USR-WIFI232-G2 SPI Interface User Manual V1.0 Product Features
Contents
1. x BABE USR WIFI232 G2 SPI Interface User Manual V1 0 Product Features Support UART SPI two communication interface user can freely choose according to demand UART communication mode please refer to USR WIFI232 Low Power WiFi Module User Manual V2 1 SPI communication please refer to this documentation Page of 3 Jinan USR IOT Technology Limited tec usr cn OT BAR fan Usr cn 1 Function Description The USR WIFI232 G2 module supports SPI data communication mode the module connect with SPI device via 5 pin using interrupt trigger level to support different clock USR WIFI232 G2 SPI Interface User Manual polarity and phase four transmission modes up to 6MHz rate 1 1 Hardware connect In SPI communication mode the module operates in master mode the connection circuit as following Master MOSI MISO OF CLK O cS Ol INTRI WIFI232 G2 Module SPI pins description Slave O INTR_O SPI pins WIFI232 G2 Function description Module pin index MOSI SPI data out pin MISO SPI data in pin CLK SPI clock signal pin INTR_I Pin 23 Jinan USR IOT Technology Limited SPI interrupt input pin if the data needs to be sent from the slave device to the master device the Slave device need to sends an interrupt to the master device through the INTR pin Low effective Master device read data from slave device when INTR pin is low and stop read data when INTR pin is high Pag2. e 2 of 3 http en usr cn a BARBER 1 2 SPI Function Switch Method Description Use AT command AT SPIEN on to open SPI mode use AT SPIP set parameters e AT SPIEN set SPI mode restart to effect UART will automatic close e AT SPIP set SPI parameters master mode transmission mode clock frequency AT SPIP lt ms mode frequency gt lt CR gt ok lt CR gt lt LF gt lt CR gt lt LF gt Parameters ms m means master mode transmission mode support 0 1 2 3 frequency clock frequency Support 6MHz 3MHz 1 5MHz 750KHz 350KHz Transmission mode corresponding clock polarity CPOL and clock phase CPHA in the following table SPI Bus Protocol CPOL CPHA Mode es ee ee eee rE ee ee ee eee eee 1 3 SPI Function Using Introduction 1 SPI data sending module gt slave device When module sends data to slave device INTR_I pin need to be a high level and the module will set CS pin low level While transmitting the MSB is first 2 SPI data receiving slave device gt module When slave device sends data to the module need to write data to the SPI buffer then set INTR_I pin low level until the data is read by module and then set INTR_I pin high level Note While reading data module don t set CS pin low level Jinan USR IOT Technology Limited Paes eee tec usr cn
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