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Library to work with the LDC1000 from Texas Instruments
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):
- Setting the RpMAX and RpMIN values
- Setting the interrupt pin functionality
Revision 5:98d4fd07734a, committed 2015-05-26
- Comitter:
- hamid567
- Date:
- Tue May 26 14:34:05 2015 +0000
- Parent:
- 4:62ebb87678f8
- Child:
- 6:5b6ad98d6436
- Commit message:
- Set mode to standby before writing registers. Counter 1..0 not changing ?
Changed in this revision
| LDC1000.cpp | Show annotated file Show diff for this revision Revisions of this file |
| LDC1000.h | Show annotated file Show diff for this revision Revisions of this file |
--- 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);
--- a/LDC1000.h Tue May 19 14:10:01 2015 +0000
+++ b/LDC1000.h Tue May 26 14:34:05 2015 +0000
@@ -32,6 +32,8 @@
typedef enum { LDC_MODE_STANDBY = 0, LDC_MODE_ACTIVE = 1} LDC_MODE;
+typedef enum { WAKE_UP = 1, COMPARATOR = 2 , ACTIVE = 4} LDC_INTB;
+
/**
* Class for the LDC1000.
@@ -51,6 +53,7 @@
* @param mode choose from LDC_MODE_ACTIVE or LDC_MODE STANDBY
**/
void mode(LDC_MODE mode){writeSPI((uint8_t *)(&mode), 0x0B);};
+ void setINTB(LDC_INTB setINTB){writeSPI((uint8_t *)(&setINTB), 0x0A);};
/**
* @brief get the calculated inductance value
**/
@@ -70,6 +73,10 @@
* This is needed for the calculation of the inductance.
**/
uint32_t readRawL(void){_raw_l = readRawCounts(); return _raw_l;};
+
+ // EXTRA test Read INTB register
+ uint32_t readINTBregister(void){INTB = readINTB(); return INTB;};
+
/**
* @brief Set the Response Time parameters.
* @param responsetime
@@ -97,7 +104,9 @@
private:
void readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes = 1);
void writeSPI(uint8_t *data, uint8_t address, uint8_t num_bytes = 1);
+ void writeSPIregister(uint8_t reg, uint8_t value){writeSPI(&value,reg);};
uint32_t readRawCounts(void);
+ uint32_t readINTB(void); // EXTRA UNTB Read register
LDC_RESPONSE _responsetime;
LDC_AMPLITUDE _amplitude;
float _fsensor;
@@ -105,6 +114,7 @@
float _frequency; //frequency of external clock
float cap;
uint32_t _raw_l;
+ uint32_t INTB; // extra: read register INTB
SPI _spiport;
DigitalOut _cs_pin;
FastPWM _clock;
LDC1000