FreeCalypso > hg > fc-magnetite
view cdg3/sap/cci.pdf @ 629:3231dd9b38c1
armio.c: make GPIOs 8 & 13 outputs driving 1 on all "classic" targets
Calypso GPIOs 8 & 13 are pinmuxed with MCUEN1 & MCUEN2, respectively,
and on powerup these pins are MCUEN, i.e., outputs driving 1. TI's code
for C-Sample and earlier turns them into GPIOs configured as outputs also
driving 1 - so far, so good - but TI's code for BOARD 41 (which covers
D-Sample, Leonardo and all real world Calypso devices derived from the
latter) switches them from MCUEN to GPIOs, but then leaves them as inputs.
Given that the hardware powerup state of these two pins is outputs driving 1,
every Calypso board design MUST be compatible with such driving; typically
these GPIO signals will be either unused and unconnected or connected as
outputs driving some peripheral. Turning these pins into GPIO inputs will
result in floating inputs on every reasonably-wired board, thus I am
convinced that this configuration is nothing but a bug on the part of
whoever wrote this code at TI.
This floating input bug had already been fixed earlier for GTA modem and
FCDEV3B targets; the present change makes the fix unconditional for all
"classic" targets. The newly affected targets are D-Sample, Leonardo,
Tango and GTM900.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 02 Jan 2020 05:38:26 +0000 |
parents | c15047b3d00d |
children |
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;******************************************************************************** ;*** File : cci.pdf ;*** Creation : Wed Mar 11 09:57:44 CST 2009 ;*** XSLT Processor : Apache Software Foundation / http://xml.apache.org/xalan-j / supports XSLT-Ver: 1 ;*** Copyright : (c) Texas Instruments AG, Berlin Germany 2002 ;******************************************************************************** ;*** Document Type : Service Access Point Specification ;*** Document Name : cci ;*** Document No. : 8441.118.00.017 ;*** Document Date : 2003-01-13 ;*** Document Status: BEING_PROCESSED ;*** Document Author: UT ;******************************************************************************** PRAGMA SRC_FILE_TIME "Thu Nov 29 09:37:42 2007" PRAGMA LAST_MODIFIED "2003-01-13" PRAGMA ID_AND_VERSION "8441.118.00.017" VALTAB VAL_algo_type VAL 0 CCI_ALGO_V42 "V42bis algorithm" VALTAB VAL_comp_inst VAL 0 CCI_COMP_INST_V42_0 "first instance for V42bis" VAR algo_type "algorithm type" B VAL @p_cci - VAL_algo_type@ VAR comp_inst "compressor instance" B VAL @p_cci - VAL_comp_inst@ ; CCI_INIT_REQ 0x3604 PRIM CCI_INIT_REQ 0x3604 { algo_type ; algorithm type comp_inst ; compressor instance }