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a03e6c1e05
micropython/ports/stm32/extint.c
Damien George a03e6c1e05 stm32/irq: Define IRQ priorities directly as encoded hardware values. 
For a given IRQn (eg UART) there's no need to carry around both a PRI and
SUBPRI value (eg IRQ_PRI_UART, IRQ_SUBPRI_UART).  Instead, the IRQ_PRI_UART
value has been changed in this patch to be the encoded hardware value,
using NVIC_EncodePriority.  This way the NVIC_SetPriority function can be
used directly, instead of going through HAL_NVIC_SetPriority which must do
extra processing to encode the PRI+SUBPRI.

For a priority grouping of 4 (4 bits for preempt priority, 0 bits for the
sub-priority), which is used in the stm32 port, the IRQ_PRI_xxx constants
remain unchanged in their value.

This patch also "fixes" the use of raise_irq_pri() which should be passed
the encoded value (but as mentioned above the unencoded value is the same
as the encoded value for priority grouping 4, so there was no bug from this
error).
2018-05-02 14:41:02 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 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 <stddef.h>
#include <string.h>
#include "py/runtime.h"
#include "py/gc.h"
#include "py/mphal.h"
#include "pin.h"
#include "extint.h"
#include "irq.h"
/// \moduleref pyb
/// \class ExtInt - configure I/O pins to interrupt on external events
///
/// There are a total of 22 interrupt lines. 16 of these can come from GPIO pins
/// and the remaining 6 are from internal sources.
///
/// For lines 0 thru 15, a given line can map to the corresponding line from an
/// arbitrary port. So line 0 can map to Px0 where x is A, B, C, ... and
/// line 1 can map to Px1 where x is A, B, C, ...
///
/// def callback(line):
/// print("line =", line)
///
/// Note: ExtInt will automatically configure the gpio line as an input.
///
/// extint = pyb.ExtInt(pin, pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)
///
/// Now every time a falling edge is seen on the X1 pin, the callback will be
/// called. Caution: mechanical pushbuttons have "bounce" and pushing or
/// releasing a switch will often generate multiple edges.
/// See: http://www.eng.utah.edu/~cs5780/debouncing.pdf for a detailed
/// explanation, along with various techniques for debouncing.
///
/// Trying to register 2 callbacks onto the same pin will throw an exception.
///
/// If pin is passed as an integer, then it is assumed to map to one of the
/// internal interrupt sources, and must be in the range 16 thru 22.
///
/// All other pin objects go through the pin mapper to come up with one of the
/// gpio pins.
///
/// extint = pyb.ExtInt(pin, mode, pull, callback)
///
/// Valid modes are pyb.ExtInt.IRQ_RISING, pyb.ExtInt.IRQ_FALLING,
/// pyb.ExtInt.IRQ_RISING_FALLING, pyb.ExtInt.EVT_RISING,
/// pyb.ExtInt.EVT_FALLING, and pyb.ExtInt.EVT_RISING_FALLING.
///
/// Only the IRQ_xxx modes have been tested. The EVT_xxx modes have
/// something to do with sleep mode and the WFE instruction.
///
/// Valid pull values are pyb.Pin.PULL_UP, pyb.Pin.PULL_DOWN, pyb.Pin.PULL_NONE.
///
/// There is also a C API, so that drivers which require EXTI interrupt lines
/// can also use this code. See extint.h for the available functions and
/// usrsw.h for an example of using this.
// TODO Add python method to change callback object.
#define EXTI_OFFSET (EXTI_BASE - PERIPH_BASE)
// Macro used to set/clear the bit corresponding to the line in the IMR/EMR
// register in an atomic fashion by using bitband addressing.
#define EXTI_MODE_BB(mode, line) (*(__IO uint32_t *)(PERIPH_BB_BASE + ((EXTI_OFFSET + (mode)) * 32) + ((line) * 4)))
#if defined(STM32L4)
// The L4 MCU supports 40 Events/IRQs lines of the type configurable and direct.
// Here we only support configurable line types. Details, see page 330 of RM0351, Rev 1.
// The USB_FS_WAKUP event is a direct type and there is no support for it.
