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FractionalLooper
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doozy

This commit is contained in:
pszsh 2026-03-07 10:43:28 -08:00
parent 56ca71523c
commit 316a138ee0
9 changed files with 221 additions and 125 deletions
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12
CMakeLists.txt
View File

@ -15,6 +15,7 @@ add_compile_definitions(PICO_RP2350A=0)
pico_sdk_init()
set(CS_MIDI_HID_MOUSE ON CACHE BOOL "" FORCE)
add_subdirectory(lib/cs-midi)
# cs_midi's BTstack sources need project-level btstack_config.h and lwipopts.h
@ -22,7 +23,6 @@ target_include_directories(cs_midi PRIVATE ${CMAKE_CURRENT_LIST_DIR})
add_executable(fractional_looper
main.cpp
src/encoder.cpp
src/spp_midi.cpp
)
@ -31,6 +31,12 @@ target_include_directories(fractional_looper PRIVATE
${CMAKE_CURRENT_LIST_DIR}/src
)
target_compile_definitions(fractional_looper PRIVATE
PICO_STDIO_USB_STDOUT_TIMEOUT_US=0
PICO_DEFAULT_UART_TX_PIN=12
PICO_DEFAULT_UART_RX_PIN=13
)
target_link_libraries(fractional_looper
pico_stdlib
pico_cyw43_arch_lwip_threadsafe_background
@ -42,7 +48,7 @@ target_link_libraries(fractional_looper
cs_midi
)
pico_enable_stdio_usb(fractional_looper 1)
pico_enable_stdio_uart(fractional_looper 0)
pico_enable_stdio_usb(fractional_looper 0)
pico_enable_stdio_uart(fractional_looper 1)
pico_add_extra_outputs(fractional_looper)

5
Makefile
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@ -6,7 +6,10 @@ all: $(BUILD_DIR)/Makefile
$(BUILD_DIR)/Makefile: CMakeLists.txt
@mkdir -p $(BUILD_DIR)
@cd $(BUILD_DIR) && PICO_SDK_PATH=$$HOME/Staging/pico-sdk cmake ..
@cd $(BUILD_DIR) && \
PICO_SDK_PATH=$$HOME/Staging/pico-sdk \
PICOTOOL_FETCH_FROM_GIT_PATH=$(CURDIR)/lib/cs-midi/tests/build/_deps \
cmake $(CURDIR)
clean:
@rm -f $(BUILD_DIR)/CMakeFiles/$(TARGET).dir/main.cpp.o

2
btstack_config.h
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@ -46,7 +46,7 @@
#define NVM_NUM_DEVICE_DB_ENTRIES 16
#define NVM_NUM_LINK_KEYS 16
#define MAX_ATT_DB_SIZE 512
#define MAX_ATT_DB_SIZE 1024
#define HAVE_EMBEDDED_TIME_MS
#define HAVE_ASSERT

22
lwipopts.h
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@ -1,22 +1,16 @@
#ifndef _LWIPOPTS_H
#define _LWIPOPTS_H
// Minimal — lwip linked by cs-midi's cyw43_arch but not used for networking
#define NO_SYS 1
#define LWIP_SOCKET 0
#define LWIP_NETCONN 0
#define LWIP_RAW 1
#define LWIP_DHCP 1
#define LWIP_DNS 1
#define LWIP_IGMP 1
#define LWIP_NETIF_HOSTNAME 1
#define LWIP_NETIF_STATUS_CALLBACK 1
#define LWIP_UDP 1
#define LWIP_TCP 1
#define MEM_SIZE 4096
#define MEMP_NUM_UDP_PCB 6
#define MEMP_NUM_TCP_PCB 4
#define LWIP_RAW 0
#define LWIP_DHCP 0
#define LWIP_DNS 0
#define LWIP_IGMP 0
#define LWIP_UDP 0
#define LWIP_TCP 0
#define MEM_SIZE 1024
#endif

