init converting project from micro python to c

.gitignore

@@ -1,3 +1,5 @@
-CIRCUITPY/settings.toml
+settings.toml
 .DS_Store
 .vscode/
+build/
+.cache/

CIRCUITPY/.vscode/settings.json

@@ -1,15 +0,0 @@
-{
-    "python.languageServer": "None",
-    "python.linting.pylintEnabled": false,
-    "python.analysis.diagnosticSeverityOverrides": {
-        "reportMissingModuleSource": "none"
-    },
-    "python.analysis.extraPaths": [
-        "/Users/travis.shears/.vscode/extensions/joedevivo.vscode-circuitpython-0.1.20-darwin-arm64/boards/0x239A/0x80F4",
-        "/Users/travis.shears/.vscode/extensions/joedevivo.vscode-circuitpython-0.1.20-darwin-arm64/stubs",
-        "/Users/travis.shears/Library/Application Support/Code/User/globalStorage/joedevivo.vscode-circuitpython/bundle/20230815/adafruit-circuitpython-bundle-py-20230815/lib"
-    ],
-    "circuitpython.board.version": "8.2.0",
-    "circuitpython.board.vid": "0x239A",
-    "circuitpython.board.pid": "0x80F4"
-}

CmakeLists.txt

@@ -0,0 +1,30 @@
+# What CMake to start at
+cmake_minimum_required( VERSION 3.31 )
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+#set(PICO_BOARD pico CACHE STRING "Board type")
+
+# Pull in SDK (must be before project)
+include( pico_sdk_import.cmake )
+
+# Set the name and version of the project
+
+project(test C CXX ASM)
+# project(test VERSION 1.0.0 )
+
+# Initialize the SDK
+pico_sdk_init()
+
+
+# the executable
+add_executable( node1 node1.c )
+pico_set_program_version(node1 "0.1")
+pico_set_program_name(node1 "node_one")
+
+# pull in common dependencies
+target_link_libraries( node1 pico_stdlib )
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs( node1 )

README.md

@@ -2,13 +2,23 @@
 
 A DIY weather station on my balcony that is hooked up to [Home Assistant](https://www.home-assistant.io/).
 
-The code is [CircuitPython](https://circuitpython.org/). It follows many of the patterns I learned in creating an [aquarium controller](https://git.sr.ht/~travisshears/sewa-reef-controller).
+The source code started as [CircuitPython](https://circuitpython.org/) following
+many of the patterns I learned in creating an [aquarium controller](https://git.sr.ht/~travisshears/sewa-reef-controller).
+I have since switch to using C.
 
-## Capabilities 
+## Capabilities
 
 Right now the station is fairly limited measuring only temperature, humidity,
-and atmospheric pressure. I have plans to expand the project to also measure
-noise levels, and wind.
+and atmospheric pressure. I have plans to expand the project to in the end measure:
+
+- tempature
+- humidity
+- atmospheric pressure
+- noise levels
+- wind speed
+- wind direction
+- rain fall
+- light
 
 ## Hardware
 
@@ -17,12 +27,12 @@ Sensors:
 
 MCs:
 - [Raspberry Pi Pico](https://www.raspberrypi.com/products/raspberry-pi-pico/)
-- [Adafruit Airlift](https://www.adafruit.com/product/4201)
 
 Other:
 - [Weatherproof Enclosure](https://shop.pimoroni.com/products/weatherproof-cover-for-outdoor-sensors?variant=40047884468307)
 
 _Note: I would not recommend buying from pimoroni from EU as shipping tax is huge!_
+
 ## Images
 
