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esp8266: Add machine.time_pulse_us function, to time input pulses. #2091

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esp8266: Add machine.time_pulse_us function, to time input pulses. #2091

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33 changes: 33 additions & 0 deletions esp8266/modmachine.c
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Expand Up @@ -29,6 +29,8 @@

#include "py/obj.h"
#include "py/runtime.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_i2c.h"
#include "modpyb.h"
Expand Down Expand Up @@ -189,6 +191,35 @@ const mp_obj_type_t esp_timer_type = {
.locals_dict = (mp_obj_t)&esp_timer_locals_dict,
};

STATIC mp_obj_t time_pulse_us(size_t n_args, const mp_obj_t *args) {
mp_hal_pin_obj_t pin = mp_hal_get_pin_obj(args[0]);
int state = 0;
if (mp_obj_is_true(args[1])) {
state = 1;
}
uint32_t timeout = 1000000;
if (n_args > 2) {
timeout = mp_obj_get_int(args[2]);
}
uint32_t start = mp_hal_ticks_us();
while (mp_hal_pin_read(pin) != state) {
if ((uint32_t)(mp_hal_ticks_us() - start) >= timeout) {
goto timeout;
}
}
start = mp_hal_ticks_us();
while (mp_hal_pin_read(pin) == state) {
if ((uint32_t)(mp_hal_ticks_us() - start) >= timeout) {
goto timeout;
}
}
return mp_obj_new_int(mp_hal_ticks_us() - start);

timeout:
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(MP_ETIMEDOUT)));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(time_pulse_us_obj, 2, 3, time_pulse_us);

STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_umachine) },
{ MP_ROM_QSTR(MP_QSTR_mem8), MP_ROM_PTR(&machine_mem8_obj) },
Expand All @@ -201,6 +232,8 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) },
{ MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) },

{ MP_ROM_QSTR(MP_QSTR_time_pulse_us), MP_ROM_PTR(&time_pulse_us_obj) },

{ MP_ROM_QSTR(MP_QSTR_RTC), MP_ROM_PTR(&pyb_rtc_type) },
{ MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&esp_timer_type) },
{ MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&pyb_pin_type) },
Expand Down