/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2013, 2014 Damien P. George * Copyright (c) 2015 Daniel Campora * * 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 #include #include #include "py/mpconfig.h" #include "py/obj.h" #include "py/nlr.h" #include "py/runtime.h" #include "py/gc.h" #include "py/mperrno.h" #include "py/mphal.h" #include "inc/hw_types.h" #include "inc/hw_ints.h" #include "inc/hw_memmap.h" #include "inc/hw_timer.h" #include "rom_map.h" #include "interrupt.h" #include "prcm.h" #include "timer.h" #include "pin.h" #include "pybtimer.h" #include "pybpin.h" #include "pins.h" #include "mpirq.h" #include "pybsleep.h" #include "mpexception.h" /// \moduleref pyb /// \class Timer - generate periodic events, count events, and create PWM signals. /// /// Each timer consists of a counter that counts up at a certain rate. The rate /// at which it counts is the peripheral clock frequency (in Hz) divided by the /// timer prescaler. When the counter reaches the timer period it triggers an /// event, and the counter resets back to zero. By using the irq method, /// the timer event can call a Python function. /****************************************************************************** DECLARE PRIVATE CONSTANTS ******************************************************************************/ #define PYBTIMER_NUM_TIMERS (4) #define PYBTIMER_POLARITY_POS (0x01) #define PYBTIMER_POLARITY_NEG (0x02) #define PYBTIMER_TIMEOUT_TRIGGER (0x01) #define PYBTIMER_MATCH_TRIGGER (0x02) #define PYBTIMER_SRC_FREQ_HZ HAL_FCPU_HZ /****************************************************************************** DEFINE PRIVATE TYPES ******************************************************************************/ typedef struct _pyb_timer_obj_t { mp_obj_base_t base; uint32_t timer; uint32_t config; uint16_t irq_trigger; uint16_t irq_flags; uint8_t peripheral; uint8_t id; } pyb_timer_obj_t; typedef struct _pyb_timer_channel_obj_t { mp_obj_base_t base; struct _pyb_timer_obj_t *timer; uint32_t frequency; uint32_t period; uint16_t channel; uint16_t duty_cycle; uint8_t polarity; } pyb_timer_channel_obj_t; /****************************************************************************** DEFINE PRIVATE DATA ******************************************************************************/ STATIC const mp_irq_methods_t pyb_timer_channel_irq_methods; STATIC pyb_timer_obj_t pyb_timer_obj[PYBTIMER_NUM_TIMERS] = {{.timer = TIMERA0_BASE, .peripheral = PRCM_TIMERA0}, {.timer = TIMERA1_BASE, .peripheral = PRCM_TIMERA1}, {.timer = TIMERA2_BASE, .peripheral = PRCM_TIMERA2}, {.timer = TIMERA3_BASE, .peripheral = PRCM_TIMERA3}}; STATIC const mp_obj_type_t pyb_timer_channel_type; STATIC const mp_obj_t pyb_timer_pwm_pin[8] = {&pin_GP24, MP_OBJ_NULL, &pin_GP25, MP_OBJ_NULL, MP_OBJ_NULL, &pin_GP9, &pin_GP10, &pin_GP11}; /****************************************************************************** DECLARE PRIVATE FUNCTIONS ******************************************************************************/ STATIC mp_obj_t pyb_timer_channel_irq (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args); STATIC void timer_disable (pyb_timer_obj_t *tim); STATIC void timer_channel_init (pyb_timer_channel_obj_t *ch); STATIC void TIMER0AIntHandler(void); STATIC void