Rolando Pelayo / Mbed 2 deprecated sine_wave_generator

A sine wave generator using AD9833 and AD9850 using STM32F103RB

Dependencies:   mbed

This is a sine wave generator using DDS IC' AD9833 and AD9850. The STM32F1 microcontroller produces the SPI commands for the two DDS.

Learn more about STM32F1 in my blog: https://www.teachmemicro.com

AD9833.h@2:602f7589c53e, 2017-11-21 (annotated)

Committer:
roland_tmm
Date:
Tue Nov 21 19:18:25 2017 +0000
Revision:
2:602f7589c53e
Parent:
0:6069c0f2a245 
Edited comments/description;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
roland_tmm 2:602f7589c53e 1 /* AD9833 library for STM3F103
roland_tmm 0:6069c0f2a245 2 * AD9833.h
roland_tmm 2:602f7589c53e 3 * Roland Pelayo
roland_tmm 2:602f7589c53e 4 *
roland_tmm 2:602f7589c53e 5 * Based on the library from Bill Williams <wlwilliams1952@gmail.com, github/BillWilliams1952>
roland_tmm 2:602f7589c53e 6 *
roland_tmm 0:6069c0f2a245 7 * This program is free software; you can redistribute it and/or modify
roland_tmm 0:6069c0f2a245 8 * it under the terms of the GNU General Public License as published by
roland_tmm 0:6069c0f2a245 9 * the Free Software Foundation; either version 2 of the License, or
roland_tmm 0:6069c0f2a245 10 * (at your option) any later version.
roland_tmm 0:6069c0f2a245 11 *
roland_tmm 0:6069c0f2a245 12 * This program is distributed in the hope that it will be useful,
roland_tmm 0:6069c0f2a245 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
roland_tmm 0:6069c0f2a245 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
roland_tmm 0:6069c0f2a245 15 * GNU General Public License for more details.
roland_tmm 0:6069c0f2a245 16 *
roland_tmm 0:6069c0f2a245 17 * You should have received a copy of the GNU General Public License
roland_tmm 0:6069c0f2a245 18 * along with this program; if not, write to the Free Software
roland_tmm 0:6069c0f2a245 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
roland_tmm 0:6069c0f2a245 20 * MA 02110-1301, USA.
roland_tmm 0:6069c0f2a245 21 *
roland_tmm 0:6069c0f2a245 22 *
roland_tmm 0:6069c0f2a245 23 */
roland_tmm 0:6069c0f2a245 24
roland_tmm 0:6069c0f2a245 25 #ifndef __AD9833__
roland_tmm 0:6069c0f2a245 26
roland_tmm 0:6069c0f2a245 27 #define __AD9833__
roland_tmm 0:6069c0f2a245 28
roland_tmm 0:6069c0f2a245 29 #include "mbed.h"
roland_tmm 0:6069c0f2a245 30
roland_tmm 0:6069c0f2a245 31 //#define FNC_PIN 4 // Define FNC_PIN for fast digital writes
roland_tmm 0:6069c0f2a245 32
roland_tmm 0:6069c0f2a245 33 //#ifdef FNC_PIN
roland_tmm 0:6069c0f2a245 34 // Use digitalWriteFast for a speedup
roland_tmm 0:6069c0f2a245 35 // #include "digitalWriteFast.h"
roland_tmm 0:6069c0f2a245 36 // #define WRITE_FNCPIN(Val) digitalWriteFast2(FNC_PIN,(Val))
roland_tmm 0:6069c0f2a245 37 //#else // otherwise, just use digitalWrite
roland_tmm 0:6069c0f2a245 38 // #define WRITE_FNCPIN(Val) digitalWrite(FNCpin,(Val))
roland_tmm 0:6069c0f2a245 39 //#endif
roland_tmm 0:6069c0f2a245 40
