1

2

3 --本程序用來測(cè)試STM32對(duì)CPLD的讀寫操作

4

5 --測(cè)試功能如下：

6

7 --向0x05地址寫入0x01,LED燈停止閃爍，寫入其他數(shù)據(jù)閃爍繼續(xù)

8

9 --0x03,0x04寄存器為定值，可以通過STM32讀取然后使用串口輸出看看是否一致

10

11

12

13 --文件名：AD.vhd

14

15 library ieee;

16

17 use ieee.std_logic_1164.all;

18

19 use ieee.std_logic_unsigned.all;

20

21

22

23 entity AD is

24

25 port(

26

27 -- 系統(tǒng)信號(hào)線

28

29 CLK: in std_logic;

30

31 LED: out std_logic;

32

33 -- ARM相連的信號(hào)線

34

35 Adr_L: in std_logic_vector(7 downto 0); --A7...A0,只使用了低八位地址線

36

37 D: inout std_logic_vector(7 downto 0); --只使用了低八位數(shù)據(jù)線

38

39 FSMC_NE4: in std_logic;

40

41 FSMC_NOE: in std_logic;

42

43 FSMC_NWE: in std_logic

44

45 );

46

47 end AD;

48

49

50

51 architecture art of AD is

52

53 --設(shè)置存儲(chǔ)數(shù)據(jù)的寄存器

54

55 signal AD0_H_data,AD0_L_data,AD1_H_data,AD1_L_data,LED_ctrl: std_logic_vector(7 downto 0);

56

57 --數(shù)據(jù)緩沖寄存器

58

59 signal data_buf: std_logic_vector(7 downto 0);

60

61 --數(shù)據(jù)輸出控制

62

63 signal data_outctl: std_logic;

64

65 signal datacnt:integer range 0 to 4000000;--分頻計(jì)數(shù)

66

67 --LED閃爍使能

68

69 signal LED_flag: std_logic;

70

71

72

73

74

75 --統(tǒng)一編址，地址線數(shù)據(jù)線為八位，每個(gè)地址數(shù)據(jù)寬度8位

76

77 --"00000001" AD0_H_data0x01

78

79 --"00000010" AD0_L_data0x02

80

81 --"00000011" AD1_H_data0x03

82

83 --"00000100" AD1_L_data0x04

84

85 --"00000101" LED_ctrl0x05

86

87

88

89 begin

90

91

92

93 AD1_H_data <="10100001";

94

95 AD1_L_data <="00010001";

96

97 --LED 閃爍，用作CPLD運(yùn)行指示

98

99

100

101 process(LED_ctrl) is

102

103 begin

104

105 if(LED_ctrl="00000001") then

106

107 LED_flag <= '0';

108

109 else

110

111 LED_flag <= '1';

112

113 end if;

114

115 end process;

116

117

118

119 process(CLK)is

120

121 begin

122

123

124

125

126

127 if(CLK'event and CLK='1') then

128

129 if(LED_flag='1') then

130

131 datacnt<=datacnt+1;

132

133 if (datacnt>2000000) then

134

135 LED <= '1';

136

137 end if;

138

139 if (datacnt>=4000000) then

140

141 LED <='0';

142

143 datacnt <=0;

144

145 end if;

146

147 end if;

148

149 end if;

150

151 end process;

152

153

154

155 --當(dāng)讀取CPLD數(shù)據(jù)時(shí)用來判斷何時(shí)向總線上輸出數(shù)據(jù)

156

157 data_outctl <= (not FSMC_NE4) and (not FSMC_NOE) and (FSMC_NWE);

158

159 D <= data_buf when (data_outctl='1') else "ZZZZZZZZ";--向數(shù)據(jù)線輸出數(shù)據(jù)，否則保持為高阻態(tài)

160

161

162

163 -- 寫操作,模式1,時(shí)序圖在數(shù)據(jù)手冊(cè)P331

164

165 process(FSMC_NE4,FSMC_NWE,Adr_L,FSMC_NOE) is --,FSMC_NBL,D,RESET

166

167 begin

168

169 if(FSMC_NWE'event and FSMC_NWE='1') then

170

171 if((FSMC_NOE and (not FSMC_NE4))='1') then

172

173 case (Adr_L) is

174

175 when "00000001" =>

176

177 AD0_H_data<= D; --0x01

178

179 when "00000010" =>

180

181 AD0_L_data<= D; --0x02

182

183 when "00000101" =>

184

185 LED_ctrl<= D;--0x05

186

187 when others =>

188

189 AD0_H_data<= AD0_H_data;

190

191 AD0_L_data<= AD0_L_data;

192

193 end case;

194

195 end if;

196

197 end if;

198

199 end process;

200

201

202

203 --讀操作,模式1,P331

204

205 process(FSMC_NE4,FSMC_NWE,Adr_L,FSMC_NOE) is

206

207 begin

208

209 if(FSMC_NOE='0' and FSMC_NOE'event) then --直接在NOE的下降沿更新數(shù)據(jù)

210

211 case (Adr_L) is

212

213 when "00000001" =>

214

215 data_buf <= AD0_H_data; --0x01

216

217 when "00000010" =>

218

219 data_buf <= AD0_L_data; --0x02

220

221 when "00000011" =>

222

223 data_buf <= AD1_H_data; --0x03

224

225 when "00000100" =>

226

227 data_buf <= AD1_L_data; --0x04

228

229 when others => data_buf <= "ZZZZZZZZ";

230

231 end case;

232

233 end if;

234

235 end process;

236

237 end;

238

239

240

241

242

243