W25Q power down not working

[freeflyer]

I am using an STM32L433 with a W25Q128JVSIQ flash.

I can read and write data but the W25Q does not seem to respond to the power down command.

When I send the power down command 0xB9, reading data from the W25Q should not be possible until the release command 0xAB is sent.  

However, I am not sending this release command but can read data from the W25Q, which indicates it did not enter power down.

 

 

Below is a scope capture of the power down command and it looks correct...

I am using the following driver for the W25Q...

https://github.com/mengguang/w25qxx

Below is the function I wrote to power down the W25Q...

 

#define W25QXX_POWERDOWN 0xB9

void w25qxx_powerDown(W25QXX_HandleTypeDef *w25qxx)
{
	uint8_t tx[1] = {W25QXX_POWERDOWN};
	cs_on(w25qxx);
 w25qxx_transmit(w25qxx, tx, 1);
 cs_off(w25qxx);
}

I even tried adding a delay (1ms) before the CS pin is raised high after the 0xB9 command has been sent, but it still did not enter power down.

With a previous setup I had many months ago, the power down used to work.  I confirmed power down was successful by trying to read data without sending the release command.  The fact I could not read data until the release command was sent indicated the power down was successful.

[freeflyer]

My mistake.... the power down was working afterall

I did not realise I was sending the release command, if I remove the release command then the W25Q read fails