Disabling The Sai; Table 180. Interrupt Sources - ST STM32F423 Reference Manual

RM0430
Interrupt
source
FREQ
OVRUDR ERROR
AFSDET
LFSDET
CNRDY
MUTEDE
T
WCKCFG ERROR
Below are the SAI configuration steps to follow when an interrupt occurs:
1. Disable SAI interrupt.
2. Configure SAI.
3. Configure SAI interrupt source.
4. Enable SAI.
30.15

Disabling the SAI

The audio block in the SAI can be disabled at any moment by clearing bit SAIxEN in the
SAI_xCR1 register. All the frames that have already started will be automatically completed
before the total extinction of the SAI. Bit SAIxEN in the SAI_xCR1 register will stay high until
the SAI is completely switched-off at the end of the current audio frame transfer.
If there is an audio block in the SAI synchronous with the other one, the one which is the
master must be disabled first.

Table 180. Interrupt sources

Interru
pt Audio block mode
group
Master or Slave
FREQ
Receiver or transmitter
Master or Slave
Receiver or transmitter
Slave
ERROR
(Not used in AC'97
mode)
Slave
ERROR
(Not used in AC'97
mode)
Slave
ERROR
(Only in AC'97 mode)
Master or slave
MUTE
Receiver mode only
Master with NODIV = 0
in the SAI_xCR1
register
RM0430 Rev 8
Serial audio interface (SAI)
Interrupt enable
Depend on:
- FIFO threshold setting
(FLTH bits in SAI_CR2)
FREQIE in
- Communication direction
SAI_xIM register
transmitter or receiver
for more details please refer
to Internal FIFOs section
OVRUDRIE in COVRUDR = 1 in
SAI_xIM register SAI_xCLRFR register
AFSDETIE in CAFSDET = 1 in
SAI_xIM register SAI_xCLRFR register
LFSDETIE in CLFSDET = 1 in
SAI_xIM register SAI_xCLRFR register
CNRDYIE in CCNRDY = 1 in
SAI_xIM register SAI_xCLRFR register
MUTEDETIE in CMUTEDET = 1 in
SAI_xIM register SAI_xCLRFR register
WCKCFGIE in CWCKCFG = 1 in
SAI_xIM register SAI_xCLRFR register
Interrupt clear
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