Jason Beatch
/
LPS331AP_SPI
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Revision 2:77cb7992a1a3, committed 2014-07-24
- Comitter:
- jbeatch
- Date:
- Thu Jul 24 14:53:59 2014 +0000
- Parent:
- 1:a1e0d54a6be3
- Commit message:
- added functions to output Temp [C], Temp [F], and Pressure [mbar]
Changed in this revision
diff -r a1e0d54a6be3 -r 77cb7992a1a3 LPS331.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/LPS331.cpp Thu Jul 24 14:53:59 2014 +0000
@@ -0,0 +1,135 @@
+
+#include <mbed.h>
+#include "LPS331.h"
+
+#define STATUS_REG 0x27
+#define MULTI_BYTE 0x40
+#define REF_P_XL 0x08
+#define REF_P_L 0x09
+#define REF_P_H 0x0A
+#define WHO_AM_I 0x0F
+#define RES_CONF 0x10
+#define CTRL_REG1 0x20
+#define PRESS_POUT_XL_REH 0x28
+#define PRESS_OUT_L 0x29
+#define PRESS_OUT_H 0x2A
+#define TEMP_OUT_L 0x2B
+#define TEMP_OUT_H 0x2C
+
+#define WRITE 0x00
+#define READ 0x80
+
+#define pSensor 0x02
+#define tSensor 0x01
+#define bothSensors 0x03
+
+lps331::lps331(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) {
+}
+
+uint16_t lps331::read_temperature() {
+ // check if updated value is available
+ if ( ready(tSensor) )
+ {
+ select();
+ // do multi byte read
+ spi.write(READ | MULTI_BYTE | TEMP_OUT_L);
+ uint8_t tempL = spi.write(READ);
+ uint8_t tempH = spi.write(READ);
+ deselect();
+
+ uint16_t temperature = (tempH<<8) | tempL;
+ // t[C] = 42.5 + temperature /480.0
+ //float temp = (float)(42.5 + ((short)temperature*1.0/480.0));
+ return temperature;
+ }
+ return 0;
+}
+
+uint32_t lps331::read_pressure() {
+ // check if updated value is available
+ if ( ready(pSensor) )
+ {
+ select();
+ // do multi byte read
+ spi.write(READ | MULTI_BYTE | PRESS_POUT_XL_REH);
+ uint8_t pressureLX = spi.write(READ);
+ uint8_t pressureL = spi.write(READ);
+ uint8_t pressureH = spi.write(READ);
+ deselect();
+
+ uint32_t pressure = (pressureH<<16) | (pressureL<<8) | pressureLX;
+ // P[mBar] = pressure/4096
+ // float P = pressure*1.0/4096.0;
+ return pressure;
+ }
+ return 0;
+}
+
+float lps331::get_Pressure_mbar()
+{
+ uint32_t airP = read_pressure();
+ float pressure = airP*1.0/4096.0;
+ return pressure;
+}
+
+float lps331::get_Temp_C()
+{
+ short airT = read_temperature();
+ float temp = (float)(42.5 + (airT*1.0/480.0));
+ return temp;
+}
+
+float lps331::get_Temp_F()
+{
+ short airT = read_temperature();
+ float temp = (float)(108.5 + (airT*1.8/480.0));
+ return temp;
+}
+
+void lps331::select() {
+ //Set CS low to start transmission (interrupts conversion)
+ ncs = 0;
+}
+
+void lps331::deselect() {
+ //Set CS high to stop transmission (restarts conversion)
+ ncs = 1;
+}
+
+bool lps331::initialize(int setType) {
+ deselect();
+ spi.format(8,0);
+ spi.frequency(400000);
+
+ // set chip to update pressure and temp at 25Hz
+ writeRegister(CTRL_REG1, 0xE0);
+ wait_ms(1);
+
+ // check board is responding
+ int whoami = readRegister(WHO_AM_I);
+ if (whoami == 0xBB) // addresss of chip
+ return true;
+ return false;
+}
+
+int lps331::ready(uint8_t sensor) {
+ uint8_t status = readRegister(STATUS_REG);
+ if( (status & sensor))
+ return 1;
+ return 0;
+}
+
+uint8_t lps331::readRegister(uint8_t address){
+ select();
+ spi.write(READ | address);
+ uint8_t val = spi.write(READ);
+ deselect();
+ return val;
+ }
+
+void lps331::writeRegister(uint8_t address, uint8_t value){
+ select();
+ spi.write(WRITE | address);
+ spi.write(value);
+ deselect();
+}
\ No newline at end of file
diff -r a1e0d54a6be3 -r 77cb7992a1a3 LPS331.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/LPS331.h Thu Jul 24 14:53:59 2014 +0000
@@ -0,0 +1,34 @@
+#ifndef LPS331AP_h
+#define LPS331AP_h
+
+#include "mbed.h"
+
+class lps331
+{
+ SPI& spi;
+ DigitalOut ncs;
+ public:
+
+ lps331(SPI& _spi, PinName _ncs);
+ void select();
+ void deselect();
+ bool initialize(int setType=0);
