fix(led_strip): Update LedStrip to support DMA (#583)

* fix(led_strip): Update LedStrip to support DMA

* Update components/led_strip/include/led_strip.hpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update components/led_strip/include/led_strip.hpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update components/led_strip/include/led_strip.hpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* improve led strip some more (dependent on logger change)

* fix sa?

* remove unneeded suppression

* address comments

* fix sa

* fix sa

* clean up refactor to use span instead of raw pointer+size

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: finger563

components/led_strip/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
   INCLUDE_DIRS "include"
   SRC_DIRS "src"
-  REQUIRES "base_component" "color"
+  REQUIRES "heap" "base_component" "color"
   )

components/led_strip/README.md

@@ -8,6 +8,16 @@ You can use it directly with an SPI driver to talk to APA102 LED strips, or you
 can use it with a RMT driver (such as the `Rmt` component) to talk to WS2812,
 WS2811, WS2813, SK6812, etc. LED strips.
 
+## Usage
+
+The Config struct accepts `std::span<const uint8_t>` for start and end frames,
+allowing efficient use of memory. For backwards compatibility, you can:
+
+- Use empty frames: `.start_frame = {}`
+- Use the predefined `LedStrip::APA102_START_FRAME` vector (auto-converts to span)
+- Use `std::array` with CTAD: `.start_frame = std::array{0x00, 0x00, 0x00, 0x00}`
+- Pass any existing vector or array that will be converted to a span
+
 ## Example
 
 The [example](./example) shows the use of the `LedStrip` class to control a 5x5

components/led_strip/example/main/led_strip_example.cpp

@@ -118,10 +118,14 @@ extern "C" void app_main(void) {
         });
 
     //! [led strip ex1]
-    // create the rmt object
+    // create the rmt object with DMA enabled for better performance
     espp::Rmt rmt(espp::Rmt::Config{
         .gpio_num = NEO_BFF_IO,
+        .clock_src = RMT_CLK_SRC_DEFAULT,
+        .dma_enabled = true,
+        .block_size = 1024,
         .resolution_hz = SK6805_FREQ_HZ,
+        .transaction_queue_depth = 2,
         .log_level = espp::Logger::Verbosity::INFO,
     });
 
@@ -138,14 +142,16 @@ extern "C" void app_main(void) {
       rmt.transmit(data, len);
     };
 
-    // now create the LedStrip object
+    // now create the LedStrip object with DMA support
     espp::LedStrip led_strip(espp::LedStrip::Config{
         .num_leds = NEO_BFF_NUM_LEDS,
         .write = neopixel_write,
         .send_brightness = false,
         .byte_order = espp::LedStrip::ByteOrder::GRB,
         .start_frame = {},
         .end_frame = {},
+        .use_dma = true,
+        .dma_allocation_flags = MALLOC_CAP_DMA,
         .log_level = espp::Logger::Verbosity::INFO,
     });