ZBasic System Library
302
ZBasic Microcontrollers
Type
Function returning UnsignedInteger
Invocation
SPIGetData(channel, readCnt, readData, writeData)
SPIGetData(channel, readCnt, readData)
Parameter
Method
Type
Description
channel
ByVal
Byte
The SPI channel number (1-4).
readCnt
ByVal
integral
The number of bytes to read (0 – 65535).
readData
ByRef
any type
The variable in which to place the data read from the slave device.
writeData
ByVal
Byte
The data value to send to the slave for each byte received.
Discussion
This function sends a data byte to an SPI slave the specified number of times and stores the byte
returned by the slave in response in successive bytes of the variable provided (typically a Byte array).
For the second form, the data byte sent while receiving is zero. The value returned is equal to the
number of bytes placed in the variable. If the channel number is invalid or the channel is not properly
prepared, the return value is zero. Note that this is a low level function that must be used in concert with
other low level routines to effect an SPI bus transaction.
Example
Dim idata(1 to 10) as Byte
Call OpenSPI(1, 0, 12)
Call SPIStart(1, &H03)
Call SPIGetData(1, 10, idata)
Compatibility
This routine is not available in BasicX compatibility mode nor it is available for VM devices.
See Also
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