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1.原理: 通过定时器每隔一段时间触发一次DAC转换,然后通过DMA发送正玄波码表值给DAC. 当需要改变频率HZ时,只需要修改定时器频率即可(最高只能达到20KHz) 当需要改变正玄波的正峰峰值/负峰峰值时,只需要修改正玄波码表即可
2.实现 代码如下所示(采用的是定时器2,DAC引脚是PA4) #define HZ(x) (u16)(72000000/sizeof(Sine12bit)*2/x) //计算Hz #define DAC_DHR12R1 0x40007408 //外设DAC通道1的基地址 u16 Sine12bit[256] = { //正弦波描点 2048, 2098, 2148, 2198, 2248, 2298, 2348, 2398, 2447, 2496, 2545, 2594, 2642, 2690, 2737, 2785, 2831, 2877, 2923, 2968, 3013, 3057, 3100, 3143, 3185, 3227, 3267, 3307, 3347, 3385, 3423, 3460, 3496, 3531, 3565, 3598, 3631, 3662, 3692, 3722, 3750, 3778, 3804, 3829, 3854, 3877, 3899, 3920, 3940, 3958, 3976, 3992, 4007, 4021, 4034, 4046, 4056, 4065, 4073, 4080, 4086, 4090, 4093, 4095, 4095, 4095, 4093, 4090, 4086, 4080, 4073, 4065, 4056, 4046, 4034, 4021, 4007, 3992, 3976, 3958, 3940, 3920, 3899, 3877, 3854, 3829, 3804, 3778, 3750, 3722, 3692, 3662, 3631, 3598, 3565, 3531, 3496, 3460, 3423, 3385, 3347, 3307, 3267, 3227, 3185, 3143, 3100, 3057, 3013, 2968, 2923, 2877, 2831, 2785, 2737, 2690, 2642, 2594, 2545, 2496, 2447, 2398, 2348, 2298, 2248, 2198, 2148, 2098, 2047, 1997, 1947, 1897, 1847, 1797, 1747, 1697, 1648, 1599, 1550, 1501, 1453, 1405, 1358, 1310, 1264, 1218, 1172, 1127, 1082, 1038, 995, 952, 910, 868, 828, 788, 748, 710, 672, 635, 599, 564, 530, 497, 464, 433, 403, 373, 345, 317, 291, 266, 241, 218, 196, 175, 155, 137, 119, 103, 88, 74, 61, 49, 39, 30, 22, 15, 9, 5, 2, 0, 0, 0, 2, 5, 9, 15, 22, 30, 39, 49, 61, 74, 88, 103, 119, 137, 155, 175, 196, 218, 241, 266, 291, 317, 345, 373, 403, 433, 464, 497, 530, 564, 599, 635, 672, 710, 748, 788, 828, 868, 910, 952, 995, 1038, 1082, 1127, 1172, 1218, 1264, 1310, 1358, 1405, 1453, 1501, 1550, 1599, 1648, 1697, 1747, 1797, 1847, 1897, 1947, 1997 }; /************************************************************* Function : set_Sine12bit Description : 设置正玄波码表 Input : MAX(正峰峰值) MIN(负峰峰值) return : none *************************************************************/ void Set_Sine12bit(float MAX,float MIN) { int i; float jiaodu=0; float MID=(MAX+MIN)/2.0; //中间峰值 if(MAX>3.3) MAX=3.3; else if(MAX |
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