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

SDR_Library/F446_DAC.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（ヘッダ）
MikamiUitOpen 0:7a653530c8ce 3 // 出力端子： A2 (PA_4) に固定
MikamiUitOpen 0:7a653530c8ce 4 //
MikamiUitOpen 0:7a653530c8ce 5 // 2020/07/23, Copyright (c) 2020 MIKAMI, Naoki
MikamiUitOpen 0:7a653530c8ce 6 //--------------------------------------------------------
MikamiUitOpen 0:7a653530c8ce 7
MikamiUitOpen 0:7a653530c8ce 8 #include "mbed.h"
MikamiUitOpen 0:7a653530c8ce 9
MikamiUitOpen 0:7a653530c8ce 10 #ifndef DAC_F446_SINGLE_HPP
MikamiUitOpen 0:7a653530c8ce 11 #define DAC_F446_SINGLE_HPP
MikamiUitOpen 0:7a653530c8ce 12
MikamiUitOpen 0:7a653530c8ce 13 namespace Mikami
MikamiUitOpen 0:7a653530c8ce 14 {
MikamiUitOpen 0:7a653530c8ce 15 class DacF446
MikamiUitOpen 0:7a653530c8ce 16 {
MikamiUitOpen 0:7a653530c8ce 17 public:
MikamiUitOpen 0:7a653530c8ce 18 // コンストラクタ， A2 に接続される CH1 のみを有効にする
MikamiUitOpen 0:7a653530c8ce 19 DacF446();
MikamiUitOpen 0:7a653530c8ce 20
MikamiUitOpen 0:7a653530c8ce 21 virtual ~DacF446() {}
MikamiUitOpen 0:7a653530c8ce 22
MikamiUitOpen 0:7a653530c8ce 23 // -1.0f <= data <= 1.0f
MikamiUitOpen 0:7a653530c8ce 24 void Write(float data) { WriteDac1(ToUint16(data)); }
MikamiUitOpen 0:7a653530c8ce 25
MikamiUitOpen 0:7a653530c8ce 26 private:
MikamiUitOpen 0:7a653530c8ce 27 static const int BIT_WIDTH_ = 12;
MikamiUitOpen 0:7a653530c8ce 28 DAC_TypeDef* const DAC_; // DA 変換器に対応する構造体のポインタ
MikamiUitOpen 0:7a653530c8ce 29
MikamiUitOpen 0:7a653530c8ce 30 // DAC の CH1 へ右詰めで出力する
MikamiUitOpen 0:7a653530c8ce 31 void WriteDac1(uint16_t val) { DAC_->DHR12R1 = val; }
MikamiUitOpen 0:7a653530c8ce 32
MikamiUitOpen 0:7a653530c8ce 33 // 飽和処理を行い uint16_t 型のデータを戻り値とする
MikamiUitOpen 0:7a653530c8ce 34 uint16_t ToUint16(float val)
MikamiUitOpen 0:7a653530c8ce 35 { return __USAT((val + 1.0f)*2048.0f, BIT_WIDTH_); }
MikamiUitOpen 0:7a653530c8ce 36
MikamiUitOpen 0:7a653530c8ce 37 // コピー･コンストラクタ，代入演算子の禁止のため
MikamiUitOpen 0:7a653530c8ce 38 DacF446(const DacF446&);
MikamiUitOpen 0:7a653530c8ce 39 DacF446& operator=(const DacF446&);
MikamiUitOpen 0:7a653530c8ce 40 };
MikamiUitOpen 0:7a653530c8ce 41 }
MikamiUitOpen 0:7a653530c8ce 42 #endif // DAC_F446_SINGLE_HPP