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NRF24L01P-R7 データシート(PDF) 46 Page - Nordic Semiconductor

部品番号 NRF24L01P-R7
部品情報  Single Chip 2.4GHz Transceiver
PDF  78 Pages
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メーカー  NORDIC [Nordic Semiconductor]
ホームページ  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF24L01P-R7 データシート(HTML) 46 Page - Nordic Semiconductor

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Revision 1.0
Page 46 of 78
nRF24L01+ Product Specification
7.8.2
Single transaction with a lost packet
Figure 19. is a scenario where a retransmission is needed due to loss of the first packet transmit. After the
packet is transmitted, the PTX enters RX mode to receive the ACK packet. After the first transmission, the
PTX waits a specified time for the ACK packet, if it is not in the specific time slot the PTX retransmits the
packet as shown in Figure 19.
Figure 19. TX/RX cycles with ACK and the according interrupts when the first packet transmit fails
When an address is detected the PTX stays in RX mode until the packet is received. When the retransmit-
ted packet is received by the PRX (see Figure 19.), the RX_DR IRQ is asserted and an ACK is transmitted
back to the PTX. When the ACK is received by the PTX, the TX_DS IRQ is asserted.
7.8.3
Single transaction with a lost ACK packet
Figure 20. is a scenario where a retransmission is needed after a loss of the ACK packet. The correspond-
ing interrupts are also indicated.
Figure 20. TX/RX cycles with ACK and the according interrupts when the ACK packet fails
TX:PID=1
RX
PTX
PRX
RX
ACK:PID=1
DL
MCU PRX
UL
MCU PTX
130us1
TX:PID=1
RX
IRQ
ARD
Auto retransmit delay
elapsed
No address detected.
RX off to save current
Retransmit of packet
PID=1
Packet PID=1 lost
during transmission
Packet received.
IRQ: RX DR (PID=1)
ACK received
IRQ: TX DS (PID=1)
130us1
130us1
1 Radio Turn Around Delay
TX:PID=1
RX
PTX
PRX
RX
ACK:PID=1
DL
MCU PRX
UL
MCU PTX
130us1
TX:PID=1
RX
IRQ
ARD
Auto retransmit delay
elapsed
No address detected.
RX off to save current
Retransmit of packet
PID=1
ACK PID=1 lost
during transmission
Packet received.
IRQ: RX DR (PID=1)
ACK received
IRQ: TX DS (PID=1)
ACK:PID=1
RX
Packet detected as
copy of previous,
discarded
130us1
130us1
1 Radio Turn Around Delay



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