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Technical Notes using Analog Devices' components development tools
Copyright 2000, Analog Devices, Inc. rights reserved. Analog Devices assumes responsibility customer product design application customers' products infringements patents rights others which result from Analog Devices assistance. trademarks logos property their respective holders. Information furnished Analog Devices Applications Development Tools Engineers believed accurate reliable, however responsibility assumed Analog Devices regarding technical accuracy content provided Analog Devices' Engineer-to-Engineer Notes.
ADSP-2106x: Using SPORTs additional timers
March 2000 (bk) ADSP-21060/2/1 devices feature single timer. timer might enough most typical signal processing applications, even them. additional timers required, unused SPORT channels used realize them.
enable SPORT1 receive interrupt IMASK SPR1I; 0x2000 cycles 0x1FFF0000; dm(RDIV1) enable, bit, RCLK internal, early 0x00006431; dm(SRCTL1)
Initialization timer operation initialization sequence transmit channel differs only DITFS data independent transmission:
setup_tx1: global interrupt enable MODE1 IRPTEN; enable transmit interrupt IMASK SPR1I; 0x2000 cycles 0x1FFF0000; dm(TDIV1) enable, bit, RCLK internal, early 0x0000E431; DITFS dm(STCTL1)
does work?
SHARC features serial port devices. Since transmit receive units both ports have separate independent rate generators interrupt logic, four additional timers realized. 16-Bit registers, xCLKDIV xFSDIV control timer period. following equation used calculate interrupt rate fCLKIN (xCLKDIV xFSDIV
Please note, xFSDIV shouldn't less than SLEN which controls serial word length (=SLEN+1) from bits. fCLKIN 50MHz maximum timer period without operation around seconds. following example code demonstrates initialization receive channel SPORT1:
setup_rx1: global interrupt enable MODE1 IRPTEN;
Initialization timer operation course, serial ports have been designed inter-chip communication. Once enabled, SPORTs will activate dedicated pins. avoid need external glue SPORTs should programmed fully internal operation. Then, pins except work output. internal pull-up left open, too. frame sync signals indicate timer overrun. LxFS controls signal polarity, wheras pulse width depend LAFS, SLEN xCLKDIV.

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