TIMER0BIntHandler(void); STATIC void TIMER1AIntHandler(void); STATIC void TIMER1BIntHandler(void); STATIC void TIMER2AIntHandler(void); STATIC void TIMER2BIntHandler(void); STATIC void TIMER3AIntHandler(void); STATIC void TIMER3BIntHandler(void); /****************************************************************************** DEFINE PUBLIC FUNCTIONS ******************************************************************************/ void timer_init0 (void) { mp_obj_list_init(&MP_STATE_PORT(pyb_timer_channel_obj_list), 0); } /****************************************************************************** DEFINE PRIVATE FUNCTIONS ******************************************************************************/ STATIC void pyb_timer_channel_irq_enable (mp_obj_t self_in) { pyb_timer_channel_obj_t *self = self_in; MAP_TimerIntClear(self->timer->timer, self->timer->irq_trigger & self->channel); MAP_TimerIntEnable(self->timer->timer, self->timer->irq_trigger & self->channel); } STATIC void pyb_timer_channel_irq_disable (mp_obj_t self_in) { pyb_timer_channel_obj_t *self = self_in; MAP_TimerIntDisable(self->timer->timer, self->timer->irq_trigger & self->channel); } STATIC int pyb_timer_channel_irq_flags (mp_obj_t self_in) { pyb_timer_channel_obj_t *self = self_in; return self->timer->irq_flags; } STATIC pyb_timer_channel_obj_t *pyb_timer_channel_find (uint32_t timer, uint16_t channel_n) { for (mp_uint_t i = 0; i < MP_STATE_PORT(pyb_timer_channel_obj_list).len; i++) { pyb_timer_channel_obj_t *ch = ((pyb_timer_channel_obj_t *)(MP_STATE_PORT(pyb_timer_channel_obj_list).items[i])); // any 32-bit timer must be matched by any of its 16-bit versions if (ch->timer->timer == timer && ((ch->channel & TIMER_A) == channel_n || (ch->channel & TIMER_B) == channel_n)) { return ch; } } return MP_OBJ_NULL; } STATIC void pyb_timer_channel_remove (pyb_timer_channel_obj_t *ch) { pyb_timer_channel_obj_t *channel; if ((channel = pyb_timer_channel_find(ch->timer->timer, ch->channel))) { mp_obj_list_remove(&MP_STATE_PORT(pyb_timer_channel_obj_list), channel); // unregister it with the sleep module pyb_sleep_remove((const mp_obj_t)channel); } } STATIC void pyb_timer_channel_add (pyb_timer_channel_obj_t *ch) { // remove it in case it already exists pyb_timer_channel_remove(ch); mp_obj_list_append(&MP_STATE_PORT(pyb_timer_channel_obj_list), ch); // register it with the sleep module pyb_sleep_add((const mp_obj_t)ch, (WakeUpCB_t)timer_channel_init); } STATIC void timer_disable (pyb_timer_obj_t *tim) { // disable all timers and it's interrupts MAP_TimerDisable(tim->timer, TIMER_A | TIMER_B); MAP_TimerIntDisable(tim->timer, tim->irq_trigger); MAP_TimerIntClear(tim->timer, tim->irq_trigger); pyb_timer_channel_obj_t *ch; // disable its channels if ((ch = pyb_timer_channel_find (tim->timer, TIMER_A))) { pyb_sleep_remove(ch); } if ((ch = pyb_timer_channel_find (tim->timer, TIMER_B))) { pyb_sleep_remove(ch); } MAP_PRCMPeripheralClkDisable(tim->peripheral, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK); } // computes prescaler period and match value so timer triggers at freq-Hz STATIC uint32_t compute_prescaler_period_and_match_value(pyb_timer_channel_obj_t *ch, uint32_t *period_out, uint32_t *match_out) { uint32_t maxcount = (ch->channel == (TIMER_A | TIMER_B)) ? 