Added Plasma2040 example that displays data from the BME68x

drivers/bme68x/bme68x.cpp

@@ -33,7 +33,7 @@ namespace pimoroni {
     }
 
     bool BME68X::configure(uint8_t filter, uint8_t odr, uint8_t os_humidity, uint8_t os_pressure, uint8_t os_temp) {
-        int8_t result;
+        int8_t result = 0;
 
         conf.filter = filter;
         conf.odr = odr;

examples/plasma2040/CMakeLists.txt

@@ -1,3 +1,4 @@
+include(plasma2040_bme68x.cmake)
 include(plasma2040_rotary.cmake)
 include(plasma2040_rainbow.cmake)
 include(plasma2040_stacker.cmake)

examples/plasma2040/plasma2040_bme68x.cmake

@@ -0,0 +1,17 @@
+set(OUTPUT_NAME plasma2040_bme68x)
+add_executable(${OUTPUT_NAME} plasma2040_bme68x.cpp)
+
+target_link_libraries(${OUTPUT_NAME}
+        pico_stdlib
+        plasma2040
+        bme68x
+        hardware_i2c
+        pimoroni_i2c
+        rgbled
+        button
+        )
+
+# enable usb output
+pico_enable_stdio_usb(${OUTPUT_NAME} 1)
+
+pico_add_extra_outputs(${OUTPUT_NAME})