#define EXTI_Mode_Interrupt offsetof(EXTI_TypeDef, IMR1)
#define EXTI_Mode_Event offsetof(EXTI_TypeDef, EMR1)
#define EXTI_RTSR EXTI->RTSR1
#define EXTI_FTSR EXTI->FTSR1
#elif defined(STM32H7)
#define EXTI_Mode_Interrupt offsetof(EXTI_Core_TypeDef, IMR1)
#define EXTI_Mode_Event offsetof(EXTI_Core_TypeDef, EMR1)
#define EXTI_RTSR EXTI->RTSR1
#define EXTI_FTSR EXTI->FTSR1
#else
#define EXTI_Mode_Interrupt offsetof(EXTI_TypeDef, IMR)
#define EXTI_Mode_Event offsetof(EXTI_TypeDef, EMR)
#define EXTI_RTSR EXTI->RTSR
#define EXTI_FTSR EXTI->FTSR
#endif
#define EXTI_SWIER_BB(line) (*(__IO uint32_t *)(PERIPH_BB_BASE + ((EXTI_OFFSET + offsetof(EXTI_TypeDef, SWIER)) * 32) + ((line) * 4)))
typedef struct {
mp_obj_base_t base;
mp_int_t line;
} extint_obj_t;
STATIC uint8_t pyb_extint_mode[EXTI_NUM_VECTORS];
STATIC bool pyb_extint_hard_irq[EXTI_NUM_VECTORS];
// The callback arg is a small-int or a ROM Pin object, so no need to scan by GC
STATIC mp_obj_t pyb_extint_callback_arg[EXTI_NUM_VECTORS];
#if !defined(ETH)
#define ETH_WKUP_IRQn 62 // Some MCUs don't have ETH, but we want a value to put in our table
#endif
#if !defined(OTG_HS_WKUP_IRQn)
#define OTG_HS_WKUP_IRQn 76 // Some MCUs don't have HS, but we want a value to put in our table
#endif
#if !defined(OTG_FS_WKUP_IRQn)
#define OTG_FS_WKUP_IRQn 42 // Some MCUs don't have FS IRQ, but we want a value to put in our table
#endif
STATIC const uint8_t nvic_irq_channel[EXTI_NUM_VECTORS] = {
EXTI0_IRQn, EXTI1_IRQn, EXTI2_IRQn, EXTI3_IRQn, EXTI4_IRQn,
EXTI9_5_IRQn, EXTI9_5_IRQn, EXTI9_5_IRQn, EXTI9_5_IRQn, EXTI9_5_IRQn,
EXTI15_10_IRQn, EXTI15_10_IRQn, EXTI15_10_IRQn, EXTI15_10_IRQn, EXTI15_10_IRQn,
EXTI15_10_IRQn,
#if defined(STM32L4)
PVD_PVM_IRQn,
#else
PVD_IRQn,
#endif
RTC_Alarm_IRQn,
OTG_FS_WKUP_IRQn,
ETH_WKUP_IRQn,
OTG_HS_WKUP_IRQn,
TAMP_STAMP_IRQn,
RTC_WKUP_IRQn,
};
// Set override_callback_obj to true if you want to unconditionally set the
// callback function.
uint extint_register(mp_obj_t pin_obj, uint32_t mode, uint32_t pull, mp_obj_t callback_obj, bool override_callback_obj) {
const pin_obj_t *pin = NULL;
uint v_line;
if (MP_OBJ_IS_INT(pin_obj)) {
// If an integer is passed in, then use it to identify lines 16 thru 22
// We expect lines 0 thru 15 to be passed in as a pin, so that we can
// get both the port number and line number.