0xFFFFFFFF : 0xFFFF; uint32_t prescaler; uint32_t period_c = (ch->frequency > 0) ? PYBTIMER_SRC_FREQ_HZ / ch->frequency : ((PYBTIMER_SRC_FREQ_HZ / 1000000) * ch->period); period_c = MAX(1, period_c) - 1; if (period_c == 0) { goto error; } prescaler = period_c >> 16; // The prescaler is an extension of the timer counter *period_out = period_c; if (prescaler > 0xFF && maxcount == 0xFFFF) { goto error; } // check limit values for the duty cycle if (ch->duty_cycle == 0) { *match_out = period_c - 1; } else { if (period_c > 0xFFFF) { uint32_t match = (period_c * 100) / 10000; *match_out = period_c - ((match * ch->duty_cycle) / 100); } else { *match_out = period_c - ((period_c * ch->duty_cycle) / 10000); } } return prescaler; error: mp_raise_ValueError(mpexception_value_invalid_arguments); } STATIC void timer_init (pyb_timer_obj_t *tim) { MAP_PRCMPeripheralClkEnable(tim->peripheral, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK); MAP_PRCMPeripheralReset(tim->peripheral); MAP_TimerConfigure(tim->timer, tim->config); } STATIC void timer_channel_init (pyb_timer_channel_obj_t *ch) { // calculate the period, the prescaler and the match value uint32_t period_c; uint32_t match; uint32_t prescaler = compute_prescaler_period_and_match_value(ch, &period_c, &match); // set the prescaler MAP_TimerPrescaleSet(ch->timer->timer, ch->channel, (prescaler < 0xFF) ? prescaler : 0); // set the load value MAP_TimerLoadSet(ch->timer->timer, ch->channel, period_c); // configure the pwm if we are in such mode if ((ch->timer->config & 0x0F) == TIMER_CFG_A_PWM) { // invert the timer output if required MAP_TimerControlLevel(ch->timer->timer, ch->channel, (ch->polarity == PYBTIMER_POLARITY_NEG) ? true : false); // set the match value (which is simply the duty cycle translated to ticks) MAP_TimerMatchSet(ch->timer->timer, ch->channel, match); MAP_TimerPrescaleMatchSet(ch->timer->timer, ch->channel, match >> 16); } #ifdef DEBUG // stall the timer when the processor is halted while debugging MAP_TimerControlStall(ch->timer->timer, ch->channel, true); #endif // now enable the timer channel MAP_TimerEnable(ch->timer->timer, ch->channel); } /******************************************************************************/ /* MicroPython bindings */ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { pyb_timer_obj_t *tim = self_in; uint32_t mode = tim->config & 0xFF; // timer mode qstr mode_qst = MP_QSTR_PWM; switch(mode) { case TIMER_CFG_A_ONE_SHOT_UP: mode_qst = MP_QSTR_ONE_SHOT; break; case TIMER_CFG_A_PERIODIC_UP: mode_qst = MP_QSTR_PERIODIC; break; default: break; } mp_printf(print, "Timer(%u, mode=Timer.%q)", tim->id, mode_qst); } STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { static const mp_arg_t allowed_args[] = { { MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, }, { MP_QSTR_width, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 16} }, }; // parse args mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); // check the mode uint32_t _mode = args[0].u_int; if (_mode != TIMER_CFG_A_ONE_SHOT_UP && _mode != TIMER_CFG_A_PERIODIC_UP && _mode != TIMER_CFG_A_PWM) { goto error; } // check the width if (args[1].u_int != 16 && args[1].u_int != 32) { goto error; } bool is16bit = (args[1].u_int == 16); if (!is16bit && _mode == TIMER_CFG_A_PWM) { // 32-bit mode is