不韋 呂
Nucleo-F446RE 内蔵の AD/DA を使うためのライブラリ．DA からの出力は，標本化周波数の４倍のレートで行う．出力の補間フィルタには直線位相の FIR フィルタを使用． このライブラリを登録した際のプログラム： Demo_F446_AD_DA_MultirateLinearPhase. Library for built-in ADC and DAC in Nucleo-F446RE. Sampling rate for DAC is four times of that for ADC. Interpolation filter for output is linear-phase FIR filter.
Dependents: Demo_F446_AD_DA_MultirateLinearPhase
Diff: F446_DAC.cpp
- Revision:
- 0:ad30ac2b412b
- Child:
- 1:cd42ecc1e174
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/F446_DAC.cpp Tue Jul 03 01:29:13 2018 +0000
@@ -0,0 +1,46 @@
+//--------------------------------------------------------
+// Class for buit-in single DAC on STM32F446
+//
+// STM32F446 内蔵の DAC 用のクラス
+// DAC_OUT1: A2 (PA_4)
+// DAC_OUT2: D13 (PA_5)
+//
+// 2018/04/16, Copyright (c) 2018 MIKAMI, Naoki
+//--------------------------------------------------------
+
+#include "F446_DAC.hpp"
+
+namespace Mikami
+{
+ DacF446::DacF446(PinName pin) : da_(pin)
+ {
+ if ( (pin != A2) && (pin != D13) )
+ {
+ fprintf(stderr, "Invalid pin name\r\n");
+ while (true) {}
+ }
+ if (pin == A2)
+ {
+ DAC->CR = DAC_CR_EN1 | DAC_CR_TEN1 | DAC_CR_TSEL1;
+ fpWriteDac = &DacF446::WriteDac1;
+ }
+ else
+ {
+ DAC->CR = DAC_CR_EN2 | DAC_CR_TEN2 | DAC_CR_TSEL2;
+ fpWriteDac = &DacF446::WriteDac2;
+ }
+ }
+
+ // DAC の CH1 へ出力する
+ void DacF446::WriteDac1(uint16_t val)
+ {
+ DAC->DHR12R1 = val;
+ DAC->SWTRIGR = DAC_SWTRIGR_SWTRIG1;
+ }
+ // DAC の CH2 へ出力する
+ void DacF446::WriteDac2(uint16_t val)
+ {
+ DAC->DHR12R2 = val;
+ DAC->SWTRIGR = DAC_SWTRIGR_SWTRIG2;
+ }
+}