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GitshaoxiangGitshaoxiang
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add DDS Unit example
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‎examples/Unit/DDS_AD9833/DDSUnit.cpp‎

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#include "DDSUnit.h"
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void DDSUnit::writeDDSReg(uint8_t addr, uint8_t data)
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{
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//Serial.printf("ADDR:%02X,DATA:%02X\r\n",addr,data);
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_pwire->beginTransmission(DDS_UNIT_I2CADDR);
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_pwire->write(addr);
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_pwire->write(data);
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_pwire->endTransmission();
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}
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void DDSUnit::writeDDSReg(uint8_t addr, uint8_t* data, size_t size )
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{
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_pwire->beginTransmission(DDS_UNIT_I2CADDR);
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_pwire->write(addr);
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for (size_t i = 0; i < size; i++)
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{
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_pwire->write(data[i]);
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}
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_pwire->endTransmission();
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}
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uint8_t DDSUnit::readDDSReg(uint8_t addr)
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{
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uint8_t data;
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_pwire->beginTransmission(DDS_UNIT_I2CADDR);
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_pwire->write(addr);
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_pwire->endTransmission();
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_pwire->requestFrom(DDS_UNIT_I2CADDR, 1);
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data = _pwire->read();
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_pwire->endTransmission();
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return data;
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}
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void DDSUnit::readDDSRegs(uint8_t addr,uint8_t* dataptr,uint8_t size)
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{
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_pwire->beginTransmission(DDS_UNIT_I2CADDR);
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_pwire->write(addr);
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_pwire->endTransmission();
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_pwire->requestFrom(DDS_UNIT_I2CADDR, (int)size);
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for (int i = 0; i < 6; i++)
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{
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dataptr[i] = _pwire->read();
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}
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_pwire->endTransmission();
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}
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int DDSUnit::begin( TwoWire *p )
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{
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_pwire = p;
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char snStr[7];
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memset(snStr,0,sizeof(char)*7);
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readDDSRegs(DDS_DESC_ADDR,(uint8_t*)snStr,6);
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String desc(snStr);
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Serial.printf("sn:%s\r\n",snStr);
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return ( desc == String("ad9833")) ? 0 : -1;
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}
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void DDSUnit::setFreq( uint8_t reg ,uint64_t freq )
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{
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freq = freq * 268435456 / DDS_FMCLK;
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uint8_t sendbuff[4] = {0,0,0,0};
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sendbuff[0] |= ((( freq >> 24 ) & 0xff ) | ( reg == 1 ) ? 0xC0 : 0x80 );
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sendbuff[1] |= (( freq >> 16 ) & 0xff );
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sendbuff[2] |= (( freq >> 8 ) & 0xff );
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sendbuff[3] |= ( freq & 0xff );
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writeDDSReg(DDS_FREQ_ADDR,sendbuff,4);
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}
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void DDSUnit::setPhase( uint8_t reg ,uint32_t phase )
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{
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uint8_t sendbuff[2] = {0,0};
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phase = phase * 2048 / 360;
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sendbuff[0] |= ((( phase >> 8 ) & 0xff ) | (( reg == 1 ) ? 0xC0 : 0x80 ));
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sendbuff[1] |= ( phase & 0xff );
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//Serial.printf("%02X %02X",sendbuff[0],sendbuff[1]);
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writeDDSReg(DDS_PHASE_ADDR,sendbuff,2);
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}
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void DDSUnit::setFreqAndPhase( uint8_t freg, uint64_t freq, uint8_t preg, uint32_t phase )
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{
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uint8_t sendbuff[6] = {0,0,0,0,0,0};
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freq = freq * 268435456 / DDS_FMCLK;
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sendbuff[0] |= ((( freq >> 24 ) & 0xff ) | ( freg == 1 ) ? 0xC0 : 0x80 );
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sendbuff[1] |= (( freq >> 16 ) & 0xff );
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sendbuff[2] |= (( freq >> 8 ) & 0xff );
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sendbuff[3] |= ( freq & 0xff );
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phase = phase * 2048 / 360;
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sendbuff[4] |= ((( phase >> 8 ) & 0xff ) | (( preg == 1 ) ? 0xC0 : 0x80 ));
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sendbuff[5] |= ( phase & 0xff );
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writeDDSReg(DDS_FREQ_ADDR,sendbuff,6);
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}
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void DDSUnit::setMode( DDSmode mode )
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{
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writeDDSReg(DDS_MODE_ADDE,0x80 | mode );
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}
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void DDSUnit::setCTRL(uint8_t ctrlbyte)
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{
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writeDDSReg(DDS_CTRL_ADDR,0x80 | ctrlbyte );
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}
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void DDSUnit::selectFreqReg( uint8_t num )
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{
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uint8_t reg = readDDSReg(DDS_CTRL_ADDR);
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reg &= (~0x40);
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writeDDSReg(DDS_CTRL_ADDR,reg | 0x80 | ( num == 1 ) ? 0x40 : 0 );
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}
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void DDSUnit::selectPhaseReg( uint8_t num )
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{
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uint8_t reg = readDDSReg(DDS_CTRL_ADDR);
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reg &= (~0x20);
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writeDDSReg(DDS_CTRL_ADDR, reg | 0x80 | ( num == 1 ) ? 0x20 : 0 );
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}
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void DDSUnit::quickOUT(DDSmode mode, uint64_t freq, uint32_t phase)
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{
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if( mode <= kSQUAREMode )
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{
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setFreqAndPhase(0,freq,0,phase);
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}
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writeDDSReg( 0x20,0x80 | mode );
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writeDDSReg( 0x21,0x80 );
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}
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void DDSUnit::OUT( uint8_t freqnum,uint8_t phasenum )
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{
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uint8_t reg = readDDSReg(DDS_CTRL_ADDR);
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reg &= (~0x60);
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writeDDSReg(DDS_CTRL_ADDR, reg | 0x80 | (( freqnum == 1 ) ? 0x40 : 0 ) | (( phasenum == 1 ) ? 0x20 : 0 ));
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}
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void DDSUnit::setSleep(uint8_t level)
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{
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uint8_t reg = readDDSReg(DDS_CTRL_ADDR);
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reg &= (~0x18);
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reg |= ( level == 1 ) ? 0x10 : 0;
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reg |= ( level == 2 ) ? 0x08 : 0;
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writeDDSReg( DDS_CTRL_ADDR, 0x80 | reg );
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}
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void DDSUnit::reset()
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{
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writeDDSReg(DDS_CTRL_ADDR,0x80 | 0x04 );
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}