v_line = mp_obj_get_int(pin_obj);
if (v_line < 16) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "ExtInt vector %d < 16, use a Pin object", v_line));
}
if (v_line >= EXTI_NUM_VECTORS) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "ExtInt vector %d >= max of %d", v_line, EXTI_NUM_VECTORS));
}
} else {
pin = pin_find(pin_obj);
v_line = pin->pin;
}
if (mode != GPIO_MODE_IT_RISING &&
mode != GPIO_MODE_IT_FALLING &&
mode != GPIO_MODE_IT_RISING_FALLING &&
mode != GPIO_MODE_EVT_RISING &&
mode != GPIO_MODE_EVT_FALLING &&
mode != GPIO_MODE_EVT_RISING_FALLING) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid ExtInt Mode: %d", mode));
}
if (pull != GPIO_NOPULL &&
pull != GPIO_PULLUP &&
pull != GPIO_PULLDOWN) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid ExtInt Pull: %d", pull));
}
mp_obj_t *cb = &MP_STATE_PORT(pyb_extint_callback)[v_line];
if (!override_callback_obj && *cb != mp_const_none && callback_obj != mp_const_none) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "ExtInt vector %d is already in use", v_line));
}
// We need to update callback atomically, so we disable the line
// before we update anything.
extint_disable(v_line);
*cb = callback_obj;
pyb_extint_mode[v_line] = (mode & 0x00010000) ? // GPIO_MODE_IT == 0x00010000
EXTI_Mode_Interrupt : EXTI_Mode_Event;
if (*cb != mp_const_none) {
pyb_extint_hard_irq[v_line] = true;
pyb_extint_callback_arg[v_line] = MP_OBJ_NEW_SMALL_INT(v_line);
mp_hal_gpio_clock_enable(pin->gpio);
GPIO_InitTypeDef exti;
exti.Pin = pin->pin_mask;
exti.Mode = mode;
exti.Pull = pull;
exti.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(pin->gpio, &exti);
// Calling HAL_GPIO_Init does an implicit extint_enable
/* Enable and set NVIC Interrupt to the lowest priority */
NVIC_SetPriority(IRQn_NONNEG(nvic_irq_channel[v_line]), IRQ_PRI_EXTINT);
HAL_NVIC_EnableIRQ(nvic_irq_channel[v_line]);
}
return v_line;
}
// This function is intended to be used by the Pin.irq() method
void extint_register_pin(const pin_obj_t *pin, uint32_t mode, bool hard_irq, mp_obj_t callback_obj) {
uint32_t line = pin->pin;
// Check if the ExtInt line is already in use by another Pin/ExtInt
mp_obj_t *cb = &MP_STATE_PORT(pyb_extint_callback)[line];
if (*cb != mp_const_none && MP_OBJ_FROM_PTR(pin) != pyb_extint_callback_arg[line]) {
if (MP_OBJ_IS_SMALL_INT(pyb_extint_callback_arg[line])) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
"ExtInt vector %d is already in use", line));
} else {
const pin_obj_t *other_pin = (const pin_obj_t*)pyb_extint_callback_arg[line];
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
"IRQ resource already taken by Pin('%q')", other_pin->name));
}
}
extint_disable(line);
*cb = callback_obj;
pyb_extint_mode[line] = (mode & 0x00010000) ? // GPIO_MODE_IT == 0x00010000
EXTI_Mode_Interrupt : EXTI_Mode_Event;
if (*cb != mp_const_none) {
// Configure and enable the callback
pyb_extint_hard_irq[line] = hard_irq;
pyb_extint_callback_arg[line] = MP_OBJ_FROM_PTR(pin);
// Route the GPIO to EXTI
__HAL_RCC_SYSCFG_CLK_ENABLE();
SYSCFG->EXTICR[line >> 2] =
(SYSCFG->EXTICR[line >> 2] & ~(0x0f << (4 * (line & 0x03))))
| ((uint32_t)(GPIO_GET_INDEX(pin->gpio)) << (4 * (line & 0x03)));
// Enable or disable the rising detector
if ((mode & GPIO_MODE_IT_RISING) == GPIO_MODE_IT_RISING) {
EXTI_RTSR |= 1 << line;
} else {
EXTI_RTSR &= ~(1 << line);
}
// Enable or disable the falling detector
if ((mode & GPIO_MODE_IT_FALLING) == GPIO_MODE_IT_FALLING) {
EXTI_FTSR |= 1 << line;
} else {
EXTI_FTSR &= ~(1 << line);
}
// Configure the NVIC
NVIC_SetPriority(IRQn_NONNEG(nvic_irq_channel[line]), IRQ_PRI_EXTINT);
HAL_NVIC_EnableIRQ(nvic_irq_channel[line]);
// Enable the interrupt
extint_enable(line);
}
}
void extint_enable(uint line) {
if (line >= EXTI_NUM_VECTORS) {
return;
}
#if defined(STM32F7) || defined(STM32H7)
// The Cortex-M7 doesn't have bitband support.
