Remote-processing RPC-210 Manuel d'utilisateur télécharger pdf (Page 24)

SERIAL & SPI PORTS BASIC SECTION 4

Page 4-6

SPI PORT

Signals to communicate write to SPI compatible devices

are available at J7. Relevant signals are shown below:

J7 Pin Description

10 Chip select (I/O address 0A307H)

14 MSIO - Data to device

16 MOSI - Data from device

18 SCLK - serial clock to device

Additional chip selects are available at J3. Be sur e to

configure the appropriate port (A, B, or C) as an output.

Command SP I both reads and wr ites out the SPI port.

SCON reads and writes to the SPI configuration register.

Data range for both SCO N and SP I is 0-255. Data is

transferred 8 bits at a time. For an example of

transferring 16 data bits at a time, review SPI.BAS.

This exam ple progr am uses SPI com mands to w rite to

the on board COM 1 UART.

The following program fragment shows how to use SPI

and SPICON.

10 SPI = 80H Write to SPI port

20 RX = SPI Read from SPI port

30 SCON = 30h Write to configuration

Possible configurations for SPI communication are

described below. Usually the only changes necessary

are the CPH A and CPO L bits. Pow er up default, set by

RPBASIC-52, is in parens. Use the SC ON c omm and to

write to the SPI configuration register.

Increasing the clock r ate (SPR 0,1) will not speed up data

access.

Bit

Pos

Name Description

0,1 SPR0,1 Clock rate select (0,0 = 2.74

MHZ)

2 CPHA Clock phase select (0 = leading

edge latch)

3 CPOL Clock polarity (0 = idles low)

4 SPIM Master/slave mode select (1 =

master)

5 SPE SPI enable (1 = enable)

6 WCOL Write collision error flag

7 ISPI SPI interrupt (not used)

APPLICATION PROGRAMS

The following programs are in the BASIC 52 directory.

File Description

210_MULT.BAS Multitasking routines

with ON COM

RDRTS1.BAS Read and display status

of RTS signal from

external device.

WRCTS1.BAS Set CTS output high and

low.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 59 60

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Remote-processing RPC-210 Manuel d'utilisateur Page 24

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Remote-processing RPC-210 Manuel d'utilisateur Page 24

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