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esp32/esp32_rmt: Properly fix looping behaviour of RMT.

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A previous commit 3a9d948032 can cause
lock-ups of the RMT driver, so this commit reverses that, adds a loop_en
flag, and explicitly controls the TX interrupt in write_pulses().  This
provides correct looping, non-blocking writes and sensible behaviour for
wait_done().

See also #6167.
This commit is contained in:
Jonathan Hogg 2020-06-26 14:55:07 +01:00 committed by Damien George
parent 5264478007
commit 7dbef5377c
1 changed files with 28 additions and 2 deletions
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30
ports/esp32/esp32_rmt.c
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@ -56,6 +56,7 @@ typedef struct _esp32_rmt_obj_t {
uint32_t carrier_freq;
mp_uint_t num_items;
rmt_item32_t *items;
bool loop_en;
} esp32_rmt_obj_t;
STATIC mp_obj_t esp32_rmt_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
@ -93,6 +94,7 @@ STATIC mp_obj_t esp32_rmt_make_new(const mp_obj_type_t *type, size_t n_args, siz
self->clock_div = clock_div;
self->carrier_duty_percent = carrier_duty_percent;
self->carrier_freq = carrier_freq;
self->loop_en = false;
rmt_config_t config;
config.rmt_mode = RMT_MODE_TX;
@ -110,8 +112,8 @@ STATIC mp_obj_t esp32_rmt_make_new(const mp_obj_type_t *type, size_t n_args, siz
config.clk_div = self->clock_div;
check_esp_err(rmt_driver_install(config.channel, 0, 0));
check_esp_err(rmt_config(&config));
check_esp_err(rmt_driver_install(config.channel, 0, 0));
return MP_OBJ_FROM_PTR(self);
}
@ -180,7 +182,15 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp32_rmt_wait_done_obj, 1, esp32_rmt_wait_don
STATIC mp_obj_t esp32_rmt_loop(mp_obj_t self_in, mp_obj_t loop) {
esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(self_in);
check_esp_err(rmt_set_tx_loop_mode(self->channel_id, mp_obj_get_int(loop)));
self->loop_en = mp_obj_get_int(loop);
if (!self->loop_en) {
bool loop_en;
check_esp_err(rmt_get_tx_loop_mode(self->channel_id, &loop_en));
if (loop_en) {
check_esp_err(rmt_set_tx_loop_mode(self->channel_id, false));
check_esp_err(rmt_set_tx_intr_en(self->channel_id, true));
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(esp32_rmt_loop_obj, esp32_rmt_loop);
@ -222,8 +232,24 @@ STATIC mp_obj_t esp32_rmt_write_pulses(size_t n_args, const mp_obj_t *pos_args,
self->items[item_index].level1 = start++;
}
}
if (self->loop_en) {
bool loop_en;
check_esp_err(rmt_get_tx_loop_mode(self->channel_id, &loop_en));
if (loop_en) {
check_esp_err(rmt_set_tx_intr_en(self->channel_id, true));
check_esp_err(rmt_set_tx_loop_mode(self->channel_id, false));
}
check_esp_err(rmt_wait_tx_done(self->channel_id, portMAX_DELAY));
check_esp_err(rmt_set_tx_intr_en(self->channel_id, false));
}
check_esp_err(rmt_write_items(self->channel_id, self->items, num_items, false /* non-blocking */));
if (self->loop_en) {
check_esp_err(rmt_set_tx_loop_mode(self->channel_id, true));
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp32_rmt_write_pulses_obj, 2, esp32_rmt_write_pulses);