Update driver docs and test application to reflect non-fp usage

Adds driver docs related to the sensor data struct fields formatting, and updates the test application to make the sensor data more human-readable.

Author: nkanderson

libs/bme68x/Inc/bme68x_driver.h

@@ -69,6 +69,12 @@ typedef struct
 
   /** Structure to store sensor measurement data. */
   /** @todo: May modify this to be an array in order to support parallel mode */
+  /** @note: Since we're not using floating point, the data will be as follows:
+   *  - Temperature in degrees celsius x100
+   *  - Pressure in Pascal
+   *  - Humidity in % relative humidity x1000
+   *  - Gas resistance in Ohms
+   */
   struct bme68x_data sensor_data;
 
   // /** Array to store multiple sensor data values (for parallel mode). */

tests/test_bme688/test_bme688.c

@@ -133,7 +133,6 @@ int main(void)
   // bme_read(0xD0, &sensor_id, 4, &hi2c1);
   // debug_print("Received sensor ID: 0x%X\r\n", sensor_id);
 
-  debug_print("Temperature(deg C), Pressure(Pa), Humidity(%), Gas resistance(ohm), Status\r\n");
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -148,11 +147,17 @@ int main(void)
     int fetch_success = bme_fetch_data(&bme);
     if (fetch_success)
     {
-      debug_print("%d, ", bme.sensor_data.temperature);
-      debug_print("%d, ", bme.sensor_data.pressure);
-      debug_print("%d, ", bme.sensor_data.humidity);
-      debug_print("%d, ", bme.sensor_data.gas_resistance);
-      debug_print("%X, \r\n", bme.sensor_data.status);
+      debug_print("Temperature: %d.%02d°C, ",
+                  bme.sensor_data.temperature / 100,
+                  (bme.sensor_data.temperature % 100));
+      debug_print("Pressure: %d Pa, ", bme.sensor_data.pressure);
+      debug_print("Humidity: %d.%03d%%, ",
+                  bme.sensor_data.humidity / 1000,
+                  (bme.sensor_data.humidity % 1000));
+      debug_print("Gas Resistance: %d.%03d kΩ, ",
+                  bme.sensor_data.gas_resistance / 1000,
+                  (bme.sensor_data.gas_resistance % 1000));
+      debug_print("Status: 0x%X\r\n", bme.sensor_data.status);
     }
 
     // The "blink" code is a simple verification of program execution,