Software Control
2.2.4.5
Low Level View
Clicking
Low Level View
opens the ADS54J54 EVM SPI GUI Low Level View tab, shown in
. This
tab allows for direct read/write access to each bit of each SPI address for both the ADS54J54 and the
LMK04828. This is also the tab used to load a previously saved configuration file or to save a new
configuration file once a specific EVM configuration is properly set up. There are several ways to
accomplish a read or write to a specific register. Highlighting a particular
Register Name
will cause the bits
of that register to display on the right side of the window. If there is a bit in that register that has a
datasheet definition, then that definition is shown in the GUI. In the example shown in the figure, bit 4 of
address 0x00 is the bit to choose between 3-wire SPI or 4-wire SPI for the LMK04828. To set a bit to a '1',
check the box for that bit in the W column, then click
Write Register
. The GUI will write that register and
then immediately read back that register. If the write was successful, then the R column should reflect
what was just written from the W column. Another way to do an SPI access is to enter the address in the
Address
control at the bottom of the window and then click the
Write Register
or
Read Register
below it.
Be sure to select the correct 'Block' first. If there are more than one devices with SPI access such as on
this EVM, then there is a 'Block' for each device. The ADS54J54 EVM SPI GUI has a
Block
of ADS54J54
addresses and a
Block
of LMK04828 addresses.
Figure 9. Low Level Controls Tab
13
SLAU616A – January 2015 – Revised January 2016
ADS54J54 Evaluation Module
Copyright © 2015–2016, Texas Instruments Incorporated
