Yuu Kobayashi / Mbed 2 deprecated NuMidi401

Nucleo F401REでFM音源を実装するやつ の実装途中で32ポリ音源にしたやつ 外部DACとオペアンプを利用 現在はMCP4922とNJM2737

Dependencies:   AOTTrigon I2CEEPROM MCP4922 mbed

Main.cpp@3:e98f2da2d3c5, 2014-12-23 (annotated)

Committer:
kb10uy
Date:
Tue Dec 23 05:32:48 2014 +0000
Revision:
3:e98f2da2d3c5
Parent:
2:658699249a81
Child:
4:e300f6fd7f96
change mcp4922 lib;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kb10uy 1:cde592d8076e 1 #include "Main.h"
kb10uy 1:cde592d8076e 2
kb10uy 3:e98f2da2d3c5 3 Ticker sampler;
kb10uy 3:e98f2da2d3c5 4 MCP4922 output(SPI_MOSI,SPI_SCK,SPI_CS);
kb10uy 3:e98f2da2d3c5 5 AOTTrigon t(1024);
kb10uy 3:e98f2da2d3c5 6
kb10uy 3:e98f2da2d3c5 7 const double smpps = 40000.0;
kb10uy 3:e98f2da2d3c5 8 const double smptime = 1.0 / smpps;
kb10uy 3:e98f2da2d3c5 9 const double smpus = 1000000.0 / smpps;
kb10uy 3:e98f2da2d3c5 10
kb10uy 3:e98f2da2d3c5 11 double ntime = 0.0;
kb10uy 3:e98f2da2d3c5 12 double freq = 1.0;
kb10uy 2:658699249a81 13
kb10uy 3:e98f2da2d3c5 14 void tick_sampling();
kb10uy 3:e98f2da2d3c5 15
kb10uy 3:e98f2da2d3c5 16 int main(){
kb10uy 3:e98f2da2d3c5 17 output.referenceMode(MCP4922::DAC_A, MCP4922::REF_UNBUFFERED);
kb10uy 3:e98f2da2d3c5 18 output.gainMode(MCP4922::DAC_A, MCP4922::GAIN_1X);
kb10uy 3:e98f2da2d3c5 19 output.powerMode(MCP4922::DAC_A, MCP4922::POWER_NORMAL);
kb10uy 3:e98f2da2d3c5 20 sampler.attach_us(&tick_sampling, smpus);
kb10uy 3:e98f2da2d3c5 21 }
kb10uy 3:e98f2da2d3c5 22
kb10uy 3:e98f2da2d3c5 23 void tick_sampling() {
kb10uy 3:e98f2da2d3c5 24 output.write(MCP4922::DAC_A, 0.5f/*t.sine(M_PI*2.0*freq*ntime)/2.0+0.5*/);
kb10uy 3:e98f2da2d3c5 25 ntime+=smptime;
kb10uy 1:cde592d8076e 26 }