FreeCalypso > hg > freecalypso-tools

comparison doc/RVTMUX @ 430:06442f27b144

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc/RVTMUX: added note at the beginning about paradigm changes
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 04 Nov 2018 01:55:35 +0000
parents 05dc91d011a6
children
comparison
equal deleted inserted replaced
429:05dc91d011a6 430:06442f27b144
1 [Historical note: this document was originally written in 2014 when the vision
2 of FreeCalypso was very different from what it is today. Since then we have
3 transitioned from making aftermarket hacks on pre-existing Calypso phones and
4 modems to producing and supporting our own FreeCalypso hardware products, and
5 our firmware work has changed from a nebulous dream to stable production code.
6 The ways in which we approach various technical aspects have changed
7 accordingly, but much of our documentation has been slow to catch up. The
8 documentation is now being updated, but there may still be some passages where
9 the old world view shines through.]
10
1 TI's Calypso GSM/GPRS baseband processor chip has not one but two UART serial 11 TI's Calypso GSM/GPRS baseband processor chip has not one but two UART serial
2 ports, called "MODEM" and "IrDA" in the hardware documentation. In hardware 12 ports, called "MODEM" and "IrDA" in the hardware documentation. In hardware
3 terms, both support basic data-leads-only UART operation at a fixed baud rate, 13 terms, both support basic data-leads-only UART operation at a fixed baud rate,
4 but their extended capabilities differ: the IrDA UART adds IrDA capability (no 14 but their extended capabilities differ: the IrDA UART adds IrDA capability (no
5 surprise), whereas the MODEM UART adds hardware flow control and autobaud. If 15 surprise), whereas the MODEM UART adds hardware flow control and autobaud. If