如何修复 ESP32 rmt: rmt_transmit(466): loop count is not supported

如果你在 ESP32 上遇到

rmt_transmit_error.txt

rmt: rmt_transmit(466): loop count is not supported

rmt: rmt_transmit(466): loop count is not supported

这是因为你使用了显式设置 loop_count 的 rmt_transmit_config_t。

rmt_cfg_with_loop.cpp

rmt_transmit_config_t cfg = {
  .loop_count = 1,
  .flags = {
        .eot_level = 0,
    }
};
ESP_ERROR_CHECK(rmt_transmit(/* ... */, &cfg));

rmt_transmit_config_t cfg = {
  .loop_count = 1,
  .flags = {
        .eot_level = 0,
    }
};
ESP_ERROR_CHECK(rmt_transmit(/* ... */, &cfg));

但你的 IC（如 ESP32-D0WD-V3）不支持硬件循环模式。

修复很简单：只需注释掉 .loop_count 行：

rmt_cfg_without_loop.cpp

rmt_transmit_config_t cfg = {
  //.loop_count = 1, // DISABLED as chip does not support it
  .flags = {
        .eot_level = 0,
    }
};
ESP_ERROR_CHECK(rmt_transmit(/* ... */, &cfg));

rmt_transmit_config_t cfg = {
  //.loop_count = 1, // DISABLED as chip does not support it
  .flags = {
        .eot_level = 0,
    }
};
ESP_ERROR_CHECK(rmt_transmit(/* ... */, &cfg));

注意，如果你将 .loop_count 保留为默认值，它将始终像 .loop_count = 1 一样工作。

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