Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Altera_Forum
Honored Contributor I
1,085 Views

Please, help me to correct verilog module for temperature sensor (MAX1619, SMBus)

Hi,

 

I am fighting with temperature sensor on DE3 board. I need to read temperature of FPGA and I do not want to use NIOS. According to manual, MAX1619 has SMBus interface and I should send very simple sequence to get temperature:

 

<Start> <Address=7'b0011000> <WR=0> <Ask> <Data=8'h01> <Ask> <Start> <Address=7'b0011000> <RD=1> <Ask> <Reading data> <Stop>

 

I implemented it on verilog as following:

 

Code:

////////// CLOCK //////////

output CLK_OUT;

input EXT_CLK;

input OSC1_50;

input OSC2_50;

input OSC_BA;

input OSC_BB;

input OSC_BC;

input OSC_BD;

 

////////// SEG7 //////////

output [6:0] HEX0;

output HEX0_DP;

output [6:0] HEX1;

output HEX1_DP;

////////// MAX1619 (TEMPERATURE SENSOR) //////////

output TEMP_CLK;

inout TEMP_DATA;

input TEMP_INTn;

 

 

//...

 

// Temperature sensor

reg [7:0] Display;

reg [31:0] TempTimer;

reg [6:0] TempCounter;

reg [127:0] TempCLK, TempOUT, TempRES, TempDIR;

 

always @(posedge OSC1_50) TempTimer<=TempTimer+1; // 50MHz clock

 

initial

begin

TempCounter=0;

// S ADDRESS WR ASK COMMAND ASK S ADDRESS RD ASK DATA P

TempCLK=128'b11110_010_010_010_010_010_010_010__010_010__010_010_010_010_010_010_010_010__010_110__010_010_010_010_010_010_010__010_010__010_010_010_010_010_010_010_010__001111111111111;

TempDIR=128'b11111_111_111_111_111_111_111_111__111_000__111_111_111_111_111_111_111_111__000_111__111_111_111_111_111_111_111__111_000__000_000_000_000_000_000_000_000__111111111111111;

TempOUT=128'b11100_000_000_111_111_000_000_000__000_000__000_000_000_000_000_000_000_111__000_100__000_000_111_111_000_000_000__111_000__000_000_000_000_000_000_000_000__111101111111111;

// 76543 210 987 654 321 098 765 432 109 876 543 210 987 654 321 098 765 432 109 876 543 210 987 654 321 098 765 432 109 876 543 210 987 654 321 098 765 432109876543210;

// 22222 222 111 111 111 100 000 000 009 999 999 999 888 888 888 877 777 777 776 666 666 666 555 555 555 544 444 444 443 333 333 333 222 222 222 211 111 111110000000000;

end

 

always @(posedge TempTimer[11]) // 50MHz/4096=12KHz

begin

TempCounter=128-TempTimer[18:12];

TEMP_CLK=TempCLK[TempCounter];

if(TempDIR[TempCounter]==1'b0)

TempRES[TempCounter]=TEMP_DATA;

else

TEMP_DATA=TempOUT[TempCounter];

end

 

 

always @(posedge TempTimer[11]) // here I print the temperature on 7-seg display

begin

Display={TempRES[37], TempRES[34], TempRES[31], TempRES[28], TempRES[25], TempRES[22], TempRES[19], TempRES[16]};

case(Display/100)

2'h0: begin HEX0_DP=1; HEX1_DP=1; end

2'h1: begin HEX0_DP=0; HEX1_DP=1; end

2'h2: begin HEX0_DP=0; HEX1_DP=0; end

2'h3: begin HEX0_DP=0; HEX1_DP=0; end

endcase

case(Display%10)

4'h0: HEX0=~63;

4'h1: HEX0=~6;

4'h2: HEX0=~91;

4'h3: HEX0=~79;

4'h4: HEX0=~102;

4'h5: HEX0=~109;

4'h6: HEX0=~125;

4'h7: HEX0=~7;

4'h8: HEX0=~127;

4'h9: HEX0=~111;

4'ha: HEX0=~119;

4'hb: HEX0=~124;

4'hc: HEX0=~57;

4'hd: HEX0=~94;

4'he: HEX0=~121;

4'hf: HEX0=~113;

endcase

case((Display/10)%10)

4'h0: HEX1=~63;

4'h1: HEX1=~6;

4'h2: HEX1=~91;

4'h3: HEX1=~79;

4'h4: HEX1=~102;

4'h5: HEX1=~109;

4'h6: HEX1=~125;

4'h7: HEX1=~7;

4'h8: HEX1=~127;

4'h9: HEX1=~111;

4'ha: HEX1=~119;

4'hb: HEX1=~124;

4'hc: HEX1=~57;

4'hd: HEX1=~94;

4'he: HEX1=~121;

4'hf: HEX1=~113;

endcase

end

hence I defined 4 x 128 bit arrays: TempCLK, TempOUT, TempRES, TempDIR, so that

 

  • TempCLK[i] what I will send to Clock of SMBus,
  • TempDIR[i]==1 then I am writing to the SMBus, TempDIR[i]==0 then I am reading form
  • TempOUT[i] what I should send to SMBus if I am writing,
  • TempRES[i] what I am reading from SMBus if I am reading.

 

 

Please, advise me what I did wrong, I played a lot, but I still cannot get temperature from this sensor.

 

Thank you

 

Sincerely,

 

Ilghiz

0 Kudos
0 Replies
Reply