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EZ-HOST /EZ-OTG Peripheral Mode firmware flow Model

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EZ-HOST /EZ-OTG Peripheral Mode firmware flow Model

Question: In peripheral mode of EZ-HOST/EZ-OTG What is the relation between firmware frameworks(/common) and top-level firmware folders like Simple Examples(se1-se10) and Design Examples(de1-de10)?



Response: The EZ-HOST and EZ-OTG are Full speed  Embedded Hosts. They  have  2 SIE(Serial-Interface-Engines) -SIE1,SIE2.Each of the SIE can function as either Peripheral/Host mode. After installing the the CY3663 DVK software available from cypress Website the sample firmware examples  included in the kit under C:\Cypress\USB\OTG- Host\Source\stand-alone

For Peripheral Mode functionality : In the list of simple Examples(se1-se10)  the example  se3  is relevant to peripheral mode.

Among Design Examples(de1-de4)  the Dual Slave (de2) example is also relevant to peripheral mode.

All  these  examples  rely on a single  /common directory termed as  frameworks.This directory contains low level C HAL (Hardware-Abstraction-Layer)functions to interact with  most of the interfaces inside EZ-HOST/EZ-OTG like  USB peripheral,Host ,OTG  ,UART, CPLD,SSD,Push buttons,HPI,SPI and HSS..etc.

The  C functions inside se3 or de2  invoke  the low-level functions across several .C  files in the /common directory to enumerate as a peripheral device. After  downloading the peripheral mode  binaries to either RAM or EEPROM connected to EZ-HOST/EZ-OTG the processor control shifts from the BIOS to start of the downloaded image.Once the processor starts execution of the downloaded firmware nitially it calls several low level C functions in the frameworks and then execution jumps to top-level API's in the se3/de2 folder.Attached PDF contains the systematic flow  of function calls between functions inside Frameworks( /common)and top-level-firmware  folders(se3,de2) once the execution starts from the main() function.

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‎May 10, 2011 01:33 AM
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