CFA633-RDI-KS datasheet(38/88 Pages) CRYSTAIFONTZ

38 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 38

The following C function will decode the Temperature Sensor Report packet into °C and °F:

void OnReceivedTempReport(COMMAND_PACKET *packet, char *output)

{

//First check the DOW CRC return code from the CFA633

if(packet->data[3]==0)

strcpy(output,"BAD CRC");

else

{

double

degc;

degc=(*(short *)&(packet->data[1]))/16.0;

double

degf;

degf=(degc*9.0)/5.0+32.0;

sprintf(output,"%9.4f°C =%9.4f°F",

degc,

degf);

}

COMMAND CODES

Below is a list of valid commands for the CFA633. Each command packet is answered by either a response packet or

an error packet.The low 6 bits of the type field of the response or error packet is the same as the low 6 bits of the type

field of the command packet being acknowledged.

0 (0x00): Ping Command

The CFA633 will return the Ping Command to the host.

type: 0x00 = 010

valid data_length is 0 to 16

data[0-(data_length-1)] can be filled with any arbitrary data

The return packet is identical to the packet sent, except the type will be 0x40 (normal response, Ping Command):

type: 0x40 | 0x00 = 0x40 = 6410

data_length = (identical to received packet)

data[0-(data_length-1)] = (identical to received packet)

1 (0x01): Get Hardware & Firmware Version

The CFA633 will return the hardware and firmware version information to the host.

type: 0x01 = 110

valid data_length is 0

The return packet will be:

type: 0x40 | 0x01 = 0x41 = 6510

data_length = 16

data[] = "CFA633:h#.#,y#v#"

X.X is the hardware revision, "h2.0" for example

Y.Y is the firmware version, "s2v1" for example

2 (0x02): Write User Flash Area

The CFA633 reserves 16 bytes of nonvolatile memory for arbitrary use by the host. This memory can be used to store

a serial number, IP address, gateway address, netmask, or any other data required. All 16 bytes must be supplied.

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