github
/
micropython
mirror of https://github.com/micropython/micropython.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

cc3200: Finally fix the Timer class API. 

Properly calculate the period and the prescaler, this now allows to
set the PWM frequency down to 5Hz. Make Timer IDs go from 0 to 3.
Add the trigger definitions for the channel IRQ.
pull/1856/head
danicampora 9 years ago
parent
53fec1ef48
commit
ed8db2e371
2 changed files with 61 additions and 34 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 92
      cc3200/mods/pybtimer.c
  2. 3
      cc3200/qstrdefsport.h

92
cc3200/mods/pybtimer.c
View File

@ -60,7 +60,7 @@
///
/// Example usage to toggle an LED at a fixed frequency:
///
/// tim = pyb.Timer(4) # create a timer object using timer 4
/// tim = pyb.Timer(3) # create a timer object using timer 3
/// tim.init(mode=Timer.PERIODIC) # initialize it in periodic mode
/// tim_ch = tim.channel(Timer.A, freq=2) # configure channel A at a frequency of 2Hz
/// tim_ch.callback(handler=lambda t:led.toggle()) # toggle a LED on every cycle of the timer
@ -87,6 +87,10 @@
#define PYBTIMER_POLARITY_POS (0x01)
#define PYBTIMER_POLARITY_NEG (0x02)
#define PYBTIMER_TIMEOUT_TRIGGER (0x01)
#define PYBTIMER_MATCH_TRIGGER (0x02)
#define PYBTIMER_EVENT_TRIGGER (0x04)
#define PYBTIMER_SRC_FREQ_HZ HAL_FCPU_HZ
/******************************************************************************
@ -127,6 +131,7 @@ STATIC const mp_obj_type_t pyb_timer_channel_type;
******************************************************************************/
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);
@ -177,6 +182,8 @@ 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);
}
}
@ -184,6 +191,8 @@ 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) {
@ -191,8 +200,15 @@ STATIC void timer_disable (pyb_timer_obj_t *tim) {
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);
memset(&pyb_timer_obj[tim->id], 0, sizeof(pyb_timer_obj_t));
}
// computes prescaler period and match value so timer triggers at freq-Hz
@ -205,8 +221,10 @@ STATIC uint32_t compute_prescaler_period_and_match_value(pyb_timer_channel_obj_t
if (period_c == 0) {
goto error;
}
prescaler = period_c >> 16;
prescaler = period_c >> 16; // The prescaler is an extension of the timer counter
*period_out = period_c;
if (prescaler > 0xFF && maxcount == 0xFFFF) {
goto error;
}
@ -217,9 +235,6 @@ STATIC uint32_t compute_prescaler_period_and_match_value(pyb_timer_channel_obj_t
else {
*match_out = period_c - ((period_c * ch->duty_cycle) / 100);
}
if ((ch->timer->config & 0x0F) == TIMER_CFG_A_PWM && (*match_out > 0xFFFF)) {
goto error;
}
return prescaler;
error:
@ -250,6 +265,7 @@ STATIC void timer_channel_init (pyb_timer_channel_obj_t *ch) {
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);
}
// configure the event edge type if we are in such mode
else if ((ch->timer->config & 0x0F) == TIMER_CFG_A_CAP_COUNT || (ch->timer->config & 0x0F) == TIMER_CFG_A_CAP_TIME) {
@ -282,10 +298,10 @@ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
// timer mode
qstr mode_qst = MP_QSTR_PWM;
switch(mode) {
case TIMER_CFG_A_ONE_SHOT:
case TIMER_CFG_A_ONE_SHOT_UP:
mode_qst = MP_QSTR_ONE_SHOT;
break;
case TIMER_CFG_A_PERIODIC:
case TIMER_CFG_A_PERIODIC_UP:
mode_qst = MP_QSTR_PERIODIC;
break;
case TIMER_CFG_A_CAP_COUNT:
@ -297,7 +313,7 @@ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
default:
break;
}
mp_printf(print, "<Timer%u, mode=Timer.%q>", (tim->id + 1), mode_qst);
mp_printf(print, "Timer(%u, mode=Timer.%q)", (tim->id + 1), mode_qst);
}
/// \method init(mode, *, width)
@ -325,7 +341,7 @@ STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, co
// check the mode
uint32_t _mode = args[0].u_int;
if (_mode != TIMER_CFG_A_ONE_SHOT && _mode != TIMER_CFG_A_PERIODIC && _mode != TIMER_CFG_A_CAP_COUNT &&
if (_mode != TIMER_CFG_A_ONE_SHOT_UP && _mode != TIMER_CFG_A_PERIODIC_UP && _mode != TIMER_CFG_A_CAP_COUNT &&
_mode != TIMER_CFG_A_CAP_TIME && _mode != TIMER_CFG_A_PWM) {
goto error;
}
@ -336,7 +352,7 @@ STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, co
}
bool is16bit = (args[1].u_int == 16);
if (!is16bit && (_mode != TIMER_CFG_A_ONE_SHOT && _mode != TIMER_CFG_A_PERIODIC)) {
if (!is16bit && (_mode != TIMER_CFG_A_ONE_SHOT_UP && _mode != TIMER_CFG_A_PERIODIC_UP)) {
// 32-bit mode is only available when in free running modes
goto error;
}
@ -361,7 +377,7 @@ STATIC mp_obj_t pyb_timer_make_new(const mp_obj_type_t *type, mp_uint_t n_args,
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]) - 1;
int32_t timer_idx = mp_obj_get_int(args[0]);
