LAB 2A: Akshaya Nidhi Bhati, Worked with: Yash Budhe and Sahil Mahendra Mangaonkar

Part 4 ESE 519/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+include(pico_sdk_import.cmake)
+project(modified C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+pico_sdk_init()
+add_executable(pio_ws2812)
+
+# generate the header file into the source tree as it is included in the RP2040 datasheet
+pico_generate_pio_header(pio_ws2812 ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio OUTPUT_DIR ${CMAKE_CURRENT_LIST_DIR}/generated)
+
+target_sources(pio_ws2812 PRIVATE ws2812.c)
+pico_enable_stdio_usb(pio_ws2812 1)
+pico_enable_stdio_uart(pio_ws2812 0)
+target_link_libraries(pio_ws2812 PRIVATE pico_stdlib hardware_pio)
+pico_add_extra_outputs(pio_ws2812)
+
+# add url via pico_set_program_url
+#example_auto_set_url(pio_ws2812)
+
+#add_executable(pio_ws2812_parallel)
+
+#pico_generate_pio_header(pio_ws2812_parallel ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio OUTPUT_DIR ${CMAKE_CURRENT_LIST_DIR}/generated)
+
+#
+
+
+#target_sources(pio_ws2812_parallel PRIVATE ws2812_parallel.c)
+
+#target_compile_definitions(pio_ws2812_parallel PRIVATE
+#        PIN_DBG1=3)
+
+#target_link_libraries(pio_ws2812_parallel PRIVATE pico_stdlib hardware_pio hardware_dma)
+#pico_add_extra_outputs(pio_ws2812_parallel)
+
+# add url via pico_set_program_url
+#example_auto_set_url(pio_ws2812_parallel)
+
+# Additionally generate python and hex pioasm outputs for inclusion in the RP2040 datasheet
+add_custom_target(pio_ws2812_datasheet DEPENDS ${CMAKE_CURRENT_LIST_DIR}/generated/ws2812.py)
+add_custom_command(OUTPUT ${CMAKE_CURRENT_LIST_DIR}/generated/ws2812.py
+        DEPENDS ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio
+        COMMAND Pioasm -o python ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio ${CMAKE_CURRENT_LIST_DIR}/generated/ws2812.py
+        )
+add_dependencies(pio_ws2812 pio_ws2812_datasheet)

Part 4 ESE 519/generated/ws2812.pio.h

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+// -------------------------------------------------- //
+// This file is autogenerated by pioasm; do not edit! //
+// -------------------------------------------------- //
+
+#pragma once
+
+#if !PICO_NO_HARDWARE
+#include "hardware/pio.h"
+#endif
+
+// ------ //
+// ws2812 //
+// ------ //
+
+#define ws2812_wrap_target 0
+#define ws2812_wrap 3
+
+#define ws2812_T1 2
+#define ws2812_T2 5
+#define ws2812_T3 3
+
+static const uint16_t ws2812_program_instructions[] = {
+            //     .wrap_target
+    0x6221, //  0: out    x, 1            side 0 [2] 
+    0x1123, //  1: jmp    !x, 3           side 1 [1] 
+    0x1400, //  2: jmp    0               side 1 [4] 
+    0xa442, //  3: nop                    side 0 [4] 
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program ws2812_program = {
+    .instructions = ws2812_program_instructions,
+    .length = 4,
+    .origin = -1,
+};
+
+static inline pio_sm_config ws2812_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + ws2812_wrap_target, offset + ws2812_wrap);
+    sm_config_set_sideset(&c, 1, false, false);
+    return c;
+}
+
+#include "hardware/clocks.h"
+static inline void ws2812_program_init(PIO pio, uint sm, uint offset, uint pin, float freq, bool rgbw) {
+    pio_gpio_init(pio, pin);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
+    pio_sm_config c = ws2812_program_get_default_config(offset);
+    sm_config_set_sideset_pins(&c, pin);
+    sm_config_set_out_shift(&c, false, true, rgbw ? 32 : 24);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+    int cycles_per_bit = ws2812_T1 + ws2812_T2 + ws2812_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+
+#endif
+
+// --------------- //
+// ws2812_parallel //
+// --------------- //
+
+#define ws2812_parallel_wrap_target 0
+#define ws2812_parallel_wrap 3
+
+#define ws2812_parallel_T1 2
+#define ws2812_parallel_T2 5
+#define ws2812_parallel_T3 3
+
+static const uint16_t ws2812_parallel_program_instructions[] = {
+            //     .wrap_target
+    0x6020, //  0: out    x, 32                      
+    0xa10b, //  1: mov    pins, !null            [1] 
+    0xa401, //  2: mov    pins, x                [4] 
+    0xa103, //  3: mov    pins, null             [1] 
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program ws2812_parallel_program = {
+    .instructions = ws2812_parallel_program_instructions,
+    .length = 4,
+    .origin = -1,
+};
+
+static inline pio_sm_config ws2812_parallel_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + ws2812_parallel_wrap_target, offset + ws2812_parallel_wrap);
+    return c;
+}
+
+#include "hardware/clocks.h"
+static inline void ws2812_parallel_program_init(PIO pio, uint sm, uint offset, uint pin_base, uint pin_count, float freq) {
+    for(uint i=pin_base; i<pin_base+pin_count; i++) {
+        pio_gpio_init(pio, i);
+    }
+    pio_sm_set_consecutive_pindirs(pio, sm, pin_base, pin_count, true);
+    pio_sm_config c = ws2812_parallel_program_get_default_config(offset);
+    sm_config_set_out_shift(&c, true, true, 32);
+    sm_config_set_out_pins(&c, pin_base, pin_count);
+    sm_config_set_set_pins(&c, pin_base, pin_count);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+    int cycles_per_bit = ws2812_parallel_T1 + ws2812_parallel_T2 + ws2812_parallel_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+
+#endif
+

