SPI NSS Pin is set too early on send

[espruino-discuss3]

Posted at 2016-12-22 by GeekBot

Hello,

I try to connect a radio module using an SPI link (on SPI3, Espruino Pico, Firmware V1.90)
Here is my code :

SPI3.setup({sck:B3, miso:B4, mosi:B5, baud:10000, mode:0, order:'msb'});
var registreW = {data : 0x81, count : 1};
var modeASK = {data : 0x23, count : 1};
var returnedData;
returnedData = SPI3.send(registreW,A7);
console.log(returnedData[0]);
returnedData = SPI3.send(modeASK,A7);
console.log(returnedData[0]);

NSS Pin is A7.
Since this code doesn't work (communication doesn't work), I had a look at signals with the logic state analyzer.
I attach a screen capture. In fact, NSS PIN is set high too early, when the last byte is not totally sent. I looked at the code line 212, the PIN change seems to be executed without knowledge of end of transmission, but I can be wrong !!
Help will be greatly appreciated.
Best regards
GeekBot

---

Attachments:

• SPI-NSS-pb.PNG

[espruino-discuss3]

Posted at 2016-12-23 by Wilberforce

Sorry, can't offer help here, but would like to know what hardware and software you are using to do this capture?

---

Posted at 2016-12-23 by GeekBot

I use a Saleae logic analyzer. You can purchase one on their website.
It works great.
GeekBot

---

Posted at 2016-12-23 by Wilberforce

Thanks $109 for the logic 4 seems very reasonable. Can the bottom of the range one be used for i2c and onewire?

---

Posted at 2017-01-04 by @gfwilliams

Are you sure you have it connected to the right pins? I just tried this connected to a 2 channel scope on SCK and A7 and it works fine for me with a Pico on 1v90.