User`s manual

160 eDisplay (OP7200)

PARAMETERS

handle is an address index to device information. Use rn_device() or rn_find() to establish the

handle.

retdata is a pointer to the return address of the communication byte. A set bit indicates which error

occurred. This register is cleared when read.

7—Data available and waiting to be processed MOSI (master out, slave in)

6—Write collision MISO (master in, slave out)

5—Overrun MOSI (master out, slave in)

4—Mode fault, device detected hardware fault

3—Data compare error detected by device

2,1,0—Reserved

RETURN VALUE

The status byte from the previous command.

D.3.1 Status Byte

Unless otherwise specified, functions returning a status byte will have the following format

for each designated bit.

int rn_comm_status(int handle, char *retdata);

7 6 5 4 3 2 1 0

× ×

00 = Reserved

01 = Ready

02 = Busy

03 = Device not connected

0 = Device

1 = Hub

× Reserved for devices

0 = Last command accepted

1 = Last command unexecuted

0 = Not expired

1 = HW or SW watchdog timer

expired

* Use the function rn_rst_status() to determine which timer expired.