init
This commit is contained in:
commit
32f4d1057b
1
.gitignore
vendored
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1
.gitignore
vendored
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.vscode
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57
CMakeLists.txt
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57
CMakeLists.txt
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# Generated Cmake Pico project file
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cmake_minimum_required(VERSION 3.13)
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set(CMAKE_C_STANDARD 11)
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set(CMAKE_CXX_STANDARD 17)
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# Initialise pico_sdk from installed location
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# (note this can come from environment, CMake cache etc)
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set(PICO_SDK_PATH "/usr/share/pico-sdk")
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set(PICO_BOARD pico_w CACHE STRING "Board type")
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# Pull in Raspberry Pi Pico SDK (must be before project)
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include(pico_sdk_import.cmake)
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if (PICO_SDK_VERSION_STRING VERSION_LESS "1.4.0")
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message(FATAL_ERROR "Raspberry Pi Pico SDK version 1.4.0 (or later) required. Your version is ${PICO_SDK_VERSION_STRING}")
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endif()
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project(ARGB_emulator C CXX ASM)
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# Initialise the Raspberry Pi Pico SDK
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pico_sdk_init()
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# Add executable. Default name is the project name, version 0.1
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add_executable(ARGB_emulator main.cpp tx_rx.cpp)
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pico_set_program_name(ARGB_emulator "ARGB_emulator")
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pico_set_program_version(ARGB_emulator "0.1")
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pico_enable_stdio_uart(ARGB_emulator 0)
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pico_enable_stdio_usb(ARGB_emulator 1)
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pico_generate_pio_header(argb_emulator ${CMAKE_CURRENT_SOURCE_DIR}/argb_tx.pio)
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# Add the standard library to the build
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target_link_libraries(ARGB_emulator
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pico_stdlib)
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# Add the standard include files to the build
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target_include_directories(ARGB_emulator PRIVATE
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${CMAKE_CURRENT_LIST_DIR}
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${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts or any other standard includes, if required
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)
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# Add any user requested libraries
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target_link_libraries(ARGB_emulator
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hardware_pio
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hardware_dma
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pico_cyw43_arch_none
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)
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pico_add_extra_outputs(ARGB_emulator)
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43
argb_tx.pio
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43
argb_tx.pio
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.program argb_tx
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.side_set 1 opt
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.wrap_target
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pull ; Get data from FIFO
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mov y, osr ; Store bit count in Y (lower 8 bits)
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pull ; Get first data word
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mov x, osr ; Store in X
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set y, 24 ; Remaining bits in first word (32-8)
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bit_loop:
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out pins, 1 ; Shift 1 bit to pins (side-set 0)
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jmp y--, delay ; Decrement Y, handle delay
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pull ; Load new data when Y underflows
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mov x, osr
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set y, 31 ; Reset bit counter for new word
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delay:
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jmp x--, nobit ; Check if current bit is set [1]
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nop ; [1] Align timing
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; Bit=1 pattern (0.8µs high, 0.45µs low)
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set pins, 1 [99] ; 1 + 99 = 100 cycles (0.8µs)
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set pins, 0 [55] ; 1 + 55 = 56 cycles (0.448µs)
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jmp end_bit
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nobit:
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; Bit=0 pattern (0.4µs high, 0.85µs low)
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set pins, 1 [49] ; 50 cycles (0.4µs)
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set pins, 0 [105] ; 106 cycles (0.848µs)
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end_bit:
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jmp bit_loop ; Total per bit: 156 cycles (1.248µs)
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post_delay:
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set pins, 0 ; 70µs low period
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set y, 8749 ; (70µs / 8ns) - 1 = 8749 cycles
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delay_loop:
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jmp y--, delay_loop
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irq 0 ; Signal completion
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.wrap
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21523
compile_commands.json
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21523
compile_commands.json
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File diff suppressed because it is too large
Load Diff
7
main.cpp
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7
main.cpp
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#include "pico/stdio.h"
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#include "pico/stdlib.h"
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int main() {
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stdio_init_all();
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puts("Hello, world!");
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}
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121
pico_sdk_import.cmake
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121
pico_sdk_import.cmake
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# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
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# This can be dropped into an external project to help locate this SDK
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# It should be include()ed prior to project()
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# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
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#
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# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
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# following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
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set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
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message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
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set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
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message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
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set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
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message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
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set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
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message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
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endif ()
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if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
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set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
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message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
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endif()
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set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
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set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
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set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
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set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
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if (NOT PICO_SDK_PATH)
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if (PICO_SDK_FETCH_FROM_GIT)
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include(FetchContent)
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set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
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if (PICO_SDK_FETCH_FROM_GIT_PATH)
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get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
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endif ()
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FetchContent_Declare(
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pico_sdk
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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)
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if (NOT pico_sdk)
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message("Downloading Raspberry Pi Pico SDK")
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# GIT_SUBMODULES_RECURSE was added in 3.17
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if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
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FetchContent_Populate(
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pico_sdk
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QUIET
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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GIT_SUBMODULES_RECURSE FALSE
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SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
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BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
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SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
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)
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else ()
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FetchContent_Populate(
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pico_sdk
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QUIET
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
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BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
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SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
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)
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endif ()
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set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
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endif ()
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set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
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else ()
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message(FATAL_ERROR
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"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
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)
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endif ()
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endif ()
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get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
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if (NOT EXISTS ${PICO_SDK_PATH})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
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endif ()
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set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
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if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
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endif ()
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set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
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include(${PICO_SDK_INIT_CMAKE_FILE})
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57
tx_rx.cpp
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57
tx_rx.cpp
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// --- C/C++ Integration Code ---
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#include "hardware/irq.h"
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#include "hardware/pio.h"
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#include "pico/stdlib.h"
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#include "argb_tx.pio.h"
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#define PIN_BASE 0
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#define PIN_COUNT 1
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PIO pio = pio0;
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uint sm = 0;
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volatile bool transmission_done = false;
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void pio_irq_handler() {
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pio->irq = 1; // Clear interrupt
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transmission_done = true;
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}
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void init_pio() {
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uint offset = pio_add_program(pio, &argb_tx_program);
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pio_sm_config c = argb_tx_program_get_default_config(offset);
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sm_config_set_out_pins(&c, PIN_BASE, PIN_COUNT);
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sm_config_set_sideset_pins(&c, PIN_BASE);
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sm_config_set_out_shift(&c, true, true, 32);
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pio_sm_init(pio, sm, offset, &c);
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pio_set_irq0_source_enabled(pio, pis_interrupt0, true);
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irq_set_exclusive_handler(PIO0_IRQ_0, pio_irq_handler);
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irq_set_enabled(PIO0_IRQ_0, true);
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}
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void send_bits(const uint8_t *bits, uint num_bits) {
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transmission_done = false;
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// Send bit count (first word)
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uint32_t count_word = num_bits;
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pio_sm_put_blocking(pio, sm, count_word);
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// Pack bits into 32-bit words
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uint num_words = (num_bits + 31) / 32;
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for (uint i = 0; i < num_words; ++i) {
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uint32_t word = 0;
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for (uint b = 0; b < 32; ++b) {
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uint idx = i * 32 + b;
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if (idx < num_bits) {
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word |= (bits[idx] & 1) << b;
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}
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}
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pio_sm_put_blocking(pio, sm, word);
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}
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// Wait for completion
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while (!transmission_done)
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;
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}
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