Commit 76c366df authored by Damien George's avatar Damien George
Browse files

stmhal: Add machine.WDT class.

Usage:

    import machine
    wdt = machine.WDT(0, 5000) # 5 second timeout
    wdt.feed()

Thanks to Moritz for the initial implementation.
parent f7c46115
......@@ -138,6 +138,7 @@ SRC_C = \
uart.c \
can.c \
usb.c \
wdt.c \
gccollect.c \
pybstdio.c \
help.c \
......
......@@ -44,6 +44,7 @@
#include "rtc.h"
#include "i2c.h"
#include "spi.h"
#include "wdt.h"
// machine.info([dump_alloc_table])
// Print out lots of information about the board.
......@@ -490,10 +491,10 @@ STATIC const mp_map_elem_t machine_module_globals_table[] = {
// initialize master mode on the peripheral.
{ MP_OBJ_NEW_QSTR(MP_QSTR_I2C), (mp_obj_t)&machine_i2c_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_SPI), (mp_obj_t)&pyb_spi_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_WDT), (mp_obj_t)&pyb_wdt_type },
#if 0
{ MP_OBJ_NEW_QSTR(MP_QSTR_UART), (mp_obj_t)&pyb_uart_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_Timer), (mp_obj_t)&pyb_timer_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_WDT), (mp_obj_t)&pyb_wdt_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_HeartBeat), (mp_obj_t)&pyb_heartbeat_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_SD), (mp_obj_t)&pyb_sd_type },
......
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include STM32_HAL_H
#include "py/runtime.h"
#include "wdt.h"
typedef struct _pyb_wdt_obj_t {
mp_obj_base_t base;
} pyb_wdt_obj_t;
STATIC pyb_wdt_obj_t pyb_wdt = {{&pyb_wdt_type}};
STATIC mp_obj_t pyb_wdt_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 2, 2, false);
mp_int_t id = mp_obj_get_int(args[0]);
if (id != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "WDT(%d) does not exist", id));
}
// timeout is in milliseconds
mp_int_t timeout = mp_obj_get_int(args[1]);
// compute prescaler
uint32_t prescaler;
for (prescaler = 0; prescaler < 6 && timeout >= 512; ++prescaler, timeout /= 2) {
}
// convert milliseconds to ticks
timeout *= 8; // 32kHz / 4 = 8 ticks per millisecond (approx)
if (timeout <= 0) {
mp_raise_ValueError("WDT timeout too short");
} else if (timeout > 0xfff) {
mp_raise_ValueError("WDT timeout too long");
}
timeout -= 1;
// set the reload register
while (IWDG->SR & 2) {
}
IWDG->KR = 0x5555;
IWDG->RLR = timeout;
// set the prescaler
while (IWDG->SR & 1) {
}
IWDG->KR = 0x5555;
IWDG->PR = prescaler;
// start the watch dog
IWDG->KR = 0xcccc;
return (mp_obj_t)&pyb_wdt;
}
STATIC mp_obj_t pyb_wdt_feed(mp_obj_t self_in) {
(void)self_in;
IWDG->KR = 0xaaaa;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_wdt_feed_obj, pyb_wdt_feed);
STATIC const mp_map_elem_t pyb_wdt_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_feed), (mp_obj_t)&pyb_wdt_feed_obj },
};
STATIC MP_DEFINE_CONST_DICT(pyb_wdt_locals_dict, pyb_wdt_locals_dict_table);
const mp_obj_type_t pyb_wdt_type = {
{ &mp_type_type },
.name = MP_QSTR_WDT,
.make_new = pyb_wdt_make_new,
.locals_dict = (mp_obj_t)&pyb_wdt_locals_dict,
};
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
extern const mp_obj_type_t pyb_wdt_type;
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