Part 4 ESE 519/generated/ws2812.py

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+# -------------------------------------------------- #
+# This file is autogenerated by pioasm; do not edit! #
+# -------------------------------------------------- #
+
+import rp2
+from machine import Pin
+# ------ #
+# ws2812 #
+# ------ #
+
+ws2812_T1 = 2
+ws2812_T2 = 5
+ws2812_T3 = 3
+
+@rp2.asm_pio(sideset_init=pico.PIO.OUT_HIGH, out_init=pico.PIO.OUT_HIGH, out_shiftdir=1)
+def ws2812():
+    wrap_target()
+    label("0")
+    out(x, 1)               .side(0) [2]  # 0
+    jmp(not_x, "3")         .side(1) [1]  # 1
+    jmp("0")                .side(1) [4]  # 2
+    label("3")
+    nop()                   .side(0) [4]  # 3
+    wrap()
+
+
+
+# --------------- #
+# ws2812_parallel #
+# --------------- #
+
+ws2812_parallel_T1 = 2
+ws2812_parallel_T2 = 5
+ws2812_parallel_T3 = 3
+
+@rp2.asm_pio()
+def ws2812_parallel():
+    wrap_target()
+    out(x, 32)                            # 0
+    mov(pins, invert(null))          [1]  # 1
+    mov(pins, x)                     [4]  # 2
+    mov(pins, null)                  [1]  # 3
+    wrap()
+
+
+

Part 4 ESE 519/pico_sdk_import.cmake

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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()
+
+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})

Part 4 ESE 519/ws2812.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+//Header files
+#include <stdio.h>
+#include <stdlib.h>
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"
+#include "ws2812.pio.h"
+
+//defining NUM_PIXELS to 150
+#define IS_RGBW true
+#define NUM_PIXELS 150
+
+#ifdef PICO_DEFAULT_WS2812_PIN
+#define WS2812_PIN PICO_DEFAULT_WS2812_PIN
+#else
+// default to pin 2 if the board doesn't have a default WS2812 pin defined
+#define WS2812_PIN 12
+#endif
+
+
+void set_neopixel_color(uint32_t color) { 
+
+    pio_sm_put_blocking(pio0, 0, color << 8u);
+} 
+char c;
+int main() {
+    //set_sys_clock_48();
+    stdio_init_all();
+    printf("WS2812 Smoke Test, using pin %d", WS2812_PIN);
+
+    // todo get free sm
+    PIO pio = pio0;
+    int sm = 0;
+    uint offset = pio_add_program(pio, &ws2812_program);
+
+    ws2812_program_init(pio, sm, offset, WS2812_PIN, 800000, IS_RGBW);
+    void set_color(uint32_t color){
+        printf("Blink \n");
+        set_neopixel_color(color);
+        sleep_ms(2000);
+        set_neopixel_color(0x000000);
+    }
+    int t = 0;
+    while (1) {
+        printf("Enter any character\n");
+        scanf("%c", &c);  
+        printf("Character = %c\n",c);
+        sleep_ms(100);
+        const uint LED_PIN = 11;
+        gpio_init(LED_PIN);
+        gpio_set_dir(LED_PIN, GPIO_OUT);
+        gpio_put(LED_PIN, 1);
+        uint32_t color;
+        switch(c) {
+            case 'r':
+                set_color(0x00FF00);
+                printf("Red");
+                break;
+            case 'g':
+                set_color(0xFF0000);
+                printf("Green");
+                break;
+            case 'b':
+                set_color(0x0000FF);
+                printf("Blue");
+                break;
+            default:
+                printf("Error\n");
+
+        }
+    }
+}
+
+
+// If 'r' then red color, 'g' then green, and 'b' then blue