 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
BK2425WD датащи(PDF) 10 Page - List of Unclassifed Manufacturers |
|
|
|||||||||||||||||||||||||||||
BK2425WD датащи(HTML) 10 Page - List of Unclassifed Manufacturers |
|
|
10 / 30 page  BK2425 Revision 1.0 Proprietary and Confidential Page 10 of 30 EN_DYN_ACK bit. When you use this option, the PTX goes directly to standby-I mode after transmitting the packet and the PRX does not transmit an ACK packet when it receives the packet. 5.1.4 Payload The payload is the user defined content of the packet. It can be 0 to 32 bytes wide, and it is transmitted on-air as it is uploaded (unmodified) to the device. The BK2425 provides two alternatives for handling payload lengths, static and dynamic payload length. The static payload length of each of six data pipes can be individually set. The default alternative is static payload length. With static payload length all packets between a transmitter and a receiver have the same length. Static payload length is set by the RX_PW_Px registers. The payload length on the transmitter side is set by the number of bytes clocked into the TX_FIFO and must equal the value in the RX_PW_Px register on the receiver side. Each pipe has its own payload length. Dynamic Payload Length (DPL) is an alternative to static payload length. DPL enables the transmitter to send packets with variable payload length to the receiver. This means for a system with different payload lengths it is not necessary to scale the packet length to the longest payload. With DPL feature the BK2425 can decode the payload length of the received packet automatically instead of using the RX_PW_Px registers. The MCU can read the length of the received payload by using the command: R_RX_PL_WID. In order to enable DPL the EN_DPL bit in the FEATURE register must be set. In RX mode the DYNPD register has to be set. A PTX that transmits to a PRX with DPL enabled must have the DPL_P0 bit in DYNPD set. 5.1.5 CRC The CRC is the error detection mechanism in the packet. The number of bytes in the CRC is set by the CRCO bit in the CONFIG register. It may be either 1 or 2 bytes and is calculated over the address, Packet Control Field, and Payload. The polynomial for 1 byte CRC is X 8 + X2 + X + 1. Initial value is 0xFF. The polynomial for 2 byte CRC is X 16 + X12 + X 5 + 1. Initial value is 0xFFFF. No packet is accepted by receiver side if the CRC fails. 5.2 Packet Handling BK2425 uses burst mode for payload transmission and receive. The transmitter fetches payload from TX FIFO, automatically assembles it into packet and transmits the packet in a very short burst period with 1Mbps or 2Mbps air data rate. After transmission, if the PTX packet has the NO_ACK flag set, BK2425 sets TX_DS and gives an active low interrupt IRQ to MCU. If the PTX is ACK packet, the PTX needs receive ACK from the PRX and then asserts the TX_DS IRQ. The receiver automatically validates and disassembles received packet, if there is a valid packet within the new payload, it will write the payload into RX FIFO, set RX_DR and give an active low interrupt IRQ to MCU. When auto acknowledge is enabled (EN_AA=1), the PTX device will automatically wait for acknowledge packet after transmission, and re-transmit original packet with the delay of ARD until an acknowledge packet is received or the number of re-transmission exceeds a threshold ARC. If the later one happens, BK2425 will set MAX_RT and give an active low interrupt |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
