i.MX ProcessorsのトピックRe: SAI transmit FIFO pointers

SAI transmit FIFO pointers

linasstaisiunas — Thu, 27 Apr 2017 13:13:10 GMT

I am handling SAI audio interface on imx6. There is a SAI Transmit FIFO reg (TFR) with WFP and RFP pointers for transmit data channel. At what condition WFP and RFP pointers are reset to 0?

In the reference manual WFP is incremented after each valid write to TDR. Does the WFP is incremented until max value 2^6?

Br,

Linas

Re: SAI transmit FIFO pointers

igorpadykov — Thu, 27 Apr 2017 23:11:20 GMT

Hi Linas

please refer to sect.42.3.2.2 FIFO reset i.MX6UL and description

of register RMI2Sx_TCSR[FR] FIFO Reset.

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6ULRM.pdf

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: SAI transmit FIFO pointers

linasstaisiunas — Tue, 02 May 2017 12:52:02 GMT

I understand what is written in the sect.42.3.2.2. But I am interested in I2Sx_TFRn and I2Sx_RFRn registers which store read/write pointers. Is it possible to calculate fill level of transmit and receive buffers using these pointer values?

Re: SAI transmit FIFO pointers

igorpadykov — Tue, 02 May 2017 23:40:31 GMT

please refer to sect.42.3.5.2 FIFO pointers

>Is it possible to calculate fill level of transmit and receive buffers using these pointer values?

I am afraid no

Best regards
igor