Nicolas Farabegoli / AD9837

Library for interfacing with AD9837, generate Sine/Triangular/Square wave

AD9837.cpp@0:fdfd54fe27dc, 2015-06-30 (annotated)

Committer:
nicolas97
Date:
Tue Jun 30 08:25:56 2015 +0000
Revision:
0:fdfd54fe27dc
Library to interface with AD9837 (function generator)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nicolas97 0:fdfd54fe27dc 1 #include "AD9837.h"
nicolas97 0:fdfd54fe27dc 2 #include "mbed.h"
nicolas97 0:fdfd54fe27dc 3
nicolas97 0:fdfd54fe27dc 4 #define REG_FREQ1 0x8000
nicolas97 0:fdfd54fe27dc 5 #define REG_FREQ0 0x4000
nicolas97 0:fdfd54fe27dc 6 #define REG_PHASE0 0xC000
nicolas97 0:fdfd54fe27dc 7 #define REG_PHASE1 0xE000
nicolas97 0:fdfd54fe27dc 8
nicolas97 0:fdfd54fe27dc 9 #define REG_B28 0x2000
nicolas97 0:fdfd54fe27dc 10 #define REG_HLB 0x1000
nicolas97 0:fdfd54fe27dc 11 #define REG_FSEL 0x0800
nicolas97 0:fdfd54fe27dc 12 #define REG_PSEL 0x0400
nicolas97 0:fdfd54fe27dc 13 #define REG_PINSW 0x0200
nicolas97 0:fdfd54fe27dc 14 #define REG_RESET 0x0100
nicolas97 0:fdfd54fe27dc 15 #define REG_SLEEP1 0x0080
nicolas97 0:fdfd54fe27dc 16 #define REG_SLEEP12 0x0040
nicolas97 0:fdfd54fe27dc 17 #define REG_OPBITEN 0x0020
nicolas97 0:fdfd54fe27dc 18 #define REG_SIGNPIB 0x0010
nicolas97 0:fdfd54fe27dc 19 #define REG_DIV2 0x0008
nicolas97 0:fdfd54fe27dc 20 #define REG_MODE 0x0002
nicolas97 0:fdfd54fe27dc 21
nicolas97 0:fdfd54fe27dc 22 #define SIGN_OUTPUT_MASK (REG_OPBITEN | REG_SIGNPIB | REG_DIV2 | REG_MODE)
nicolas97 0:fdfd54fe27dc 23
nicolas97 0:fdfd54fe27dc 24 AD9837::AD9837(PinName mosi, PinName miso, PinName sclk, PinName cs) : _spi(mosi, miso, sclk), _cs(cs) {
nicolas97 0:fdfd54fe27dc 25
nicolas97 0:fdfd54fe27dc 26 _spi.format(8, 2);
nicolas97 0:fdfd54fe27dc 27 _spi.frequency(1000000);
nicolas97 0:fdfd54fe27dc 28 }
nicolas97 0:fdfd54fe27dc 29
nicolas97 0:fdfd54fe27dc 30 void AD9837::writeReg(uint16_t value)
nicolas97 0:fdfd54fe27dc 31 {
nicolas97 0:fdfd54fe27dc 32 _cs=0;
nicolas97 0:fdfd54fe27dc 33 wait_us(10);
nicolas97 0:fdfd54fe27dc 34 _spi.write(value >> 8);
nicolas97 0:fdfd54fe27dc 35 _spi.write(value & 0xFF);
nicolas97 0:fdfd54fe27dc 36 wait_us(10);
nicolas97 0:fdfd54fe27dc 37 _cs=1;
nicolas97 0:fdfd54fe27dc 38 }
nicolas97 0:fdfd54fe27dc 39
nicolas97 0:fdfd54fe27dc 40 void AD9837::setFrequencyWord(unsigned int reg, uint32_t frequency)
nicolas97 0:fdfd54fe27dc 41 {
nicolas97 0:fdfd54fe27dc 42 writeReg((reg?REG_FREQ1:REG_FREQ0) | (frequency & 0x3FFF));
nicolas97 0:fdfd54fe27dc 43 writeReg((reg?REG_FREQ1:REG_FREQ0) | ((frequency >> 14) & 0x3FFF));
nicolas97 0:fdfd54fe27dc 44 }
nicolas97 0:fdfd54fe27dc 45
nicolas97 0:fdfd54fe27dc 46 void AD9837::setPhaseWord(unsigned int reg, uint32_t phase)
nicolas97 0:fdfd54fe27dc 47 {
nicolas97 0:fdfd54fe27dc 48 writeReg((reg?REG_PHASE1:REG_PHASE0) | (phase & 0x0FFF));
nicolas97 0:fdfd54fe27dc 49 }
nicolas97 0:fdfd54fe27dc 50
nicolas97 0:fdfd54fe27dc 51 void AD9837::setSignOutput(SignOutput out)
nicolas97 0:fdfd54fe27dc 52 {
nicolas97 0:fdfd54fe27dc 53 m_reg = (m_reg & ~SIGN_OUTPUT_MASK) | out;
nicolas97 0:fdfd54fe27dc 54 writeReg(m_reg);
nicolas97 0:fdfd54fe27dc 55 }
nicolas97 0:fdfd54fe27dc 56
nicolas97 0:fdfd54fe27dc 57 void AD9837::setOutputMode(OutputMode out)
nicolas97 0:fdfd54fe27dc 58 {
nicolas97 0:fdfd54fe27dc 59 if(out == OUTPUT_MODE_TRIANGLE) {
nicolas97 0:fdfd54fe27dc 60 m_reg = (m_reg & ~SIGN_OUTPUT_MASK) | out;
nicolas97 0:fdfd54fe27dc 61 } if(out == OUTPUT_MODE_SINE) {
nicolas97 0:fdfd54fe27dc 62 m_reg &= ~REG_MODE;
nicolas97 0:fdfd54fe27dc 63 }else {
nicolas97 0:fdfd54fe27dc 64 m_reg = 0x2A;
nicolas97 0:fdfd54fe27dc 65 }
nicolas97 0:fdfd54fe27dc 66 writeReg(m_reg);
nicolas97 0:fdfd54fe27dc 67 }