module ADC_control(clk48m,rst,VAREF,data_out,button_input);
input clk48m;//pay more attention to the ADC clock , it's need to 40M
input rst;
input button_input;
inout VAREF;
output[7:0] data_out; //结果送到LED上
wire clk10m;
wire clk40m;
//-----------------------------control the ADC------------------------------------------
reg[2:0] state;
reg[11:0] adc_result;
wire DATAVALID;
wire CALIBRATE;
wire BUSY;
wire[11:0] ADC_RESULT;
wire data_come;
reg ADCSTART;
reg ADCRESET;
assign data_come=(~BUSY)&DATAVALID;//意味数据有效
always@(posedge clk10m)
begin
if(rst )
begin
state<=3'b000;
ADCRESET<=1'b1; //ADC initial state
ADCSTART<=1'b0; //not start to ADC
adc_result<=12'h000; //the ADC result
end
else case(state)
3'b000: begin
ADCRESET<=1'b0;
ADCSTART<=1'b0;
adc_result<=adc_result;
state<=3'b001;
end
3'b001: begin ////let the ADC start to work
ADCRESET<=1'b0;
adc_result<=adc_result;
if(CALIBRATE) //上电校准后,启动AD转换
begin state<=3'b001;ADCSTART<=1'b0; end
else begin state<=3'b011; ADCSTART<=1'b1; end
end
3'b011: begin
ADCRESET<=1'b0;
if(data_come)//读取结果
begin
adc_result<=ADC_RESULT;
state<=3'b000;ADCSTART<=1'b0;
end
else begin
adc_result<=adc_result;
state<=3'b011;ADCSTART<=1'b1;
end
end
default: begin
ADCRESET<=1'b0;
ADCSTART<=1'b0;
adc_result<=12'h000;
state<=3'b000;
end
endcase
end
assign data_out=button_input?adc_result[11:4]:8'b1111_1111;
pll_analog MM(.POWERDOWN(1'b1),.CLKA(clk48m),.LOCK(),.GLA(clk40m),.GLB(clk10m));
intern_voltage M_ADC(
.SYS_CLK(clk40m),
.SYS_RESET(!rst),
.VAREF(VAREF),
.DATAVALID(DATAVALID),
.INTERNAL_TEMPERATURE_STB(1'b1),//使能内部温度
.ADCSTART(ADCSTART),//ADC begin to work
.ADCRESET(ADCRESET),//ADC initial state
.PWRDWN(1'b0),
.MODE(4'b0110), //8'bit not power down
.VAREFSEL(1'b0), //inter reference voltage
.STC(8'b00000101), //the ADC result keep 7 waiting ADCCLOCK
.TVC(8'b00000000), //ADCCLOCK=SYSCLK/4
.CHNUMBER(5'b11111),//选择读温度
.CALIBRATE(CALIBRATE),
.BUSY(BUSY),
.SAMPLE(),
.ADC_RESULT(ADC_RESULT),//ADC result
.ACMCLK(), //如果读内部温度,这个信号没有用吧?
.INIT_ADDR(), //如果读内部温度,这个信号没有用吧?
.INIT_DATA(), //如果读内部温度,这个信号没有用吧?
.INIT_ACM_WEN() //如果读内部温度,这个信号没有用吧?
);
endmodule
我是这样配置的,可读取的内核温度值总是0, 怎样才能读取到正确的值? |
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