From 9a5891e16d3ca6c6ea9a5c69d52421397f1b7ad7 Mon Sep 17 00:00:00 2001
From: Francois <thiebolt@irit.fr>
Date: Wed, 9 Mar 2022 21:08:51 +0100
Subject: [PATCH] update
---
neosensor/libraries/neocampus_drivers/SCD4x.h | 63 ++++++++++++++-----
1 file changed, 46 insertions(+), 17 deletions(-)
diff --git a/neosensor/libraries/neocampus_drivers/SCD4x.h b/neosensor/libraries/neocampus_drivers/SCD4x.h
index 6e30425c..b8fe40fa 100644
--- a/neosensor/libraries/neocampus_drivers/SCD4x.h
+++ b/neosensor/libraries/neocampus_drivers/SCD4x.h
@@ -5,8 +5,8 @@
@license
This is part of a the neOCampus drivers library.
- SCD4x is an ultrasonic CO2 sensor that features both temperature and hygro
- on an I2C interface
+ SCD4x is an ultrasonic CO2 sensor that also features
+ both temperature and hygro on an I2C interface :)
Remember: all transfers are 16bits wide
@@ -29,9 +29,6 @@
#include "generic_driver.h"
-#if 0
-TO BE CONTINUED
-
/*
* Definitions
@@ -39,26 +36,60 @@ TO BE CONTINUED
/* SCD4x sensor send back both CO2, T and RH at the same time, but since
* we'll have three instances of this class ==> we implement a cache to
* avoid reading the sensor multiple times */
-#define SHT3X_SENSOR_CACHE_MS 5000 // ms caches values validity
+#define SCD4X_SENSOR_CACHE_MS 5000 // ms caches values validity
// Enable CRC lookup table (regular computation otherwise)
-#ifndef SHT3X_CRC_LOOKUP_TABLE
-#define SHT3X_CRC_LOOKUP_TABLE 1
+#ifndef SCD4X_CRC_LOOKUP_TABLE
+#define SCD4X_CRC_LOOKUP_TABLE 1
#endif
-/* sht3x commands
+/* scd4x commands
* Note:
- * - we won't make use of the 'Periodic Mode' features (i.e continuous measurement)
- * - avoid stretch modes because measuremernt can take up to 16ms
- * - useless heater
- * - Repeatability is resolution
* - 1ms min. delay between two commands
- * - both temperature and humidity are measured and sent in a single 6bytes frame
- * 16bits T + CRC + 16bits RH + CRC
+ * - most commands need a 1ms execution time
+ * - CO2, temp and humidity are measured and sent in a single 9bytes frame
+ * 16bits C02 + CRC + 16bits T + CRC + 16bits RH + CRC
* - every 16bits frames are CRC protected
* - CRC8 0x31, initial=0xFF for 16bits data (first is )
*/
enum class sht3xCmd_t : uint16_t {
+
+ // basic commands
+ start_periodic_measurement = 0x21b1, // 5000ms measurement delay
+ read_measurement = 0xec05, // execution time: 1ms
+ stop_periodic_measurement = 0x3f86, // execution time: 500ms
+
+ // output signal compensation
+ set_temperature_offset = 0x241d, // execution time: 1ms
+ get_temperature_offset = 0x2318, // execution time: 1ms
+ set_sensor_altitude = 0x2427, // execution time: 1ms
+ get_sensor_altitude = 0x2322, // execution time: 1ms
+ set_ambiant_pressure = 0xe000, // execution time: 1ms
+
+ // field calibration
+ perform_forced_calibration = 0x362f // execution time: 400ms
+ set_automatic_self_calibration_enabled = 0x2416 // execution time: 1ms
+ get_automatic_self_calibration_enabled = 0x2313 // execution time: 1ms
+
+ // low-power operations
+ start_low_power_periodoc_measurement = 0x21ac, // 30s measurement delay
+ get_data_ready_status = 0xe4b8, // execution time: 1ms
+
+TO BE CONTINUED
+
+//Advanced features
+#define SCD4x_COMMAND_PERSIST_SETTINGS 0x3615 // execution time: 800ms
+#define SCD4x_COMMAND_GET_SERIAL_NUMBER 0x3682 // execution time: 1ms
+#define SCD4x_COMMAND_PERFORM_SELF_TEST 0x3639 // execution time: 10000ms
+#define SCD4x_COMMAND_PERFORM_FACTORY_RESET 0x3632 // execution time: 1200ms
+#define SCD4x_COMMAND_REINIT 0x3646 // execution time: 20ms
+
+//Low power single shot - SCD41 only
+#define SCD4x_COMMAND_MEASURE_SINGLE_SHOT 0x219d // execution time: 5000ms
+#define SCD4x_COMMAND_MEASURE_SINGLE_SHOT_RHT_ONLY 0x2196 // execution time: 50ms
+
+
+
soft_reset = 0X30A2, // software reset
heater_enable = 0x306D, // on-chip heater enable
heater_disable = 0x3066, // on-chip heater disable
@@ -158,6 +189,4 @@ class SHT3x : public generic_driver {
#endif /* SHT3X_CRC_LOOKUP_TABLE */
};
-#endif /* 0 */
-
#endif /* _SCD4X_H_ */
--
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