Bruno Alfano
A library to use Honeywell pressure sensors from HSC series with SPI connection. For calibration scale and pressure range you have to set the declarations inside the hsc_spi.h file - Default values are for 10-90% calibration and 1.6bar absolute sensor
Diff: hsc_spi.cpp
- Revision:
- 0:0056857990b9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hsc_spi.cpp Sun Feb 16 18:30:04 2014 +0000
@@ -0,0 +1,41 @@
+#include <mbed.h>
+#include "hsc_spi.h"
+
+hsc_spi::hsc_spi(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) {}
+
+void hsc_spi::spi_init(){
+ spi.format(16,0);
+ }
+
+float hsc_spi::read_temp() {
+ unsigned int response;
+ float temperature;
+ select();
+ response=spi.write(0x0000);
+ response=spi.write(0x0000);
+ response=response/32;
+ temperature=response*200.0/2047.0 - 50.0;
+ deselect();
+ return temperature;
+}
+
+float hsc_spi::read_press() {
+ unsigned int response;
+ float pressure;
+ select();
+ response=spi.write(0x0000);
+ pressure=1.0*(response - OUTPUT_MIN)*(P_MAX - P_MIN)/(OUTPUT_MAX - OUTPUT_MIN) + P_MIN;
+ deselect();
+ return pressure;
+}
+
+void hsc_spi::select() {
+ spi_init();
+ //Set CS low to start transmission (interrupts conversion)
+ ncs = 0;
+}
+
+void hsc_spi::deselect() {
+ //Set CS high to stop transmission (restarts conversion)
+ ncs = 1;
+}
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