Diff: pressure_sensors.cpp

Revision:

7:f4e248182d31

Child:

8:208d965a3bd2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pressure_sensors.cpp	Mon Apr 20 21:58:36 2020 +0000
@@ -0,0 +1,43 @@
+
+#include "mbed.h"
+#include "stdint.h"
+#include "project_defines.h"
+#include "pressure_sensors.h"
+
+
+/* Object definition */
+I2C pressure_sensor_01(PRESSURE_SENSOR_01_SDA_PIN, PRESSURE_SENSOR_01_SCL_PIN);
+I2C pressure_sensor_02(PRESSURE_SENSOR_02_SDA_PIN, PRESSURE_SENSOR_02_SCL_PIN);
+
+/* Global variable definition */
+uint16_t pressure_01_bin, pressure_02_bin, diff_pressure_bin;
+float pressure_01_psi, pressure_02_psi; 
+float diff_pressure_psi;
+
+char sensor_read_data_buffer[2];
+
+/* Function definition */
+
+void Pressure_Sensors_Initialize(void){
+    pressure_sensor_01.frequency(PRESSURE_SENSOR_I2C_CLK_HZ ); 
+    pressure_sensor_02.frequency(PRESSURE_SENSOR_I2C_CLK_HZ );
+}
+
+
+void Pressure_Sensors_Read(void){
+    
+    /* Read binary values */
+    pressure_sensor_01.read(PRESSURE_SENSOR_01_SRA, sensor_read_data_buffer, 2);
+    pressure_01_bin = ((sensor_read_data_buffer[0] << 8) | sensor_read_data_buffer[1]) & 0x3FFF;
+    pressure_sensor_02.read(PRESSURE_SENSOR_02_SRA, sensor_read_data_buffer, 2);
+    pressure_02_bin = ((sensor_read_data_buffer[0] << 8) | sensor_read_data_buffer[1]) & 0x3FFF;
+    diff_pressure_bin =  pressure_01_bin - pressure_02_bin;
+    
+    /* Calculate pressure values in PSI */
+    pressure_01_psi = (5.0 * pressure_01_bin) / 16383; 
+    pressure_02_psi = (5.0 * pressure_02_bin) / 16383;
+    diff_pressure_psi = (5.0 * diff_pressure_bin) / 16383;
+    
+} 
+
+