Create empty BME280 driver

include/mgos_barometer.h

@@ -26,7 +26,8 @@ extern "C" {
 enum mgos_barometer_type {
   BARO_NONE = 0,
   BARO_MPL115,
-  BARO_MPL3115
+  BARO_MPL3115,
+  BARO_BME280
 };
 
 struct mgos_barometer;

src/main.c

@@ -161,12 +161,11 @@ bool do_baro(struct mgos_barometer *sensor) {
   if (!sensor)
     return false;
 
-  if (mgos_barometer_get_pressure(sensor, &pressure)) {
+  if (mgos_barometer_get_pressure(sensor, &pressure))
     LOG(LL_INFO, ("Pressure %.2fPa", pressure));
-  }
-  if (mgos_barometer_get_temperature(sensor, &temperature)) {
+
+  if (mgos_barometer_get_temperature(sensor, &temperature)) 
     LOG(LL_INFO, ("Temperature %.2fC", temperature));
-  }
 
   return true;
 }
@@ -179,7 +178,7 @@ int main() {
   struct mgos_mcp9808 *mcp9808;
   struct mgos_ccs811 * ccs811;
   struct mgos_mpu9250 *mpu9250;
-  struct mgos_barometer *baro;
+  struct mgos_barometer *baro1, *baro2;
 
   if (!mgos_i2c_open(I2CBUSNR)) {
     LOG(LL_ERROR, ("Cannot open I2C bus %u", I2CBUSNR));
@@ -215,10 +214,16 @@ int main() {
     mgos_mpu9250_set_magnetometer_speed(mpu9250, MAG_100_HZ);
   }
   */
-  if (!(baro=mgos_barometer_create_i2c(i2c, 0x60, BARO_MPL3115))) {
+  if (!(baro1=mgos_barometer_create_i2c(i2c, 0x60, BARO_MPL3115))) {
     LOG(LL_ERROR, ("Cannot create barometer"));
   } else {
-    mgos_barometer_set_cache_ttl(baro, 1000);
+    mgos_barometer_set_cache_ttl(baro1, 1000);
+  }
+
+  if (!(baro2=mgos_barometer_create_i2c(i2c, 0x76, BARO_BME280))) {
+    LOG(LL_ERROR, ("Cannot create barometer"));
+  } else {
+    mgos_barometer_set_cache_ttl(baro2, 1000);
   }
 
   for (;;) {
@@ -230,7 +235,8 @@ int main() {
      * do_ccs811(ccs811);
      * do_mpu9250(mpu9250);
      */
-    do_baro(baro);
+    do_baro(baro1);
+    do_baro(baro2);
     sleep(1);
   }
 
@@ -240,7 +246,8 @@ int main() {
   mgos_mcp9808_destroy(&mcp9808);
   mgos_ccs811_destroy(&ccs811);
   mgos_mpu9250_destroy(&mpu9250);
-  mgos_barometer_destroy(&baro);
+  mgos_barometer_destroy(&baro1);
+  mgos_barometer_destroy(&baro2);
 
   return 0;
 }

src/mgos_barometer.c

@@ -18,6 +18,7 @@
 #include "mgos_barometer_internal.h"
 #include "mgos_barometer_mpl115.h"
 #include "mgos_barometer_mpl3115.h"
+#include "mgos_barometer_bme280.h"
 
 // Private functions follow
 // Private functions end
@@ -48,6 +49,12 @@ struct mgos_barometer *mgos_barometer_create_i2c(struct mgos_i2c *i2c, uint8_t i
       sensor->create = mgos_barometer_mpl3115_create;
       sensor->read = mgos_barometer_mpl3115_read;
       break;
+    case BARO_BME280:
+      sensor->detect = mgos_barometer_bme280_detect;
+      sensor->create = mgos_barometer_bme280_create;
+      sensor->read = mgos_barometer_bme280_read;
+      sensor->destroy = mgos_barometer_bme280_destroy;
+      break;
     default:
       LOG(LL_ERROR, ("Unknown mgos_barometer_type %d", type));
       free(sensor);

src/mgos_barometer_bme280.c

@@ -0,0 +1,37 @@
+#include "mgos_barometer_bme280.h"
+#include "mgos_i2c.h"
+
+// Datasheet:
+// https://cdn-shop.adafruit.com/datasheets/MPL115A2.pdf
+
+bool mgos_barometer_bme280_detect(struct mgos_barometer *dev) {
+  if (!dev) return false;
+  return false;
+}
+
+bool mgos_barometer_bme280_create(struct mgos_barometer *dev) {
+  struct mgos_barometer_bme280_data *bme280_data;
+
+  if (!dev) return false;
+  return false;
+}
+
+bool mgos_barometer_bme280_destroy(struct mgos_barometer *dev) {
+  if (!dev) return false;
+  if (dev->user_data) {
+    free(dev->user_data);
+    dev->user_data=NULL;
+  }
+  return true;
+}
+
+bool mgos_barometer_bme280_read(struct mgos_barometer *dev) {
+  struct mgos_barometer_bme280_data *bme280_data;
+
+  if (!dev) return false;
+  bme280_data=(struct mgos_barometer_bme280_data *) dev->user_data;
+  if (!bme280_data) return false;
+
+  return false;
+}
+

src/mgos_barometer_bme280.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "mgos.h"
+#include "mgos_barometer_internal.h"
+
+struct mgos_barometer_bme280_data {
+  float a0, b1, b2, c12;
+};
+
+bool mgos_barometer_bme280_detect(struct mgos_barometer *dev);
+bool mgos_barometer_bme280_create(struct mgos_barometer *dev);
+bool mgos_barometer_bme280_destroy(struct mgos_barometer *dev);
+bool mgos_barometer_bme280_read(struct mgos_barometer *dev);