only available when in free running modes goto error; } tim->config = is16bit ? ((_mode | (_mode << 8)) | TIMER_CFG_SPLIT_PAIR) : _mode; timer_init(tim); // register it with the sleep module pyb_sleep_add ((const mp_obj_t)tim, (WakeUpCB_t)timer_init); return mp_const_none; error: mp_raise_ValueError(mpexception_value_invalid_arguments); } STATIC mp_obj_t pyb_timer_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, 1, MP_OBJ_FUN_ARGS_MAX, true); // create a new Timer object int32_t timer_idx = mp_obj_get_int(args[0]); if (timer_idx < 0 || timer_idx > (PYBTIMER_NUM_TIMERS - 1)) { mp_raise_OSError(MP_ENODEV); } pyb_timer_obj_t *tim = &pyb_timer_obj[timer_idx]; tim->base.type = &pyb_timer_type; tim->id = timer_idx; if (n_args > 1 || n_kw > 0) { // start the peripheral mp_map_t kw_args; mp_map_init_fixed_table(&kw_args, n_kw, args + n_args); pyb_timer_init_helper(tim, n_args - 1, args + 1, &kw_args); } return (mp_obj_t)tim; } STATIC mp_obj_t pyb_timer_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) { return pyb_timer_init_helper(args[0], n_args - 1, args + 1, kw_args); } STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_timer_init_obj, 1, pyb_timer_init); STATIC mp_obj_t pyb_timer_deinit(mp_obj_t self_in) { pyb_timer_obj_t *self = self_in; timer_disable(self); return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_deinit_obj, pyb_timer_deinit); STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { static const mp_arg_t allowed_args[] = { { MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} }, { MP_QSTR_period, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} }, { MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = PYBTIMER_POLARITY_POS} }, { MP_QSTR_duty_cycle, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} }, }; pyb_timer_obj_t *tim = pos_args[0]; mp_int_t channel_n = mp_obj_get_int(pos_args[1]); // verify that the timer has been already initialized if (!tim->config) { mp_raise_OSError(MP_EPERM); } if (channel_n != TIMER_A && channel_n != TIMER_B && channel_n != (TIMER_A | TIMER_B)) { // invalid channel goto error; } if (channel_n == (TIMER_A | TIMER_B) && (tim->config & TIMER_CFG_SPLIT_PAIR)) { // 32-bit channel selected when the timer is in 16-bit mode goto error; } // if only the channel number is given return the previously // allocated channel (or None if no previous channel) if (n_args == 2 && kw_args->used == 0) { pyb_timer_channel_obj_t *ch; if ((ch = pyb_timer_channel_find(tim->timer, channel_n))) { return ch; } return mp_const_none; } // parse the arguments mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args - 2, pos_args + 2, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); // throw an exception if both frequency and period are given if (args[0].u_int != 0 && args[1].u_int != 0) { goto error; } // check that at least one of them has a valid value if (args[0].u_int <= 0 && args[1].u_int <= 0) { goto error; } // check that the polarity is not 'both' in pwm mode if ((tim->config & TIMER_A) == TIMER_CFG_A_PWM && args[2].u_int == (PYBTIMER_POLARITY_POS | PYBTIMER_POLARITY_NEG)) { goto error; } // allocate a new timer channel pyb_timer_channel_obj_t *ch = m_new_obj(pyb_timer_channel_obj_t); ch->base.type = &pyb_timer_channel_type; ch->timer = tim; ch->channel = channel_n; // get the frequency the polarity and the duty cycle ch->frequency = args[0].u_int; ch->period = args[1].u_int; ch->polarity = args[2].u_int; ch->duty_cycle = MIN(10000, MAX(0, args[3].u_int)); timer_channel_init(ch); // assign the pin if ((ch->timer->config & 0x0F) == TIMER_CFG_A_PWM) { uint32_t ch_idx = (ch->channel == TIMER_A) ? 