ESP32 RMT " sync manager not supported"

[horace99]

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

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1. #include <stdio.h>
2. #include <stdbool.h>
3. #include <unistd.h>
4. // ESP32 RMT 1KHz three phase square wave  sync test
5.  
6. // on ESP32 the ESP32S3 code gives message
7. // ESP32S3 RMT !KHz three phase sync test
8. // setting up channel 0
9. // E (324) rmt: rmt_new_tx_channel(247): mem_block_symbols must be even and at least 64
10. // ESP_ERROR_CHECK failed: esp_err_t 0x102 (ESP_ERR_INVALID_ARG) at 0x400d631e
11.  
12.  
13. #include "driver/rmt_tx.h"
14.  
15. void app_main(void)
16. {
17. //    while (true) {
18.  //       printf("Hello from app_main!\n");
19.  //       sleep(1);
20.  //   }
21.  printf("ESP32 RMT !KHz three phase sync test\n");
22.   //delay(2000);
23.   // setup Tx channels
24.   rmt_channel_handle_t tx_channels[3] = { NULL };
25.   gpio_num_t tx_gpio_number[3] = { GPIO_NUM_16, GPIO_NUM_17, GPIO_NUM_18 };  // pin numbers
26.   for (int i = 0; i < 3; i++) {
27.     printf("setting up channel %d\n", i);
28.     rmt_tx_channel_config_t tx_chan_config = {
29.       .gpio_num = tx_gpio_number[i],
30.       .clk_src = RMT_CLK_SRC_DEFAULT,
31.       .resolution_hz = 1 * 1000 * 1000,  // 1MHz clock
32. //#if 0
33.       .mem_block_symbols = 64,        // for ESP32
34. //#endif
35.  //     .mem_block_symbols = 48,    
36.        .trans_queue_depth = 1,
37.     };
38.     ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &tx_channels[i]));
39.   }
40.   rmt_transmit_config_t transmitConfig = {
41.     .loop_count = -1
42.   };
43.   rmt_encoder_handle_t copyEncoder =NULL;
44.   rmt_copy_encoder_config_t copyEncoderConfig = {};
45.   assert(rmt_new_copy_encoder(&copyEncoderConfig, &copyEncoder) == ESP_OK && "Failed to Create Copy Encoder");
46.   ESP_ERROR_CHECK(rmt_enable(tx_channels[2]));
47.   ESP_ERROR_CHECK(rmt_enable(tx_channels[1]));
48.   ESP_ERROR_CHECK(rmt_enable(tx_channels[0]));
49.  
50.   // setup sync manage for the three pulses
51.   rmt_sync_manager_handle_t synchro = NULL;
52.   rmt_sync_manager_config_t synchro_config = {
53.     .tx_channel_array = tx_channels,
54.     .array_size = sizeof(tx_channels) / sizeof(tx_channels[0]),
55.   };
56.   ESP_ERROR_CHECK(rmt_new_sync_manager(&synchro_config, &synchro));
57.  
58.   printf("Starting Transmitters\n");
59.   // setup pulse patterns - clock is 1MHz
60.   // two 200KHz pulses 40% duty cycle
61.   const rmt_symbol_word_t pulsePattern1[] = {
62.     { .duration0 = 500, .level0 = 1, .duration1 = 500, .level1 = 0 },
63.   };
64.   const rmt_symbol_word_t pulsePattern2[] = {
65.     { .duration0 = 333, .level0 = 0, .duration1 = 500, .level1 = 1 },
66.     { .duration0 = 100, .level0 = 0, .duration1 = 67, .level1 = 0 },
67.   };
68.     const rmt_symbol_word_t pulsePattern3[] = {
69.     { .duration0 = 133, .level0 = 1, .duration1 = 500, .level1 = 0 },
70.     { .duration0 = 100, .level0 = 1, .duration1 = 267, .level1 = 1 },
71.   };
72.  
73.   assert(rmt_transmit(tx_channels[0], copyEncoder, &pulsePattern1, sizeof(pulsePattern1), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
74.   assert(rmt_transmit(tx_channels[1], copyEncoder, &pulsePattern2, sizeof(pulsePattern2), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
75.   assert(rmt_transmit(tx_channels[2], copyEncoder, &pulsePattern3, sizeof(pulsePattern3), &transmitConfig) == ESP_OK && "Failed to begin transmitting");
76.   printf("Transmitters Running\n");
77. }

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terminal displays

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1. ESP32 RMT !KHz three phase sync test
2. setting up channel 0
3. I (324) gpio: GPIO[16]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
4. setting up channel 1
5. I (334) gpio: GPIO[17]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
6. setting up channel 2
7. I (344) gpio: GPIO[18]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
8. E (354) rmt: rmt_new_sync_manager(400): sync manager not supported
9. ESP_ERROR_CHECK failed: esp_err_t 0x106 (ESP_ERR_NOT_SUPPORTED) at 0x400d63b3
10. file: "./main/main.c" line 56
11. func: app_main
12. expression: rmt_new_sync_manager(&synchro_config, &synchro)
13.  
14. abort() was called at PC 0x40085dbf on core 0

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is the sync manager not supported on the ESP32?

[nopnop2002]

>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

[horace99]

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

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