Inter-integrated circuit (I
2
C) interface RM0090
725/1422 Doc ID 018909 Rev 4
Reception using DMA
DMA mode can be enabled for reception by setting the DMAEN bit in the I2C_CR2 register.
Data will be loaded from the I2C_DR register to a Memory area configured using the DMA
peripheral (refer to the DMA specification) whenever a data byte is received. To map a DMA
channel for I
2
C reception, perform the following sequence. Here x is the channel number.
1. Set the I2C_DR register address in DMA_CPARx
register. The data will be moved from
this address to the memory after each RxNE event.
2. Set the memory address in the DMA_CMARx register. The data will be loaded from the
I2C_DR register to this memory area after each RxNE event.
3. Configure the total number of bytes to be transferred in the DMA_CNDTRx register.
After each RxNE event, this value will be decremented.
4. Configure the channel priority using the PL[0:1] bits in the DMA_CCRx register
5. Reset the DIR bit and configure interrupts in the DMA_CCRx register after half transfer
or full transfer depending on application requirements.
6. Activate the channel by setting the EN bit in the DMA_CCRx register.
When the number of data transfers which has been programmed in the DMA Controller
registers is reached, the DMA controller sends an End of Transfer EOT/ EOT_1 signal to the
I
2
C interface and DMA generates an interrupt, if enabled, on the DMA channel interrupt
vector.
Note: Do not enable the ITBUFEN bit in the I2C_CR2 register if DMA is used for reception.
25.3.9 Packet error checking
A PEC calculator has been implemented to improve the reliability of communication. The
PEC is calculated by using the C(x) = x
8
+ x
2
+ x + 1 CRC-8 polynomial serially on each bit.
● PEC calculation is enabled by setting the ENPEC bit in the I2C_CR1 register. PEC is a
CRC-8 calculated on all message bytes including addresses and R/W bits.
– In transmission: set the PEC transfer bit in the I2C_CR1 register after the TxE
event corresponding to the last byte. The PEC will be transferred after the last
transmitted byte.
– In reception: set the PEC bit in the I2C_CR1 register after the RxNE event
corresponding to the last byte so that the receiver sends a NACK if the next
received byte is not equal to the internally calculated PEC. In case of Master-
Receiver, a NACK must follow the PEC whatever the check result. The PEC must
be set before the ACK of the CRC reception in slave mode. It must be set when
the ACK is set low in master mode.
● A PECERR error flag/interrupt is also available in the I2C_SR1 register.
● If DMA and PEC calculation are both enabled:-
– In transmission: when the I
2
C interface receives an EOT signal from the DMA
controller, it automatically sends a PEC after the last byte.
– In reception: when the I
2
C interface receives an EOT_1 signal from the DMA
controller, it will automatically consider the next byte as a PEC and will check it. A
DMA request is generated after PEC reception.
● To allow intermediate PEC transfers, a control bit is available in the I2C_CR2 register
(LAST bit) to determine if it is really the last DMA transfer or not. If it is the last DMA
request for a master receiver, a NACK is automatically sent after the last received byte.
● PEC calculation is corrupted by an arbitration loss.
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