0 : 1; // use the default pin if available mp_obj_t pin_o = (mp_obj_t)pyb_timer_pwm_pin[(ch->timer->id * 2) + ch_idx]; if (pin_o != MP_OBJ_NULL) { pin_obj_t *pin = pin_find(pin_o); pin_config (pin, pin_find_af_index(pin, PIN_FN_TIM, ch->timer->id, PIN_TYPE_TIM_PWM), 0, PIN_TYPE_STD, -1, PIN_STRENGTH_4MA); } } // add the timer to the list pyb_timer_channel_add(ch); return ch; error: mp_raise_ValueError(mpexception_value_invalid_arguments); } STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_timer_channel_obj, 2, pyb_timer_channel); STATIC const mp_map_elem_t pyb_timer_locals_dict_table[] = { // instance methods { MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_timer_init_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&pyb_timer_deinit_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_channel), (mp_obj_t)&pyb_timer_channel_obj }, // class constants { MP_OBJ_NEW_QSTR(MP_QSTR_A), MP_OBJ_NEW_SMALL_INT(TIMER_A) }, { MP_OBJ_NEW_QSTR(MP_QSTR_B), MP_OBJ_NEW_SMALL_INT(TIMER_B) }, { MP_OBJ_NEW_QSTR(MP_QSTR_ONE_SHOT), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_ONE_SHOT_UP) }, { MP_OBJ_NEW_QSTR(MP_QSTR_PERIODIC), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_PERIODIC_UP) }, { MP_OBJ_NEW_QSTR(MP_QSTR_PWM), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_PWM) }, { MP_OBJ_NEW_QSTR(MP_QSTR_POSITIVE), MP_OBJ_NEW_SMALL_INT(PYBTIMER_POLARITY_POS) }, { MP_OBJ_NEW_QSTR(MP_QSTR_NEGATIVE), MP_OBJ_NEW_SMALL_INT(PYBTIMER_POLARITY_NEG) }, { MP_OBJ_NEW_QSTR(MP_QSTR_TIMEOUT), MP_OBJ_NEW_SMALL_INT(PYBTIMER_TIMEOUT_TRIGGER) }, { MP_OBJ_NEW_QSTR(MP_QSTR_MATCH), MP_OBJ_NEW_SMALL_INT(PYBTIMER_MATCH_TRIGGER) }, }; STATIC MP_DEFINE_CONST_DICT(pyb_timer_locals_dict, pyb_timer_locals_dict_table); const mp_obj_type_t pyb_timer_type = { { &mp_type_type }, .name = MP_QSTR_Timer, .print = pyb_timer_print, .make_new = pyb_timer_make_new, .locals_dict = (mp_obj_t)&pyb_timer_locals_dict, }; STATIC const mp_irq_methods_t pyb_timer_channel_irq_methods = { .init = pyb_timer_channel_irq, .enable = pyb_timer_channel_irq_enable, .disable = pyb_timer_channel_irq_disable, .flags = pyb_timer_channel_irq_flags, }; STATIC void TIMERGenericIntHandler(uint32_t timer, uint16_t channel) { pyb_timer_channel_obj_t *self; uint32_t status; if ((self = pyb_timer_channel_find(timer, channel))) { status = MAP_TimerIntStatus(self->timer->timer, true) & self->channel; MAP_TimerIntClear(self->timer->timer, status); mp_irq_handler(mp_irq_find(self)); } } STATIC void TIMER0AIntHandler(void) { TIMERGenericIntHandler(TIMERA0_BASE, TIMER_A); } STATIC void TIMER0BIntHandler(void) { TIMERGenericIntHandler(TIMERA0_BASE, TIMER_B); } STATIC void TIMER1AIntHandler(void) { TIMERGenericIntHandler(TIMERA1_BASE, TIMER_A); } STATIC void TIMER1BIntHandler(void) { TIMERGenericIntHandler(TIMERA1_BASE, TIMER_B); } STATIC void TIMER2AIntHandler(void) { TIMERGenericIntHandler(TIMERA2_BASE, TIMER_A); } STATIC void