 Circuit board:

node1.c

@@ -0,0 +1,240 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"
+#include "blink_led.pio.h"
+
+// == TM1637Display ==
+// #define TM1637_CMD_DATA_AUTO  0x40
+#define TM1637_DELAY_US 20 // Delay time in microseconds
+#define TM1637_CMD_DATA_FIXED 0x44
+#define TM1637_CMD_ADDR_START 0xC0
+#define TM1637_CMD_DISPLAY    0x88
+#define TM1637_BRIGHTNESS  5 // min 0 max 7
+
+typedef struct {
+  uint clock_pin;
+  uint data_pin;
+} TM1637Display;
+
+TM1637Display tm1637_init(uint clock_pin, uint data_pin);
+void tm1637_write_command(const TM1637Display *d, uint8_t command);
+void tm1637_display_number(const TM1637Display *d, uint num);
+void tm1637_start(const TM1637Display *display);
+void tm1637_stop(const TM1637Display *display);
+void tm1637_write_bit(const TM1637Display *display, bool bit);
+bool tm1637_write_byte(const TM1637Display *display, uint8_t byte);
+void tm1637_write_command(const TM1637Display *display, uint8_t command);
+
+
+const uint8_t tm1637_num_patterns[10] = {
+    0x3F, // 0
+    0x06, // 1
+    0x5B, // 2
+    0x4F, // 3
+    0x66, // 4
+    0x6D, // 5
+    0x7D, // 6
+    0x07, // 7
+    0x7F, // 8
+    0x6F  // 9
+};
+
+TM1637Display tm1637_init(uint clock_pin, uint data_pin) {
+    TM1637Display display;
+    display.clock_pin = clock_pin;
+    display.data_pin = data_pin;
+
+
+    gpio_init(display.clock_pin);
+    gpio_init(display.data_pin);
+
+    gpio_set_dir(display.clock_pin, GPIO_OUT);
+    gpio_set_dir(display.data_pin, GPIO_OUT);
+    tm1637_write_command(&display, TM1637_CMD_DISPLAY | TM1637_BRIGHTNESS);
+    return display;
+}
+
+void tm1637_start(const TM1637Display *display) {
+    gpio_set_dir(display->data_pin, GPIO_OUT);
+    gpio_put(display->data_pin, 1);
+    gpio_put(display->clock_pin, 1);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->data_pin, 0);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 0);
+}
+
+void tm1637_stop(const TM1637Display *display) {
+    gpio_set_dir(display->data_pin, GPIO_OUT);
+    gpio_put(display->clock_pin, 0);
+    gpio_put(display->data_pin, 0);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 1);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->data_pin, 1);
+    sleep_us(TM1637_DELAY_US);
+}
+
+void tm1637_write_bit(const TM1637Display *display, bool bit) {
+    gpio_put(display->clock_pin, 0);
+    if (bit)
+    {
+        gpio_set_dir(display->data_pin, GPIO_IN);
+    }
+    else
+    {
+        gpio_set_dir(display->data_pin, GPIO_OUT);
+        gpio_put(display->data_pin, 0);
+    }
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 1);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 0);
+    gpio_set_dir(display->data_pin, GPIO_OUT);
+}
+
+bool tm1637_write_byte(const TM1637Display *display, uint8_t byte) {
+    for (int i = 0; i < 8; i++)
+    {
+        tm1637_write_bit(display, byte & 0x01);
+        byte >>= 1;
+    }
+    // Wait for ACK
+    gpio_set_dir(display->data_pin, GPIO_IN);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 0);
+    sleep_us(TM1637_DELAY_US);
+    gpio_put(display->clock_pin, 1);
+    sleep_us(TM1637_DELAY_US);
+    bool ack = !gpio_get(display->data_pin);
+    gpio_put(display->clock_pin, 0);
+    gpio_set_dir(display->data_pin, GPIO_OUT);
+    return ack;
+}
+
+void tm1637_write_command(const TM1637Display *display, uint8_t command) {
+    tm1637_start(display);
+    tm1637_write_byte(display, command);
+    tm1637_stop(display);
+}
+
+void tm1637_display_number(const TM1637Display *display, uint num) {
+    if (num > 9999) return;
+
+    uint8_t digits[4] = {0};
+
+    // Extract digits and store them in the array from most significant digit to least significant digit
