Merge pull request #9051 from tannewt/fix_h2

Fix RMT clock speed on H2

Author: dhalbert

ports/espressif/common-hal/neopixel_write/__init__.c

@@ -42,6 +42,7 @@
 
 #include "shared-bindings/neopixel_write/__init__.h"
 
+#include "esp_clk_tree.h"
 #include "py/mphal.h"
 #include "py/runtime.h"
 
@@ -61,10 +62,14 @@ static uint64_t next_start_raw_ticks = 0;
 
 void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout, uint8_t *pixels, uint32_t numBytes) {
     // Reserve channel
+    uint32_t clock_speed;
+    esp_clk_tree_src_get_freq_hz(RMT_CLK_SRC_DEFAULT,
+        ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED,
+        &clock_speed);
     rmt_tx_channel_config_t config = {
         .gpio_num = digitalinout->pin->number,
         .clk_src = RMT_CLK_SRC_DEFAULT,
-        .resolution_hz = 40000000,
+        .resolution_hz = clock_speed,
         .trans_queue_depth = 1,
     };
 
@@ -81,7 +86,7 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout,
     }
     CHECK_ESP_RESULT(result);
 
-    size_t ns_per_tick = 1e9 / 40000000;
+    size_t ns_per_tick = 1e9 / clock_speed;
     uint16_t ws2812_t0h_ticks = WS2812_T0H_NS / ns_per_tick;
     uint16_t ws2812_t0l_ticks = WS2812_T0L_NS / ns_per_tick;
     uint16_t ws2812_t1h_ticks = WS2812_T1H_NS / ns_per_tick;