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/* sysmoOCTSIMTEST support for multiplexers
*
* (C) 2021 by Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
*/
#include "board.h"
#include "mux.h"
#include <stdbool.h>
#include <errno.h>
/* 3-bit S0..S2 signal for slot selection */
static const Pin pin_in_sel[3] = {
{ PIO_PA1, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
{ PIO_PA2, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
{ PIO_PA3, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
};
/* 3-bit S0..S2 signal for frequency divider selection */
static const Pin pin_freq_sel[3] = {
{ PIO_PA16, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
{ PIO_PA17, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
{ PIO_PA18, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT },
};
/* low-active output enable for all muxes */
static const Pin pin_oe = { PIO_PA19, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT };
static uint8_t g_mux_slot = 0;
/* initialize the external 1:8 multiplexers */
void mux_init(void)
{
PIO_Configure(&pin_oe, PIO_LISTSIZE(pin_oe));
PIO_Configure(pin_in_sel, PIO_LISTSIZE(pin_in_sel));
PIO_Configure(pin_freq_sel, PIO_LISTSIZE(pin_freq_sel));
mux_set_slot(0);
}
/* set the slot selection mux */
int mux_set_slot(uint8_t s)
{
TRACE_INFO("%s(%u)\r\n", __func__, s);
if (s > 7)
return -EINVAL;
/* !OE = H: disconnect input and output of muxes */
PIO_Set(&pin_oe);
if (s & 1)
PIO_Set(&pin_in_sel[0]);
else
PIO_Clear(&pin_in_sel[0]);
if (s & 2)
PIO_Set(&pin_in_sel[1]);
else
PIO_Clear(&pin_in_sel[1]);
if (s & 4)
PIO_Set(&pin_in_sel[2]);
else
PIO_Clear(&pin_in_sel[2]);
/* !OE = L: (re-)enable the output of muxes */
PIO_Clear(&pin_oe);
g_mux_slot = s;
return s;
}
int mux_get_slot(void)
{
return g_mux_slot;
}
/* set the frequency divider mux */
void mux_set_freq(uint8_t s)
{
TRACE_INFO("%s(%u)\r\n", __func__, s);
/* no need for 'break before make' here, this would also affect
* the SIM card I/O signals which we don't want to disturb */
if (s & 1)
PIO_Set(&pin_freq_sel[0]);
else
PIO_Clear(&pin_freq_sel[0]);
if (s & 2)
PIO_Set(&pin_freq_sel[1]);
else
PIO_Clear(&pin_freq_sel[1]);
if (s & 4)
PIO_Set(&pin_freq_sel[2]);
else
PIO_Clear(&pin_freq_sel[2]);
/* !OE = L: ensure enable the output of muxes */
PIO_Clear(&pin_oe);
}
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