关于LCD查表法的一个疑问

madswan

在LCD上显示一个6x8的字符，字库格式是这样的
unsigned char code Font_code[][6] = {
{0x00,0x00,0x00,0x00,0x00,0x00},// (0)
{0x00,0x00,0x00,0x4F,0x00,0x00},//!(1)
{0x00,0x00,0x07,0x00,0x07,0x00},//"(2)
{0x00,0x14,0x7F,0x14,0x7F,0x14},//#(3)
{0x00,0x24,0x2A,0x7F,0x2A,0x12},//$(4)
{0x00,0x23,0x13,0x08,0x64,0x62},//%(5)
{0x00,0x36,0x49,0x55,0x22,0x50},//&(6)
{0x00,0x00,0x05,0x03,0x00,0x00},//'(7)
{0x00,0x00,0x1C,0x22,0x41,0x00},//((8)
{0x00,0x00,0x41,0x22,0x1C,0x00},//)(9)
{0x00,0x14,0x08,0x3E,0x08,0x14},//*(10)
{0x00,0x08,0x08,0x3E,0x08,0x08},//+(11)
{0x00,0x00,0x50,0x30,0x00,0x00},//,(12)
{0x00,0x08,0x08,0x08,0x08,0x08},//-(13)
{0x00,0x00,0x60,0x60,0x00,0x00},//.(14)
.
.
.
}
程序中调用（显示6x8的字符）
void print6x8c(unsigned char x, unsigned char y, unsigned char c_dat)
{
        unsigned char i;
        c_dat -= 32;                //查表
        x *= 6;                                //宽6

        LCD_pos_byte(x, y);        //坐标
        for(i = 0; i < 6; i++) LCD_write_dat(Font_code[c_dat][i]);       
}

