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

ADC_Base.cpp@21:3731753ebf24, 2015-02-02 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Feb 02 23:33:01 2015 +0000
Revision:
21:3731753ebf24
Parent:
16:0001d3e93bee 
22

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:6e0ed5adfe47 1 //------------------------------------------------------
MikamiUitOpen 0:6e0ed5adfe47 2 // Class for ADC using TIM2 trigger
MikamiUitOpen 0:6e0ed5adfe47 3 // To get bit definition for register in
MikamiUitOpen 0:6e0ed5adfe47 4 // peripheral, see "stm32f401xe.h"
MikamiUitOpen 0:6e0ed5adfe47 5 //
MikamiUitOpen 15:ab7eb29b69ea 6 // 2014/12/31, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:6e0ed5adfe47 7 //------------------------------------------------------
MikamiUitOpen 0:6e0ed5adfe47 8
MikamiUitOpen 0:6e0ed5adfe47 9 #include "ADC_Base.hpp"
MikamiUitOpen 0:6e0ed5adfe47 10
MikamiUitOpen 0:6e0ed5adfe47 11 namespace Mikami
MikamiUitOpen 0:6e0ed5adfe47 12 {
MikamiUitOpen 0:6e0ed5adfe47 13 ADC_Base::ADC_Base(PinName pin1, int frequency,
MikamiUitOpen 0:6e0ed5adfe47 14 PinName pin2, PinName pin3)
MikamiUitOpen 15:ab7eb29b69ea 15 : adc_(pin1), myAdc_(ADC1)
MikamiUitOpen 0:6e0ed5adfe47 16 {
MikamiUitOpen 0:6e0ed5adfe47 17 myAdc_->CR2 = ADC_EXTERNALTRIGCONVEDGE_RISING // External Trigger on the rising edge
MikamiUitOpen 0:6e0ed5adfe47 18 | ADC_EXTERNALTRIGCONV_T2_TRGO // Use Timer2 TRGO event
MikamiUitOpen 0:6e0ed5adfe47 19 | ADC_CR2_ADON; // Enable ADC
MikamiUitOpen 0:6e0ed5adfe47 20
MikamiUitOpen 15:ab7eb29b69ea 21 ch1_ = GetChannelNumber(pin1);
MikamiUitOpen 13:f2b8af192558 22 if (pin2 != NC)
MikamiUitOpen 13:f2b8af192558 23 {
MikamiUitOpen 13:f2b8af192558 24 adc2_ = new AnalogIn(pin2);
MikamiUitOpen 15:ab7eb29b69ea 25 ch2_ = GetChannelNumber(pin2);
MikamiUitOpen 13:f2b8af192558 26 }
MikamiUitOpen 13:f2b8af192558 27 if (pin3 != NC)
MikamiUitOpen 13:f2b8af192558 28 {
MikamiUitOpen 13:f2b8af192558 29 adc3_ = new AnalogIn(pin3);
MikamiUitOpen 15:ab7eb29b69ea 30 ch3_ = GetChannelNumber(pin3);
MikamiUitOpen 13:f2b8af192558 31 }
MikamiUitOpen 0:6e0ed5adfe47 32 SetTim2(frequency);
MikamiUitOpen 0:6e0ed5adfe47 33 Select1stChannel();
MikamiUitOpen 0:6e0ed5adfe47 34 }
MikamiUitOpen 0:6e0ed5adfe47 35
MikamiUitOpen 13:f2b8af192558 36 // Extract channel number
MikamiUitOpen 15:ab7eb29b69ea 37 uint8_t ADC_Base::GetChannelNumber(PinName pin)
MikamiUitOpen 13:f2b8af192558 38 {
MikamiUitOpen 13:f2b8af192558 39 uint8_t ch = 0;
MikamiUitOpen 13:f2b8af192558 40 if ((pin & 0x30) == 0x00) ch = pin;
MikamiUitOpen 13:f2b8af192558 41 if ((pin & 0x30) == 0x10) ch = (pin & 0x01) + 8;
MikamiUitOpen 13:f2b8af192558 42 if ((pin & 0x30) == 0x20) ch = (pin & 0x07) + 10;
MikamiUitOpen 13:f2b8af192558 43 return ch;
MikamiUitOpen 13:f2b8af192558 44 }
MikamiUitOpen 13:f2b8af192558 45
MikamiUitOpen 0:6e0ed5adfe47 46 void ADC_Base::SetTim2(int frequency)
MikamiUitOpen 0:6e0ed5adfe47 47 {
MikamiUitOpen 0:6e0ed5adfe47 48 __TIM2_CLK_ENABLE(); // Supply clock, See "stm32f4xx_hal_rcc.h"
MikamiUitOpen 8:f933fcd30408 49
MikamiUitOpen 8:f933fcd30408 50 SystemCoreClockUpdate(); // Update core clock (for F411RE)
MikamiUitOpen 8:f933fcd30408 51 // See system_stm32f4xx.h
MikamiUitOpen 0:6e0ed5adfe47 52 TIM_TypeDef* myTim = TIM2;
MikamiUitOpen 0:6e0ed5adfe47 53
MikamiUitOpen 0:6e0ed5adfe47 54 myTim->CR2 = TIM_CR2_MMS_1; // Update event: as trigger out
MikamiUitOpen 4:6e228f373c6f 55 myTim->ARR = SystemCoreClock/frequency - 1; // Auto-reload
MikamiUitOpen 0:6e0ed5adfe47 56 myTim->PSC = 0; // Prescaler
MikamiUitOpen 0:6e0ed5adfe47 57 myTim->CR1 = TIM_CR1_CEN; // Enable TIM2
MikamiUitOpen 0:6e0ed5adfe47 58 }
MikamiUitOpen 0:6e0ed5adfe47 59 }