TIMER2BIntHandler(void) { TIMERGenericIntHandler(TIMERA2_BASE, TIMER_B); } STATIC void TIMER3AIntHandler(void) { TIMERGenericIntHandler(TIMERA3_BASE, TIMER_A); } STATIC void TIMER3BIntHandler(void) { TIMERGenericIntHandler(TIMERA3_BASE, TIMER_B); } STATIC void pyb_timer_channel_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { pyb_timer_channel_obj_t *ch = self_in; char *ch_id = "AB"; // timer channel if (ch->channel == TIMER_A) { ch_id = "A"; } else if (ch->channel == TIMER_B) { ch_id = "B"; } mp_printf(print, "timer.channel(Timer.%s, %q=%u", ch_id, MP_QSTR_freq, ch->frequency); uint32_t mode = ch->timer->config & 0xFF; if (mode == TIMER_CFG_A_PWM) { mp_printf(print, ", %q=Timer.", MP_QSTR_polarity); switch (ch->polarity) { case PYBTIMER_POLARITY_POS: mp_printf(print, "POSITIVE"); break; case PYBTIMER_POLARITY_NEG: mp_printf(print, "NEGATIVE"); break; default: mp_printf(print, "BOTH"); break; } mp_printf(print, ", %q=%u.%02u", MP_QSTR_duty_cycle, ch->duty_cycle / 100, ch->duty_cycle % 100); } mp_printf(print, ")"); } STATIC mp_obj_t pyb_timer_channel_freq(mp_uint_t n_args, const mp_obj_t *args) { pyb_timer_channel_obj_t *ch = args[0]; if (n_args == 1) { // get return mp_obj_new_int(ch->frequency); } else { // set int32_t _frequency = mp_obj_get_int(args[1]); if (_frequency <= 0) { mp_raise_ValueError(mpexception_value_invalid_arguments); } ch->frequency = _frequency; ch->period = 1000000 / _frequency; timer_channel_init(ch); return mp_const_none; } } STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_freq_obj, 1, 2, pyb_timer_channel_freq); STATIC mp_obj_t pyb_timer_channel_period(mp_uint_t n_args, const mp_obj_t *args) { pyb_timer_channel_obj_t *ch = args[0]; if (n_args == 1) { // get return mp_obj_new_int(ch->period); } else { // set int32_t _period = mp_obj_get_int(args[1]); if (_period <= 0) { mp_raise_ValueError(mpexception_value_invalid_arguments); } ch->period = _period; ch->frequency = 1000000 / _period; timer_channel_init(ch); return mp_const_none; } } STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_period_obj, 1, 2, pyb_timer_channel_period); STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *args) { pyb_timer_channel_obj_t *ch = args[0]; if (n_args == 1) { // get return mp_obj_new_int(ch->duty_cycle); } else { // duty cycle must be converted from percentage to ticks // calculate the period, the prescaler and the match value uint32_t period_c; uint32_t match; ch->duty_cycle = MIN(10000, MAX(0, mp_obj_get_int(args[1]))); compute_prescaler_period_and_match_value(ch, &period_c, &match); if (n_args == 3) { // set the new polarity if requested ch->polarity = mp_obj_get_int(args[2]); MAP_TimerControlLevel(ch->timer->timer, ch->channel, (ch->polarity == PYBTIMER_POLARITY_NEG) ? true : false); } MAP_TimerMatchSet(ch->timer->timer, ch->channel, match); MAP_TimerPrescaleMatchSet(ch->timer->timer, ch->channel, match >> 16); return mp_const_none; } } STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_duty_cycle_obj, 1, 3, pyb_timer_channel_duty_cycle); STATIC mp_obj_t pyb_timer_channel_irq (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { mp_arg_val_t args[mp_irq_INIT_NUM_ARGS]; mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, mp_irq_INIT_NUM_ARGS, mp_irq_init_args, args); pyb_timer_channel_obj_t *ch = pos_args[0]; // convert the priority to the correct value uint priority = mp_irq_translate_priority (args[1].u_int); // validate the power mode uint8_t pwrmode = (args[3].u_obj == mp_const_none) ? PYB_PWR_MODE_ACTIVE : mp_obj_get_int(args[3].u_obj); if (pwrmode != PYB_PWR_MODE_ACTIVE) { goto invalid_args; } // get the trigger uint trigger = mp_obj_get_int(args[0].u_obj); // disable the callback first pyb_timer_channel_irq_disable(ch); uint8_t shift = (ch->channel == TIMER_B) ? 