请问这个c_dat -= 32;为啥要-32？

holts2

因为你的表是从３２开始的，你去看看ＡＳＣＩＩ就知道了

madswan

holts2 发表于 2013-8-21 15:13
因为你的表是从３２开始的，你去看看ＡＳＣＩＩ就知道了

unsigned char code Font_code[][6] = {
{0x00,0x00,0x00,0x00,0x00,0x00},// (0)
{0x00,0x00,0x00,0x4F,0x00,0x00},//!(1)
{0x00,0x00,0x07,0x00,0x07,0x00},//"(2)
{0x00,0x14,0x7F,0x14,0x7F,0x14},//#(3)
{0x00,0x24,0x2A,0x7F,0x2A,0x12},//$(4)
{0x00,0x23,0x13,0x08,0x64,0x62},//%(5)
{0x00,0x36,0x49,0x55,0x22,0x50},//&(6)
{0x00,0x00,0x05,0x03,0x00,0x00},//'(7)
{0x00,0x00,0x1C,0x22,0x41,0x00},//((8)
{0x00,0x00,0x41,0x22,0x1C,0x00},//)(9)
{0x00,0x14,0x08,0x3E,0x08,0x14},//*(10)
{0x00,0x08,0x08,0x3E,0x08,0x08},//+(11)
{0x00,0x00,0x50,0x30,0x00,0x00},//,(12)
{0x00,0x08,0x08,0x08,0x08,0x08},//-(13)
{0x00,0x00,0x60,0x60,0x00,0x00},//.(14)
{0x00,0x20,0x10,0x08,0x04,0x02},///(15)
{0x00,0x3E,0x51,0x49,0x45,0x3E},//0(16)
{0x00,0x00,0x42,0x7F,0x40,0x00},//1(17)
{0x00,0x42,0x61,0x51,0x49,0x46},//2(18)
{0x00,0x21,0x41,0x45,0x4B,0x31},//3(19)
{0x00,0x18,0x14,0x12,0x7F,0x10},//4(20)
{0x00,0x27,0x45,0x45,0x45,0x39},//5(21)
{0x00,0x3C,0x4A,0x49,0x49,0x30},//6(22)
{0x00,0x01,0x71,0x09,0x05,0x03},//7(23)
{0x00,0x36,0x49,0x49,0x49,0x36},//8(24)
{0x00,0x06,0x49,0x49,0x29,0x1E},//9(25)
{0x00,0x00,0x36,0x36,0x00,0x00},//:(26)
{0x00,0x00,0x56,0x36,0x00,0x00},//;(27)
{0x00,0x08,0x14,0x22,0x41,0x00},//<(28)
{0x00,0x14,0x14,0x14,0x14,0x14},//=(29)
{0x00,0x00,0x41,0x22,0x14,0x08},//>(30)
{0x00,0x02,0x01,0x51,0x09,0x06},//?(31)
{0x00,0x32,0x49,0x79,0x41,0x3E},//@(32)
{0x00,0x7E,0x11,0x11,0x11,0x7E},//A(33)
{0x00,0x7F,0x49,0x49,0x49,0x3E},//B(34)
{0x00,0x3E,0x41,0x41,0x41,0x22},//C(35)
{0x00,0x7F,0x41,0x41,0x22,0x1C},//D(36)
{0x00,0x7F,0x49,0x49,0x49,0x41},//E(37)
{0x00,0x7F,0x09,0x09,0x09,0x01},//F(38)
{0x00,0x3E,0x41,0x49,0x49,0x7A},//G(39)
{0x00,0x7F,0x08,0x08,0x08,0x7F},//H(40)
{0x00,0x00,0x41,0x7F,0x41,0x00},//I(41)
{0x00,0x20,0x40,0x41,0x3F,0x01},//J(42)
{0x00,0x7F,0x08,0x14,0x22,0x41},//K(43)
{0x00,0x7F,0x40,0x40,0x40,0x40},//L(44)
{0x00,0x7F,0x02,0x04,0x02,0x7F},//M(45)
{0x00,0x7F,0x04,0x08,0x10,0x7F},//N(46)
{0x00,0x3E,0x41,0x41,0x41,0x3E},//O(47)
{0x00,0x7F,0x09,0x09,0x09,0x06},//P(48)
{0x00,0x3E,0x41,0x51,0x21,0x5E},//Q(49)
{0x00,0x7F,0x09,0x19,0x29,0x46},//R(50)
{0x00,0x46,0x49,0x49,0x49,0x31},//S(51)
{0x00,0x01,0x01,0x7F,0x01,0x01},//T(52)
{0x00,0x3F,0x40,0x40,0x40,0x3F},//U(53)
{0x00,0x1F,0x20,0x40,0x20,0x1F},//V(54)
{0x00,0x3F,0x40,0x38,0x40,0x3F},//W(55)
{0x00,0x63,0x14,0x08,0x14,0x63},//X(56)
{0x00,0x03,0x04,0x78,0x04,0x03},//Y(57)
{0x00,0x61,0x51,0x49,0x45,0x43},//Z(58)
{0x00,0x00,0x7F,0x41,0x41,0x00},//[(59)
{0x00,0x15,0x16,0x7C,0x16,0x15},//\(60)
{0x00,0x00,0x41,0x41,0x7F,0x00},//](61)
{0x00,0x04,0x02,0x01,0x02,0x04},//^(62)
{0x00,0x40,0x40,0x40,0x40,0x40},//_(63)
{0x00,0x00,0x01,0x02,0x04,0x00},//`(64)
{0x00,0x20,0x54,0x54,0x54,0x78},//a(65)
{0x00,0x7F,0x48,0x44,0x44,0x38},//b(66)
{0x00,0x38,0x44,0x44,0x44,0x20},//c(67)
{0x00,0x38,0x44,0x44,0x48,0x7F},//d(68)
{0x00,0x38,0x54,0x54,0x54,0x18},//e(69)
{0x00,0x08,0x7E,0x09,0x01,0x02},//f(70)
{0x00,0x0C,0x52,0x52,0x52,0x3E},//g(71)
{0x00,0x7F,0x08,0x04,0x04,0x78},//h(72)
{0x00,0x00,0x44,0x7D,0x40,0x00},//i(73)
{0x00,0x20,0x40,0x44,0x3D,0x00},//j(74)
{0x00,0x7F,0x10,0x28,0x44,0x00},//k(75)
{0x00,0x00,0x41,0x7F,0x40,0x00},//l(76)
{0x00,0x7E,0x02,0x0C,0x02,0x7C},//m(77)
{0x00,0x7E,0x04,0x02,0x02,0x7C},//n(78)
{0x00,0x38,0x44,0x44,0x44,0x38},//o(79)
{0x00,0x7C,0x14,0x14,0x14,0x08},//p(80)
{0x00,0x08,0x14,0x14,0x18,0x7C},//q(81)
{0x00,0x7C,0x08,0x04,0x04,0x08},//r(82)
{0x00,0x48,0x54,0x54,0x54,0x20},//s(83)
{0x00,0x04,0x3F,0x44,0x40,0x20},//t(84)
{0x00,0x3C,0x40,0x40,0x20,0x7C},//u(85)
{0x00,0x1C,0x20,0x40,0x20,0x1C},//v(86)
{0x00,0x3C,0x40,0x30,0x40,0x3C},//w(87)
{0x00,0x44,0x28,0x10,0x28,0x44},//x(88)
{0x00,0x0C,0x50,0x50,0x50,0x3C},//y(89)
{0x00,0x44,0x64,0x54,0x4C,0x44},//z(90)
{0x00,0x00,0x08,0x36,0x41,0x00},//{(91)
{0x00,0x00,0x00,0x7F,0x00,0x00},//|(92)
{0x00,0x00,0x41,0x36,0x08,0x00},//}(93)
{0x00,0x07,0x05,0x07,0x00,0x00},//°(94)
}
这个就是我完整的表，第32个不是是@吗？

madswan

搞定了。。

xou822

ascii码的字符和实际字库的顺序相差32

所以需要减去32   你看ascii码表数字0的位置和实际字库里面0的位置就知道了  

junyees

如果你愿意,你可以把字库的编码和ASCII对应上,这样就不用+32了.