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@14:6c60601c1834, 2014-12-21 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Dec 21 08:07:09 2014 +0000
Revision:
14:6c60601c1834
Parent:
8:f933fcd30408
Child:
16:0001d3e93bee
15

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 14:6c60601c1834 8 // D10 SPI Slave Select ----------------------- TIM4
MikamiUitOpen 8:f933fcd30408 9 // D12 to MCP4922 LDAC pin
MikamiUitOpen 14:6c60601c1834 10 // D9 clock for Switched-capacitor filter ---- TIM3
MikamiUitOpen 0:6e0ed5adfe47 11 //
MikamiUitOpen 8:f933fcd30408 12 // Argument cs in constructor must be output of TIM4,
MikamiUitOpen 8:f933fcd30408 13 // i.e. D10(PB_6), PB_7, D15(PB_8), or D14(PB_9)
MikamiUitOpen 8:f933fcd30408 14 //
MikamiUitOpen 14:6c60601c1834 15 // Argument pin in function ScfClockTim3() can be
MikamiUitOpen 14:6c60601c1834 16 // PA_6(D12), PB_4(D5), PC_6, PB_5(D4), PC_7(D9),
MikamiUitOpen 14:6c60601c1834 17 // PC_8, or PC_9
MikamiUitOpen 8:f933fcd30408 18 //
MikamiUitOpen 14:6c60601c1834 19 // 2014/12/21, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:6e0ed5adfe47 20 //------------------------------------------------------
MikamiUitOpen 0:6e0ed5adfe47 21
MikamiUitOpen 0:6e0ed5adfe47 22 #ifndef DAC_MCP4922_HPP
MikamiUitOpen 0:6e0ed5adfe47 23 #define DAC_MCP4922_HPP
MikamiUitOpen 0:6e0ed5adfe47 24
MikamiUitOpen 0:6e0ed5adfe47 25 #include "mbed.h"
MikamiUitOpen 0:6e0ed5adfe47 26 #include "tim4_slaveSelect.hpp"
MikamiUitOpen 0:6e0ed5adfe47 27
MikamiUitOpen 0:6e0ed5adfe47 28 namespace Mikami
MikamiUitOpen 0:6e0ed5adfe47 29 {
MikamiUitOpen 0:6e0ed5adfe47 30 class DAC_MCP4922
MikamiUitOpen 0:6e0ed5adfe47 31 {
MikamiUitOpen 0:6e0ed5adfe47 32 public:
MikamiUitOpen 0:6e0ed5adfe47 33 enum DAC { DAC_A = 0, DAC_B = 0x8000 };
MikamiUitOpen 0:6e0ed5adfe47 34
MikamiUitOpen 0:6e0ed5adfe47 35 // Constructor
MikamiUitOpen 0:6e0ed5adfe47 36 DAC_MCP4922(
MikamiUitOpen 3:77bc5550dc10 37 DAC dac = DAC_A, // channel A
MikamiUitOpen 0:6e0ed5adfe47 38 PinName mosi = SPI_MOSI, // D11
MikamiUitOpen 0:6e0ed5adfe47 39 PinName sclk = SPI_SCK, // D13
MikamiUitOpen 0:6e0ed5adfe47 40 PinName cs = SPI_CS, // D10
MikamiUitOpen 0:6e0ed5adfe47 41 PinName ldac = SPI_MISO, // D12
MikamiUitOpen 0:6e0ed5adfe47 42 int hz = 21000000); // 21 MHz
MikamiUitOpen 0:6e0ed5adfe47 43
MikamiUitOpen 0:6e0ed5adfe47 44 // -1.0f <= value <= 1.0f
MikamiUitOpen 0:6e0ed5adfe47 45 void Write(float value);
MikamiUitOpen 0:6e0ed5adfe47 46 // 0 <= value <= 4095
MikamiUitOpen 0:6e0ed5adfe47 47 void Write(uint16_t value);
MikamiUitOpen 2:2a3b4ed3eb58 48
MikamiUitOpen 0:6e0ed5adfe47 49 // generate LDAC negative-going pulse
MikamiUitOpen 0:6e0ed5adfe47 50 void Ldac();
MikamiUitOpen 0:6e0ed5adfe47 51
MikamiUitOpen 0:6e0ed5adfe47 52 // Check busy
MikamiUitOpen 0:6e0ed5adfe47 53 bool IsBusy()
MikamiUitOpen 0:6e0ed5adfe47 54 { return (mySpi_->SR & SPI_FLAG_BSY) == SPI_FLAG_BSY; }
MikamiUitOpen 8:f933fcd30408 55
MikamiUitOpen 8:f933fcd30408 56 // Set clock for switched-capacitor filter
MikamiUitOpen 14:6c60601c1834 57 void ScfClockTim3(uint32_t clock, PinName pin = D9);
MikamiUitOpen 8:f933fcd30408 58
MikamiUitOpen 0:6e0ed5adfe47 59
MikamiUitOpen 0:6e0ed5adfe47 60 private:
MikamiUitOpen 0:6e0ed5adfe47 61 uint16_t wcr_; // write command register
MikamiUitOpen 0:6e0ed5adfe47 62 SPI spi_; // SPI object of mbed
MikamiUitOpen 2:2a3b4ed3eb58 63 Tim4_ss* ss_;
MikamiUitOpen 0:6e0ed5adfe47 64 DigitalOut ld_; // for LDAC
MikamiUitOpen 0:6e0ed5adfe47 65
MikamiUitOpen 0:6e0ed5adfe47 66 // Pointer of I2C
MikamiUitOpen 0:6e0ed5adfe47 67 SPI_TypeDef* mySpi_;
MikamiUitOpen 0:6e0ed5adfe47 68
MikamiUitOpen 0:6e0ed5adfe47 69 // for inhibition of copy constructor
MikamiUitOpen 0:6e0ed5adfe47 70 DAC_MCP4922(const DAC_MCP4922&);
MikamiUitOpen 0:6e0ed5adfe47 71 // for inhibition of substitute operator
MikamiUitOpen 2:2a3b4ed3eb58 72 DAC_MCP4922& operator=(const DAC_MCP4922&);
MikamiUitOpen 2:2a3b4ed3eb58 73
MikamiUitOpen 0:6e0ed5adfe47 74 // for internal use
MikamiUitOpen 0:6e0ed5adfe47 75 void WriteDac(uint16_t value);
MikamiUitOpen 0:6e0ed5adfe47 76 };
MikamiUitOpen 0:6e0ed5adfe47 77 }
MikamiUitOpen 0:6e0ed5adfe47 78 #endif // DAC_MCP4922_HPP