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Serial peripheral interface (SPI)
RM0008
4.
5.
If needed, select all the potential interruption sources and the DMA capabilities by
writing the SPI_CR2 register.
The I2SE bit in SPI_I2SCFGR register must be set.
WS and CK are configured in output mode. MCK is also an output, if the MCKOE bit in
SPI_I2SPR is set.
Transmission sequence
The transmission sequence begins when a half-word is written into the Tx buffer.
Assumedly, the first data written into the Tx buffer correspond to the channel Left data.
When data are transferred from the Tx buffer to the shift register, TXE is set and data
corresponding to the channel Right have to be written into the Tx buffer. The CHSIDE flag
indicates which channel is to be transmitted. It has a meaning when the TXE flag is set
because the CHSIDE flag is updated when TXE goes high.
A full frame has to be considered as a Left channel data transmission followed by a Right
channel data transmission. It is not possible to have a partial frame where only the left
channel is sent.
The data half-word is parallel loaded into the 16-bit shift register during the first bit
transmission, and then shifted out, serially, to the MOSI/SD pin, MSB first. The TXE flag is
set after each transfer from the Tx buffer to the shift register and an interrupt is generated if
the TXEIE bit in the SPI_CR2 register is set.
For more details about the write operations depending on the I 2 S standard mode selected,
refer to Section 23.4.2: Supported audio protocols ).
To ensure a continuous audio data transmission, it is mandatory to write the SPI_DR with
the next data to transmit before the end of the current transmission.
To switch off the I 2 S, by clearing I2SE, it is mandatory to wait for TXE = 0 and BSY = 0.
Reception sequence
The operating mode is the same as for the transmission mode except for the point 3, where
the configuration should set the master reception mode through the I2SCFG[1:0] bits.
Whatever the data or channel length, the audio data are received by 16-bit packets. This
means that each time the Rx buffer is full, the RXNE flag is set and an interrupt is generated
if the RXNEIE bit is set in SPI_CR2 register. Depending on the data and channel length
configuration, the audio value received for a right or left channel may result from one or two
receptions into the Rx buffer.
Clearing the RXNE bit is performed by reading the SPI_DR register.
CHSIDE is updated after each reception. It is sensitive to the WS signal generated by the
I 2 S cell.
For more details about the read operations depending on the I 2 S standard mode selected,
refer to Section 23.4.2: Supported audio protocols .
If data are received while the precedent received data have not been read yet, an overrun is
generated and the OVR flag is set. If the ERRIE bit is set in the SPI_CR2 register, an
interrupt is generated to indicate the error.
610/995
Doc ID 13902 Rev 9
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