‎examples/Unit/DDS_AD9833/DDSUnit.h‎

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#ifndef _DDSUNIT_H_
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#define _DDSUNIT_H_
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#include "Wire.h"
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#include "Arduino.h"
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#define DDS_UNIT_I2CADDR 0x31
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#define DDS_DESC_ADDR 0x10
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#define DDS_MODE_ADDE 0x20
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#define DDS_CTRL_ADDR 0x21
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#define DDS_FREQ_ADDR 0x30
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#define DDS_PHASE_ADDR 0x34
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#define DDS_FMCLK 10000000
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class DDSUnit
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{
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private:
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TwoWire *_pwire = nullptr;
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void writeDDSReg(uint8_t addr, uint8_t data);
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void writeDDSReg(uint8_t addr, uint8_t* data, size_t size );
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uint8_t readDDSReg(uint8_t addr);
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void readDDSRegs(uint8_t addr,uint8_t* dataptr,uint8_t size);
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public:
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enum DDSmode{
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kReservedMode = 0,
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kSINUSMode,
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kTRIANGLEMode,
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kSQUAREMode,
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kSAWTOOTHMode,//锯齿波不能调节频率相位，固定1.3k hz 0相位
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kDCMode,
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};
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DDSUnit(){};
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~DDSUnit(){};
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int begin( TwoWire *p = &Wire1);
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void setFreq( uint8_t reg ,uint64_t freq );
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void setPhase( uint8_t reg ,uint32_t phase );
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void setFreqAndPhase( uint8_t freg, uint64_t freq, uint8_t preg, uint32_t phase );
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void setMode(DDSmode mode);
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void setCTRL(uint8_t ctrlbyte);
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void selectFreqReg(uint8_t num);
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void selectPhaseReg(uint8_t num);
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void quickOUT(DDSmode mode, uint64_t freq, uint32_t phase);//默认0
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void OUT(uint8_t freqnum,uint8_t phasenum);
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void setSleep(uint8_t level);//1/2 1模式不输出保持最后一帧电平，2关闭时钟
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void reset();
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};
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#endif

‎examples/Unit/DDS_AD9833/DDS_AD9833.ino‎

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#include "M5Stack.h"
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#include "DDSUnit.h"
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extern const unsigned char sine[11849];
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extern const unsigned char square[18080];
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extern const unsigned char triangle[22645];
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extern const unsigned char sawtooth[20193];
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DDSUnit dds;
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int phase = 0;
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int freq = 10000;
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int modeIndex = 0;
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String modeName[] = {
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"Sine",
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"Square",
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"Triangle",
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"Sawtooth"
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};
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const unsigned char *waveIcon[] = {
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sine,
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square,
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triangle,
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sawtooth
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};
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void displayInfo() {
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M5.Lcd.fillRect(0,120,250,120,TFT_BLACK);
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M5.Lcd.drawJpg(waveIcon[modeIndex],sizeof(waveIcon[modeIndex]));
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M5.Lcd.setTextColor(TFT_GREEN);
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M5.Lcd.drawString("Wave: "+modeName[modeIndex],10,140);
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M5.Lcd.setTextColor(TFT_BLUE);
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M5.Lcd.drawString("Phase: "+String(phase),10,170);
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M5.Lcd.setTextColor(TFT_YELLOW);
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M5.Lcd.drawString("Freq: "+String(freq),10,200);
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}
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void changeWave(int expression) {
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switch (expression)
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{
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case 0:
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dds.quickOUT(DDSUnit::kSINUSMode, freq, phase);
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break;
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case 1:
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dds.quickOUT(DDSUnit::kSQUAREMode, freq, phase);
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break;
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case 2:
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dds.quickOUT(DDSUnit::kTRIANGLEMode, freq, phase);
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break;
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case 3:
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//SAWTOOTH WAVE Only support 13.6Khz
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freq = 13600;
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dds.quickOUT(DDSUnit::kSAWTOOTHMode, freq, phase);
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break;
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default:
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break;
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}
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displayInfo();
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}
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void uiInit() {
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M5.Lcd.fillScreen(BLACK);
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M5.Lcd.fillTriangle(250,200,250,230,270,215,TFT_GREEN);
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M5.Lcd.setTextFont(4);
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M5.Lcd.setTextDatum(CC_DATUM);
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}
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void setup()
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{
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M5.begin(true, true, true, true);
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uiInit();
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dds.begin(&Wire);
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changeWave(modeIndex);
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}
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void loop() {
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M5.update();
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if(M5.BtnA.wasPressed()){
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freq+=10000;
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changeWave(modeIndex);
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}
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if(M5.BtnB.wasPressed()){
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phase+=10;
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changeWave(modeIndex);
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}
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if( M5.BtnC.wasPressed())
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{
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if(modeIndex==3){
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freq=10000;
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}
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if(modeIndex<3){
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modeIndex++;
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}else{
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modeIndex=0;
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}
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changeWave(modeIndex);
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}
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}

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