examples/plasma2040/plasma2040_bme68x.cpp

@@ -0,0 +1,165 @@
+#include <stdio.h>
+#include <math.h>
+#include <cstdint>
+
+#include "pico/stdlib.h"
+
+#include "plasma2040.hpp"
+
+#include "common/pimoroni_common.hpp"
+#include "bme68x.hpp"
+#include "rgbled.hpp"
+#include "button.hpp"
+
+using namespace pimoroni;
+using namespace plasma;
+
+// Set how many LEDs you have
+const uint N_LEDS = 30;
+
+// How many times the LEDs will be updated per second
+const uint UPDATES = 60;
+
+
+constexpr float TEMPERATURE_C_MIN = 20.0f;
+constexpr float TEMPERATURE_C_MAX = 35.0f;
+
+constexpr float PRESSURE_PA_MIN = 87000.0f;
+constexpr float PRESSURE_PA_MAX = 108500.0f;
+
+constexpr float HUMIDITY_MIN = 0.0f;
+constexpr float HUMIDITY_MAX = 100.0f;
+
+// Pick *one* LED type by uncommenting the relevant line below:
+
+// APA102-style LEDs with Data/Clock lines. AKA DotStar
+APA102 led_strip(N_LEDS, pio0, 0, plasma2040::DAT, plasma2040::CLK);
+
+// WS28X-style LEDs with a single signal line. AKA NeoPixel
+//WS2812 led_strip(N_LEDS, pio0, 0, plasma2040::DAT);
+
+
+
+Button button_a(plasma2040::BUTTON_A);
+Button button_b(plasma2040::BUTTON_B);
+
+RGBLED led(plasma2040::LED_R, plasma2040::LED_G, plasma2040::LED_B);
+
+I2C i2c(BOARD::PICO_EXPLORER);
+BME68X bme68x(&i2c);
+
+enum DisplayMode {
+  ALL,
+  TEMPERATURE,
+  PRESSURE,
+  HUMIDITY
+};
+
+
+float map(float x, float in_min, float in_max, float out_min, float out_max) {
+  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+void colour_gauge(float percent, uint start_led, uint end_led, float start_hue, float end_hue) {
+  if(end_led > start_led) {
+    uint range = end_led - start_led;
+    float light_pixels = percent * range;
+
+    for(uint i = 0; i < range; i++) {
+      float h = map(i, 0.0f, (float)range - 1, start_hue, end_hue);
+
+      uint i2 = i + 1;
+      if(i2 <= light_pixels) {
+        led_strip.set_hsv(i + start_led, h, 1.0f, 1.0f);
+      }
+      else if(i <= light_pixels) {
+        float scale = map(light_pixels, (float)i, (float)i2, 0.0f, 1.0f);
+        led_strip.set_hsv(i + start_led, h, 1.0f, scale);
+      }
+      else {
+        led_strip.set_hsv(i + start_led, 0.0f, 0.0f, 0.0f);
+      }
+    }
+  }
+}
+
+int main() {
+  stdio_init_all();
+
+  led_strip.start(UPDATES);
+
+  bool bme_detected = bme68x.init();
+
+
+  uint first_third = led_strip.num_leds / 3;
+  uint second_third = (led_strip.num_leds * 2) / 3;
+
+  float t = 0.0f;
+  DisplayMode mode = DisplayMode::ALL;
+  while(true) {
+    if(bme_detected) {
+      bme68x_data data;
+
+      auto result = bme68x.read_forced(&data);
+      (void)result;
+
+      printf("%.2f, %.2f, %.2f\n", data.temperature, data.pressure, data.humidity);
+
+      switch(mode) {
+        case DisplayMode::ALL:
+          t = map(data.temperature, TEMPERATURE_C_MIN, TEMPERATURE_C_MAX, 0.0f, 1.0f);
+          colour_gauge(t, 0, first_third, 0.667f, 1.0f);
+
+          t = map(data.pressure, PRESSURE_PA_MIN, PRESSURE_PA_MAX, 0.0f, 1.0f);
+          colour_gauge(t, first_third, second_third, 0.333f, 0.0f);
+
+          t = map(data.humidity, HUMIDITY_MIN, HUMIDITY_MAX, 0.0f, 1.0f);
+          colour_gauge(t, second_third, led_strip.num_leds, 0.333f, 0.667f);
+          break;
+
+        case DisplayMode::TEMPERATURE:
+          t = map(data.temperature, TEMPERATURE_C_MIN, TEMPERATURE_C_MAX, 0.0f, 1.0f);
+          colour_gauge(t, 0, led_strip.num_leds, 0.667f, 1.0f);
+          break;
+
+        case DisplayMode::PRESSURE:
+          t = map(data.pressure, PRESSURE_PA_MIN, PRESSURE_PA_MAX, 0.0f, 1.0f);
+          colour_gauge(t, 0, led_strip.num_leds, 0.333f, 0.0f);
+          break;
+
+        case DisplayMode::HUMIDITY:
+          t = map(data.humidity, HUMIDITY_MIN, HUMIDITY_MAX, 0.0f, 1.0f);
+          colour_gauge(t, 0, led_strip.num_leds, 0.333f, 0.667f);
+          break;
+      }
+    }
+    bool a_pressed = button_a.read();
+    bool b_pressed = button_b.read();
+
+    switch(mode) {
+      case DisplayMode::ALL:
+        led.set_rgb(127, 127, 127);
+        if(a_pressed) mode = DisplayMode::TEMPERATURE;
+        else if(b_pressed) mode = DisplayMode::HUMIDITY;
+        break;
+
+      case DisplayMode::TEMPERATURE:
+        led.set_rgb(255, 0, 255);
+        if(a_pressed) mode = DisplayMode::PRESSURE;
+        else if(b_pressed) mode = DisplayMode::ALL;
+        break;
+
+      case DisplayMode::PRESSURE:
+        led.set_rgb(255, 255, 0);
+        if(a_pressed) mode = DisplayMode::HUMIDITY;
+        else if(b_pressed) mode = DisplayMode::TEMPERATURE;
+        break;
+
+      case DisplayMode::HUMIDITY:
+        led.set_rgb(0, 255, 255);
+        if(a_pressed) mode = DisplayMode::ALL;
+        else if(b_pressed) mode = DisplayMode::PRESSURE;
+        break;
+    }
+  }
+}