From 14e405f5152c99e3e2db9948a8cee780e1af04a3 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 15 May 2022 16:14:44 +0200
Subject: scd4x.read(): indicate whether read was successful

---
 src/app/datalogger/main.cc | 21 +++++++++++++--------
 src/driver/scd4x.cc        | 12 +++++++-----
 2 files changed, 20 insertions(+), 13 deletions(-)

(limited to 'src')

diff --git a/src/app/datalogger/main.cc b/src/app/datalogger/main.cc
index bf34b10..5800b1b 100644
--- a/src/app/datalogger/main.cc
+++ b/src/app/datalogger/main.cc
@@ -189,14 +189,17 @@ void loop(void)
 #endif
 
 #ifdef CONFIG_driver_scd4x
-	scd4x.read();
-	kout << dec << "CO₂: " << scd4x.co2 << " ppm" << endl;
-	kout << "Temperature: ";
-	kout.printf_float(((175.0 * scd4x.rawTemperature) / 65536) - 45);
-	kout << " °c" << endl;
-	kout << "Humidity: ";
-	kout.printf_float((100.0 * scd4x.rawHumidity) / 65536);
-	kout << " %" << endl;
+	if (scd4x.read()) {
+		kout << dec << "CO₂: " << scd4x.co2 << " ppm" << endl;
+		kout << "Temperature: ";
+		kout.printf_float(((175.0 * scd4x.rawTemperature) / 65536) - 45);
+		kout << " °c" << endl;
+		kout << "Humidity: ";
+		kout.printf_float((100.0 * scd4x.rawHumidity) / 65536);
+		kout << " %" << endl;
+	} else {
+		kout << "SCD4x error" << endl;
+	}
 #endif
 
 #ifdef CONFIG_driver_veml6075
@@ -301,7 +304,9 @@ int main(void)
 #endif
 
 #ifdef CONFIG_driver_mpu9250
+	kout << "MPU9250 init" << endl;
 	mpu9250.init();
+	kout << "MPU9250 nineAxis" << endl;
 	mpu9250.nineAxis();
 #endif
 
diff --git a/src/driver/scd4x.cc b/src/driver/scd4x.cc
index 3ad34a0..365cde8 100644
--- a/src/driver/scd4x.cc
+++ b/src/driver/scd4x.cc
@@ -32,16 +32,18 @@ void SCD4x::startLowPower()
 	i2c.xmit(address, 2, txbuf, 0, rxbuf);
 }
 
-void SCD4x::read()
+bool SCD4x::read()
 {
 	txbuf[0] = 0xec;
 	txbuf[1] = 0x05;
 
-	if (i2c.xmit(address, 2, txbuf, 9, rxbuf) == 0) {
-		co2 = (rxbuf[0] << 8) + rxbuf[1];
-		rawTemperature = ((rxbuf[3] << 8) + rxbuf[4]);
-		rawHumidity = (rxbuf[6] << 8) + rxbuf[7];
+	if (i2c.xmit(address, 2, txbuf, 9, rxbuf)) {
+		return false;
 	}
+	co2 = (rxbuf[0] << 8) + rxbuf[1];
+	rawTemperature = ((rxbuf[3] << 8) + rxbuf[4]);
+	rawHumidity = (rxbuf[6] << 8) + rxbuf[7];
+	return true;
 }
 
 SCD4x scd4x;
-- 
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