8 : 0; uint32_t _config = (ch->channel == TIMER_B) ? ((ch->timer->config & TIMER_B) >> 8) : (ch->timer->config & TIMER_A); switch (_config) { case TIMER_CFG_A_ONE_SHOT_UP: case TIMER_CFG_A_PERIODIC_UP: ch->timer->irq_trigger |= TIMER_TIMA_TIMEOUT << shift; if (trigger != PYBTIMER_TIMEOUT_TRIGGER) { goto invalid_args; } break; case TIMER_CFG_A_PWM: // special case for the PWM match interrupt ch->timer->irq_trigger |= ((ch->channel & TIMER_A) == TIMER_A) ? TIMER_TIMA_MATCH : TIMER_TIMB_MATCH; if (trigger != PYBTIMER_MATCH_TRIGGER) { goto invalid_args; } break; default: break; } // special case for a 32-bit timer if (ch->channel == (TIMER_A | TIMER_B)) { ch->timer->irq_trigger |= (ch->timer->irq_trigger << 8); } void (*pfnHandler)(void); uint32_t intregister; switch (ch->timer->timer) { case TIMERA0_BASE: if (ch->channel == TIMER_B) { pfnHandler = &TIMER0BIntHandler; intregister = INT_TIMERA0B; } else { pfnHandler = &TIMER0AIntHandler; intregister = INT_TIMERA0A; } break; case TIMERA1_BASE: if (ch->channel == TIMER_B) { pfnHandler = &TIMER1BIntHandler; intregister = INT_TIMERA1B; } else { pfnHandler = &TIMER1AIntHandler; intregister = INT_TIMERA1A; } break; case TIMERA2_BASE: if (ch->channel == TIMER_B) { pfnHandler = &TIMER2BIntHandler; intregister = INT_TIMERA2B; } else { pfnHandler = &TIMER2AIntHandler; intregister = INT_TIMERA2A; } break; default: if (ch->channel == TIMER_B) { pfnHandler = &TIMER3BIntHandler; intregister = INT_TIMERA3B; } else { pfnHandler = &TIMER3AIntHandler; intregister = INT_TIMERA3A; } break; } // register the interrupt and configure the priority MAP_IntPrioritySet(intregister, priority); MAP_TimerIntRegister(ch->timer->timer, ch->channel, pfnHandler); // create the callback mp_obj_t _irq = mp_irq_new (ch, args[2].u_obj, &pyb_timer_channel_irq_methods); // enable the callback before returning pyb_timer_channel_irq_enable(ch); return _irq; invalid_args: mp_raise_ValueError(mpexception_value_invalid_arguments); } STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_timer_channel_irq_obj, 1, pyb_timer_channel_irq); STATIC const mp_map_elem_t pyb_timer_channel_locals_dict_table[] = { // instance methods { MP_OBJ_NEW_QSTR(MP_QSTR_freq), (mp_obj_t)&pyb_timer_channel_freq_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_period), (mp_obj_t)&pyb_timer_channel_period_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_duty_cycle), (mp_obj_t)&pyb_timer_channel_duty_cycle_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_irq), (mp_obj_t)&pyb_timer_channel_irq_obj }, }; STATIC MP_DEFINE_CONST_DICT(pyb_timer_channel_locals_dict, pyb_timer_channel_locals_dict_table); STATIC const mp_obj_type_t pyb_timer_channel_type = { { &mp_type_type }, .name = MP_QSTR_TimerChannel, .print = pyb_timer_channel_print, .locals_dict = (mp_obj_t)&pyb_timer_channel_locals_dict, };