#coding=utf-8
import json

# 常量定义
MCU_CLK = 1000000 # 12MHz，内部时钟12分频
MCU_T =  1000000/MCU_CLK # 单位时间为1us
# 音符映射
note_mapping = {
    1: 'C4', 2: 'D4', 3: 'E4', 4: 'F4', 5: 'G4', 6: 'A4', 7: 'B4'
}

# 根据频率计算计数器初值
def freq_to_num(freq):
	T = 10**6/freq # 单位时间为1us
	time0 = int(2**16 - (T/2) / MCU_T)
	time0H = hex(time0>>8)
	time0L = hex(time0&0xff)
	print("freq = %0.2fHz, T = %dus, time0 = %d, time0H = %s, time0L = %s" % (freq, T, time0, time0H, time0L))
	return time0H, time0L

# 根据音符名称获取频率
def note_to_freq(note_name):
    try:
        # 读取 JSON 文件
        with open('note_data.json', 'r') as file:
            notes = json.load(file)
        
        # 获取特定音符的频率
        frequency = notes[note_name]['frequency']
        return frequency
    
    except KeyError:
        return None
    except Exception as e:
        print(f"An error occurred: {e}")
        return None

# 根据音符名称获取计数器初值
def note_to_num(note_name):
	frequency = note_to_freq(note_name.upper())
	if frequency is not None:
		print(f"{note_name}的频率为{frequency}Hz。")
		freq_to_num(frequency)
	else:
	    print(f"{note_name} 不是有效的音符。")
          

# 转换函数
def map_tones_to_notes(tone_array):
    notes = []
    for tone in tone_array:
        # 将音调映射到相应的音符
        note = note_mapping.get((tone - 1) % 7 + 1 if tone <= 7 else (tone - 1) % 7 + 8)
        notes.append(note)
    return notes

# 原始数据：小星星歌曲
soundtones = [
    1,1,5,5,6,6,5,4,4,3,3,2,2,1,
    5,5,4,4,3,3,2,5,5,4,4,3,3,2,
    1,1,5,5,6,6,5,4,4,3,3,2,2,1
]
if __name__ == '__main__':
	mapped_notes = map_tones_to_notes(soundtones)
	for note in mapped_notes:
		note_to_num(note)