+    for (int i = 0; i < 4; i++)
+    {
+        digits[3 - i] = num % 10;
+        num /= 10;
+    }
+
+    tm1637_start(display);
+    bool ack = tm1637_write_byte(display, TM1637_CMD_DATA_FIXED);
+    tm1637_stop(display);
+    if(!ack) return tm1637_display_number(display, num);
+
+    for (int i = 0; i < 4; i++)
+    {
+        tm1637_start(display);
+        bool ack1 = tm1637_write_byte(display, TM1637_CMD_ADDR_START + i);
+        bool ack2 = tm1637_write_byte(display, tm1637_num_patterns[digits[i]]);
+        tm1637_stop(display);
+        if(!ack1 || !ack2) return tm1637_display_number(display, num);
+    }
+}
+
+// == LEDS ==
+void init_leds() {
+    gpio_init(PICO_DEFAULT_LED_PIN);
+    gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
+}
+void set_led(bool state) {
+    gpio_put(PICO_DEFAULT_LED_PIN, state);
+}
+// == RGB_LED ==
+
+// #define RGB_LED_PIN PICO_DEFAULT_LED_PIN
+#define RGB_PIO_FREQ 2000
+// PIO blink example: https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-cc-part-3-how-to-use-pio/123ff7700bc547c79a504858c1bd8110
+// static const uint led_pin = 25;
+// static const float pio_freq = 2000;
+void init_rgb_leds() {
+    //Choose PIO instance (0 or 1)
+    PIO pio = pio0;
+    // Get first free state machine in PIO 0
+    uint sm = pio_claim_unused_sm(pio, true);
+
+    // Add PIO program to PIO instruction memory. SDK will find location and
+    // return with the memory offset of the program.
+    uint offset = pio_add_program(pio, &blink_program);
+
+    // Calculate the PIO clock divider
+    float div = (float)clock_get_hz(clk_sys) / RGB_PIO_FREQ;
+
+    // Initialize the program using the helper function in our .pio file
+    blink_program_init(pio, sm, offset, PICO_DEFAULT_LED_PIN, div);
+
+    // Start running our PIO program in the state machine
+    pio_sm_set_enabled(pio, sm, true);
+
+}
+
+// == Buttons ==
+#define ARM_BTN_GPIO 15
+void init_btn(uint pin) {
+    gpio_init(pin);
+    gpio_set_dir(pin, GPIO_IN);
+    gpio_pull_up(pin);
+}
+
+alarm_id_t armed_timer_id;
+int64_t armed_cb() {
+    printf("ROCKET ARMED\n");
+    return 0;
+}
+
+bool arm_btn_pressed = false;
+void check_btns() {
+    if(!gpio_get(ARM_BTN_GPIO) && !arm_btn_pressed)  {
+        printf("BTN PRESSED\n");
+        armed_timer_id = add_alarm_in_ms(5000, armed_cb, NULL, false);
+        arm_btn_pressed = true;
+        set_led(true);
+    }
+
+    if(gpio_get(ARM_BTN_GPIO) && arm_btn_pressed)  {
+        printf("BTN LET GO\n");
+        cancel_alarm(armed_timer_id);
+        arm_btn_pressed = false;
+        set_led(false);
+    }
+}
+
+int main() {
+    stdio_init_all();
+    // const TM1637Display digit_display_001 = tm1637_init(12, 13);
+    // const TM1637Display digit_display_002 = tm1637_init(14, 15);
+
+    // init_btn(ARM_BTN_GPIO);
+    // init_leds();
+    init_rgb_leds();
+
+    // static absolute_time_t delayed_by_ms (const absolute_time_t t, uint32_t ms)
+
+    // volatile bool timer_fired = false;
+
+    while (true) {
+        check_btns();
+        sleep_us(50);
+
+        // for (int i = 0; i <= 9999; i ++) {
+        //     printf("Display: %d \n", i);
+        //     // tm1637_display_number(&digit_display_001, i);
+        //     tm1637_display_number(&digit_display_002, i);
+        //     sleep_ms(100);
+        // }
+    }
+}

pico_sdk_import.cmake

@@ -0,0 +1,84 @@
+# 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 ()
+
+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 "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+            )
+        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})