做设计遇到一个问题，，请大家帮忙看看，，如图的电路安装经典的DAC0832双极性输出搭建的，按道理可以使0-255的数字量，但是我现在用这个数组输出得到的正弦波只有正半周期，不知怎么回事呀
uchar code sinewave2[]={
128, 130, 132, 135, 137, 139, 141, 144, 146, 148,150, 152, 155, //正弦函数点数组
157, 159, 161, 163, 165, 168, 170,172, 174,176, 178, 180, 182,
184, 186, 188, 190,192, 194, 196, 198, 200, 201, 203, 205, 207, 209,
210, 212, 214, 215, 217, 219, 220, 222, 223, 225, 226,
227, 229, 230, 232, 233, 234, 235, 237, 238,
239, 240, 241, 242, 243, 244, 245, 246, 247, 247 ,
248, 249, 250, 250, 251, 252, 252, 253, 253, 254,
254, 254, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 254,
254, 254, 253, 253, 252, 252, 251, 250, 250, 249,
248, 247, 247, 246, 245, 244, 243, 242, 241, 240,
239, 238, 237, 235, 234, 233, 232, 230, 229, 227,
226, 225, 223, 222, 220, 219, 217, 215, 214, 212 ,
210, 209, 207, 205, 203, 201, 200, 198, 196, 194,
192, 190, 188, 186, 184, 182, 180, 178, 176, 174,
172, 170, 168, 165, 163, 161, 159, 157, 155, 152 ,
150, 148, 146, 144, 141, 139, 137, 135, 132, 130 ,
128, 126, 124, 121, 119, 117, 115, 112, 110, 108,
106, 104, 101, 99, 97, 95, 93, 91, 88, 86,
84, 82, 80, 78, 76, 74, 72, 70, 68, 66 ,
64, 62, 60, 58, 56, 55, 53, 51, 49, 47 ,
46, 44, 42, 41, 39, 37, 36, 34, 33, 31,
30, 29, 27, 26, 24, 23, 22, 21, 19, 18,
17, 16, 15, 14, 13, 12, 11, 10, 9, 9,
8, 7, 6, 6, 5, 4, 4, 3, 3, 2,
2, 2, 1, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1, 1, 1, 2,
2, 2, 3, 3, 4, 4, 5, 6, 6, 7,
8, 9, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 21, 22, 23, 24, 26, 27, 29,
30, 31, 33, 34, 36, 37, 39, 41, 42, 44,
46, 47, 49, 51, 53, 55, 56, 58, 60, 62,
64, 66, 68, 70, 72, 74, 76, 78, 80, 82,
84, 86, 88, 91, 93, 95, 97, 99, 101, 104,
106, 108, 110, 112, 115, 117, 119, 121, 124, 126,
128
};
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