Register level programming

RE: Register level programming

awneil — Mon, 08 Jun 2020 14:56:03 GMT

It will be somewhere in that repository, or its specified prerequisites.

Have you read the documentation there ?

Sadly, those links are out-of-date.

Why did you choose this particular repository? It really doesn't seem to be suitable for your level of experience.

Again, this is an independent 3rd-part repository - nothing to do with Nordic. If you want support with that code, you need to find some way to contact the author of that code.

RE: Register level programming

Manoj Hiwarkar — Mon, 08 Jun 2020 12:03:26 GMT

Where is GPIO_PIN_CNF_DIR_Output defined ?

RE: Register level programming

awneil — Mon, 08 Jun 2020 08:38:16 GMT

[quote userid="67033" url="~/f/nordic-q-a/62186/register-level-programming/253562"]what is GPIO_PIN_CNF_DIR_Output ?[/quote]

You mean in this:

int main(void)
{
  // Configure GPIO pin as output with standard drive strength.
  NRF_GPIO->PIN_CNF[PIN_GPIO] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) |
                                (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
                                (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
                                (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
                                (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);

[quote userid="67033" url="~/f/nordic-q-a/62186/register-level-programming/253562"]Is this a register name? I don't think so[/quote]

No, it's the name of a bit position within the register.

Again, this is basic stuff - you really need to get a good grounding in these basics before jumping into this!

https://www.avrfreaks.net/forum/tut-c-bit-manipulation-aka-programming-101

www.avrfreaks.net/.../2079906

RE: Register level programming

awneil — Mon, 08 Jun 2020 08:33:41 GMT

Go on - the author is the owner of the Github page.

He is also named in the LICENSE file.

As already noted, he is an independent 3rd party - nothing to do with Nordic.

But all this does assume that you are already familiar with 'C' programming in general, and embedded microcontroller programming in particular.

If (as it seems) that's not the case, I would definitely suggest that this is not the place to start.

RE: Register level programming

Manoj Hiwarkar — Mon, 08 Jun 2020 08:17:39 GMT

Where is this author ?

RE: Register level programming

awneil — Fri, 05 Jun 2020 13:48:13 GMT

where do you see that?

As noted, https://github.com/andenore/NordicSnippets is a 3rd party repository - nothing to do with Nordic - so you will need to go to the author with any questions about it.

RE: Register level programming

Manoj Hiwarkar — Fri, 05 Jun 2020 13:38:49 GMT

what is GPIO_PIN_CNF_DIR_Output ? Is this a register name? I don't think so.

RE: Register level programming

Vidar Berg — Fri, 05 Jun 2020 09:02:48 GMT

It's 3rd-party.

RE: Register level programming

awneil — Fri, 05 Jun 2020 09:00:30 GMT

[quote userid="4240" url="~/f/nordic-q-a/62186/register-level-programming/253454"]The "NordicSnippets" you linked[/quote]

Is that actually a Nordic thing, or just some 3rd-party ?

RE: Register level programming

awneil — Fri, 05 Jun 2020 08:59:48 GMT

exactly the same way that you'd read/write registers on any microcontroller.

If you're not already familiar with register-level programming on microcontrollers, I would strongly suggest that it would be far better to learn that on a "normal" microcontroller than on an nRF52 - with all its added complications.

Note that there are some restrictions on what registers you can directly access when using the SoftDevice (the protocol stack)

RE: Register level programming

Vidar Berg — Fri, 05 Jun 2020 08:49:18 GMT

The "NordicSnippets" you linked to show how registers are accessed directly. One of the simpler examples is the gpio_toggle one which sets a GPIO pin as an output by configuring the bitfields according to the register description here: PIN_CNF[17]

RE: Register level programming

Manoj Hiwarkar — Fri, 05 Jun 2020 07:00:01 GMT

How to read and write the those registers ?

RE: Register level programming

awneil — Thu, 04 Jun 2020 21:47:50 GMT

[quote userid="67033" url="~/f/nordic-q-a/62186/register-level-programming"]Is there any other document[/quote]

The document which contains all the register descriptions and operating details is the Product Specification