回答編集履歴
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answer
CHANGED
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@@ -17,4 +17,45 @@
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17
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- [https://github.com/arduino/Arduino](https://github.com/arduino/Arduino)
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- [https://github.com/ARMmbed/mbed-os](https://github.com/ARMmbed/mbed-os)
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- [https://github.com/Seeed-Studio/Grove_Serial_MP3_Player_V2.0](https://github.com/Seeed-Studio/Grove_Serial_MP3_Player_V2.0)
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- [http://wiki.seeed.cc/Grove-MP3_v2.0/](http://wiki.seeed.cc/Grove-MP3_v2.0/)
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20
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- [http://wiki.seeed.cc/Grove-MP3_v2.0/](http://wiki.seeed.cc/Grove-MP3_v2.0/)
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## 追記
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23
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うーん、本当に書き換えはほぼCの範囲なんだけどなぁ・・・
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```cpp
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void SpecifyfolderPlay(uint8_t folder, uint8_t index)
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{
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mp3.write(0x7E);
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mp3.write(0xFF);
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mp3.write(0x06);
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mp3.write(0x0F);
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mp3.write(uint8_t(0x00));
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mp3.write(uint8_t(folder));
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mp3.write(uint8_t(index));
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mp3.write(0xEF);
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delay(10);
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// return true;
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}
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```
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例えば[こんな関数](https://github.com/Seeed-Studio/Grove_Serial_MP3_Player_V2.0/blob/00dfa96d7444f12bd15c7feb39325bdc5b04c392/MP3Player_KT403A.cpp#L89)がありますが、
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43
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44
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```cpp
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45
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#include "mbed.h"
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46
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#include <cstdint>
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template <class T, size_t N>
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constexpr size_t size(const T (&)[N]) noexcept { return N; }
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using uint8_t = std::uint8_t;
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void SpecifyfolderPlay(uint8_t folder, uint8_t index)
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{
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const uint8_t out[] = { 0x7E, 0xFF, 0x06, 0x00, folder, index, 0xEF };
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mp3.write(reinterpret_cast<const char*>(out), size(out));
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wait_ms(10);
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}
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```
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こんな感じになるんじゃないですかね～、あくまでイメージですが。
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