DS18B20温度传感器VHDL数码管显示DE2-115开发板_电路方案

名称：DS18B20 温度传感器DE2-115开发板数码管显示VHDL（代码在文末下载）
软件：Quartus II
语言：VHDL
代码功能：
1、正常温度范围显示。
2、按一下按键实现测温，数码管显示温度。
3、温度正常时绿色led灯亮，异常时红色led灯亮。
FPGA代码Verilog/VHDL代码资源下载：www.hdlcode.com
本代码已在DE2-115开发板验证，开发板如下，其他开发板可以修改管脚适配：
部分代码展示:
LIBRARY?ieee;
???USE?ieee.std_logic_1164.all;
???USE?ieee.std_logic_unsigned.all;
???USE?ieee.std_logic_arith.all;
--BS18B20驱动模块
ENTITY?ds18b20_drive?IS
???PORT?(
??????clk??????????:?IN?STD_LOGIC;?--?50MHz时钟
??????rst_n????????:?IN?STD_LOGIC;--?异步复位
??????one_wire?????:?INOUT?STD_LOGIC;--?One-Wire总线
??????temperature??:?OUT?STD_LOGIC_VECTOR(15?DOWNTO?0)?--?输出温度值
???);
END?ds18b20_drive;

ARCHITECTURE?behavioral?OF?ds18b20_drive?IS
????constant??S00??????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00000";
????constant??S0???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00001";
????constant??S1???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00010";
????constant??S2???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00011";
????constant??S3???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00100";
????constant??S4???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00101";
????constant??S5???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00110";
????constant??S6???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="00111";
????constant??S7???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01000";
????constant??WRITE0???????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01001";
????constant??WRITE1???????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01010";
????constant??WRITE00??????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01011";
????constant??WRITE01??????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01100";
????constant??READ0????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01101";
????constant??READ1????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01110";
????constant??READ2????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="01111";
????constant??READ3????????:?STD_LOGIC_VECTOR(4?DOWNTO?0):="10000";
???SIGNAL?cnt?????????????:?STD_LOGIC_VECTOR(5?DOWNTO?0);
???SIGNAL?clk_1us?????????:?STD_LOGIC;
???SIGNAL?cnt_1us?????????:?STD_LOGIC_VECTOR(19?DOWNTO?0);
???SIGNAL?cnt_1us_clear???:?STD_LOGIC;
???
???SIGNAL?state???????????:?STD_LOGIC_VECTOR(4?DOWNTO?0);
???
???SIGNAL?one_wire_buf????:?STD_LOGIC;--?One-Wire总线?缓存寄存器
???
???SIGNAL?temperature_buf?:?STD_LOGIC_VECTOR(15?DOWNTO?0);--?采集到的温度值缓存器
???SIGNAL?step????????????:?STD_LOGIC_VECTOR(5?DOWNTO?0);?--?子状态寄存器?0~50
???SIGNAL?bit_valid???????:?STD_LOGIC_VECTOR(3?DOWNTO?0);?--?有效位??
???
???SIGNAL?t_buf???????????:?STD_LOGIC_VECTOR(15?DOWNTO?0);
BEGIN
--++++++++++++++++++++++++++++++++++++++
--?分频器50MHz->1MHz?开始
--++++++++++++++++++++++++++++++++++++++
???PROCESS?(clk,?rst_n)
???BEGIN
??????IF?((NOT(rst_n))?=?'1')?THEN
?????????cnt?<=?"000000";
??????ELSIF?(clk'EVENT?AND?clk?=?'1')?THEN
?????????IF?(cnt?=?"110001")?THEN
????????????cnt?<=?"000000";
?????????ELSE
????????????cnt?<=?cnt?+?"000001";--?计数子
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???PROCESS?(clk,?rst_n)
???BEGIN
??????IF?((NOT(rst_n))?=?'1')?THEN
?????????clk_1us?<=?'0';?--?1MHz?时钟
??????ELSIF?(clk'EVENT?AND?clk?=?'1')?THEN
?????????IF?(cnt?<=?"011000")?THEN?--?24?=?50/2?-?1
????????????clk_1us?<=?'0';
?????????ELSE
????????????clk_1us?<=?'1';
?????????END?IF;
??????END?IF;
???END?PROCESS;
----------------------------------------
--?分频器50MHz->1MHz?结束
----------------------------------------
--++++++++++++++++++++++++++++++++++++++
--?延时模块?开始
--++++++++++++++++++++++++++++++++++++++
???PROCESS?(clk_1us)
???BEGIN
??????IF?(clk_1us'EVENT?AND?clk_1us?=?'1')?THEN
?????????IF?(cnt_1us_clear?=?'1')?THEN?--?请1us延时计数子
????????????cnt_1us?<=?"00000000000000000000";
?????????ELSE
????????????cnt_1us?<=?cnt_1us?+?"00000000000000000001";--?1us延时计数子
?????????END?IF;
??????END?IF;
???END?PROCESS;
----------------------------------------
--?延时模块?结束
----------------------------------------
--++++++++++++++++++++++++++++++++++++++
--?DS18B20状态机?开始
--++++++++++++++++++++++++++++++++++++++
--++++++++++++++++++++++++++++++++++++++??
