Library to work with the LDC1000 from Texas Instruments

Dependencies:   FastPWM

Dependents:   LDC1000_test

LDC1000

This library was written to interface to Texas Instruments' LDC1000 in order to perform inductance measurement. This libary needs a SPI peripheral on your mbed device to talk to the LDC1000.

Clock

The LDC1000 needs a high speed clock for its internal frequency counter. In order to provide this clock, the FastPWM library is used. This may change the behaviour of other PWM channels, please be aware of that, and read the FastPWM documentation to understand the implications.

Unsupported

Not supported (yet):

  1. Setting the RpMAX and RpMIN values
  2. Setting the interrupt pin functionality
Revision:
5:98d4fd07734a
Parent:
4:62ebb87678f8
Child:
6:5b6ad98d6436
diff -r 62ebb87678f8 -r 98d4fd07734a LDC1000.cpp
--- a/LDC1000.cpp	Tue May 19 14:10:01 2015 +0000
+++ b/LDC1000.cpp	Tue May 26 14:34:05 2015 +0000
@@ -18,11 +18,30 @@
     _spiport.frequency(1E6);
     _cs_pin.write(1);
     wait_us(100);
-    mode(LDC_MODE_ACTIVE);
+    mode(LDC_MODE_STANDBY);
+    setFrequency(f_external);
+   wait(0.1);
+    setOutputPower(LDC_AMPLITUDE_4V);
     wait_us(10);
-    setFrequency(f_external);
     setResponseTime(LDC_RESPONSE_384);
     setWatchdog(5000);
+    
+// Write comando's like in EVM start log:
+  /*  writeSPIregister(0x0B,0x00);
+    writeSPIregister(0x01,0x0E);
+    writeSPIregister(0x02,0x3C);
+    writeSPIregister(0x03,0x15);
+    writeSPIregister(0x04,0x17);
+    writeSPIregister(0x05,0x00);
+    writeSPIregister(0x06,0x50);
+    writeSPIregister(0x07,0x14);
+    writeSPIregister(0x08,0xC0);
+    writeSPIregister(0x09,0x12);
+    writeSPIregister(0x0A,0x04);
+//    writeSPIregister(0x0C,0x01);
+    writeSPIregister(0x0B,0x01);*/
+
+    mode(LDC_MODE_ACTIVE);
 }
 
 void LDC1000::setOutputPower(LDC_AMPLITUDE amplitude)
@@ -50,7 +69,7 @@
     _responsetime = responsetime;
     readSPI(&buffer, 0x04);
     buffer &= 0xF8; //clear responsetime bits
-    buffer |= responsetime & 0xF8;
+    buffer |= responsetime & 0x07;
     writeSPI(&buffer,0x04);
 }
 
@@ -81,6 +100,8 @@
     return val.value;
 }
 
+
+
 void LDC1000::readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
 {
     _cs_pin.write(0);