之前毕业设计写过的用在FPGA上的BH1750光线传感器verilog驱动代码，亲测可用，有什么问题欢迎留言。
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module BH1750_drive(
input clk, //输入时钟=50M
input rst, //输入复位信号，低电平有效
output scl, //输出I2C时钟管脚
inout sda, //I2C数据管脚
output dvi, //BH1750DVI上电配置管脚
output [15:0] data_out //BH1750数据输出管脚
);
reg r_scl; //I2C_SCL寄存器
reg r_sda; //I2C_SDA寄存器
reg ctl_sda; //sda输入/输出控制
assign sda = ctl_sda ? r_sda : 1'bz; //配置三态接口
assign scl = r_scl;
assign dvi = 1; //配置上电
reg [15:0] data; //数据采集管脚
assign data_out = data[15:0];
reg [11:0] cnt_100khz; //定义一个计数器，用于产生100Khz时钟
reg clk_100khz; //产生100Khz的时钟
always @ (posedge clk or negedge rst) begin //posedge上升沿触发或者negedge下降沿触发
if (!rst) begin
cnt_100khz <= 12'd0;
clk_100khz <= 1'b0;
end
else if (cnt_100khz < 12'd2499)
cnt_100khz <= cnt_100khz + 1'b1;
else begin
cnt_100khz <= 12'd0;
clk_100khz <= ~ clk_100khz;
end
end
parameter [7:0] DEVICE_ADDR_W = 8'h46; //BH1750FVI设备地址+写
parameter [7:0] DEVICE_ADDR_R = 8'h47; //BH1750FVI设备地址+读
parameter [7:0] DEVICE_POWER_OFF = 8'h00; //BH1750FVI设备关断
parameter [7:0] DEVICE_POWER_ON = 8'h01; //BH1750FVI设备上电
parameter [7:0] DEVICE_MEASURE = 8'h13; //BH1750FVI设备测量环境光
reg [11:0] cnt;
always@(posedge clk_100khz or negedge rst) begin
if(!rst) begin
ctl_sda<=1'b1;r_sda<=1'b1;
r_scl<=1'b1;
cnt<=0;
end else begin
cnt<=cnt+1'b1;
case(cnt)
//外部地址+写+断电---------------------------------------------------------//
0: begin ctl_sda<=1'b1; end
//START
1: begin r_scl<=1'b1; end
2: begin r_sda<=1'b1; end
3: begin r_sda<=1'b0; end
//ADDRESS+WRITE 8'H46
4: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[7]; end
5: begin r_scl<=1'b1; end
6: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[6]; end
7: begin r_scl<=1'b1; end
8: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[5]; end
9: begin r_scl<=1'b1; end
10: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[4]; end
11: begin r_scl<=1'b1; end
12: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[3]; end
13: begin r_scl<=1'b1; end
14: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[2]; end
15: begin r_scl<=1'b1; end
16: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[1]; end
17: begin r_scl<=1'b1; end
18: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[0]; end
19: begin r_scl<=1'b1; end
20: begin r_scl<=1'b0; end
21: begin ctl_sda<=1'b0; end
22: begin r_scl<=1'b1; end
23: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=24;
end else
cnt<=22;
end
//POWER OFF 8'H00
24: begin ctl_sda<=1'b1; end
25: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[7]; end
26: begin r_scl<=1'b1 ; end
27: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[6]; end
28: begin r_scl<=1'b1 ; end
29: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[5]; end
30: begin r_scl<=1'b1 ; end
31: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[4]; end
32: begin r_scl<=1'b1 ; end
33: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[3]; end
34: begin r_scl<=1'b1 ; end
35: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[2]; end
36: begin r_scl<=1'b1 ; end
37: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[1]; end
38: begin r_scl<=1'b1 ; end
39: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_OFF[0]; end
40: begin r_scl<=1'b1 ; end
41: begin r_scl<=1'b0; end
42: begin ctl_sda<=1'b0; end
43: begin r_scl<=1'b1; end
44: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=45;
end else
cnt<=43;
end
45: begin ctl_sda<=1'b1; end
//STOP
46: begin r_scl<=1'b1; end
47: begin r_sda<=1'b0; end
48: begin r_sda<=1'b1; end
//外部地址+写+上电---------------------------------------------------------//
49: begin ctl_sda<=1'b1; end
//START
