不韋 呂 / UIT_ADDA

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

DAC_MCP4922.hpp@8:f933fcd30408, 2014-11-12 (annotated)

Committer:
MikamiUitOpen
Date:
Wed Nov 12 08:56:31 2014 +0000
Revision:
8:f933fcd30408
Parent:
3:77bc5550dc10
Child:
14:6c60601c1834
9

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:6e0ed5adfe47 1 //------------------------------------------------------
MikamiUitOpen 0:6e0ed5adfe47 2 // Class for single DAC in MCP4922 -- Header
MikamiUitOpen 0:6e0ed5adfe47 3 // Fast version
MikamiUitOpen 0:6e0ed5adfe47 4 //
MikamiUitOpen 0:6e0ed5adfe47 5 // Default pin assign
MikamiUitOpen 0:6e0ed5adfe47 6 // D11 SPI Master Out Slave In
MikamiUitOpen 0:6e0ed5adfe47 7 // D13 SPI Serial Clock
MikamiUitOpen 8:f933fcd30408 8 // D10 SPI Slave Select
MikamiUitOpen 8:f933fcd30408 9 // D12 to MCP4922 LDAC pin
MikamiUitOpen 0:6e0ed5adfe47 10 //
MikamiUitOpen 8:f933fcd30408 11 // Argument cs in constructor must be output of TIM4,
MikamiUitOpen 8:f933fcd30408 12 // i.e. D10(PB_6), PB_7, D15(PB_8), or D14(PB_9)
MikamiUitOpen 8:f933fcd30408 13 //
MikamiUitOpen 8:f933fcd30408 14 // Clock for Switched-capacitor filter:
MikamiUitOpen 8:f933fcd30408 15 // Output pin: D9 (PC7) ------ TIM3 CH2
MikamiUitOpen 8:f933fcd30408 16 //
MikamiUitOpen 8:f933fcd30408 17 // 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:6e0ed5adfe47 18 //------------------------------------------------------
MikamiUitOpen 0:6e0ed5adfe47 19
MikamiUitOpen 0:6e0ed5adfe47 20 #ifndef DAC_MCP4922_HPP
MikamiUitOpen 0:6e0ed5adfe47 21 #define DAC_MCP4922_HPP
MikamiUitOpen 0:6e0ed5adfe47 22
MikamiUitOpen 0:6e0ed5adfe47 23 #include "mbed.h"
MikamiUitOpen 0:6e0ed5adfe47 24 #include "tim4_slaveSelect.hpp"
MikamiUitOpen 0:6e0ed5adfe47 25
MikamiUitOpen 0:6e0ed5adfe47 26 namespace Mikami
MikamiUitOpen 0:6e0ed5adfe47 27 {
MikamiUitOpen 0:6e0ed5adfe47 28 class DAC_MCP4922
MikamiUitOpen 0:6e0ed5adfe47 29 {
MikamiUitOpen 0:6e0ed5adfe47 30 public:
MikamiUitOpen 0:6e0ed5adfe47 31 enum DAC { DAC_A = 0, DAC_B = 0x8000 };
MikamiUitOpen 0:6e0ed5adfe47 32
MikamiUitOpen 0:6e0ed5adfe47 33 // Constructor
MikamiUitOpen 0:6e0ed5adfe47 34 DAC_MCP4922(
MikamiUitOpen 3:77bc5550dc10 35 DAC dac = DAC_A, // channel A
MikamiUitOpen 0:6e0ed5adfe47 36 PinName mosi = SPI_MOSI, // D11
MikamiUitOpen 0:6e0ed5adfe47 37 PinName sclk = SPI_SCK, // D13
MikamiUitOpen 0:6e0ed5adfe47 38 PinName cs = SPI_CS, // D10
MikamiUitOpen 0:6e0ed5adfe47 39 PinName ldac = SPI_MISO, // D12
MikamiUitOpen 0:6e0ed5adfe47 40 int hz = 21000000); // 21 MHz
MikamiUitOpen 0:6e0ed5adfe47 41
MikamiUitOpen 0:6e0ed5adfe47 42 // -1.0f <= value <= 1.0f
MikamiUitOpen 0:6e0ed5adfe47 43 void Write(float value);
MikamiUitOpen 0:6e0ed5adfe47 44 // 0 <= value <= 4095
MikamiUitOpen 0:6e0ed5adfe47 45 void Write(uint16_t value);
MikamiUitOpen 2:2a3b4ed3eb58 46
MikamiUitOpen 0:6e0ed5adfe47 47 // generate LDAC negative-going pulse
MikamiUitOpen 0:6e0ed5adfe47 48 void Ldac();
MikamiUitOpen 0:6e0ed5adfe47 49
MikamiUitOpen 0:6e0ed5adfe47 50 // Check busy
MikamiUitOpen 0:6e0ed5adfe47 51 bool IsBusy()
MikamiUitOpen 0:6e0ed5adfe47 52 { return (mySpi_->SR & SPI_FLAG_BSY) == SPI_FLAG_BSY; }
MikamiUitOpen 8:f933fcd30408 53
MikamiUitOpen 8:f933fcd30408 54 // Set clock for switched-capacitor filter
MikamiUitOpen 8:f933fcd30408 55 void ScfClockTim3(uint32_t clock);
MikamiUitOpen 8:f933fcd30408 56
MikamiUitOpen 0:6e0ed5adfe47 57
MikamiUitOpen 0:6e0ed5adfe47 58 private:
MikamiUitOpen 0:6e0ed5adfe47 59 uint16_t wcr_; // write command register
MikamiUitOpen 0:6e0ed5adfe47 60 SPI spi_; // SPI object of mbed
MikamiUitOpen 2:2a3b4ed3eb58 61 Tim4_ss* ss_;
MikamiUitOpen 0:6e0ed5adfe47 62 DigitalOut ld_; // for LDAC
MikamiUitOpen 0:6e0ed5adfe47 63
MikamiUitOpen 0:6e0ed5adfe47 64 // Pointer of I2C
MikamiUitOpen 0:6e0ed5adfe47 65 SPI_TypeDef* mySpi_;
MikamiUitOpen 0:6e0ed5adfe47 66
MikamiUitOpen 0:6e0ed5adfe47 67 // for inhibition of copy constructor
MikamiUitOpen 0:6e0ed5adfe47 68 DAC_MCP4922(const DAC_MCP4922&);
MikamiUitOpen 0:6e0ed5adfe47 69 // for inhibition of substitute operator
MikamiUitOpen 2:2a3b4ed3eb58 70 DAC_MCP4922& operator=(const DAC_MCP4922&);
MikamiUitOpen 2:2a3b4ed3eb58 71
MikamiUitOpen 0:6e0ed5adfe47 72 // for internal use
MikamiUitOpen 0:6e0ed5adfe47 73 void WriteDac(uint16_t value);
MikamiUitOpen 0:6e0ed5adfe47 74 };
MikamiUitOpen 0:6e0ed5adfe47 75 }
MikamiUitOpen 0:6e0ed5adfe47 76 #endif // DAC_MCP4922_HPP