不韋 呂 / UITDSP_ADDA

Class library for internal ADC and DAC connected by SPI. 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. Validated for ST Nucleo F401RE, F411RE. 内蔵 ADC と，SPI 接続の DAC のためのクラスライブラリ．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．ST Nucleo F401RE，F411RE で動作を確認．

Dependents:   UITDSP_ADDA_Example UIT2_MovingAv_Intr UIT2_VariableFIR UIT2_VowelSynthesizer ... more

DAC_MCP4921.cpp@4:03c4518de836, 2015-03-16 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Mar 16 23:59:24 2015 +0000
Revision:
4:03c4518de836
Parent:
0:2cdd5c91d975
Child:
6:9deca4a06c8c
5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 4:03c4518de836 1 //------------------------------------------------------
MikamiUitOpen 4:03c4518de836 2 // Class for single DAC in MCP4921
MikamiUitOpen 0:2cdd5c91d975 3 //
MikamiUitOpen 4:03c4518de836 4 // 2015/02/02, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 4:03c4518de836 5 //------------------------------------------------------
MikamiUitOpen 0:2cdd5c91d975 6
MikamiUitOpen 0:2cdd5c91d975 7 #include "DAC_MCP4921.hpp"
MikamiUitOpen 0:2cdd5c91d975 8
MikamiUitOpen 0:2cdd5c91d975 9 namespace Mikami
MikamiUitOpen 0:2cdd5c91d975 10 {
MikamiUitOpen 0:2cdd5c91d975 11 DAC_MCP4921::DAC_MCP4921(PinName mosi, PinName sclk,
MikamiUitOpen 0:2cdd5c91d975 12 PinName cs, PinName ldac)
MikamiUitOpen 4:03c4518de836 13 : spi_(mosi, NC, sclk),
MikamiUitOpen 4:03c4518de836 14 ld_(ldac, 0), mySpi_((SPI_TypeDef*)NULL)
MikamiUitOpen 0:2cdd5c91d975 15 {
MikamiUitOpen 0:2cdd5c91d975 16 if ( (mosi == PA_7) || (mosi == PB_5) ) mySpi_ = SPI1;
MikamiUitOpen 0:2cdd5c91d975 17 if ( (mosi == PB_15) || (mosi == PC_3) ) mySpi_ = SPI2;
MikamiUitOpen 0:2cdd5c91d975 18 if ( mosi == PC_12 ) mySpi_ = SPI3;
MikamiUitOpen 0:2cdd5c91d975 19
MikamiUitOpen 0:2cdd5c91d975 20 // Set SPI format
MikamiUitOpen 0:2cdd5c91d975 21 spi_.format(16, 0);
MikamiUitOpen 0:2cdd5c91d975 22 // Clock source of F401 for SPI1 : 84 MHz,
MikamiUitOpen 0:2cdd5c91d975 23 // SPI2, SPI3 : 42 MHz
MikamiUitOpen 0:2cdd5c91d975 24 mySpi_->CR1 = (mySpi_->CR1 & ~SPI_CR1_BR);
MikamiUitOpen 0:2cdd5c91d975 25 if (mySpi_ == SPI1) mySpi_->CR1 += SPI_CR1_BR_0;
MikamiUitOpen 0:2cdd5c91d975 26 #ifdef __STM32F411xE_H
MikamiUitOpen 0:2cdd5c91d975 27 mySpi_->CR1 += SPI_CR1_BR_0;
MikamiUitOpen 0:2cdd5c91d975 28 #endif // __STM32F411xE_H
MikamiUitOpen 0:2cdd5c91d975 29
MikamiUitOpen 4:03c4518de836 30 // timer prescaler is set same value of boud rate for SPI
MikamiUitOpen 4:03c4518de836 31 uint16_t psc = (2 << ((mySpi_->CR1 >> 3) & 0x07)) - 1;
MikamiUitOpen 4:03c4518de836 32 if (mySpi_ != SPI1) psc = (psc + 1)*2 - 1;
MikamiUitOpen 4:03c4518de836 33 ss_ = new Tim4_ss(psc, 19, cs);
MikamiUitOpen 0:2cdd5c91d975 34 }
MikamiUitOpen 0:2cdd5c91d975 35
MikamiUitOpen 0:2cdd5c91d975 36 void DAC_MCP4921::ScfClockTim3(uint32_t clock, PinName pin)
MikamiUitOpen 0:2cdd5c91d975 37 {
MikamiUitOpen 0:2cdd5c91d975 38 if ( (pin != PA_6) && (pin != PB_4) && (pin != PB_5) &&
MikamiUitOpen 0:2cdd5c91d975 39 (pin != PC_6) && (pin != PC_7) && (pin != PC_8) && (pin != PC_9) )
MikamiUitOpen 0:2cdd5c91d975 40 {
MikamiUitOpen 4:03c4518de836 41 fprintf(stderr, "\r\nIllegal pin name in DAC_MCP4921::ScfClockTim3()\r\n");
MikamiUitOpen 0:2cdd5c91d975 42 while (true) {}
MikamiUitOpen 0:2cdd5c91d975 43 }
MikamiUitOpen 0:2cdd5c91d975 44
MikamiUitOpen 0:2cdd5c91d975 45 PwmOut clockSCF(pin);
MikamiUitOpen 0:2cdd5c91d975 46
MikamiUitOpen 0:2cdd5c91d975 47 TIM3->ARR = SystemCoreClock/clock - 1;
MikamiUitOpen 0:2cdd5c91d975 48 TIM3->PSC = 0;
MikamiUitOpen 0:2cdd5c91d975 49 // Set capture/compare register 2
MikamiUitOpen 0:2cdd5c91d975 50 if ( (pin == PA_6) || (pin == PB_4) || (pin == PC_6) )
MikamiUitOpen 0:2cdd5c91d975 51 TIM3->CCR1 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:2cdd5c91d975 52 if ( (pin == PB_5) || (pin == PC_7) )
MikamiUitOpen 0:2cdd5c91d975 53 TIM3->CCR2 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:2cdd5c91d975 54 if (pin == PC_8)
MikamiUitOpen 0:2cdd5c91d975 55 TIM3->CCR3 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:2cdd5c91d975 56 if (pin == PC_9)
MikamiUitOpen 0:2cdd5c91d975 57 TIM3->CCR4 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:2cdd5c91d975 58 }
MikamiUitOpen 0:2cdd5c91d975 59 }