ADE7913 SPI problem

How long do you wait after power up before enabling clk out? 

This is my arduino code I use with a bluepill. This works for me 100% of the time 

Serial.begin(115200);
while (!Serial);
Serial.println("serial config done");

SPI.begin (); // set io12,13,14 as sp SPI.setHwCs(false); //disable io15 as csb
SPI.setBitOrder(MSBFIRST); // Set the SPI_1 bit order
SPI.setDataMode(SPI_MODE3); //Set the SPI_2 data mode 0
SPI.setClockDivider(SPI_CLOCK_DIV16); // Slow speed (72 / 16 = 4.5 MHz SPI_1 speed)

pinMode(CS_A, OUTPUT);
pinMode(CS_B, OUTPUT);
pinMode(CS_C, OUTPUT);
pinMode(CLK_RDYB_C,INPUT);
digitalWrite(CS_A, HIGH);
digitalWrite(CS_B, HIGH);
digitalWrite(CS_C, HIGH);

ADE7913_SPI_WRITE(CONFIG,0x21,0x1,CS_A); //clkout 4Mhz    lots of time before the code gets here.

Serial.println("write config done");

Serial.println( ADE7913_SPI_READ(CONFIG, 0x1,CS_A));
Serial.println("read config done");

https://www.analog.com/media/en/technical-documentation/data-sheets/ADE7912_7913.pdf

Pg 33 shows the power up to part ready for comms timing. 

Hi Smith.

It takes about 1~2 second from power up to enabling clkout via my CLI environment.

Hi, Smith.

I tested spi write/read with consider READYb pin signal and it reduce interface error.

I think occur interface error when 2 write or read in 1 periode of ready.
But I can't find any related information in the datasheet.

Is there any data with this information?

Sincery.
JaeKyung.

I have not seen this problem. I will have to test when I have time. 

How are you generating your 4.096Mhz clk? 

is it 4.096Mhz?

what is you expected spi speed in you micro? Is it 3.864Mhz

If you slow down spi speed does the issue improve?

Dave