From 7f0db02066a7554b959fa264fcc200b2a2e4c929 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 1 Jan 2023 18:03:19 +0100
Subject: Add driver for ADS111x 16-Bit ADC

---
 src/app/datalogger/main.cc | 13 +++++++++++
 src/driver/Kconfig         |  4 ++++
 src/driver/ads111x.cc      | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 src/driver/ads111x.cc

(limited to 'src')

diff --git a/src/app/datalogger/main.cc b/src/app/datalogger/main.cc
index 251d1fa..1d41ee0 100644
--- a/src/app/datalogger/main.cc
+++ b/src/app/datalogger/main.cc
@@ -13,6 +13,9 @@
 #include "driver/soft_i2c.h"
 #endif
 
+#ifdef CONFIG_driver_ads111x
+#include "driver/ads111x.h"
+#endif
 #ifdef CONFIG_driver_lm75
 #include "driver/lm75.h"
 #endif
@@ -63,6 +66,12 @@
 
 void loop(void)
 {
+#ifdef CONFIG_driver_ads111x
+	kout << "Reading: ";
+	kout.printf_float(ads111x.readVoltage());
+	kout << " V" << endl;
+#endif
+
 #ifdef CONFIG_driver_lm75
 	kout << "temperature_celsius: ";
 	kout.printf_float(lm75.getTemp());
@@ -284,6 +293,10 @@ int main(void)
 	kout << "I2C setup OK" << endl;
 #endif
 
+#ifdef CONFIG_driver_ads111x
+	ads111x.configure(ADS111x::CONTINUOUS | ADS111x::FSR_4V | ADS111x::SPS_8 | ADS111x::SINGLE_3);
+#endif
+
 #ifdef CONFIG_driver_bme280
 	bme280.intf = BME280_I2C_INTF;
 	bme280.read = bme680_i2c_read;
diff --git a/src/driver/Kconfig b/src/driver/Kconfig
index 581ef10..163671f 100644
--- a/src/driver/Kconfig
+++ b/src/driver/Kconfig
@@ -25,6 +25,10 @@ bool
 
 menu "Drivers"
 
+config driver_ads111x
+bool "ADS111x 16-bit ADC"
+depends on meta_driver_i2c
+
 config driver_am2320
 bool "AM2320 TH Sensor"
 depends on meta_driver_i2c
diff --git a/src/driver/ads111x.cc b/src/driver/ads111x.cc
new file mode 100644
index 0000000..53be2a4
--- /dev/null
+++ b/src/driver/ads111x.cc
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Driver for ADS111x 16-Bit ADCs
+ */
+#include "driver/ads111x.h"
+#if defined(CONFIG_meta_driver_hardware_i2c)
+#include "driver/i2c.h"
+#elif defined(CONFIG_driver_softi2c)
+#include "driver/soft_i2c.h"
+#endif
+
+#include <stdint.h>
+
+void ADS111x::configure(unsigned short config)
+{
+	txbuf[0] = P_CONFIG;
+	txbuf[1] = config >> 8;
+	txbuf[2] = config & 0x00ff;
+	i2c.xmit(address, 3, txbuf, 0, rxbuf);
+
+	uint8_t pga_config = (config & CONF_PGA_MASK) >> CONF_PGA_OFFSET;
+	switch (pga_config) {
+		case 0:
+			fsr_scale = 24;
+			break;
+		case 1:
+			fsr_scale = 16;
+			break;
+		case 2:
+			fsr_scale = 8;
+			break;
+		case 3:
+			fsr_scale = 4;
+			break;
+		case 4:
+			fsr_scale = 2;
+			break;
+		default:
+			fsr_scale = 1;
+	}
+}
+
+float ADS111x::readVoltage()
+{
+	txbuf[0] = P_CONVERSION;
+	i2c.xmit(address, 1, txbuf, 2, rxbuf);
+
+	int16_t intermediate = ((int8_t)rxbuf[0]) * 256 + (uint8_t) rxbuf[1];
+
+	return intermediate * 0.256 / 0x7fff * fsr_scale;
+}
+
+ADS111x ads111x(0x48);
-- 
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