minor fixes

src/platforms/esp32c6/dma_parallel_io.cpp

@@ -1,7 +1,10 @@
 #include "dma_parallel_io.hpp"
+#include <Arduino.h>
 
 #ifdef CONFIG_IDF_TARGET_ESP32C6
 
+#pragma message "Compiling for ESP32-C6"
+
 //First implementation might have a lot of bugs, especially on deleting and reloading
 
 //major test setup:
@@ -33,8 +36,6 @@
 //     for a view clocks
 
 
-
-
 // limitation of parlio interface
 // PARLIO_LL_TX_MAX_BITS_PER_FRAME = (PARLIO_LL_TX_MAX_BYTES_PER_FRAME * 8)
 // PARLIO_LL_TX_MAX_BYTES_PER_FRAME = 0xFFFF
@@ -53,8 +54,6 @@
 //                                                                              I don't get it
 
 
-
-
 #pragma message "Compiling for ESP32-C6"
 
 #ifdef ARDUINO_ARCH_ESP32
@@ -81,19 +80,14 @@ DRAM_ATTR volatile bool previousBufferFree = true;
 IRAM_ATTR bool gdma_on_trans_eof_callback(gdma_channel_handle_t dma_chan,
                                           gdma_event_data_t *event_data, void *user_data)
 {
-
     //esp_rom_delay_us(100);
-
     previousBufferFree = true;
 
-
     //parlio_ll_tx_reset_fifo(&PARL_IO);
     parlio_ll_tx_reset_clock(&PARL_IO);
     
     //gdma_start(dma_chan, (intptr_t)&_dmadesc_a[0]);
-    
     //while (parlio_ll_tx_is_ready(&PARL_IO) == false);
-
     //parlio_ll_tx_start(&PARL_IO, true);
     //parlio_ll_tx_enable_clock(&PARL_IO, true);
 
@@ -110,6 +104,7 @@ void Bus_Parallel16::config(const config_t &cfg)
 
 bool Bus_Parallel16::init(void)
 {
+    ESP_LOGI("ESP32-C6", "Performing DMA bus init() for ESP-C6");
 
     periph_module_enable(PERIPH_PARLIO_MODULE);
     periph_module_reset (PERIPH_PARLIO_MODULE);
@@ -120,19 +115,18 @@ bool Bus_Parallel16::init(void)
 
     parlio_ll_clock_source_t clk_src = (parlio_ll_clock_source_t)PARLIO_CLK_SRC_DEFAULT;
     uint32_t periph_src_clk_hz = 0;
+
     esp_clk_tree_src_get_freq_hz((soc_module_clk_t)clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &periph_src_clk_hz);
     parlio_ll_tx_set_clock_source(&PARL_IO, clk_src);
+
     uint32_t div = (periph_src_clk_hz + _cfg.bus_freq - 1) / _cfg.bus_freq;
     parlio_ll_tx_set_clock_div(&PARL_IO, div);
     _cfg.bus_freq = periph_src_clk_hz / div;
 
-
     ESP_LOGI("C6", "Clock divider is %d", (int)div);
     ESP_LOGD("C6", "Resulting output clock frequency: %d Mhz", (int)(160000000L /  _cfg.bus_freq));
 
 
-
-
     // Allocate DMA channel and connect it to the LCD peripheral
     static gdma_channel_alloc_config_t dma_chan_config = {
         .sibling_chan = NULL,

src/platforms/esp32s3/gdma_lcd_parallel16.cpp

@@ -99,7 +99,7 @@
     //LCD_CAM.lcd_clock.clk_en = 0;             // Enable peripheral clock
 
     // LCD_CAM_LCD_CLK_SEL Select LCD module source clock. 0: clock source is disabled. 1: XTAL_CLK. 2: PLL_D2_CLK. 3: PLL_F160M_CLK. (R/W)
-    LCD_CAM.lcd_clock.lcd_clk_sel = 3;        // Use 160Mhz Clock Source
+    LCD_CAM.lcd_clock.lcd_clk_sel = 3;        // Use 160Mhz Clock Source -> PLL_F160M_CLK
     
     LCD_CAM.lcd_clock.lcd_ck_out_edge = 0;    // PCLK low in 1st half cycle
     LCD_CAM.lcd_clock.lcd_ck_idle_edge = 0;   // PCLK low idle
@@ -127,21 +127,21 @@
         //LCD_CAM.lcd_clock.lcd_clkm_div_num = 10; //16mhz is the fasted the Octal PSRAM can support it seems from faptastic's testing using an N8R8 variant (Octal SPI PSRAM).
         
         // https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-DMA/issues/441#issuecomment-1513631890
-        LCD_CAM.lcd_clock.lcd_clkm_div_num = 12; // 13Mhz is the fastest when the DMA memory is needed to service other peripherals as well.
+        LCD_CAM.lcd_clock.lcd_clkm_div_num = 12; // 13Mhz is about the fastest output from PSRAM if we want to be able to service other peripherals as well.
     }
     else
     {
 
       auto  freq     = (_cfg.bus_freq);
-
+      auto  _div_num = 20; // 8Mhzhz 
-      auto  _div_num = 8; // 20Mhz 
       if (freq < 20000000L) {
-            _div_num = 12; // 13Mhz
+            _div_num = 10; // 16Mhz
-      }
+      } else {
-      else if (freq > 20000000L) {
+            _div_num = 7; // 22Mhz --- likely to have noise without a good connection         
-            _div_num = 6; // 26Mhz --- likely to have noise without a good connection         
       }
       
+      _div_num = 6;
+
       //LCD_CAM.lcd_clock.lcd_clkm_div_num = lcd_clkm_div_num;      
       LCD_CAM.lcd_clock.lcd_clkm_div_num = _div_num; //3;