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Programming manual for Serene Innovations CA4 2.4 Ghz

Transceiver Module (using nRF24L01+ Transceiver chip):

Operating conditions

Supply voltage: 3 +/-.3 vdc, 30 ma max

Operating Temperature: 0 to 50 ºC

Data and Control Interface

The data and control interface gives you access to all the features in the nRF24L01+. The data and

control interface consists of the following six 5-Volt tolerant digital signals:

• IRQ (this signal is active low and controlled by three maskable interrupt sources)

• CE (this signal is active high and used to activate the chip in RX or TX mode)

• CSN (SPI signal)

• SCK (SPI signal)

• MOSI (SPI signal)

• MISO (SPI signal)

Using 1 byte SPI commands, you can activate the nRF24L01+ data FIFOs or the register map during all

modes of operation.

The SPI is a standard 4-wire SPI (8-bit command) with a maximum data rate of 10Mbps. Every new

command must be started by a high to low transition on CSN. The STATUS register is serially shifted out

on the MISO pin simultaneously to the SPI command word shifting to the MOSI pin. The serial shifting

SPI commands is in the following format: <Command word: MSBit to LSBit (one byte)> <Data bytes:

LSByte to MSByte, MSBit in each byte first>



RXmode

TheRXmodeisanactivemodewherethenRF24L01+radioisusedasareceiver.Toenterthismode,the

nRF24L01+musthavethePWR_UPbit,PRIM_RXbitandtheCEpinsethigh.InRXmodethereceiver

demodulatesthesignalsfromtheRFchannel,constantly

presentingthedemodulateddatatothe

basebandprotocolengine.Thebasebandprotocolengineconstantlysearchesforavalidpacket.Ifa

validpacketisfound(byamatchingaddressandavalidCRC)thepayloadofthepacketispresented

inavacantslotintheRXFIFOs.IftheRX

FIFOsarefull,thereceivedpacketisdiscarded.ThenRF24L01+

remainsinRXmodeuntiltheMCUconfiguresittostandby‐Imodeorpowerdownmode.However,if

theautomaticprotocolfeaturesinthebasebandprotocolengineareenabled,thenRF24L01+canenter

othermodesinordertoexecutetheprotocol.InRXmodeaReceivedPowerDetector(RPD)signalis

available.TheRPDisasignalthatissethighwhenaRFsignalhigherthan‐64dBmisdetectedinsidethe

receivingfrequencychannel.TheinternalRPDsignalisfilteredbeforepresentedtotheRPDregister.The

signalmustbepresentforatleast40μsbeforetheRPDissethigh.



Enhanced

ShockBurst receive payload

Summary of content (4 pages)

PAGE 1
Programming manual for Serene Innovations CA4 2.4 Ghz Transceiver Module (using nRF24L01+ Transceiver chip): Operating conditions Supply voltage: Operating Temperature: 3 +/-.3 vdc, 30 ma max 0 to 50 ºC Data and Control Interface The data and control interface gives you access to all the features in the nRF24L01+.
PAGE 2
1. Select RX by setting the PRIM_RX bit in the CONFIG register to high. All data pipes that receive data must be enabled (EN_RXADDR register), enable auto acknowledgement for all pipes running Enhanced ShockBurst™ (EN_AA register), and set the correct payload widths (RX_PW_Px registers). Set up addresses as described in item 2 in the Enhanced ShockBurst transmitting payload above. 2. Start Active RX mode by setting CE high. 3. After 130μs nRF24L01+ monitors the air for incoming communication. 4.
PAGE 3
16MHz internal clock is started. RF packet is completed (see the packet description). Data is transmitted at high speed (1Mbps or 2Mbps configured by MCU). 5. If auto acknowledgement is activated (ENAA_P0=1) the radio goes into RX mode immediately, unless the NO_ACK bit is set in the received packet. If a valid packet is received in the valid acknowledgement time window, the transmission is considered a success. The TX_DS bit in the STATUS register is set high and the payload is removed from TX FIFO.
PAGE 4
● Caution Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. ● Label and manual requirements for the End Product For an end product using the CA4 there must be a label containing, at least, the following information.