150
main.cpp
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@ -1,131 +1,71 @@
#include <cstdio>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include "pico/btstack_flash_bank.h"
#include "btstack_tlv_flash_bank.h"
#include "hci.h"
#include "ble/le_device_db_tlv.h"
#include "classic/btstack_link_key_db_tlv.h"
#include <cs_midi.h>
#include "encoder.h"
#include "spp_midi.h"
// Two CC sets, toggled by SW1 button.
// Set A: encoders CC 16-19, buttons CC 20-22 (SW2-SW4)
// Set B: encoders CC 24-27, buttons CC 28-30 (SW2-SW4)
static constexpr uint8_t SET_A_ENC_CC = 16;
static constexpr uint8_t SET_A_BTN_CC = 20;
static constexpr uint8_t SET_B_ENC_CC = 24;
static constexpr uint8_t SET_B_BTN_CC = 28;
static constexpr uint8_t TOGGLE_CC = 23;
using namespace cs;
static uint8_t enc_cc_base = SET_A_ENC_CC;
static uint8_t btn_cc_base = SET_A_BTN_CC;
static bool set_b_active = false;
// SPP constructed first — its begin() registers Classic BT services before BLE starts HCI
SPPStreamMIDI_Interface spp_midi;
BluetoothMIDI_Interface ble_midi;
// LED state
enum LedState { LED_IDLE_BLINK, LED_CONNECT_FLASH, LED_OFF };
static LedState led_state = LED_IDLE_BLINK;
static uint16_t led_counter = 0;
static uint8_t led_flash_count = 0;
static bool was_connected = false;
// State toggle on encoder 1's button — fixed CC, sends 127/0 to indicate active map
CCButtonLatched toggle_btn {1, {80, Channel_1}};
static void led_set(bool on) {
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, on);
// Encoders (A/B swapped on hardware)
CCRotaryEncoder enc1 {{2, 0}, {16, Channel_1}, 1, 4};
CCRotaryEncoder enc2 {{5, 3}, {17, Channel_1}, 1, 4};
CCRotaryEncoder enc3 {{8, 6}, {18, Channel_1}, 1, 4};
CCRotaryEncoder enc4 {{9, 11}, {19, Channel_1}, 1, 4};
// Remaining encoder push buttons
CCButton btn2 {4, {20, Channel_1}};
CCButton btn3 {7, {21, Channel_1}};
CCButton btn4 {10, {22, Channel_1}};
// CC mappings per state
struct CCMap {
uint8_t enc[4];
uint8_t btn[3];
};
constexpr CCMap maps[2] = {
{{16, 17, 18, 19}, {20, 21, 22}}, // state 0
{{23, 24, 25, 26}, {27, 28, 29}}, // state 1
};
void apply_map(const CCMap &m) {
enc1.setAddress({m.enc[0], Channel_1});
enc2.setAddress({m.enc[1], Channel_1});
enc3.setAddress({m.enc[2], Channel_1});
enc4.setAddress({m.enc[3], Channel_1});
btn2.setAddressUnsafe({m.btn[0], Channel_1});
btn3.setAddressUnsafe({m.btn[1], Channel_1});
btn4.setAddressUnsafe({m.btn[2], Channel_1});
}
int main() {
stdio_init_all();
if (cyw43_arch_init()) {
printf("CYW43 init failed\n");
return 1;
}
printf("FractionalLooper: CYW43 initialized\n");
// Persistent bonding storage — survives power cycles
static btstack_tlv_flash_bank_t tlv_context;
const hal_flash_bank_t *flash_bank = pico_flash_bank_instance();
const btstack_tlv_t *tlv_impl = btstack_tlv_flash_bank_init_instance(
&tlv_context, flash_bank, NULL);
btstack_tlv_set_instance(tlv_impl, &tlv_context);
le_device_db_tlv_configure(tlv_impl, &tlv_context);
hci_set_link_key_db(btstack_link_key_db_tlv_get_instance(tlv_impl, &tlv_context));
RelativeCCSender::setMode(relativeCCmode::MACKIE_CONTROL_RELATIVE);
ble_midi.setName("FractionalLooper");
Control_Surface.begin();
cs::BluetoothMIDI_Interface ble;
ble.ble_settings.initiate_security = true;
ble.begin();
printf("BLE MIDI started\n");
SPPStreamMIDI_Interface spp;
spp.begin();
cs::BidirectionalMIDI_PipeFactory<2> pipes;
ble | pipes | spp;
encoders_init();
printf("Encoders initialized\n");
ble.setAsDefault();
bool last_state = false;
while (true) {
bool connected = ble.isConnected() || spp.isConnected();
if (connected && !was_connected) {
led_state = LED_CONNECT_FLASH;
led_flash_count = 0;
led_counter = 0;
} else if (!connected && was_connected) {
led_state = LED_IDLE_BLINK;
led_counter = 0;
}
was_connected = connected;
Control_Surface.loop();
switch (led_state) {
case LED_IDLE_BLINK:
led_set(led_counter < 500);
if (++led_counter >= 1000) led_counter = 0;
break;
case LED_CONNECT_FLASH:
led_set(led_counter < 50);
if (++led_counter >= 100) {
led_counter = 0;
if (++led_flash_count >= 6) {
led_state = LED_OFF;
led_set(false);
bool state = toggle_btn.getState();
if (state != last_state) {
last_state = state;
apply_map(maps[state]);
}
}
break;
case LED_OFF:
break;
}
for (int i = 0; i < NUM_ENCODERS; i++) {
int32_t delta = encoder_get_delta(i);
if (delta != 0) {
int32_t clamped = delta;
if (clamped > 63) clamped = 63;
if (clamped < -63) clamped = -63;
uint8_t val = (clamped > 0) ? (uint8_t)clamped
: (uint8_t)(128 + clamped);
ble.sendControlChange({enc_cc_base + i, cs::Channel_1}, val);
}
if (button_pressed(i)) {
if (i == 0) {
set_b_active = !set_b_active;
enc_cc_base = set_b_active ? SET_B_ENC_CC : SET_A_ENC_CC;
btn_cc_base = set_b_active ? SET_B_BTN_CC : SET_A_BTN_CC;
ble.sendControlChange({TOGGLE_CC, cs::Channel_1},
set_b_active ? 127 : 0);
} else {
ble.sendControlChange({btn_cc_base + (i - 1), cs::Channel_1}, 127);
}
}
}
ble.update();
spp.update();
sleep_ms(1);
}