50: begin r_scl<=1'b1; end
51: begin r_sda<=1'b1; end
52: begin r_sda<=1'b0; end
//ADDRESS+WRITE 8'H46
53: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[7]; end
54: begin r_scl<=1'b1; end
55: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[6]; end
56: begin r_scl<=1'b1; end
57: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[5]; end
58: begin r_scl<=1'b1; end
59: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[4]; end
60: begin r_scl<=1'b1; end
61: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[3]; end
62: begin r_scl<=1'b1; end
63: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[2]; end
64: begin r_scl<=1'b1; end
65: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[1]; end
66: begin r_scl<=1'b1; end
67: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[0]; end
68: begin r_scl<=1'b1; end
69: begin r_scl<=1'b0; end
70: begin ctl_sda<=1'b0; end
71: begin r_scl<=1'b1; end
72: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=73;
end else
cnt<=71;
end
//POWER OFF 8'H00
73: begin ctl_sda<=1'b1; end
74: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[7]; end
75: begin r_scl<=1'b1 ; end
76: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[6]; end
77: begin r_scl<=1'b1 ; end
78: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[5]; end
79: begin r_scl<=1'b1 ; end
80: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[4]; end
81: begin r_scl<=1'b1 ; end
82: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[3]; end
83: begin r_scl<=1'b1 ; end
84: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[2]; end
85: begin r_scl<=1'b1 ; end
86: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[1]; end
87: begin r_scl<=1'b1 ; end
88: begin r_scl<=1'b0 ; r_sda<=DEVICE_POWER_ON[0]; end
89: begin r_scl<=1'b1 ; end
90: begin r_scl<=1'b0; end
91: begin ctl_sda<=1'b0; end
92: begin r_scl<=1'b1; end
93: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=94;
end else
cnt<=92;
end
94: begin ctl_sda<=1'b1; end
//STOP
95: begin r_scl<=1'b1; end
96: begin r_sda<=1'b0; end
97: begin r_sda<=1'b1; end
////外部地址+写+读取单次---------------------------------------------------------//
98: begin ctl_sda<=1'b1; end
//START
99: begin r_scl<=1'b1; end
100: begin r_sda<=1'b1; end
101: begin r_sda<=1'b0; end
//ADDRESS+WRITE 8'H46
102: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[7]; end
103: begin r_scl<=1'b1; end
104: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[6]; end
105: begin r_scl<=1'b1; end
106: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[5]; end
107: begin r_scl<=1'b1; end
108: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[4]; end
109: begin r_scl<=1'b1; end
110: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[3]; end
111: begin r_scl<=1'b1; end
112: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[2]; end
113: begin r_scl<=1'b1; end
114: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[1]; end
115: begin r_scl<=1'b1; end
116: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_W[0]; end
117: begin r_scl<=1'b1; end
118: begin r_scl<=1'b0; end
119: begin ctl_sda<=1'b0; end
120: begin r_scl<=1'b1; end
121: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=122;
end else
cnt<=120;
end
//POWER OFF 8'H23
122: begin ctl_sda<=1'b1; end
123: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[7]; end
124: begin r_scl<=1'b1 ; end
125: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[6]; end
126: begin r_scl<=1'b1 ; end
127: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[5]; end
128: begin r_scl<=1'b1 ; end
129: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[4]; end