+
+ int ready(uint8_t sensor);
+ //float read_pressure();
+ uint32_t read_pressure();
+ uint16_t read_temperature();
+ float get_Pressure_mbar();
+ float get_Temp_C();
+ float get_Temp_F();
+ private:
+ PinName _CS_pin;
+ PinName _SO_pin;
+ PinName _SCK_pin;
+ uint8_t readRegister(uint8_t address);
+ void writeRegister(uint8_t address, uint8_t value);
+ int _units;
+ float _error;
+};
+
+#endif
diff -r a1e0d54a6be3 -r 77cb7992a1a3 lps331.cpp
--- a/lps331.cpp Wed Jul 23 22:30:35 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,114 +0,0 @@
-
-#include <mbed.h>
-#include "lps331.h"
-
-#define STATUS_REG 0x27
-#define MULTI_BYTE 0x40
-#define REF_P_XL 0x08
-#define REF_P_L 0x09
-#define REF_P_H 0x0A
-#define WHO_AM_I 0x0F
-#define RES_CONF 0x10
-#define CTRL_REG1 0x20
-#define PRESS_POUT_XL_REH 0x28
-#define PRESS_OUT_L 0x29
-#define PRESS_OUT_H 0x2A
-#define TEMP_OUT_L 0x2B
-#define TEMP_OUT_H 0x2C
-
-#define WRITE 0x00
-#define READ 0x80
-
-#define pSensor 0x02
-#define tSensor 0x01
-#define bothSensors 0x03
-
-lps331::lps331(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) {
-}
-
-uint16_t lps331::read_temperature() {
- // check if updated value is available
- if ( ready(tSensor) )
- {
- //select();
- // do multi byte read
- //spi.write(READ | MULTI_BYTE | TEMP_OUT_L);
- uint8_t tempL = readRegister(TEMP_OUT_L);
- uint8_t tempH = readRegister(TEMP_OUT_H);
- //deselect();
-
- uint16_t temperature = (tempH<<8) | tempL;
- // t[C] = 42.5 + temperature /480.0
- //float temp = (float)(42.5 + ((short)temperature*1.0/480.0));
- return temperature;
- }
- return 0;
-}
-
-uint32_t lps331::read_pressure() {
- // check if updated value is available
- if ( ready(pSensor) )
- {
- select();
- // do multi byte read
- spi.write(READ | MULTI_BYTE | PRESS_POUT_XL_REH);
- uint8_t pressureLX = spi.write(READ);
- uint8_t pressureL = spi.write(READ);
- uint8_t pressureH = spi.write(READ);
- deselect();
-
- uint32_t pressure = (pressureH<<16) | (pressureL<<8) | pressureLX;
- // P[mBar] = pressure/4096
- // float P = pressure*1.0/4096.0;
- return pressure;
- }
- return 0;
-}
-
-void lps331::select() {
- //Set CS low to start transmission (interrupts conversion)
- ncs = 0;
-}
-
-void lps331::deselect() {
- //Set CS high to stop transmission (restarts conversion)
- ncs = 1;
-}
-
-bool lps331::initialize(int setType) {
- deselect();
- spi.format(8,0);
- spi.frequency(400000);
-
- // set chip to update pressure and temp at 25Hz
- writeRegister(CTRL_REG1, 0xE0);
- wait_ms(1);
-
- // check board is responding
- int whoami = readRegister(WHO_AM_I);
- if (whoami == 0xBB) // addresss of chip
- return true;
- return false;
-}
-
-int lps331::ready(uint8_t sensor) {
- uint8_t status = readRegister(STATUS_REG);
- if( (status & sensor))
- return 1;
- return 0;
-}
-
-uint8_t lps331::readRegister(uint8_t address){
- select();
- spi.write(READ | address);
- uint8_t val = spi.write(READ);
- deselect();
- return val;
- }
-
-void lps331::writeRegister(uint8_t address, uint8_t value){
- select();
- spi.write(WRITE | address);
- spi.write(value);
- deselect();
-}
\ No newline at end of file
diff -r a1e0d54a6be3 -r 77cb7992a1a3 lps331.h
--- a/lps331.h Wed Jul 23 22:30:35 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,31 +0,0 @@
-#ifndef LPS331AP_h
-#define LPS331AP_h
-
-#include "mbed.h"
-
-class lps331
-{
- SPI& spi;
- DigitalOut ncs;
- public:
-
- lps331(SPI& _spi, PinName _ncs);
- void select();
- void deselect();
- bool initialize(int setType=0);
-
- int ready(uint8_t sensor);
- //float read_pressure();
- uint32_t read_pressure();
- uint16_t read_temperature();
- private:
- PinName _CS_pin;
- PinName _SO_pin;
- PinName _SCK_pin;
- uint8_t readRegister(uint8_t address);
- void writeRegister(uint8_t address, uint8_t value);
- int _units;
- float _error;
-};
-
-#endif