ESP32 Forum

Posted: **Thu Oct 17, 2024 8:48 am**

following on from post "ESP32S3 RMT "no free tx channels" opening third channel" https://esp32.com/viewtopic.php?f=13&t=42301 where a solution was found attempting to run code on an ESP32 with esp-idf-v5.3.1

Code: [Select all] [Expand/Collapse]

#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
// ESP32 RMT 1KHz three phase square wave  sync test
 
// on ESP32 the ESP32S3 code gives message
// ESP32S3 RMT !KHz three phase sync test
// setting up channel 0
// E (324) rmt: rmt_new_tx_channel(247): mem_block_symbols must be even and at least 64
// ESP_ERROR_CHECK failed: esp_err_t 0x102 (ESP_ERR_INVALID_ARG) at 0x400d631e
 
 
#include "driver/rmt_tx.h"
 
void app_main(void)
{
//    while (true) {
 //       printf("Hello from app_main!\n");
 //       sleep(1);
 //   }
 printf("ESP32 RMT !KHz three phase sync test\n");
  //delay(2000);
  // setup Tx channels
  rmt_channel_handle_t tx_channels[3] = { NULL };
  gpio_num_t tx_gpio_number[3] = { GPIO_NUM_16, GPIO_NUM_17, GPIO_NUM_18 };  // pin numbers
  for (int i = 0; i < 3; i++) {
    printf("setting up channel %d\n", i);
    rmt_tx_channel_config_t tx_chan_config = {
      .gpio_num = tx_gpio_number[i],
      .clk_src = RMT_CLK_SRC_DEFAULT,
      .resolution_hz = 1 * 1000 * 1000,  // 1MHz clock
//#if 0
      .mem_block_symbols = 64,        // for ESP32
//#endif
 //     .mem_block_symbols = 48,     
       .trans_queue_depth = 1,
    };
    ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &tx_channels[i]));
  }
  rmt_transmit_config_t transmitConfig = {
    .loop_count = -1
  };
  rmt_encoder_handle_t copyEncoder =NULL;
  rmt_copy_encoder_config_t copyEncoderConfig = {};
  assert(rmt_new_copy_encoder(&copyEncoderConfig, &copyEncoder) == ESP_OK && "Failed to Create Copy Encoder");
  ESP_ERROR_CHECK(rmt_enable(tx_channels[2]));
  ESP_ERROR_CHECK(rmt_enable(tx_channels[1]));
  ESP_ERROR_CHECK(rmt_enable(tx_channels[0]));
 
  // setup sync manage for the three pulses
  rmt_sync_manager_handle_t synchro = NULL;
  rmt_sync_manager_config_t synchro_config = {
    .tx_channel_array = tx_channels,
    .array_size = sizeof(tx_channels) / sizeof(tx_channels[0]),
  };
  ESP_ERROR_CHECK(rmt_new_sync_manager(&synchro_config, &synchro));
 
  printf("Starting Transmitters\n");
  // setup pulse patterns - clock is 1MHz
  // two 200KHz pulses 40% duty cycle
  const rmt_symbol_word_t pulsePattern1[] = {
    { .duration0 = 500, .level0 = 1, .duration1 = 500, .level1 = 0 },
  };
  const rmt_symbol_word_t pulsePattern2[] = {
    { .duration0 = 333, .level0 = 0, .duration1 = 500, .level1 = 1 },
    { .duration0 = 100, .level0 = 0, .duration1 = 67, .level1 = 0 },
  };
    const rmt_symbol_word_t pulsePattern3[] = {
    { .duration0 = 133, .level0 = 1, .duration1 = 500, .level1 = 0 },
    { .duration0 = 100, .level0 = 1, .duration1 = 267, .level1 = 1 },
  };
 
  assert(rmt_transmit(tx_channels[0], copyEncoder, &pulsePattern1, sizeof(pulsePattern1), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
  assert(rmt_transmit(tx_channels[1], copyEncoder, &pulsePattern2, sizeof(pulsePattern2), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
  assert(rmt_transmit(tx_channels[2], copyEncoder, &pulsePattern3, sizeof(pulsePattern3), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
  printf("Transmitters Running\n");
}

GeSHi © Codebox Plus Extension

terminal displays

Code: [Select all] [Expand/Collapse]

ESP32 RMT !KHz three phase sync test
setting up channel 0
I (324) gpio: GPIO[16]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
setting up channel 1
I (334) gpio: GPIO[17]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
setting up channel 2
I (344) gpio: GPIO[18]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
E (354) rmt: rmt_new_sync_manager(400): sync manager not supported
ESP_ERROR_CHECK failed: esp_err_t 0x106 (ESP_ERR_NOT_SUPPORTED) at 0x400d63b3
file: "./main/main.c" line 56
func: app_main
expression: rmt_new_sync_manager(&synchro_config, &synchro)
 
abort() was called at PC 0x40085dbf on core 0

GeSHi © Codebox Plus Extension

is the sync manager not supported on the ESP32?

Posted: **Thu Oct 17, 2024 10:57 am**

>is the sync manager not supported on the ESP32?

Yes.

ESP32 does not support sync manager.

Code: Select all

$ grep -rn "#define SOC_RMT_SUPPORT_TX_SYNCHRO" esp-idf/components/soc/*
esp32c3/include/soc/soc_caps.h:248:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32c5/mp/include/soc/soc_caps.h:314:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32c5/beta3/include/soc/soc_caps.h:319:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32c6/include/soc/soc_caps.h:316:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32c61/include/soc/soc_caps.h:311:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32h2/include/soc/soc_caps.h:310:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32p4/include/soc/soc_caps.h:380:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32s2/include/soc/soc_caps.h:264:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
esp32s3/include/soc/soc_caps.h:275:#define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously

Posted: **Thu Oct 17, 2024 11:48 am**

Thanks for confirming that the ESP32 does not support sync manager.

thought it worth checking in case it was something in my code

ESP32 Forum

ESP32 RMT " sync manager not supported"

ESP32 RMT " sync manager not supported"

Re: ESP32 RMT " sync manager not supported"

Re: ESP32 RMT " sync manager not supported"