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FractionalLooper
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initial scaffold: RP2350B + CYW43 project skeleton

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pszsh 2026-03-02 21:51:18 -08:00
commit f99bf04f1a
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35
CMakeLists.txt Normal file
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set(PICO_BOARD waveshare_rp2350b_plus_w)
set(PICO_BOARD_HEADER_DIRS ${CMAKE_CURRENT_LIST_DIR}/boards)
cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
project(fractional_looper C CXX ASM)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)
set(PICO_PLATFORM rp2350-arm-s)
add_compile_definitions(PICO_RP2350A=0)
pico_sdk_init()
add_executable(fractional_looper
main.c
)
target_include_directories(fractional_looper PRIVATE ${CMAKE_CURRENT_LIST_DIR})
target_link_libraries(fractional_looper
pico_stdlib
pico_cyw43_arch_lwip_threadsafe_background
pico_btstack_ble
pico_btstack_cyw43
hardware_adc
)
pico_enable_stdio_usb(fractional_looper 1)
pico_enable_stdio_uart(fractional_looper 0)
pico_add_extra_outputs(fractional_looper)

21
Makefile Normal file
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BUILD_DIR = build
TARGET = fractional_looper
all: $(BUILD_DIR)/Makefile
@$(MAKE) -C $(BUILD_DIR)
$(BUILD_DIR)/Makefile: CMakeLists.txt
@mkdir -p $(BUILD_DIR)
@cd $(BUILD_DIR) && PICO_SDK_PATH=$$HOME/Staging/pico-sdk cmake ..
clean:
@rm -rf $(BUILD_DIR)
flash: all
@echo "Waiting for RP2350 volume..."
@while [ ! -d /Volumes/RP2350 ]; do sleep 0.1; done
@echo "Flashing..."
@cp $(BUILD_DIR)/$(TARGET).uf2 /Volumes/RP2350/
@echo "Done."
.PHONY: all clean flash

126
boards/waveshare_rp2350b_plus_w.h Normal file
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#ifndef _BOARDS_WAVESHARE_RP2350B_PLUS_W_H
#define _BOARDS_WAVESHARE_RP2350B_PLUS_W_H
pico_board_cmake_set(PICO_PLATFORM, rp2350)
pico_board_cmake_set(PICO_CYW43_SUPPORTED, 1)
#define WAVESHARE_RP2350B_PLUS_W
// --- RP2350 VARIANT ---
#define PICO_RP2350A 0
// --- UART ---
#ifndef PICO_DEFAULT_UART
#define PICO_DEFAULT_UART 0
#endif
#ifndef PICO_DEFAULT_UART_TX_PIN
#define PICO_DEFAULT_UART_TX_PIN 0
#endif
#ifndef PICO_DEFAULT_UART_RX_PIN
#define PICO_DEFAULT_UART_RX_PIN 1
#endif
// --- LED ---
#ifndef PICO_DEFAULT_LED_PIN
#define PICO_DEFAULT_LED_PIN 23
#endif
// --- I2C ---
#ifndef PICO_DEFAULT_I2C
#define PICO_DEFAULT_I2C 1
#endif
#ifndef PICO_DEFAULT_I2C_SDA_PIN
#define PICO_DEFAULT_I2C_SDA_PIN 6
#endif
#ifndef PICO_DEFAULT_I2C_SCL_PIN
#define PICO_DEFAULT_I2C_SCL_PIN 7
#endif
// --- SPI ---
#ifndef PICO_DEFAULT_SPI
#define PICO_DEFAULT_SPI 0
#endif
#ifndef PICO_DEFAULT_SPI_SCK_PIN
#define PICO_DEFAULT_SPI_SCK_PIN 18
#endif
#ifndef PICO_DEFAULT_SPI_TX_PIN
#define PICO_DEFAULT_SPI_TX_PIN 19
#endif
#ifndef PICO_DEFAULT_SPI_RX_PIN
#define PICO_DEFAULT_SPI_RX_PIN 16
#endif
#ifndef PICO_DEFAULT_SPI_CSN_PIN
#define PICO_DEFAULT_SPI_CSN_PIN 17
#endif
// --- FLASH ---
#define PICO_BOOT_STAGE2_CHOOSE_W25Q080 1
#ifndef PICO_FLASH_SPI_CLKDIV
#define PICO_FLASH_SPI_CLKDIV 2
#endif
pico_board_cmake_set_default(PICO_FLASH_SIZE_BYTES, (16 * 1024 * 1024))
#ifndef PICO_FLASH_SIZE_BYTES
#define PICO_FLASH_SIZE_BYTES (16 * 1024 * 1024)
#endif
// --- CYW43 (RM2) on B-package extra pins ---
#ifndef CYW43_WL_GPIO_COUNT
#define CYW43_WL_GPIO_COUNT 3
#endif
#ifndef CYW43_WL_GPIO_LED_PIN
#define CYW43_WL_GPIO_LED_PIN 0
#endif
#ifndef CYW43_WL_GPIO_SMPS_PIN
#define CYW43_WL_GPIO_SMPS_PIN 1
#endif
#ifndef CYW43_WL_GPIO_VBUS_PIN
#define CYW43_WL_GPIO_VBUS_PIN 2
#endif
#ifndef CYW43_USES_VSYS_PIN
#define CYW43_USES_VSYS_PIN 1
#endif
#ifndef PICO_VSYS_PIN
#define PICO_VSYS_PIN 29
#endif
#ifndef CYW43_PIN_WL_DYNAMIC
#define CYW43_PIN_WL_DYNAMIC 0
#endif
#ifndef CYW43_DEFAULT_PIN_WL_REG_ON
#define CYW43_DEFAULT_PIN_WL_REG_ON 36u
#endif
#ifndef CYW43_DEFAULT_PIN_WL_DATA_OUT
#define CYW43_DEFAULT_PIN_WL_DATA_OUT 37u
#endif
#ifndef CYW43_DEFAULT_PIN_WL_DATA_IN
#define CYW43_DEFAULT_PIN_WL_DATA_IN 37u
#endif
#ifndef CYW43_DEFAULT_PIN_WL_HOST_WAKE
#define CYW43_DEFAULT_PIN_WL_HOST_WAKE 37u
#endif
#ifndef CYW43_DEFAULT_PIN_WL_CLOCK
#define CYW43_DEFAULT_PIN_WL_CLOCK 39u
#endif
#ifndef CYW43_DEFAULT_PIN_WL_CS
#define CYW43_DEFAULT_PIN_WL_CS 38u
#endif
pico_board_cmake_set_default(PICO_RP2350_A2_SUPPORTED, 1)
#ifndef PICO_RP2350_A2_SUPPORTED
#define PICO_RP2350_A2_SUPPORTED 1
#endif
#endif

