From 762e9ce5c5d174c972d2171b5e96ebd1cad6507e Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Sat, 12 Feb 2022 16:40:17 +0000
Subject: some sort of partial updates

it's much faster, but the image is less "crisp"
---
 main.ino | 88 ++++++++++++++++++++++++++--------------------------------------
 1 file changed, 36 insertions(+), 52 deletions(-)

diff --git a/main.ino b/main.ino
index cb5d21a..bde8892 100644
--- a/main.ino
+++ b/main.ino
@@ -12,26 +12,40 @@
 #include <GxIO/GxIO_SPI/GxIO_SPI.h>
 #include <GxIO/GxIO.h>
 
-GxIO_Class io(SPI,  EPD_CS, EPD_DC,  EPD_RSET);
+GxIO_Class io(SPI, EPD_CS, EPD_DC, EPD_RSET);
 GxEPD_Class display(io, EPD_RSET, EPD_BUSY);
-SPIClass SDSPI(VSPI); // for sdcard? maybe?
-
+SPIClass SDSPI(VSPI); // for sdcard
 
 SensirionI2CScd4x scd4x;
 
-void printUint16Hex(uint16_t value) {
-    Serial.print(value < 4096 ? "0" : "");
-    Serial.print(value < 256 ? "0" : "");
-    Serial.print(value < 16 ? "0" : "");
-    Serial.print(value, HEX);
-}
-
-void printSerialNumber(uint16_t serial0, uint16_t serial1, uint16_t serial2) {
-    Serial.print("Serial: 0x");
-    printUint16Hex(serial0);
-    printUint16Hex(serial1);
-    printUint16Hex(serial2);
-    Serial.println();
+uint16_t co2 = 0;
+float temperature = 0.0f;
+float humidity = 0.0f;
+struct sps30_measurement m;
+
+void showThings(bool all=false) {
+  display.fillScreen(GxEPD_WHITE);
+  display.setCursor(0,20);
+
+  display.print("Co2:");
+  display.println(co2);
+  display.print("T:");
+  display.print(temperature);
+  display.print(" H:");
+  display.println(humidity);
+
+  display.print("PM 1:");
+  display.print(m.mc_1p0);
+  display.print(" PM 2.5:");
+  display.println(m.mc_2p5);
+
+  display.print("PM 4:");
+  display.print(m.mc_4p0);
+  display.print(" PM 10:");
+  display.println(m.mc_10p0);
+
+  // "partial" update
+  display.updateWindow(0, 0, GxEPD_WIDTH, GxEPD_HEIGHT, false);
 }
 
 void setup() {
@@ -50,8 +64,8 @@ void setup() {
     display.setTextColor(GxEPD_BLACK);
     display.setRotation(3);
     display.setFont(&FreeMonoBold9pt7b);
-    display.fillScreen(GxEPD_WHITE);
-    display.update();
+
+    showThings();
 
     uint16_t error;
     char errorMessage[256];
@@ -66,18 +80,13 @@ void setup() {
         Serial.println(errorMessage);
     }
 
-    uint16_t serial0;
-    uint16_t serial1;
-    uint16_t serial2;
-    error = scd4x.getSerialNumber(serial0, serial1, serial2);
+    error = scd4x.setAutomaticSelfCalibration(1);
     if (error) {
-        Serial.print("Error trying to execute getSerialNumber(): ");
+        Serial.print("Error trying to execute setAutomaticSelfCalibration(): ");
         errorToString(error, errorMessage, 256);
         Serial.println(errorMessage);
-    } else {
-        printSerialNumber(serial0, serial1, serial2);
     }
-
+    
     // Start Measurement
     error = scd4x.startPeriodicMeasurement();
     if (error) {
@@ -118,13 +127,8 @@ void loop() {
 
     delay(5000);
 
-    // Read Measurement
-    uint16_t co2 = 0;
-    float temperature = 0.0f;
-    float humidity = 0.0f;
     error = scd4x.readMeasurement(co2, temperature, humidity);
 
-    struct sps30_measurement m;
     char serial[SPS30_MAX_SERIAL_LEN];
     uint16_t data_ready;
     int16_t ret;
@@ -147,25 +151,5 @@ void loop() {
       return;
     }
 
-    display.fillScreen(GxEPD_WHITE);
-    display.setCursor(0,20);
-
-    display.print("Co2:");
-    display.println(co2);
-    display.print("T:");
-    display.print(temperature);
-    display.print(" H:");
-    display.println(humidity);
-
-    display.print("PM 1:");
-    display.print(m.mc_1p0);
-    display.print(" PM 2.5:");
-    display.println(m.mc_2p5);
-
-    display.print("PM 4:");
-    display.print(m.mc_4p0);
-    display.print(" PM 10:");
-    display.println(m.mc_10p0);
-
-    display.update();
+    showThings();
 }
-- 
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