mp_uint_t irq_state = disable_irq();
if (pyb_extint_mode[line] == EXTI_Mode_Interrupt) {
#if defined(STM32H7)
EXTI_D1->IMR1 |= (1 << line);
#else
EXTI->IMR |= (1 << line);
#endif
} else {
#if defined(STM32H7)
EXTI_D1->EMR1 |= (1 << line);
#else
EXTI->EMR |= (1 << line);
#endif
}
enable_irq(irq_state);
#else
// Since manipulating IMR/EMR is a read-modify-write, and we want this to
// be atomic, we use the bit-band area to just affect the bit we're
// interested in.
EXTI_MODE_BB(pyb_extint_mode[line], line) = 1;
#endif
}
void extint_disable(uint line) {
if (line >= EXTI_NUM_VECTORS) {
return;
}
#if defined(STM32F7) || defined(STM32H7)
// The Cortex-M7 doesn't have bitband support.
mp_uint_t irq_state = disable_irq();
#if defined(STM32H7)
EXTI_D1->IMR1 &= ~(1 << line);
EXTI_D1->EMR1 &= ~(1 << line);
#else
EXTI->IMR &= ~(1 << line);
EXTI->EMR &= ~(1 << line);
#endif
enable_irq(irq_state);
#else
// Since manipulating IMR/EMR is a read-modify-write, and we want this to
// be atomic, we use the bit-band area to just affect the bit we're
// interested in.
EXTI_MODE_BB(EXTI_Mode_Interrupt, line) = 0;
EXTI_MODE_BB(EXTI_Mode_Event, line) = 0;
#endif
}
void extint_swint(uint line) {
if (line >= EXTI_NUM_VECTORS) {
return;
}
// we need 0 to 1 transition to trigger the interrupt
#if defined(STM32L4) || defined(STM32H7)
EXTI->SWIER1 &= ~(1 << line);
EXTI->SWIER1 |= (1 << line);
#else
EXTI->SWIER &= ~(1 << line);
EXTI->SWIER |= (1 << line);
#endif
}
/// \method line()
/// Return the line number that the pin is mapped to.
STATIC mp_obj_t extint_obj_line(mp_obj_t self_in) {
extint_obj_t *self = self_in;
return MP_OBJ_NEW_SMALL_INT(self->line);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(extint_obj_line_obj, extint_obj_line);
/// \method enable()
/// Enable a disabled interrupt.
STATIC mp_obj_t extint_obj_enable(mp_obj_t self_in) {
extint_obj_t *self = self_in;
extint_enable(self->line);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(extint_obj_enable_obj, extint_obj_enable);
/// \method disable()
/// Disable the interrupt associated with the ExtInt object.
/// This could be useful for debouncing.
STATIC mp_obj_t extint_obj_disable(mp_obj_t self_in) {
extint_obj_t *self = self_in;
extint_disable(self->line);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(extint_obj_disable_obj, extint_obj_disable);
/// \method swint()
/// Trigger the callback from software.
STATIC mp_obj_t extint_obj_swint(mp_obj_t self_in) {
extint_obj_t *self = self_in;
extint_swint(self->line);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(extint_obj_swint_obj, extint_obj_swint);
// TODO document as a staticmethod
/// \classmethod regs()
/// Dump the values of the EXTI registers.
