不韋 呂 / Mbed 2 deprecated SDR_FM_Rx_CIC

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@1:2b596eab04de, 2021-02-04 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Feb 04 09:45:09 2021 +0000
Revision:
1:2b596eab04de
Parent:
0:4037028ba61a 
2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:4037028ba61a 1 //--------------------------------------------------------
MikamiUitOpen 0:4037028ba61a 2 // STM32F446 内蔵の DAC 用のクラス（ヘッダ）
MikamiUitOpen 0:4037028ba61a 3 // 出力端子： A2 (PA_4) に固定
MikamiUitOpen 0:4037028ba61a 4 //
MikamiUitOpen 0:4037028ba61a 5 // 2020/07/23, Copyright (c) 2020 MIKAMI, Naoki
MikamiUitOpen 0:4037028ba61a 6 //--------------------------------------------------------
MikamiUitOpen 0:4037028ba61a 7
MikamiUitOpen 0:4037028ba61a 8 #include "mbed.h"
MikamiUitOpen 0:4037028ba61a 9
MikamiUitOpen 0:4037028ba61a 10 #ifndef DAC_F446_SINGLE_HPP
MikamiUitOpen 0:4037028ba61a 11 #define DAC_F446_SINGLE_HPP
MikamiUitOpen 0:4037028ba61a 12
MikamiUitOpen 0:4037028ba61a 13 namespace Mikami
MikamiUitOpen 0:4037028ba61a 14 {
MikamiUitOpen 0:4037028ba61a 15 class DacF446
MikamiUitOpen 0:4037028ba61a 16 {
MikamiUitOpen 0:4037028ba61a 17 public:
MikamiUitOpen 0:4037028ba61a 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 0:4037028ba61a 19 DacF446();
MikamiUitOpen 0:4037028ba61a 20
MikamiUitOpen 0:4037028ba61a 21 virtual ~DacF446() {}
MikamiUitOpen 0:4037028ba61a 22
MikamiUitOpen 0:4037028ba61a 23 // -1.0f <= data <= 1.0f
MikamiUitOpen 0:4037028ba61a 24 void Write(float data) { WriteDac1(ToUint16(data)); }
MikamiUitOpen 0:4037028ba61a 25
MikamiUitOpen 0:4037028ba61a 26 private:
MikamiUitOpen 0:4037028ba61a 27 static const int BIT_WIDTH_ = 12;
MikamiUitOpen 0:4037028ba61a 28 DAC_TypeDef* const DAC_; // DA 変換器に対応する構造体のポインタ
MikamiUitOpen 0:4037028ba61a 29
MikamiUitOpen 0:4037028ba61a 30 // DAC の CH1 へ右詰めで出力する
MikamiUitOpen 0:4037028ba61a 31 void WriteDac1(uint16_t val) { DAC_->DHR12R1 = val; }
MikamiUitOpen 0:4037028ba61a 32
MikamiUitOpen 0:4037028ba61a 33 // 飽和処理を行い uint16_t 型のデータを戻り値とする
MikamiUitOpen 0:4037028ba61a 34 uint16_t ToUint16(float val)
MikamiUitOpen 0:4037028ba61a 35 { return __USAT((val + 1.0f)*2048.0f, BIT_WIDTH_); }
MikamiUitOpen 0:4037028ba61a 36
MikamiUitOpen 0:4037028ba61a 37 // コピー･コンストラクタ，代入演算子の禁止のため
MikamiUitOpen 0:4037028ba61a 38 DacF446(const DacF446&);
MikamiUitOpen 0:4037028ba61a 39 DacF446& operator=(const DacF446&);
MikamiUitOpen 0:4037028ba61a 40 };
MikamiUitOpen 0:4037028ba61a 41 }
MikamiUitOpen 0:4037028ba61a 42 #endif // DAC_F446_SINGLE_HPP