Class library for internal ADC and DAC connected by SPI. ADC is triggered by TIM2. This library support clock generator using TIM3 for switched-capacitor filter to smooth output signal of DAC. This library includes derivative class to support interrupt occured in end of AD conversion. Slave select of SPI for DAC is generated using TIM4. Validated for ST Nucleo F401RE, F411RE. New version. 内蔵 ADC と,SPI 接続の DAC のためのクラスライブラリ.ADC の変換開始トリガは TIM2 で発生.DAC の出力信号を平滑化するためのスイッチトキャパシタフィルタ用のクロックは TIM3 を使用.DAC の SPI 用スレーブ選択信号は TIM4 で発生.ST Nucleo F401RE,F411RE で動作を確認.新バージョン
Dependents: UIT2_MovingAverage UIT2_AllpassReverb UIT2_CombReverb UIT2_FIR_LPF_Symmetry ... more
Diff: DAC_MCP4922.hpp
- Revision:
- 0:6e0ed5adfe47
- Child:
- 2:2a3b4ed3eb58
diff -r 000000000000 -r 6e0ed5adfe47 DAC_MCP4922.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DAC_MCP4922.hpp Mon Oct 20 03:01:11 2014 +0000 @@ -0,0 +1,72 @@ +//------------------------------------------------------ +// Class for single DAC in MCP4922 -- Header +// Fast version +// +// Default pin assign +// D11 SPI Master Out Slave In +// D13 SPI Serial Clock +// D12 SPI Slave Select +// D10 to MCP4922 LDAC pin +// +// 2014/09/29, Copyright (c) 2014 MIKAMI, Naoki +//------------------------------------------------------ + +#ifndef DAC_MCP4922_HPP +#define DAC_MCP4922_HPP + +#include "mbed.h" +#include "tim4_slaveSelect.hpp" + +namespace Mikami +{ + class DAC_MCP4922 + { + public: + enum DAC { DAC_A = 0, DAC_B = 0x8000 }; + + // Constructor + DAC_MCP4922( + DAC dac, + PinName mosi = SPI_MOSI, // D11 + PinName sclk = SPI_SCK, // D13 + PinName cs = SPI_CS, // D10 + PinName ldac = SPI_MISO, // D12 + int hz = 21000000); // 21 MHz + + // -1.0f <= value <= 1.0f + void Write(float value); + // 0 <= value <= 4095 + void Write(uint16_t value); + + // generate LDAC negative-going pulse + void Ldac(); + + // LDAC to H + void LdacH() { ld_.write(1); } + // LDAC to L + void LdacL() { ld_.write(0); } + + // Check busy + bool IsBusy() + { return (mySpi_->SR & SPI_FLAG_BSY) == SPI_FLAG_BSY; } + + private: + uint16_t wcr_; // write command register + SPI spi_; // SPI object of mbed + Tim4_ss* ss_; // for slave select + DigitalOut ld_; // for LDAC + + // Pointer of I2C + SPI_TypeDef* mySpi_; + + // for inhibition of copy constructor + DAC_MCP4922(const DAC_MCP4922&); + // for inhibition of substitute operator + DAC_MCP4922& operator=(const DAC_MCP4922&); + + // for internal use + void WriteDac(uint16_t value); + }; +} +#endif // DAC_MCP4922_HPP +