如何設(shè)計(jì)基于CPLD的溫度計(jì)(原理和代碼)?
buf1[3:0] = (buf0[3:0]> =10)?(buf0[3:0]-10 + 6):(buf0[3:0]+6);
buf1[7:4] = (buf0[3:0]> =10)?(buf0[7:4]+1):buf0[7:4];
buf2[3:0] = (buf1[3:0]> =10)?(buf1[3:0]-10):(buf1[3:0]);
buf2[7:4] = (buf1[3:0]> =10)?(buf1[7:4]+1):buf1[7:4];
data_out = buf2;
end
default:
begin
data_out = data_in;
end
endcase
assign temperature = data_out[7:0]
# 6. 數(shù)碼管顯示
本設(shè)計(jì)采用4位共陽極數(shù)碼管作為溫度顯示模塊,驅(qū)動(dòng)代碼如下:
//-----------------數(shù)碼管顯示-------------------
assign sm_sel ={2’b11,sm_sel_r};
assign sm_dat = sm_dat_r;
//XXXX = 8‘b{a,b,c,d,e,f,g,dp}
parameter ZERO = 8’b0000_0011,//8‘b1100_0000,
ONE = 8’b1001_1111,//8‘b1111_1001,
TWO = 8’b0010_0101,//8‘b1010_0100,
THREE = 8’b0000_1101,//8‘b1011_0000,
FOUR = 8’b1001_1001,//8‘b1001_1001,
FIVE = 8’b0100_1001,//8‘b1001_0010,
SIX = 8’b0100_0001,//8‘b1000_0010,
SEVEN = 8’b0001_1111,//8‘b1111_1000,
EIGHT = 8’b0000_0001,//8‘b1000_0000,
NINE = 8’b0000_1001;//8‘b1001_0000;
reg [7:0] sm_dat_r;
reg [7:0] sm_dat_r1;
reg [7:0] sm_dat_r2;
always @ (*)
case( temperature[3:0] )
4’d0 : sm_dat_r1 = ZERO;
4‘d1 : sm_dat_r1 = ONE;
4’d2 : sm_dat_r1 = TWO;
4‘d3 : sm_dat_r1 = THREE;
4’d4 : sm_dat_r1 = FOUR;
4‘d5 : sm_dat_r1 = FIVE;
4’d6 : sm_dat_r1 = SIX;
4‘d7 : sm_dat_r1 = SEVEN;
4’d8 : sm_dat_r1 = EIGHT;
4‘d9 : sm_dat_r1= NINE;
default:sm_dat_r1 = 8’hFF;
endcase
always @ (*)
case( temperature[6:4] )
4‘d0 : sm_dat_r2 = ZERO;
4’d1 : sm_dat_r2 = ONE;
4‘d2 : sm_dat_r2 = TWO;
4’d3 : sm_dat_r2 = THREE;
4‘d4 : sm_dat_r2 = FOUR;
4’d5 : sm_dat_r2 = FIVE;
4‘d6 : sm_dat_r2 = SIX;
4’d7 : sm_dat_r2 = SEVEN;
4‘d8 : sm_dat_r2 = EIGHT;
4’d9 : sm_dat_r2 = NINE;
endcase
reg [1:0] sm_sel_r;
reg [0:0] sm_cnt;
always @(posedge clk_ref)
sm_cnt = sm_cnt + 1‘b1;
always @(sm_cnt)
case(sm_cnt)
’d0:
begin
sm_sel_r = 2‘b01;
sm_dat_r = sm_dat_r1;
end
’d1:
begin
sm_sel_r = 2‘b10;
sm_dat_r = sm_dat_r2;
end
default:
begin
sm_sel_r= 2’b11;
sm_dat_r = ZERO;
end
endcase
```
7. 最終結(jié)果
下圖為實(shí)測(cè)的溫度結(jié)果,比實(shí)際溫度高出2-3度。由于芯片出廠的誤差(沒有對(duì)0校準(zhǔn)),加上板卡本身的散熱,使得溫度偏高2~3度。但不影響我們學(xué)習(xí)使用。
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