不韋 呂
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
Diff: DAC_MCP4921.cpp
- Revision:
- 0:2cdd5c91d975
- Child:
- 4:03c4518de836
diff -r 000000000000 -r 2cdd5c91d975 DAC_MCP4921.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC_MCP4921.cpp Fri Feb 20 05:52:03 2015 +0000
@@ -0,0 +1,69 @@
+//--------------------------------------------------------------
+// Class for DAC MCP4921
+//
+// 2015/02/18, Copyright (c) 2015 MIKAMI, Naoki
+//--------------------------------------------------------------
+
+#include "InterruptManager.h"
+#include "DAC_MCP4921.hpp"
+
+namespace Mikami
+{
+ DAC_MCP4921::DAC_MCP4921(PinName mosi, PinName sclk,
+ PinName cs, PinName ldac)
+ : spi_(mosi, NC, sclk), ld_(ldac, 0)
+ {
+ if ( (mosi == PA_7) || (mosi == PB_5) ) mySpi_ = SPI1;
+ if ( (mosi == PB_15) || (mosi == PC_3) ) mySpi_ = SPI2;
+ if ( mosi == PC_12 ) mySpi_ = SPI3;
+
+ // Set SPI format
+ spi_.format(16, 0);
+ // Clock source of F401 for SPI1 : 84 MHz,
+ // SPI2, SPI3 : 42 MHz
+ mySpi_->CR1 = (mySpi_->CR1 & ~SPI_CR1_BR);
+ if (mySpi_ == SPI1) mySpi_->CR1 += SPI_CR1_BR_0;
+#ifdef __STM32F411xE_H
+ mySpi_->CR1 += SPI_CR1_BR_0;
+#endif // __STM32F411xE_H
+
+ cs_ = new DigitalOut(cs, 1);
+
+ mySpi_->CR2 |= SPI_CR2_RXNEIE; // Enable SPI RX buffer not empty interrupt
+
+ IRQn_Type irq = SPI1_IRQn;
+ if (mySpi_ == SPI2) irq = SPI2_IRQn;
+ if (mySpi_ == SPI3) irq = SPI3_IRQn;
+
+ NVIC_SetVector(irq, (uint32_t)Isr); // See "cmsis_nvic.h"
+ NVIC_EnableIRQ(irq); // See "core_cm4.h"
+ }
+
+ void DAC_MCP4921::ScfClockTim3(uint32_t clock, PinName pin)
+ {
+ if ( (pin != PA_6) && (pin != PB_4) && (pin != PB_5) &&
+ (pin != PC_6) && (pin != PC_7) && (pin != PC_8) && (pin != PC_9) )
+ {
+ fprintf(stderr, "\r\nIllegal pin name in DAC_MCP4922::ScfClockTim3()\r\n");
+ while (true) {}
+ }
+
+ PwmOut clockSCF(pin);
+
+ TIM3->ARR = SystemCoreClock/clock - 1;
+ TIM3->PSC = 0;
+ // Set capture/compare register 2
+ if ( (pin == PA_6) || (pin == PB_4) || (pin == PC_6) )
+ TIM3->CCR1 = (TIM3->ARR + 1)/2;
+ if ( (pin == PB_5) || (pin == PC_7) )
+ TIM3->CCR2 = (TIM3->ARR + 1)/2;
+ if (pin == PC_8)
+ TIM3->CCR3 = (TIM3->ARR + 1)/2;
+ if (pin == PC_9)
+ TIM3->CCR4 = (TIM3->ARR + 1)/2;
+ }
+
+ DigitalOut* DAC_MCP4921::cs_;
+ SPI_TypeDef* DAC_MCP4921::mySpi_;
+}
+