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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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NRF24L01P-R7 Datenblatt(PDF) 48 Page - Nordic Semiconductor |
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NRF24L01P-R7 Datenblatt(HTML) 48 Page - Nordic Semiconductor |
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48 / 78 page  Revision 1.0 Page 48 of 78 nRF24L01+ Product Specification 7.8.6 Two transactions with ACK payload packet and the first ACK packet lost Figure 23. TX/RX cycles with ACK Payload and the according interrupts when the ACK packet fails In Figure 23. the ACK packet is lost and a retransmission is needed before the TX_DS IRQ is asserted, but the RX_DR IRQ is asserted immediately. The retransmission of the packet (PID=1) results in a discarded packet. For the PTX both the TX_DS and RX_DR IRQ are asserted after the second transmission of ACK, which is received. After the second packet (PID=2) is received on the PRX both the RX_DR (PID=2) and TX_DS (ACK1PAY) IRQ is asserted. The callouts explains the different events and interrupts. 7.8.7 Two transactions where max retransmissions is reached Figure 24. TX/RX cycles with ACK Payload and the according interrupts when the transmission fails. ARC is set to 2. MAX_RT IRQ is asserted if the auto retransmit counter (ARC_CNT) exceeds the programmed maximum limit (ARC). In Figure 24. the packet transmission ends with a MAX_RT IRQ. The payload in TX FIFO is NOT removed and the MCU decides the next step in the protocol. A toggle of the CE starts a new transmitting sequence of the same packet. The payload can be removed from the TX FIFO using the FLUSH_TX com- mand. TX:PID=1 RX PTX PRX RX MCU PRX UL1 MCU PTX 130us1 TX:PID=1 RX ARD 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) RX DR (ACK1PAY) RX ACK1 PAY TX:PID=2 RX UL2 ACK1 PAY Packet received. IRQ: RX DR (PID=2) TX DS (ACK1PAY) Auto retransmit delay elapsed 130us1 130us1 DL UL1 2 DL IRQ DL IRQ UL2 2 RX ACK received IRQ: TX DS (PID=2) RX DR (ACK2PAY) ACK2 PAY 130us1 TX:PID=3 RX Packet received. IRQ: RX DR (PID=3) TX DS (ACK2PAY) UL3 ≥130us3 ≥130us3 Packet detected as copy of previous, discarded 1 Radio Turn Around Delay 2 Uploading Payload for Ack Packet 3 Delay defined by MCU on PTX side, ≥ 130us TX:PID=1 RX PTX PRX RX MCU PRX UL MCU PTX 130us1 ARD 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) RX ACK1 PAY Auto retransmit delay elapsed 130us1 130us1 DL UL2 IRQ ≥130us3 RX No address detected. RX off to save current TX:PID=1 TX:PID=1 RX 130us1 ARD ACK PID=1 lost during transmission ACK1 PAY No address detected. RX off to save current. IRQ:MAX_RT reached 130us1 RX ACK PID=1 lost during transmission Packet detected as copy of previous, discarded 1 Radio Turn Around Delay 2 Uploading Paylod for Ack Packet 3 Delay defined by MCU on PTX side, ≥ 130us |
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