FIFO_R_W

Question

FIFO_R_W

Beldian opened this issue 3 years ago · 4 comments

Hey!

When you read from the FIFO_R_W register 12 bites, you actually read EXT_SENS registers? If I understand correcty, there is a connection between them.

Answer 1 · 2021-03-22T23:37:26.000Z

On Mon, Mar 22, 2021 at 4:26 PM Beldian ***@***.***> wrote: Hey! When you read from the FIFO_R_W register 12 bites, you actually read EXT_SENS registers? If I understand correcty, there is a connection between them. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#457>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKXRXHHQZBB6N72OUCDTE7G4DANCNFSM4ZUCC62A> .

not sure what you are asking here?

Answer 2 · 2021-03-23T20:13:56.000Z

So in MPU9250.h headerfile at line 498 there is this:

"readBytes(MPU9250_ADDRESS, FIFO_R_W, 12, &data[0]);"

What is this? It says you read 12 bites from FIFO_R_W register. I would like to ask, what that makes sense.
I know that, for example when you read 6 bites from ACCEL_XOUT_H, this is auto increment and you'll get all the ACCEL data.
But FIFO_R_W is not auto increment. So I am in doubt, why did you do that. Could you answer?

Answer 3 · 2021-03-23T20:29:33.000Z

The FIFO_R_W is the register from which FIFO values are read per the data sheet/register map. In a sense, this is auto-incrementing, but better to think of FIFO_R_W as an array 512 bytes deep that can be filled with data bytes and read back like an array. Again, read the data sheet and register map. What is it that you don't understand?

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On Tue, Mar 23, 2021 at 1:14 PM Beldian ***@***.***> wrote: So in MPU9250.h headerfile at line 498 there is this: "readBytes(MPU9250_ADDRESS, FIFO_R_W, 12, &data[0]);" What is this? It says you read 12 bites from FIFO_R_W register. I would like to ask, what that makes sense. I know that, for example when you read 6 bites from ACCEL_XOUT_H, this is auto increment and you'll get all the ACCEL data. But FIFO_R_W is not auto increment. So I am in doubt, why did you do that. Could you answer? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#457 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKSZ7BZSYFZQDKEFV4DTFDZBLANCNFSM4ZUCC62A> .

Answer 4 · 2021-03-23T20:42:23.000Z

I think I understood that. Thank you so much!