1
make.sh Executable file
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@ -0,0 +1 @@
make clean && make && make flash

11
tools/uart_bridge/CMakeLists.txt Normal file
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@ -0,0 +1,11 @@
cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
project(uart_bridge C CXX ASM)
set(CMAKE_C_STANDARD 11)
pico_sdk_init()
add_executable(uart_bridge main.c)
target_link_libraries(uart_bridge pico_stdlib)
pico_enable_stdio_usb(uart_bridge 1)
pico_enable_stdio_uart(uart_bridge 0)
pico_add_extra_outputs(uart_bridge)

21
tools/uart_bridge/main.c Normal file
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@ -0,0 +1,21 @@
// UART-to-USB CDC bridge for Pico
// UART0 RX on GPIO 1, 115200 baud → USB serial output
#include "pico/stdlib.h"
#include <stdio.h>
#define UART_ID uart0
#define UART_RX_PIN 1
#define BAUD 115200
int main() {
stdio_init_all();
uart_init(UART_ID, BAUD);
gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
while (true) {
if (uart_is_readable(UART_ID)) {
char c = uart_getc(UART_ID);
putchar(c);
}
}
}

120
tools/uart_bridge/pico_sdk_import.cmake Normal file
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@ -0,0 +1,120 @@
# 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()
# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
# following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
# disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
endif ()
if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
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 "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for 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 ()
FetchContent_Declare(
pico_sdk
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
)
if (NOT pico_sdk)
message("Downloading Raspberry Pi Pico SDK")
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
FetchContent_Populate(
pico_sdk
QUIET
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
GIT_SUBMODULES_RECURSE FALSE
SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
)
else ()
FetchContent_Populate(
pico_sdk
QUIET
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
)
endif ()
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})