不韋 呂 / UITDSP_ADDA2

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Dependents:   UITDSP_ADDA_Example2

DAC_MCP4921.cpp@0:46d099dfd9d6, 2015-03-14 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Mar 14 06:49:49 2015 +0000
Revision:
0:46d099dfd9d6
Child:
1:e997f4e94491
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:46d099dfd9d6 1 //------------------------------------------------------
MikamiUitOpen 0:46d099dfd9d6 2 // Class for single DAC in MCP4921
MikamiUitOpen 0:46d099dfd9d6 3 //
MikamiUitOpen 0:46d099dfd9d6 4 // 2015/02/02, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:46d099dfd9d6 5 //------------------------------------------------------
MikamiUitOpen 0:46d099dfd9d6 6
MikamiUitOpen 0:46d099dfd9d6 7 #include "DAC_MCP4921.hpp"
MikamiUitOpen 0:46d099dfd9d6 8
MikamiUitOpen 0:46d099dfd9d6 9 namespace Mikami
MikamiUitOpen 0:46d099dfd9d6 10 {
MikamiUitOpen 0:46d099dfd9d6 11 DAC_MCP4921::DAC_MCP4921(PinName mosi, PinName sclk,
MikamiUitOpen 0:46d099dfd9d6 12 PinName cs, PinName ldac)
MikamiUitOpen 0:46d099dfd9d6 13 : spi_(mosi, NC, sclk),
MikamiUitOpen 0:46d099dfd9d6 14 ld_(ldac, 0), mySpi_((SPI_TypeDef*)NULL)
MikamiUitOpen 0:46d099dfd9d6 15 {
MikamiUitOpen 0:46d099dfd9d6 16 if ( (mosi == PA_7) || (mosi == PB_5) ) mySpi_ = SPI1;
MikamiUitOpen 0:46d099dfd9d6 17 if ( (mosi == PB_15) || (mosi == PC_3) ) mySpi_ = SPI2;
MikamiUitOpen 0:46d099dfd9d6 18 if ( mosi == PC_12 ) mySpi_ = SPI3;
MikamiUitOpen 0:46d099dfd9d6 19
MikamiUitOpen 0:46d099dfd9d6 20 // Set SPI format
MikamiUitOpen 0:46d099dfd9d6 21 spi_.format(16, 0);
MikamiUitOpen 0:46d099dfd9d6 22 // Clock source of F401 for SPI1 : 84 MHz,
MikamiUitOpen 0:46d099dfd9d6 23 // SPI2, SPI3 : 42 MHz
MikamiUitOpen 0:46d099dfd9d6 24 mySpi_->CR1 = (mySpi_->CR1 & ~SPI_CR1_BR);
MikamiUitOpen 0:46d099dfd9d6 25 if (mySpi_ == SPI1) mySpi_->CR1 += SPI_CR1_BR_0;
MikamiUitOpen 0:46d099dfd9d6 26 #ifdef __STM32F411xE_H
MikamiUitOpen 0:46d099dfd9d6 27 mySpi_->CR1 += SPI_CR1_BR_0;
MikamiUitOpen 0:46d099dfd9d6 28 #endif // __STM32F411xE_H
MikamiUitOpen 0:46d099dfd9d6 29
MikamiUitOpen 0:46d099dfd9d6 30 // timer prescaler is set same value of boud rate for SPI
MikamiUitOpen 0:46d099dfd9d6 31 uint16_t psc = (2 << ((mySpi_->CR1 >> 3) & 0x07)) - 1;
MikamiUitOpen 0:46d099dfd9d6 32 if (mySpi_ != SPI1) psc = (psc + 1)*2 - 1;
MikamiUitOpen 0:46d099dfd9d6 33 ss_ = new Tim4_ss(psc, 19, cs);
MikamiUitOpen 0:46d099dfd9d6 34 }
MikamiUitOpen 0:46d099dfd9d6 35
MikamiUitOpen 0:46d099dfd9d6 36 void DAC_MCP4921::ScfClockTim3(uint32_t clock, PinName pin)
MikamiUitOpen 0:46d099dfd9d6 37 {
MikamiUitOpen 0:46d099dfd9d6 38 if ( (pin != PA_6) && (pin != PB_4) && (pin != PB_5) &&
MikamiUitOpen 0:46d099dfd9d6 39 (pin != PC_6) && (pin != PC_7) && (pin != PC_8) && (pin != PC_9) )
MikamiUitOpen 0:46d099dfd9d6 40 {
MikamiUitOpen 0:46d099dfd9d6 41 fprintf(stderr, "\r\nIllegal pin name in DAC_MCP4921::ScfClockTim3()\r\n");
MikamiUitOpen 0:46d099dfd9d6 42 while (true) {}
MikamiUitOpen 0:46d099dfd9d6 43 }
MikamiUitOpen 0:46d099dfd9d6 44
MikamiUitOpen 0:46d099dfd9d6 45 PwmOut clockSCF(pin);
MikamiUitOpen 0:46d099dfd9d6 46
MikamiUitOpen 0:46d099dfd9d6 47 TIM3->ARR = SystemCoreClock/clock - 1;
MikamiUitOpen 0:46d099dfd9d6 48 TIM3->PSC = 0;
MikamiUitOpen 0:46d099dfd9d6 49 // Set capture/compare register 2
MikamiUitOpen 0:46d099dfd9d6 50 if ( (pin == PA_6) || (pin == PB_4) || (pin == PC_6) )
MikamiUitOpen 0:46d099dfd9d6 51 TIM3->CCR1 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:46d099dfd9d6 52 if ( (pin == PB_5) || (pin == PC_7) )
MikamiUitOpen 0:46d099dfd9d6 53 TIM3->CCR2 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:46d099dfd9d6 54 if (pin == PC_8)
MikamiUitOpen 0:46d099dfd9d6 55 TIM3->CCR3 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:46d099dfd9d6 56 if (pin == PC_9)
MikamiUitOpen 0:46d099dfd9d6 57 TIM3->CCR4 = (TIM3->ARR + 1)/2;
MikamiUitOpen 0:46d099dfd9d6 58 }
MikamiUitOpen 0:46d099dfd9d6 59 }