Added RP2040 app

rp2040/CMakeLists.txt

@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.13)
+
+# initialize the SDK based on PICO_SDK_PATH
+# note: this must happen before project()
+include(pico_sdk_import.cmake)
+
+project(pico_chimes)
+
+# initialize the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+include_directories(../include)
+
+add_executable(chimes
+        main.c
+        ../src/chimes.c
+        )
+
+target_link_libraries(chimes
+        pico_multicore
+        pico_stdlib
+        hardware_dma
+        hardware_pio
+        hardware_timer
+        hardware_clocks
+        hardware_pwm)
+
+pico_add_extra_outputs(chimes)
+
+
+
+

rp2040/main.c

@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <time.h>
+
+#include "pico/stdlib.h"
+#include "pico/util/queue.h"
+#include "pico/multicore.h"
+#include "pico/sem.h"
+
+#include "hardware/irq.h"
+#include "hardware/pwm.h"
+#include "hardware/sync.h"
+
+#include "chimes.h"
+
+#define BUFF_SIZE (SAMPLERATE)
+#define AUDIO_PIN (28)
+#define FCPU (266000000UL)
+#define PWM_MULT (8)
+
+static queue_t results_queue;
+static struct semaphore pwm_end_sem;
+
+static uint16_t outputBuffer[2][BUFF_SIZE];
+static uint16_t *volatile buf_p;
+
+static void pwm_interrupt_handler()
+{
+    static size_t pos = 0;
+    static uint8_t div = PWM_MULT;
+
+    pwm_clear_irq(pwm_gpio_to_slice_num(AUDIO_PIN));
+
+    pwm_set_gpio_level(AUDIO_PIN, buf_p[pos / PWM_MULT]);
+    pos++;
+    if (pos >= (BUFF_SIZE * PWM_MULT))
+    {
+        pos = 0;
+        sem_release(&pwm_end_sem);
+    }
+}
+
+static void core1_entry()
+{
+    float sample;
+    size_t n = 0;
+
+    chime_t *chime = chime_init();
+    assert(chime);
+
+    const uint LED_PIN = PICO_DEFAULT_LED_PIN;
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+
+    while (1)
+    {
+        gpio_put(LED_PIN, 1);
+        for (size_t i = 0; i < BUFF_SIZE; i++)
+        {
+            sample = chime_update(chime);
+            if (chime_is_finished(chime))
+            {
+                chime = chime_init();
+            }
+            outputBuffer[n][i] = (sample + 1.0) * 80;
+        }
+        uint16_t *data = outputBuffer[n];
+        gpio_put(LED_PIN, 0);
+        queue_add_blocking(&results_queue, &data);
+        n ^= 1;
+    }
+}
+
+int main()
+{
+    uint16_t *data;
+
+    srand(time(NULL));
+    set_sys_clock_khz(FCPU / 1000, true);
+
+    queue_init(&results_queue, sizeof(uint16_t *), 1);
+    sem_init(&pwm_end_sem, 0, 1);
+
+    gpio_set_function(AUDIO_PIN, GPIO_FUNC_PWM);
+
+    int audio_pin_slice = pwm_gpio_to_slice_num(AUDIO_PIN);
+
+    // Setup PWM interrupt to fire when PWM cycle is complete
+    pwm_clear_irq(audio_pin_slice);
+    pwm_set_irq_enabled(audio_pin_slice, true);
+    // set the handle function above
+    irq_set_exclusive_handler(PWM_IRQ_WRAP, pwm_interrupt_handler);
+    irq_set_enabled(PWM_IRQ_WRAP, true);
+
+    pwm_config config = pwm_get_default_config();
+
+    pwm_config_set_clkdiv(&config, (1.0 * FCPU / (250 * (PWM_MULT - 1) * SAMPLERATE)));
+    pwm_config_set_wrap(&config, 250);
+
+    pwm_set_gpio_level(AUDIO_PIN, 0);
+
+    multicore_launch_core1(core1_entry);
+
+    queue_peek_blocking(&results_queue, &data);
+    buf_p = data;
+    pwm_init(audio_pin_slice, &config, true);
+
+    while (1)
+    {
+        sem_acquire_blocking(&pwm_end_sem);
+        queue_remove_blocking(&results_queue, &data);
+        queue_peek_blocking(&results_queue, &data);
+        buf_p = data;
+    }
+}

rp2040/pico_sdk_import.cmake

@@ -0,0 +1,73 @@
+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})