(BuzzerExample 1)
+pico_enable_stdio_usb(BuzzerExample 0)
+
+# Add the standard library to the build
+target_link_libraries(BuzzerExample pico_stdlib)
+
+# Add any user requested libraries
+target_link_libraries(BuzzerExample
+        hardware_gpio hardware_pwm
+        )
+
+pico_add_extra_outputs(BuzzerExample)
+