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。
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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