Initial commit

LICENSE

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+Copyright (c) 2021 Deomid "rojer" Ryabkov
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

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+# VEML7700 driver for Mongoose OS
+
+## Overview
+
+Provides a driver for the VEML7700 ambient light sensor.
+
+Includes automatic gain / interval adjustment algorithm.
+
+## Example
+
+```
+struct mgos_veml7700 *s_veml7700 = NULL;
+
+void veml7700_timer(void *arg) {
+  float lux = mgos_veml7700_read_lux(s_veml7700, true /* adjust */);
+  if (lux >= 0) {
+    LOG(LL_INFO, ("%.2f lux", lux));
+  }
+  (void) arg;
+}
+...
+  if (mgos_veml7700_detect(mgos_i2c_get_bus(0))) {
+    s_veml7700 = mgos_veml7700_create(mgos_i2c_get_bus(0));
+    bool res = mgos_veml7700_set_cfg(
+        s_veml7700,
+        MGOS_VEML7700_CFG_ALS_IT_100 | MGOS_VEML7700_CFG_ALS_GAIN_1,
+        MGOS_VEML7700_PSM_0);
+    LOG(LL_INFO, ("Detected VEML7700, config %d", res));
+    mgos_set_timer(100, MGOS_TIMER_REPEAT, veml7700_timer, NULL);
+  }
+
+```
+
+## Links
+
+ * [Datasheet](https://media.digikey.com/pdf/Data%20Sheets/Vishay%20Semiconductors/VEML7700.pdf)
+ * [Application note](https://www.vishay.com/docs/84323/designingveml7700.pdf)

include/mgos_veml7700.h

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+/*
+ * Copyright (c) 2021 Deomid "rojer" Ryabkov
+ * All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <mgos_i2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MGOS_VEML7700_CFG_SD (1 << 0)
+
+#define MGOS_VEML7700_CFG_ALS_PERS_1 (0 << 4)
+#define MGOS_VEML7700_CFG_ALS_PERS_2 (1 << 4)
+#define MGOS_VEML7700_CFG_ALS_PERS_4 (2 << 4)
+#define MGOS_VEML7700_CFG_ALS_PERS_8 (3 << 4)
+
+#define MGOS_VEML7700_CFG_ALS_IT_25 (0xc << 6)
+#define MGOS_VEML7700_CFG_ALS_IT_50 (8 << 6)
+#define MGOS_VEML7700_CFG_ALS_IT_100 (0 << 6)
+#define MGOS_VEML7700_CFG_ALS_IT_200 (1 << 6)
+#define MGOS_VEML7700_CFG_ALS_IT_400 (2 << 6)
+#define MGOS_VEML7700_CFG_ALS_IT_800 (3 << 6)
+
+#define MGOS_VEML7700_CFG_ALS_GAIN_1_8 (2 << 11)
+#define MGOS_VEML7700_CFG_ALS_GAIN_1_4 (3 << 11)
+#define MGOS_VEML7700_CFG_ALS_GAIN_1 (0 << 11)
+#define MGOS_VEML7700_CFG_ALS_GAIN_2 (1 << 11)
+
+#define MGOS_VEML7700_PSM_0 (0)
+#define MGOS_VEML7700_PSM_500 (1 | (0 << 1))
+#define MGOS_VEML7700_PSM_1000 (1 | (1 << 1))
+#define MGOS_VEML7700_PSM_2000 (1 | (2 << 1))
+#define MGOS_VEML7700_PSM_4000 (1 | (3 << 1))
+#define MGOS_VEML7700_PSM_NO_CHANGE (0xffff)
+
+bool mgos_veml7700_detect(struct mgos_i2c *bus);
+
+struct mgos_veml7700;
+
+struct mgos_veml7700 *mgos_veml7700_create(struct mgos_i2c *bus);
+
+bool mgos_veml7700_set_cfg(struct mgos_veml7700 *ctx, uint16_t cfg,
+                           uint16_t psm);
+
+int mgos_veml7700_get_meas_interval_ms(struct mgos_veml7700 *ctx);
+
+float mgos_veml7700_read_lux(struct mgos_veml7700 *ctx, bool adjust);
+
+#ifndef MGOS_VEML7700_ADJUST_UP_THRESH
+#define MGOS_VEML7700_ADJUST_UP_THRESH 2000
+#endif
+#ifndef MGOS_VEML7700_ADJUST_DOWN_THRESH
+#define MGOS_VEML7700_ADJUST_DOWN_THRESH 30000
+#endif
+
+bool mgos_veml7700_adjust(struct mgos_veml7700 *ctx);
+
+void mgos_veml7700_free(struct mgos_veml7700 *ctx);
+
+#ifdef __cplusplus
+}
+#endif

mos.yml

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+author: Deomid "rojer" Ryabkov <rojer@rojer.me>
+description: VEML7700 driver
+version: 1.0.0
+
+includes:
+  - include
+
+sources:
+  - src
+
+libs:
+  - origin: https://github.com/mongoose-os-libs/i2c
+
+tags:
+  - c
+  - docs:drivers:VEML7700
+
+manifest_version: 2017-09-29