if (timer_idx < 0 || timer_idx > (PYBTIMER_NUM_TIMERS - 1)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_resource_not_avaliable));
}
@ -478,9 +494,6 @@ STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp
timer_channel_init(ch);
// register it with the sleep module
pyb_sleep_add ((const mp_obj_t)ch, (WakeUpCB_t)timer_channel_init);
// add the timer to the list
pyb_timer_channel_add(ch);
@ -500,13 +513,16 @@ STATIC const mp_map_elem_t pyb_timer_locals_dict_table[] = {
// 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) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_PERIODIC), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_PERIODIC) },
{ 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_EDGE_COUNT), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_CAP_COUNT) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_EDGE_TIME), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_CAP_TIME) },
{ 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) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_EVENT), MP_OBJ_NEW_SMALL_INT(PYBTIMER_EVENT_TRIGGER) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_timer_locals_dict, pyb_timer_locals_dict_table);
@ -528,7 +544,6 @@ STATIC const mp_irq_methods_t pyb_timer_channel_irq_methods = {
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);
@ -574,13 +589,11 @@ STATIC void pyb_timer_channel_print(const mp_print_t *print, mp_obj_t self_in, m
// timer channel
if (ch->channel == TIMER_A) {
ch_id = "A";
}
else if (ch->channel == TIMER_B) {
} else if (ch->channel == TIMER_B) {
ch_id = "B";
}
mp_printf(print, "<%q %s, timer=%u, %q=%u", MP_QSTR_TimerChannel,
ch_id, (ch->timer->id + 1), MP_QSTR_freq, ch->frequency);
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_CAP_COUNT || mode == TIMER_CFG_A_CAP_TIME || mode == TIMER_CFG_A_PWM) {
@ -600,7 +613,7 @@ STATIC void pyb_timer_channel_print(const mp_print_t *print, mp_obj_t self_in, m
mp_printf(print, ", %q=%u", MP_QSTR_duty_cycle, ch->duty_cycle);
}
}
mp_printf(print, ">");
mp_printf(print, ")");
}
/// \method freq([value])
@ -658,11 +671,9 @@ STATIC mp_obj_t pyb_timer_channel_time(mp_uint_t n_args, const mp_obj_t *args) {
// get
value = (ch->channel == TIMER_B) ? HWREG(ch->timer->timer + TIMER_O_TBV) : HWREG(ch->timer->timer + TIMER_O_TAV);
// return the current timer value in microseconds
// substract value to period since we are always operating in count-down mode
uint32_t time_t = (1000 * (period_c - value)) / period_c;
uint32_t time_t = (1000 * value) / period_c;
return mp_obj_new_int((time_t * 1000) / ch->frequency);
}
else {
} else {
// set
value = (mp_obj_get_int(args[1]) * ((ch->frequency * period_c) / 1000)) / 1000;
if ((value > 0xFFFF) && (ch->timer->config & TIMER_CFG_SPLIT_PAIR)) {
@ -693,8 +704,7 @@ STATIC mp_obj_t pyb_timer_channel_event_time(mp_obj_t self_in) {
uint32_t match;
(void)compute_prescaler_period_and_match_value(ch, &period_c, &match);
uint32_t value = MAP_TimerValueGet(ch->timer->timer, ch->channel == (TIMER_A | TIMER_B) ? TIMER_A : ch->channel);
// substract value to period since we are always operating in count-down mode
uint32_t time_t = (1000 * (period_c - value)) / period_c;
uint32_t time_t = (1000 * value) / period_c;
return mp_obj_new_int((time_t * 1000) / ch->frequency);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_channel_event_time_obj, pyb_timer_channel_event_time);
@ -706,8 +716,7 @@ STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *a
if (n_args == 1) {
// get
return mp_obj_new_int(ch->duty_cycle);
}
else {
} else {
// duty cycle must be converted from percentage to ticks
// calculate the period, the prescaler and the match value
uint32_t period_c;
@ -720,13 +729,13 @@ STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *a
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);
/// \method irq(trigger, priority, handler, wake)
/// FIXME triggers!!
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);
@ -741,25 +750,40 @@ STATIC mp_obj_t pyb_timer_channel_irq (mp_uint_t n_args, const mp_obj_t *pos_arg
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:
case TIMER_CFG_A_PERIODIC:
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_CAP_COUNT:
ch->timer->irq_trigger |= TIMER_CAPA_MATCH << shift;
if (trigger != PYBTIMER_MATCH_TRIGGER) {
goto invalid_args;
}
break;
case TIMER_CFG_A_CAP_TIME:
ch->timer->irq_trigger |= TIMER_CAPA_EVENT << shift;
if (trigger != PYBTIMER_EVENT_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;

3
cc3200/qstrdefsport.h
View File

@ -377,6 +377,9 @@ Q(EDGE_TIME)
Q(PWM)
Q(POSITIVE)
Q(NEGATIVE)
Q(TIMEOUT)
Q(MATCH)
Q(EVENT)
// for uhashlib module
//Q(uhashlib)

Write Preview
Loading…
Cancel
Save