1 50MHz capture of an ADE7758 SPI communications.
2 Note that Chip Select is _optional_ on this device, provided that you are
3 careful to only use valid, full length spi read/write requests.
5 In this case, the chip is configured to provide interrupts on voltage zero
6 crossings, and the host MCU is reading the status register, and then the
7 appropriate (phase B) voltage/current registers.
9 It is largely an example of SPI without CS, in spi mode 0,1.
11 Two captures are provided.
12 ade7758-phaseB-zx-irq-context.sr: trigger with precapture on the IRQ pin falling edge.
13 ade7758-phaseB-zx-irq-nocontext.sr: trigger on spi CLK rising edge.
15 Correct decodings with the ADE7758 decoder should show
17 FREQ: 0x0 (frequency is from phase A, not connected on this device)
18 BVRMS: 0x10cd0c (context) or 0x10ccfa (nocontext)
19 BIRMS: 0x2ac (context) or 0x2a8 (nocontext)
21 Anything else has gotten the SPI decoding wrong due to the lack of chip select.