nrf9160 I2C only sending out 1 byte

RE: nrf9160 I2C only sending out 1 byte

Aditya_s — Sat, 18 Jul 2020 06:54:22 GMT

Hello stevenminnick,

Do you mean to say that you got a different i2c device that served the same purpose as the previous one and it worked fine?

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Tue, 23 Jul 2019 18:15:48 GMT

If anyone was following along. It was the target i2c device. So when you send out an i2c read, you send out an device address byte and then a memory address byte. And then clock out for a response. Well my i2c device I was trying to connect to wasn't operating properly, so when I sent out the device address byte, there was nothing listening so there was no ack to that address byte. I got a different i2c device and hooked it up and it sent out both bytes. I assumed it was something on the Nordic side, but it appears it was on the "thing the Nordic was connected to" side.

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Mon, 01 Jul 2019 14:04:04 GMT

Did you run west update?

In SES, if you go to Tools -> Options -> nRF Connect, is Zephyr Base pointing to the correct location?

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Fri, 28 Jun 2019 12:30:24 GMT

nrf9160_pca10090ns

nrfjprog --eraseall -f nrf91

SES

Tried both 0.4.0 and bleeding edge, both had the same results.

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Fri, 28 Jun 2019 11:21:22 GMT

Did you build for nrf9160_pca10090 OR nrf9160_pca10090ns ?

Are you using command-line with west tool, or SES ?

Try doing a nrfjprog -e , before flashing the application.

[quote userid="76103" url="~/f/nordic-q-a/48999/nrf9160-i2c-only-sending-out-1-byte/195123"]I also tried upgrading to the latest bleeding edge. [/quote]

Master branch is not stable, I recommend staying on v0.4.0 tag until v1.0.0 is released.

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Thu, 27 Jun 2019 11:48:16 GMT

Sorry, I misunderstood. I thought you were talking about a sensor tag? (like a TI Sensor Tag, and then I assumed you were talking about the "thingy" devices from Nordic). Not sure why I did that.

Yes, GIT 0.4.0 tag. I also tried upgrading to the latest bleeding edge.

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Thu, 27 Jun 2019 11:40:25 GMT

Is that your local branch of the nrf repo? The latest stable release is v0.4.0, but note that v1.0.0 will be released in the near future.

RE: nrf9160 I2C only sending out 1 byte

DevinCallahan — Wed, 26 Jun 2019 22:04:01 GMT

Maybe check that the I2C device address you are using doesn't have the Write/Read bit included. I lost some time trying to figure out why the I2C device wasn't acking because the W/R bit is set by the peripheral and shouldn't be included in the device address parameter.

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Wed, 26 Jun 2019 17:05:02 GMT

nrf9160, so that's probably the issue. It's not a tag.

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Wed, 26 Jun 2019 17:00:12 GMT

What tag are you on ? Is this v0.4.0 tag ?

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Wed, 26 Jun 2019 14:27:06 GMT

When I open your project you linked here, and just compile it, it fails because it can't find math.h, but it seems like you don't use it, so I commented it out. But then when I run it, it also fails.

Exception occurred in Secure State
***** HARD FAULT *****
Fault escalation (see below)
***** BUS FAULT *****
Precise data bus error
BFAR Address: 0x50008120
***** Hardware exception *****
Current thread ID = 0x20020184
Faulting instruction address = 0x0
Fatal fault in ISR! Spinning...

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Wed, 26 Jun 2019 13:56:27 GMT

prj.conf

CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_I2C_3=y
CONFIG_I2C_3_NRF_TWIM=y

overlay

&i2c3 {
status = "ok";
sda-pin = < 30 >;
scl-pin = < 31 >;
clock-frequency = <I2C_BITRATE_STANDARD>;
};

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Wed, 26 Jun 2019 13:53:48 GMT

Do you have this in prj.conf ?

CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_I2C_3=y
CONFIG_I2C_3_NRF_TWIM=y

and this in nrf9160_pca10090.overlay / nrf9160_pca10090ns.overlay ?

&i2c3 {
status = "ok";
sda-pin = < 12 >;
scl-pin = < 11 >;
clock-frequency = <I2C_BITRATE_STANDARD>;
};

RE: nrf9160 I2C only sending out 1 byte

stevenminnick — Wed, 26 Jun 2019 13:40:48 GMT

When I try using I2C_3 it won't build. I'm investigating.

RE: nrf9160 I2C only sending out 1 byte

Sigurd — Wed, 26 Jun 2019 11:44:47 GMT

Hi,

Could you try with I2C_3 instead? I have a I2C scanner sample for nRF9160 you might find useful here: https://github.com/sigurdnev/fw-nrfconnect-nrf/blob/master/samples/nrf9160/i2c_scanner/src/main.c