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btstack_config.h Normal file
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#ifndef _BTSTACK_CONFIG_H
#define _BTSTACK_CONFIG_H
#define ENABLE_LE_PERIPHERAL
#define ENABLE_LE_CENTRAL
#define ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE
#define ENABLE_PRINTF_HEXDUMP
#define HCI_OUTGOING_PRE_BUFFER_SIZE 4
#define HCI_ACL_PAYLOAD_SIZE (1691 + 4)
#define HCI_ACL_CHUNK_SIZE_ALIGNMENT 4
#define MAX_NR_BTSTACK_LINK_KEY_DB_MEMORY_ENTRIES 2
#define MAX_NR_GATT_CLIENTS 1
#define MAX_NR_HCI_CONNECTIONS 2
#define MAX_NR_L2CAP_CHANNELS 4
#define MAX_NR_L2CAP_SERVICES 3
#define MAX_NR_SM_LOOKUP_ENTRIES 3
#define MAX_NR_WHITELIST_ENTRIES 1
#define MAX_NR_LE_DEVICE_DB_ENTRIES 4
#define MAX_NR_CONTROLLER_ACL_BUFFERS 3
#define MAX_NR_CONTROLLER_SCO_PACKETS 3
#define ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
#define HCI_HOST_ACL_PACKET_LEN 1024
#define HCI_HOST_ACL_PACKET_NUM 3
#define HCI_HOST_SCO_PACKET_LEN 120
#define HCI_HOST_SCO_PACKET_NUM 3
#define NVM_NUM_DEVICE_DB_ENTRIES 16
#define NVM_NUM_LINK_KEYS 16
#define MAX_ATT_DB_SIZE 512
#define HAVE_EMBEDDED_TIME_MS
#define HAVE_ASSERT
#define ENABLE_SOFTWARE_AES128
#define ENABLE_MICRO_ECC_FOR_LE_SECURE_CONNECTIONS
#endif

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lwipopts.h Normal file
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#ifndef _LWIPOPTS_H
#define _LWIPOPTS_H
#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
#endif

23
main.c Normal file
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#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
int main(void) {
stdio_init_all();
if (cyw43_arch_init()) {
printf("CYW43 init failed\n");
return 1;
}
printf("FractionalLooper: CYW43 initialized\n");
while (1) {
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
sleep_ms(500);
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
sleep_ms(500);
}
return 0;
}

120
pico_sdk_import.cmake Normal file
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# 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})