???PROCESS?(clk_1us,?rst_n)
???BEGIN
??????IF?((NOT(rst_n))?=?'1')?THEN
?????????one_wire_buf?<=?'Z';
?????????step?<=?"000000";
?????????state?<=?S00;?--?状态寄存器
??????ELSIF?(clk_1us'EVENT?AND?clk_1us?=?'1')?THEN
?????????CASE?state?IS
????????????WHEN?S00?=>
???????????????temperature_buf?<=?"0000000000011111";
???????????????state?<=?S0;
????????????WHEN?S0?=>--?初始化
???????????????cnt_1us_clear?<=?'1';
???????????????one_wire_buf?<=?'0';
???????????????state?<=?S1;
????????????WHEN?S1?=>?--?延时500us
???????????????cnt_1us_clear?<=?'0';
???????????????IF?(cnt_1us?=?"00000000000111110100")?THEN
??????????????????cnt_1us_clear?<=?'1';
??????????????????one_wire_buf?<=?'Z';--?释放总线
??????????????????state?<=?S2;
???????????????END?IF;
????????????WHEN?S2?=>
???????????????cnt_1us_clear?<=?'0';
???????????????IF?(cnt_1us?=?"00000000000001100100")?THEN?--?等待100us
??????????????????cnt_1us_clear?<=?'1';
??????????????????state?<=?S3;
???????????????END?IF;
????????????WHEN?S3?=>
???????????????IF?((NOT(one_wire))?=?'1')?THEN?--?若18b20拉低总线,初始化成功
??????????????????state?<=?S4;
???????????????ELSIF?(one_wire?=?'1')?THEN???--?否则,初始化不成功,返回S0
??????????????????state?<=?S0;
???????????????END?IF;
????????????WHEN?S4?=>
???????????????cnt_1us_clear?<=?'0';
???????????????IF?(cnt_1us?=?"00000000000110010000")?THEN--?再延时400us
??????????????????cnt_1us_clear?<=?'1';
??????????????????state?<=?S5;
???????????????END?IF;
????????????WHEN?S5?=>???--?写数据
???????????????IF?(step?=?"000000")?THEN?--?0xCC
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"000001")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"000010")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"000011")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"000100")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"000101")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"000110")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"000111")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"001000")?THEN--?0x44
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"001001")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"001010")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"001011")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"001100")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"001101")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"001110")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"001111")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"010000")?THEN?--?第一次写完,750ms后,跳回S0
??????????????????one_wire_buf?<=?'Z';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?S6;
???????????????ELSIF?(step?=?"010001")?THEN?--?再次置数0xCC和0xBE
??????????????????step?<=?step?+?"000001";--?0xCC
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"010010")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"010011")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"010100")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"010101")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"010110")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"010111")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011000")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011001")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"011010")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011011")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011100")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011101")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011110")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"011111")?THEN
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE0;
???????????????ELSIF?(step?=?"100000")?THEN
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?WRITE01;
???????????????ELSIF?(step?=?"100001")?THEN--?第二次写完,跳到S7,直接开始读数据
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?S7;
???????????????END?IF;
????????????WHEN?S6?=>
???????????????cnt_1us_clear?<=?'0';
???????????????IF?(cnt_1us?=?"10110111000110110000"?OR?one_wire?=?'1')?THEN?--?延时750ms!!!!
??????????????????cnt_1us_clear?<=?'1';
??????????????????state?<=?S0;?--?跳回S0,再次初始化
???????????????END?IF;
????????????WHEN?S7?=>?--?读数据
???????????????IF?(step?=?"100010")?THEN
??????????????????bit_valid?<=?"0000";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"100011")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"100100")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"100101")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"100110")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"100111")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101000")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101001")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101010")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101011")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101100")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101101")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101110")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"101111")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"110000")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"110001")?THEN
??????????????????bit_valid?<=?bit_valid?+?"0001";
??????????????????one_wire_buf?<=?'0';
??????????????????step?<=?step?+?"000001";
??????????????????state?<=?READ0;
???????????????ELSIF?(step?=?"110010")?THEN
??????????????????step?<=?"000000";
??????????????????state?<=?S0;
???????????????END?IF;
???
--++++++++++++++++++++++++++++++++
??????--?写状态机
??????--++++++++++++++++++++++++++++++++
????????????WHEN?WRITE0?=>--?输出0?
???????????????cnt_1us_clear?<=?'0';
???????????????one_wire_buf?<=?'0';
???????????????IF?(cnt_1us?=?"00000000000001010000")?THEN?--?延时80us
??????????????????cnt_1us_clear?<=?'1';
??????????????????one_wire_buf?<=?'Z';--?释放总线，自动拉高???
??????????????????state?<=?WRITE00;
???????????????END?IF;
????????????WHEN?WRITE00?=>?--?空状态
???????????????state?<=?S5;
????????????WHEN?WRITE01?=>--?空状态
???????????????state?<=?WRITE1;
????????????WHEN?WRITE1?=>
???????????????cnt_1us_clear?<=?'0';
???????????????one_wire_buf?<=?'Z';--?输出1???释放总线，自动拉高
???????????????IF?(cnt_1us?=?"00000000000001010000")?THEN
??????????????????cnt_1us_clear?<=?'1';--?延时80us
??????????????????state?<=?S5;
???????????????END?IF;
???
??????----------------------------------
??????--?写状态机
??????----------------------------------
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