130: begin r_scl<=1'b1 ; end
131: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[3]; end
132: begin r_scl<=1'b1 ; end
133: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[2]; end
134: begin r_scl<=1'b1 ; end
135: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[1]; end
136: begin r_scl<=1'b1 ; end
137: begin r_scl<=1'b0 ; r_sda<=DEVICE_MEASURE[0]; end
138: begin r_scl<=1'b1 ; end
139: begin r_scl<=1'b0; end
140: begin ctl_sda<=1'b0; end
141: begin r_scl<=1'b1; end
142: begin
r_scl<=1'b0;
if(sda==1'b0) begin
cnt<=143;
end else
cnt<=141;
end
143: begin ctl_sda<=1'b1; end
//STOP
144: begin r_scl<=1'b1; end
145: begin r_sda<=1'b0; end
146: begin r_sda<=1'b1; end
////读取测量值---------------------------------------------------------//
2147: begin ctl_sda<=1'b1; end
//START
2148: begin r_scl<=1'b1; end
2149: begin r_sda<=1'b1; end
2150: begin r_sda<=1'b0; end
//ADDRESS+WRITE 8'H46
2151: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[7]; end
2152: begin r_scl<=1'b1; end
2153: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[6]; end
2154: begin r_scl<=1'b1; end
2155: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[5]; end
2156: begin r_scl<=1'b1; end
2157: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[4]; end
2158: begin r_scl<=1'b1; end
2159: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[3]; end
2160: begin r_scl<=1'b1; end
2161: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[2]; end
2162: begin r_scl<=1'b1; end
2163: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[1]; end
2164: begin r_scl<=1'b1; end
2165: begin r_scl<=1'b0; r_sda<=DEVICE_ADDR_R[0]; end
2166: begin r_scl<=1'b1; end
2167: begin r_scl<=1'b0; r_sda<=1; end
2168: begin ctl_sda<=1'b0; end
2169: begin r_scl<=1'b1; end
2170: begin r_scl<=1'b0;
if(sda==1'b0)
begin
cnt<=2171; end
else
cnt<=2169;
end
//READ
2171: begin r_scl<=1'b1 ; end
2172: begin data[15]=sda ; end
2173: begin r_scl<=1'b0 ; end
2174: begin r_scl<=1'b1 ; end
2175: begin data[14]=sda ; end
2176: begin r_scl<=1'b0 ; end
2177: begin r_scl<=1'b1 ; end
2178: begin data[13]=sda ; end
2179: begin r_scl<=1'b0 ; end
2180: begin r_scl<=1'b1 ; end
2181: begin data[12]=sda ; end
2182: begin r_scl<=1'b0 ; end
2183: begin r_scl<=1'b1 ; end
2184: begin data[11]=sda ; end
2185: begin r_scl<=1'b0 ; end
2186: begin r_scl<=1'b1 ; end
2187: begin data[10]=sda ; end
2188: begin r_scl<=1'b0; end
2189: begin r_scl<=1'b1; end
2190: begin data[9]=sda ; end
2191: begin r_scl<=1'b0; end
2192: begin r_scl<=1'b1; end
2193: begin data[8]=sda ; end
2194: begin r_scl<=1'b0; end
2195: begin r_scl<=1'b1;ctl_sda<=1'b1;r_sda<=1'b0;end
2196: begin r_scl<=1'b1; end
2197: begin r_scl<=1'b0; ctl_sda<=1'b1; r_sda<=1'b1; end
2198: begin ctl_sda<=0;end
2199: begin r_scl<=1'b1 ; end
2200: begin data[7]=sda ; end
2201: begin r_scl<=1'b0 ; end
2202: begin r_scl<=1'b1 ; end
2203: begin data[6]=sda ; end
2204: begin r_scl<=1'b0 ; end
2205: begin r_scl<=1'b1 ; end
2206: begin data[5]=sda ; end
2207: begin r_scl<=1'b0 ; end
2208: begin r_scl<=1'b1 ; end
2209: begin data[4]=sda ; end
2210: begin r_scl<=1'b0 ; end
2211: begin r_scl<=1'b1 ; end
2212: begin data[3]=sda ; end
2213: begin r_scl<=1'b0 ; end
2214: begin r_scl<=1'b1 ; end
2215: begin data[2]=sda ; end
2216: begin r_scl<=1'b0; end
2217: begin r_scl<=1'b1; end
2218: begin data[1]=sda ; end
2219: begin r_scl<=1'b0; end
2220: begin r_scl<=1'b1; end
2221: begin data[0]=sda ; end
2222: begin r_scl<=1'b0; end
2223: begin ctl_sda<=1'b1; r_sda<=1;end
default:begin r_scl<=1'b1; ctl_sda<=1'b0; end
endcase
end
end
endmodule
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