roland_tmm 0:6069c0f2a245 41 #define pow2_28 268435456L // 2^28 used in frequency word calculation
roland_tmm 0:6069c0f2a245 42 #define BITS_PER_DEG 11.3777777777778 // 4096 / 360
roland_tmm 0:6069c0f2a245 43
roland_tmm 0:6069c0f2a245 44 #define RESET_CMD 0x0100 // Reset enabled (also CMD RESET)
roland_tmm 0:6069c0f2a245 45 /* Sleep mode
roland_tmm 0:6069c0f2a245 46 * D7 1 = internal clock is disabled
roland_tmm 0:6069c0f2a245 47 * D6 1 = put DAC to sleep
roland_tmm 0:6069c0f2a245 48 */
roland_tmm 0:6069c0f2a245 49 #define SLEEP_MODE 0x00C0 // Both DAC and Internal Clock
roland_tmm 0:6069c0f2a245 50 #define DISABLE_DAC 0x0040
roland_tmm 0:6069c0f2a245 51 #define DISABLE_INT_CLK 0x0080
roland_tmm 0:6069c0f2a245 52
roland_tmm 0:6069c0f2a245 53 #define PHASE_WRITE_CMD 0xC000 // Setup for Phase write
roland_tmm 0:6069c0f2a245 54 #define PHASE1_WRITE_REG 0x2000 // Which phase register
roland_tmm 0:6069c0f2a245 55 #define FREQ0_WRITE_REG 0x4000 //
roland_tmm 0:6069c0f2a245 56 #define FREQ1_WRITE_REG 0x8000
roland_tmm 0:6069c0f2a245 57 #define PHASE1_OUTPUT_REG 0x0400 // Output is based off REG0/REG1
roland_tmm 0:6069c0f2a245 58 #define FREQ1_OUTPUT_REG 0x0800 // ditto
roland_tmm 0:6069c0f2a245 59
roland_tmm 0:6069c0f2a245 60 typedef enum { SINE_WAVE = 0x2000, TRIANGLE_WAVE = 0x2002,
roland_tmm 0:6069c0f2a245 61 SQUARE_WAVE = 0x2028, HALF_SQUARE_WAVE = 0x2020 } WaveformType;
roland_tmm 0:6069c0f2a245 62
roland_tmm 0:6069c0f2a245 63 typedef enum { REG0, REG1, SAME_AS_REG0 } Registers;
roland_tmm 0:6069c0f2a245 64
roland_tmm 0:6069c0f2a245 65 class AD9833 {
roland_tmm 0:6069c0f2a245 66
roland_tmm 0:6069c0f2a245 67 public:
roland_tmm 0:6069c0f2a245 68
roland_tmm 0:6069c0f2a245 69 AD9833 (uint32_t referenceFrequency = 25000000UL );
roland_tmm 0:6069c0f2a245 70
roland_tmm 0:6069c0f2a245 71 // Must be the first command after creating the AD9833 object.
roland_tmm 0:6069c0f2a245 72 void Begin ( void );
roland_tmm 0:6069c0f2a245 73
roland_tmm 0:6069c0f2a245 74 // Setup and apply a signal. Note that any calls to EnableOut,
roland_tmm 0:6069c0f2a245 75 // SleepMode, DisableDAC, or DisableInternalClock remain in effect
roland_tmm 0:6069c0f2a245 76 void ApplySignal ( WaveformType waveType, Registers freqReg,
roland_tmm 0:6069c0f2a245 77 float frequencyInHz,
roland_tmm 0:6069c0f2a245 78 Registers phaseReg = SAME_AS_REG0, float phaseInDeg = 0.0 );
roland_tmm 0:6069c0f2a245 79
roland_tmm 0:6069c0f2a245 80 // Resets internal registers to 0, which corresponds to an output of
roland_tmm 0:6069c0f2a245 81 // midscale - digital output at 0. See EnableOutput function
roland_tmm 0:6069c0f2a245 82 void Reset ( void );
roland_tmm 0:6069c0f2a245 83
roland_tmm 0:6069c0f2a245 84 // Update just the frequency in REG0 or REG1
roland_tmm 0:6069c0f2a245 85 void SetGENFrequency ( Registers freqReg, float frequency );
roland_tmm 0:6069c0f2a245 86
roland_tmm 0:6069c0f2a245 87 // Increment the selected frequency register by freqIncHz
