Documentation error on DMA channels for I2C4 on STM32F7?

[Sergio Escobedo]

Posted on June 03, 2018 at 22:40

   On STM32F7 reference manual (RM0410, Rev 4), in the DMA stream/channel tables (p.249) there are two possible channel assignation por each I2C flow (TX or RX). For example, you can configure I2C1 to transmit using DMA1 on stream 6 channel 1 or stream 7 channel 1.

   However, on I2C4, according to this table, you have 3 possible channels for RX flow, and just 1 for TX flow. Is this an error in the documentation? I guess both should have to possibilities as the rest of I2C channels and they mistyped a I2C4_RX for a I2C4_TX.

¿If it is an error, what is the real I2C4 channels assignation?

Thanks.

[T J]

Posted on June 04, 2018 at 07:09

DAHMEN.IMEN

‌ who would track these issues ?

[Imen.D]

Posted on June 04, 2018 at 09:23

Hello,

I will check this issue and keep you informed about the taken actions/explanation if needed.

With Regards,

Imen

[Imen.D]

Posted on June 04, 2018 at 14:00

Hello

sescobedo

,

You are right. In the 'Table DMA1 request mapping', the I2C4 _RX on Stream 5 Channel 2 should be I2C4 _TX.

I raised this issue internally for correction in the coming release of the RM0410 reference manual.

Thanks for bringing this typo to our attention.

With Regards,

Imen

[Sergio Escobedo]

Posted on June 07, 2018 at 05:19

Ok, thank you very much

DAHMEN.IMEN

. I needed that information.