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Usage: import machine wdt = machine.WDT(0, 5000) # 5 second timeout wdt.feed() Thanks to Moritz for the initial implementation.
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@@ -138,6 +138,7 @@ SRC_C = \ | |
uart.c \ | ||
can.c \ | ||
usb.c \ | ||
wdt.c \ | ||
gccollect.c \ | ||
pybstdio.c \ | ||
help.c \ | ||
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/* | ||
* 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. | ||
*/ | ||
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#include <stdio.h> | ||
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#include STM32_HAL_H | ||
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#include "py/runtime.h" | ||
#include "wdt.h" | ||
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typedef struct _pyb_wdt_obj_t { | ||
mp_obj_base_t base; | ||
} pyb_wdt_obj_t; | ||
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STATIC pyb_wdt_obj_t pyb_wdt = {{&pyb_wdt_type}}; | ||
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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); | ||
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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)); | ||
} | ||
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// timeout is in milliseconds | ||
mp_int_t timeout = mp_obj_get_int(args[1]); | ||
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// compute prescaler | ||
uint32_t prescaler; | ||
for (prescaler = 0; prescaler < 6 && timeout >= 512; ++prescaler, timeout /= 2) { | ||
} | ||
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// 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; | ||
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// set the reload register | ||
while (IWDG->SR & 2) { | ||
} | ||
IWDG->KR = 0x5555; | ||
IWDG->RLR = timeout; | ||
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// set the prescaler | ||
while (IWDG->SR & 1) { | ||
} | ||
IWDG->KR = 0x5555; | ||
IWDG->PR = prescaler; | ||
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// start the watch dog | ||
IWDG->KR = 0xcccc; | ||
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return (mp_obj_t)&pyb_wdt; | ||
} | ||
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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); | ||
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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 }, | ||
}; | ||
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STATIC MP_DEFINE_CONST_DICT(pyb_wdt_locals_dict, pyb_wdt_locals_dict_table); | ||
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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, | ||
}; |
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@@ -0,0 +1,27 @@ | ||
/* | ||
* 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. | ||
*/ | ||
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extern const mp_obj_type_t pyb_wdt_type; |