STATIC mp_obj_t extint_regs(void) {
#if defined(STM32L4)
printf("EXTI_IMR1 %08lx\n", EXTI->IMR1);
printf("EXTI_IMR2 %08lx\n", EXTI->IMR2);
printf("EXTI_EMR1 %08lx\n", EXTI->EMR1);
printf("EXTI_EMR2 %08lx\n", EXTI->EMR2);
printf("EXTI_RTSR1 %08lx\n", EXTI->RTSR1);
printf("EXTI_RTSR2 %08lx\n", EXTI->RTSR2);
printf("EXTI_FTSR1 %08lx\n", EXTI->FTSR1);
printf("EXTI_FTSR2 %08lx\n", EXTI->FTSR2);
printf("EXTI_SWIER1 %08lx\n", EXTI->SWIER1);
printf("EXTI_SWIER2 %08lx\n", EXTI->SWIER2);
printf("EXTI_PR1 %08lx\n", EXTI->PR1);
printf("EXTI_PR2 %08lx\n", EXTI->PR2);
#elif defined(STM32H7)
printf("EXTI_IMR1 %08lx\n", EXTI_D1->IMR1);
printf("EXTI_IMR2 %08lx\n", EXTI_D1->IMR2);
printf("EXTI_IMR3 %08lx\n", EXTI_D1->IMR3);
printf("EXTI_EMR1 %08lx\n", EXTI_D1->EMR1);
printf("EXTI_EMR2 %08lx\n", EXTI_D1->EMR2);
printf("EXTI_EMR3 %08lx\n", EXTI_D1->EMR3);
printf("EXTI_RTSR1 %08lx\n", EXTI->RTSR1);
printf("EXTI_RTSR2 %08lx\n", EXTI->RTSR2);
printf("EXTI_RTSR3 %08lx\n", EXTI->RTSR3);
printf("EXTI_FTSR1 %08lx\n", EXTI->FTSR1);
printf("EXTI_FTSR2 %08lx\n", EXTI->FTSR2);
printf("EXTI_FTSR3 %08lx\n", EXTI->FTSR3);
printf("EXTI_SWIER1 %08lx\n", EXTI->SWIER1);
printf("EXTI_SWIER2 %08lx\n", EXTI->SWIER2);
printf("EXTI_SWIER3 %08lx\n", EXTI->SWIER3);
printf("EXTI_PR1 %08lx\n", EXTI_D1->PR1);
printf("EXTI_PR2 %08lx\n", EXTI_D1->PR2);
printf("EXTI_PR3 %08lx\n", EXTI_D1->PR3);
#else
printf("EXTI_IMR %08lx\n", EXTI->IMR);
printf("EXTI_EMR %08lx\n", EXTI->EMR);
printf("EXTI_RTSR %08lx\n", EXTI->RTSR);
printf("EXTI_FTSR %08lx\n", EXTI->FTSR);
printf("EXTI_SWIER %08lx\n", EXTI->SWIER);
printf("EXTI_PR %08lx\n", EXTI->PR);
#endif
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(extint_regs_fun_obj, extint_regs);
STATIC MP_DEFINE_CONST_STATICMETHOD_OBJ(extint_regs_obj, (mp_obj_t)&extint_regs_fun_obj);
/// \classmethod \constructor(pin, mode, pull, callback)
/// Create an ExtInt object:
///
/// - `pin` is the pin on which to enable the interrupt (can be a pin object or any valid pin name).
/// - `mode` can be one of:
/// - `ExtInt.IRQ_RISING` - trigger on a rising edge;
/// - `ExtInt.IRQ_FALLING` - trigger on a falling edge;
/// - `ExtInt.IRQ_RISING_FALLING` - trigger on a rising or falling edge.
/// - `pull` can be one of:
/// - `pyb.Pin.PULL_NONE` - no pull up or down resistors;
/// - `pyb.Pin.PULL_UP` - enable the pull-up resistor;
/// - `pyb.Pin.PULL_DOWN` - enable the pull-down resistor.
/// - `callback` is the function to call when the interrupt triggers. The
/// callback function must accept exactly 1 argument, which is the line that
/// triggered the interrupt.
