8000 Implement rmtLoop to be able to continuously send pulses (#3650) · escopecz/arduino-esp32@32d5654 · GitHub
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Implement rmtLoop to be able to continuously send pulses (espressif#3650)
Number of pulses is limited to the reserved RMT memory for the channel. Very useful for PWM, Servo and other repeatable signals.
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+26
-4
lines changed

2 files changed

+26
-4
lines changed

‎cores/esp32/esp32-hal-rmt.c

Lines changed: 20 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -128,7 +128,7 @@ static xSemaphoreHandle g_rmt_block_lock = NULL;
128128
*/
129129
static void _initPin(int pin, int channel, bool tx_not_rx);
130130

131-
static bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size);
131+
static bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size, bool continuous);
132132

133133
static void IRAM_ATTR _rmt_isr(void* arg);
134134

@@ -234,6 +234,21 @@ bool rmtDeinit(rmt_obj_t *rmt)
234234
return true;
235235
}
236236

237+
bool rmtLoop(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
238+
{
239+
if (!rmt) {
240+
return false;
241+
}
242+
243+
int channel = rmt->channel;
244+
int allocated_size = MAX_DATA_PER_CHANNEL * rmt->buffers;
245+
246+
if (size > allocated_size) {
247+
return false;
248+
}
249+
return _rmtSendOnce(rmt, data, size, true);
250+
}
251+
237252
bool rmtWrite(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
238253
{
239254
if (!rmt) {
@@ -282,10 +297,10 @@ bool rmtWrite(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
282297
RMT_MUTEX_UNLOCK(channel);
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284299
// start the transation
285-
return _rmtSendOnce(rmt, data, MAX_DATA_PER_ITTERATION);
300+
return _rmtSendOnce(rmt, data, MAX_DATA_PER_ITTERATION, false);
286301
} else {
287302
// use one-go mode if data fits one buffer
288-
return _rmtSendOnce(rmt, data, size);
303+
return _rmtSendOnce(rmt, data, size, false);
289304
}
290305
}
291306

@@ -553,7 +568,7 @@ rmt_obj_t* rmtInit(int pin, bool tx_not_rx, rmt_reserve_memsize_t memsize)
553568
/**
554569
* Private methods definitions
555570
*/
556-
bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
571+
bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size, bool continuous)
557572
{
558573
if (!rmt) {
559574
return false;
@@ -571,6 +586,7 @@ bool _rmtSendOnce(rmt_obj_t* rmt, rmt_data_t* data, size_t size)
571586
}
572587

573588
RMT_MUTEX_LOCK(channel);
589+
RMT.conf_ch[channel].conf1.tx_conti_mode = continuous;
574590
RMT.conf_ch[channel].conf1.mem_rd_rst = 1;
575591
RMT.conf_ch[channel].conf1.tx_start = 1;
576592
RMT_MUTEX_UNLOCK(channel);

‎cores/esp32/esp32-hal-rmt.h

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -73,6 +73,12 @@ float rmtSetTick(rmt_obj_t* rmt, float tick);
7373
*/
7474
bool rmtWrite(rmt_obj_t* rmt, rmt_data_t* data, size_t size);
7575

76+
/**
77+
* Loop data up to the reserved memsize continuously
78+
*
79+
*/
80+
bool rmtLoop(rmt_obj_t* rmt, rmt_data_t* data, size_t size);
81+
7682
/**
7783
* Initiates async receive, event flag indicates data received
7884
*

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