不韋 呂 / Mbed 2 deprecated SDR_FM_Tx

AM中波放送用SDR．CICフィルタのみを使用．CQ出版社「トランジスタ技術」誌，2021年5月号に掲載

Dependencies:   mbed

F446_DAC_Dual.hpp@0:7a653530c8ce, 2020-08-29 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Aug 29 11:26:29 2020 +0000
Revision:
0:7a653530c8ce
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:7a653530c8ce 1 //--------------------------------------------------------
MikamiUitOpen 0:7a653530c8ce 2 // STM32F446 内蔵の DAC 用のクラス
MikamiUitOpen 0:7a653530c8ce 3 // A2 (PA_4)： 左
MikamiUitOpen 0:7a653530c8ce 4 // D13 (PA_5)： 右
MikamiUitOpen 0:7a653530c8ce 5 // D13 は LD2 (緑) が接続されているため，高い電圧を出力した場合に
MikamiUitOpen 0:7a653530c8ce 6 // クリップされる．これを防止するためには SB21 を OFF にする
MikamiUitOpen 0:7a653530c8ce 7 //
MikamiUitOpen 0:7a653530c8ce 8 // 2020/08/11, Copyright (c) 2020 MIKAMI, Naoki
MikamiUitOpen 0:7a653530c8ce 9 //--------------------------------------------------------
MikamiUitOpen 0:7a653530c8ce 10
MikamiUitOpen 0:7a653530c8ce 11 #include "mbed.h"
MikamiUitOpen 0:7a653530c8ce 12
MikamiUitOpen 0:7a653530c8ce 13 #ifndef STM32F446xx
MikamiUitOpen 0:7a653530c8ce 14 #error Select NUCLEO-F446RE.
MikamiUitOpen 0:7a653530c8ce 15 #endif
MikamiUitOpen 0:7a653530c8ce 16
MikamiUitOpen 0:7a653530c8ce 17 #ifndef F446_DAC_DUAL_HPP
MikamiUitOpen 0:7a653530c8ce 18 #define F446_DAC_DUAL_HPP
MikamiUitOpen 0:7a653530c8ce 19
MikamiUitOpen 0:7a653530c8ce 20 namespace Mikami
MikamiUitOpen 0:7a653530c8ce 21 {
MikamiUitOpen 0:7a653530c8ce 22 class DacDual
MikamiUitOpen 0:7a653530c8ce 23 {
MikamiUitOpen 0:7a653530c8ce 24 public:
MikamiUitOpen 0:7a653530c8ce 25 // コンストラクタ
MikamiUitOpen 0:7a653530c8ce 26 DacDual() : da1_(PA_4), da2_(PA_5)
MikamiUitOpen 0:7a653530c8ce 27 {
MikamiUitOpen 0:7a653530c8ce 28 DAC->CR = DAC_CR_EN1 | DAC_CR_TEN1 | DAC_CR_TSEL1 |
MikamiUitOpen 0:7a653530c8ce 29 DAC_CR_EN2 | DAC_CR_TEN2 | DAC_CR_TSEL2;
MikamiUitOpen 0:7a653530c8ce 30 }
MikamiUitOpen 0:7a653530c8ce 31
MikamiUitOpen 0:7a653530c8ce 32 virtual ~DacDual() {}
MikamiUitOpen 0:7a653530c8ce 33
MikamiUitOpen 0:7a653530c8ce 34 // -1.0f <= data1, data2 <= 1.0f
MikamiUitOpen 0:7a653530c8ce 35 // data1: 左, data2: 右
MikamiUitOpen 0:7a653530c8ce 36 void Write(float data1, float data2)
MikamiUitOpen 0:7a653530c8ce 37 { WriteDac(ToUint16(data1), ToUint16(data2)); }
MikamiUitOpen 0:7a653530c8ce 38
MikamiUitOpen 0:7a653530c8ce 39 // 0 <= data1, data2 <= 4095
MikamiUitOpen 0:7a653530c8ce 40 // data1: 左, data2: 右
MikamiUitOpen 0:7a653530c8ce 41 void Write(uint16_t data1, uint16_t data2)
MikamiUitOpen 0:7a653530c8ce 42 { WriteDac(__USAT(data1, BIT_WIDTH_),
MikamiUitOpen 0:7a653530c8ce 43 __USAT(data2, BIT_WIDTH_)); }
MikamiUitOpen 0:7a653530c8ce 44
MikamiUitOpen 0:7a653530c8ce 45 private:
MikamiUitOpen 0:7a653530c8ce 46 static const uint32_t SWTRIG_ = DAC_SWTRIGR_SWTRIG1
MikamiUitOpen 0:7a653530c8ce 47 | DAC_SWTRIGR_SWTRIG2;
MikamiUitOpen 0:7a653530c8ce 48 static const int BIT_WIDTH_ = 12;
MikamiUitOpen 0:7a653530c8ce 49 AnalogOut da1_, da2_;
MikamiUitOpen 0:7a653530c8ce 50
MikamiUitOpen 0:7a653530c8ce 51 // 両方のチャンネルへ出力する
MikamiUitOpen 0:7a653530c8ce 52 void WriteDac(uint16_t val1, uint16_t val2)
MikamiUitOpen 0:7a653530c8ce 53 {
MikamiUitOpen 0:7a653530c8ce 54 DAC->DHR12RD = __PKHBT(val1, val2, 16);
MikamiUitOpen 0:7a653530c8ce 55 DAC->SWTRIGR = SWTRIG_;
MikamiUitOpen 0:7a653530c8ce 56 }
MikamiUitOpen 0:7a653530c8ce 57
MikamiUitOpen 0:7a653530c8ce 58 // 飽和処理を行い uint16_t 型のデータを戻り値とする
MikamiUitOpen 0:7a653530c8ce 59 uint16_t ToUint16(float val)
MikamiUitOpen 0:7a653530c8ce 60 {
MikamiUitOpen 0:7a653530c8ce 61 return __USAT((val + 1.0f)*2047.0f, BIT_WIDTH_);
MikamiUitOpen 0:7a653530c8ce 62 }
MikamiUitOpen 0:7a653530c8ce 63
MikamiUitOpen 0:7a653530c8ce 64 // コピー･コンストラクタ，代入演算子の禁止のため
MikamiUitOpen 0:7a653530c8ce 65 DacDual(const DacDual&);
MikamiUitOpen 0:7a653530c8ce 66 DacDual& operator=(const DacDual&);
MikamiUitOpen 0:7a653530c8ce 67 };
MikamiUitOpen 0:7a653530c8ce 68 }
MikamiUitOpen 0:7a653530c8ce 69 #endif // F446_DAC_DUAL_HPP