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/*
* PiLC HAT firmware
* I2C configuration interface
*
* Copyright (c) 2016 Michael Buesch <m@bues.ch>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "conf.h"
#include "i2c_slave.h"
#include "util.h"
#include "pb_txen.h"
#include "eepemu_24cxx.h"
#include <string.h>
#include <avr/io.h>
enum conf_items {
CONF_NONE,
CONF_XTALCAL, /* Crystal calibration */
CONF_EEMUWE, /* EEPROM emulation write enable */
CONF_PBTXENDBG, /* TX-en debug mode */
CONF_PBTXENTO, /* TX-en timeout */
};
struct conf_context {
enum conf_items item;
uint8_t count;
uint8_t buf[4];
};
static struct conf_context conf;
static void set_debug(uint8_t mode)
{
enum pb_txen_debugmode m = (enum pb_txen_debugmode)mode;
if (m == PBTXEN_DBG_OFF ||
m == PBTXEN_DBG_RETRIG ||
m == PBTXEN_DBG_NOTRIG)
pb_txen_set_debug(m);
}
static uint8_t get_debug(void)
{
return (uint8_t)pb_txen_get_debug();
}
static void set_osccal(uint8_t osccal)
{
OSCCAL = osccal;
}
static uint8_t get_osccal(void)
{
return OSCCAL;
}
static uint8_t handle_bool_read(bool (*getter)(void))
{
struct conf_context *pc = &conf;
uint8_t ret;
ret = (uint8_t)getter();
pc->item = CONF_NONE;
return ret;
}
static uint8_t handle_u8_read(uint8_t (*getter)(void))
{
struct conf_context *pc = &conf;
uint8_t ret;
ret = getter();
pc->item = CONF_NONE;
return ret;
}
static uint8_t handle_u16_read(uint16_t (*getter)(void))
{
struct conf_context *pc = &conf;
uint16_t value;
uint8_t ret;
build_assert(ARRAY_SIZE(pc->buf) >= 2);
if (pc->count == 0) {
value = getter();
pc->buf[0] = (uint8_t)value;
pc->buf[1] = (uint8_t)(value >> 8);
}
ret = pc->buf[pc->count++];
if (pc->count >= ARRAY_SIZE(pc->buf))
pc->item = CONF_NONE;
return ret;
}
static uint8_t conf_transmit(bool start)
{
struct conf_context *pc = &conf;
uint8_t ret = 0;
if (start)
pc->count = 0;
switch (pc->item) {
case CONF_NONE:
/* error */
break;
case CONF_XTALCAL:
ret = handle_u8_read(get_osccal);
break;
case CONF_EEMUWE:
ret = handle_bool_read(ee24cxx_get_we);
break;
case CONF_PBTXENDBG:
ret = handle_u8_read(get_debug);
break;
case CONF_PBTXENTO:
ret = handle_u16_read(pb_txen_get_timeout);
break;
}
return ret;
}
static void handle_safe_bool_write(uint8_t data, void (*handler)(bool value))
{
struct conf_context *pc = &conf;
uint8_t a, b;
build_assert(ARRAY_SIZE(pc->buf) >= 2);
pc->buf[pc->count++] = data;
if (pc->count >= 2) {
a = pc->buf[0];
b = (uint8_t)~(pc->buf[1]);
if (a == b && (a == 0 || a == 1))
handler(!!a);
pc->item = CONF_NONE;
}
}
static void handle_safe_u8_write(uint8_t data, void (*handler)(uint8_t value))
{
struct conf_context *pc = &conf;
uint8_t a, b;
build_assert(ARRAY_SIZE(pc->buf) >= 2);
pc->buf[pc->count++] = data;
if (pc->count >= 2) {
a = pc->buf[0];
b = (uint8_t)~(pc->buf[1]);
if (a == b)
handler(a);
pc->item = CONF_NONE;
}
}
static void handle_safe_u16_write(uint8_t data, void (*handler)(uint16_t value))
{
struct conf_context *pc = &conf;
uint16_t a, b;
build_assert(ARRAY_SIZE(pc->buf) >= 4);
pc->buf[pc->count++] = data;
if (pc->count >= 4) {
a = (uint16_t)pc->buf[0];
a |= (uint16_t)pc->buf[1] << 8;
b = (uint16_t)pc->buf[2];
b |= (uint16_t)pc->buf[3] << 8;
b = ~b;
if (a == b)
handler(a);
pc->item = CONF_NONE;
}
}
static bool conf_receive(bool start, uint8_t data)
{
struct conf_context *pc = &conf;
if (start) {
pc->item = CONF_NONE;
pc->count = 0;
}
switch (pc->item) {
case CONF_NONE:
pc->item = (enum conf_items)data;
pc->count = 0;
break;
case CONF_XTALCAL:
handle_safe_u8_write(data, set_osccal);
break;
case CONF_EEMUWE:
handle_safe_bool_write(data, ee24cxx_set_we);
break;
case CONF_PBTXENDBG:
handle_safe_u8_write(data, set_debug);
break;
case CONF_PBTXENTO:
handle_safe_u16_write(data, pb_txen_set_timeout);
break;
}
return true;
}
static const struct i2c_slave_ops __flash conf_i2c_slave_ops = {
.transmit = conf_transmit,
.receive = conf_receive,
};
void conf_init(void)
{
memset(&conf, 0, sizeof(conf));
conf.item = CONF_NONE;
i2cs_add_slave(CONF_ADDR, &conf_i2c_slave_ops);
}
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