PNI Sensor Corporation
DOC#1018122 r02
PNI CommBoard User Manual
Page 9
5
SPI Operation
The RM3100 Evaluation Board, RM3000-f Evaluation Board and V2Xe incorporate a SPI
interface. For the RM3100 an I
2
C interface is also available, as discussed in Section 6. This
section reviews how to use the CommBoard to communicate with these SPI devices via a
computer using a terminal emulation program. Note the CommBoard not only converts UART
to SPI, but it also allows for control and monitoring of the SSN, CLEAR, and DRDY lines.
5.1 SPI Commands
A summary of the commands relevant for working with SPI devices is given below.
Table 5-1: SPI Command Summary Table
ASCII
Char.
Command
Syntax
Response
W, w
SPI Write
W{NIML}#(delimiter){{NIML}#(delimiter)
…}{<CR>}
R, r
SPI Read
R{#}{S}(NIML){{#}{S}(N
IML)…}<CR>
#{(delimiter)#...}{<CR>}
,
<SP>
<TAB>
<CR>
Delimiter
Delimiters. Used to separate characters or data
in a string. Sending a delimiter also changes the
default delimiter used in the return data string
sent to host.
X, x
Hex/ Decimal
X = Hex mode (default), x= Decimal mode
~
Hold for
DRDY
~1 = Hold until DRDY HIGH,
~0 = Hold until DRDY LOW
Y, y
Hold Always
Y
Q
Quit Hold
Q
(Capital „Q‟ only)
F
Flush UART
Receive
Buffer
F
(Capital „F‟ only)
?
Handshake
Status
?
Num2str (Uint8) or
dec2hex(Uint8). More
verbose in terminal
mode
!
Pulse CLEAR
pin
!
$
SSN Control
$1 = Set SSN HIGH, $0=Set SSN LOW
.
Pause 2 ms
.
V, v
CPHA Setting
“V” sets CPHA=1, “v” sets CPHA=0
O, o
CPOL Setting
“O” sets CPOL=1, “o” sets CPOL=0
Z, z
Clock Rate
“Z” = 1 MHz, “z” = 50 kHz, default = 100 kHz
T, t
Terminal
Mode
“T” turns on verbose terminal mode. “t” turns off
terminal mode.
For
“T”: Sign-on text
including mode and
version number
Summary of Contents for CommBoard
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