roland_tmm 0:6069c0f2a245 88 void IncrementFrequency ( Registers freqReg, float freqIncHz );
roland_tmm 0:6069c0f2a245 89
roland_tmm 0:6069c0f2a245 90 // Update just the phase in REG0 or REG1
roland_tmm 0:6069c0f2a245 91 void SetPhase ( Registers phaseReg, float phaseInDeg );
roland_tmm 0:6069c0f2a245 92
roland_tmm 0:6069c0f2a245 93 // Increment the selected phase register by phaseIncDeg
roland_tmm 0:6069c0f2a245 94 void IncrementPhase ( Registers phaseReg, float phaseIncDeg );
roland_tmm 0:6069c0f2a245 95
roland_tmm 0:6069c0f2a245 96 // Set the output waveform for the selected frequency register
roland_tmm 0:6069c0f2a245 97 // SINE_WAVE, TRIANGLE_WAVE, SQUARE_WAVE, HALF_SQUARE_WAVE,
roland_tmm 0:6069c0f2a245 98 void SetWaveform ( Registers waveFormReg, WaveformType waveType );
roland_tmm 0:6069c0f2a245 99
roland_tmm 0:6069c0f2a245 100 // Output based on the contents of REG0 or REG1
roland_tmm 0:6069c0f2a245 101 void SetOutputSource ( Registers freqReg, Registers phaseReg = SAME_AS_REG0 );
roland_tmm 0:6069c0f2a245 102
roland_tmm 0:6069c0f2a245 103 // Turn ON / OFF output using the RESET command.
roland_tmm 0:6069c0f2a245 104 void EnableOutput ( bool enable );
roland_tmm 0:6069c0f2a245 105
roland_tmm 0:6069c0f2a245 106 // Enable/disable Sleep mode. Internal clock and DAC disabled
roland_tmm 0:6069c0f2a245 107 void SleepMode ( bool enable );
roland_tmm 0:6069c0f2a245 108
roland_tmm 0:6069c0f2a245 109 // Enable / Disable DAC
roland_tmm 0:6069c0f2a245 110 void DisableDAC ( bool enable );
roland_tmm 0:6069c0f2a245 111
roland_tmm 0:6069c0f2a245 112 // Enable / Disable Internal Clock
roland_tmm 0:6069c0f2a245 113 void DisableInternalClock ( bool enable );
roland_tmm 0:6069c0f2a245 114
roland_tmm 0:6069c0f2a245 115 // Return actual frequency programmed in register
roland_tmm 0:6069c0f2a245 116 float GetActualProgrammedFrequency ( Registers reg );
roland_tmm 0:6069c0f2a245 117
roland_tmm 0:6069c0f2a245 118 // Return actual phase programmed in register
roland_tmm 0:6069c0f2a245 119 float GetActualProgrammedPhase ( Registers reg );
roland_tmm 0:6069c0f2a245 120
roland_tmm 0:6069c0f2a245 121 // Return frequency resolution
roland_tmm 0:6069c0f2a245 122 float GetResolution ( void );
roland_tmm 0:6069c0f2a245 123
roland_tmm 0:6069c0f2a245 124 private:
roland_tmm 0:6069c0f2a245 125
roland_tmm 0:6069c0f2a245 126 //Write to FNCpin
roland_tmm 0:6069c0f2a245 127 void FNCWrite(int val);
roland_tmm 0:6069c0f2a245 128 void WriteRegister ( int16_t dat );
roland_tmm 0:6069c0f2a245 129 void WriteControlRegister ( void );
roland_tmm 0:6069c0f2a245 130 uint16_t waveForm0, waveForm1;
roland_tmm 0:6069c0f2a245 131 uint8_t outputEnabled, DacDisabled, IntClkDisabled;
roland_tmm 0:6069c0f2a245 132 uint32_t refFrequency;
roland_tmm 0:6069c0f2a245 133 float frequency0, frequency1, phase0, phase1;
roland_tmm 0:6069c0f2a245 134 Registers activeFreq, activePhase;
roland_tmm 0:6069c0f2a245 135 };
roland_tmm 0:6069c0f2a245 136
roland_tmm 0:6069c0f2a245 137 #endif