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Analog Devices ADE7758
-------------------------------------------------------------------------------
This is a set of example captures of ADE7758 SPI communications.
Note that Chip Select is _optional_ on this device, provided that you are
careful to only use valid, full length SPI read/write requests.
Details:
http://www.analog.com/en/products/analog-to-digital-converters/integrated-special-purpose-converters/energy-metering-ics/ade7758.html
Logic analyzer setup
--------------------
The logic analyzer used was a Saleae Logic16 clone (at 50MHz):
Probe ADE7758 pin
-----------------------
0 CLK
1 MISO
2 MOSI
3 IRQ
Data
----
In this case, the chip is configured to provide interrupts on voltage zero
crossings, and the host MCU is reading the status register, and then the
appropriate (phase B) voltage/current registers.
It is largely an example of SPI without CS, in SPI mode 0,1.
Correct decodings with the ADE7758 decoder should show:
RSTATUS: 0x400
FREQ: 0x0 (frequency is from phase A, not connected on this device)
BVRMS: 0x10cd0c (context) or 0x10ccfa (nocontext)
BIRMS: 0x2ac (context) or 0x2a8 (nocontext)
ade7758-phaseB-zx-irq-context.sr
--------------------------------
Trigger with precapture on the IRQ pin falling edge.
ade7758-phaseB-zx-irq-nocontext.sr
----------------------------------
Trigger on SPI CLK rising edge.
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