STATIC const mp_arg_t pyb_extint_make_new_args[] = {
{ MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_pull, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_callback, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
};
#define PYB_EXTINT_MAKE_NEW_NUM_ARGS MP_ARRAY_SIZE(pyb_extint_make_new_args)
STATIC mp_obj_t extint_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// type_in == extint_obj_type
// parse args
mp_arg_val_t vals[PYB_EXTINT_MAKE_NEW_NUM_ARGS];
mp_arg_parse_all_kw_array(n_args, n_kw, args, PYB_EXTINT_MAKE_NEW_NUM_ARGS, pyb_extint_make_new_args, vals);
extint_obj_t *self = m_new_obj(extint_obj_t);
self->base.type = type;
self->line = extint_register(vals[0].u_obj, vals[1].u_int, vals[2].u_int, vals[3].u_obj, false);
return self;
}
STATIC void extint_obj_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
extint_obj_t *self = self_in;
mp_printf(print, "<ExtInt line=%u>", self->line);
}
STATIC const mp_rom_map_elem_t extint_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_line), MP_ROM_PTR(&extint_obj_line_obj) },
{ MP_ROM_QSTR(MP_QSTR_enable), MP_ROM_PTR(&extint_obj_enable_obj) },
{ MP_ROM_QSTR(MP_QSTR_disable), MP_ROM_PTR(&extint_obj_disable_obj) },
{ MP_ROM_QSTR(MP_QSTR_swint), MP_ROM_PTR(&extint_obj_swint_obj) },
{ MP_ROM_QSTR(MP_QSTR_regs), MP_ROM_PTR(&extint_regs_obj) },
// class constants
/// \constant IRQ_RISING - interrupt on a rising edge
/// \constant IRQ_FALLING - interrupt on a falling edge
/// \constant IRQ_RISING_FALLING - interrupt on a rising or falling edge
{ MP_ROM_QSTR(MP_QSTR_IRQ_RISING), MP_ROM_INT(GPIO_MODE_IT_RISING) },
{ MP_ROM_QSTR(MP_QSTR_IRQ_FALLING), MP_ROM_INT(GPIO_MODE_IT_FALLING) },
{ MP_ROM_QSTR(MP_QSTR_IRQ_RISING_FALLING), MP_ROM_INT(GPIO_MODE_IT_RISING_FALLING) },
{ MP_ROM_QSTR(MP_QSTR_EVT_RISING), MP_ROM_INT(GPIO_MODE_EVT_RISING) },
{ MP_ROM_QSTR(MP_QSTR_EVT_FALLING), MP_ROM_INT(GPIO_MODE_EVT_FALLING) },
{ MP_ROM_QSTR(MP_QSTR_EVT_RISING_FALLING), MP_ROM_INT(GPIO_MODE_EVT_RISING_FALLING) },
};
STATIC MP_DEFINE_CONST_DICT(extint_locals_dict, extint_locals_dict_table);
const mp_obj_type_t extint_type = {
{ &mp_type_type },
.name = MP_QSTR_ExtInt,
.print = extint_obj_print,
.make_new = extint_make_new,
.locals_dict = (mp_obj_dict_t*)&extint_locals_dict,
};
void extint_init0(void) {
for (int i = 0; i < PYB_EXTI_NUM_VECTORS; i++) {
MP_STATE_PORT(pyb_extint_callback)[i] = mp_const_none;
pyb_extint_mode[i] = EXTI_Mode_Interrupt;
}
}
// Interrupt handler
void Handle_EXTI_Irq(uint32_t line) {
if (__HAL_GPIO_EXTI_GET_FLAG(1 << line)) {
__HAL_GPIO_EXTI_CLEAR_FLAG(1 << line);
if (line < EXTI_NUM_VECTORS) {
mp_obj_t *cb = &MP_STATE_PORT(pyb_extint_callback)[line];
if (*cb != mp_const_none) {
// If it's a soft IRQ handler then just schedule callback for later
if (!pyb_extint_hard_irq[line]) {
mp_sched_schedule(*cb, pyb_extint_callback_arg[line]);
return;
}
mp_sched_lock();
// When executing code within a handler we must lock the GC to prevent
// any memory allocations. We must also catch any exceptions.
gc_lock();
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_call_function_1(*cb, pyb_extint_callback_arg[line]);
nlr_pop();
} else {
// Uncaught exception; disable the callback so it doesn't run again.
*cb = mp_const_none;
extint_disable(line);
printf("Uncaught exception in ExtInt interrupt handler line %lu\n", line);
mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
}
gc_unlock();
mp_sched_unlock();
}
}
}
}
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