CFA633-RDI-KU datasheet(35/86 Pages) CRYSTAIFONTZ

35 / 86 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KU LCD Module (Hardware v2.0 / Firmware u2v1)

February 2012

Page 35

0x81: Fan Speed Report

If any of up to four fans connected to CFA633 is configured to report its speed information to the host, the CFA633 will

send Fan Speed Reports for each selected fan every 1/2 second. See command 16 (0x10): Set Up Fan

Reporting (Pg. 43).

type = 0x81

data_length = 4

data[0] is the index of the fan being reported:

0 = FAN 1

1 = FAN 2

2 = FAN 3

3 = FAN 4

data[1] is number_of_fan_tach_cycles

data[2] is the MSB of Fan_Timer_Ticks

data[3] is the LSB of Fan_Timer_Ticks

The following C function will decode the fan speed from a Fan Speed Report packet into RPM:

int OnReceivedFanReport(COMMAND_PACKET *packet, char * output)

{

int

return_value;

return_value=0;

int

number_of_fan_tach_cycles;

number_of_fan_tach_cycles=packet->data[1];

if(number_of_fan_tach_cycles<3)

sprintf(output," STOP");

else if(number_of_fan_tach_cycles<4)

sprintf(output," SLOW");

else if(0xFF==number_of_fan_tach_cycles)

sprintf(output," ----");

else

{

//Specific to each fan, most commonly 2

int

pulses_per_revolution;

pulses_per_revolution=2;

int

Fan_Timer_Ticks;

Fan_Timer_Ticks=(*(unsigned short *)(&(packet->data[2])));

return_value=((27692308L/pulses_per_revolution)*

(unsigned long)(number_of_fan_tach_cycles-3))/

(Fan_Timer_Ticks);

sprintf(output,"%5d",return_value);

}

return(return_value);

}

0x82: Temperature Sensor Report

If any of the up to 32 temperature sensors is configured to report to the host, the CFA633 will send Temperature Sensor

Reports for each selected sensor every second. See the command 19 (0x13): Set Up Temperature Reporting (Pg. 46).

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