spi_lcd: make tjpgd example runnable on C2

examples/peripherals/lcd/tjpgd/README.md

@@ -1,5 +1,5 @@
-| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 |
-| ----------------- | ----- | -------- | -------- | -------- |
+| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 | ESP32-C2 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- |
 
 ## LCD tjpgd example
 

examples/peripherals/lcd/tjpgd/main/Kconfig.projbuild

@@ -7,4 +7,11 @@ menu "Example Configuration"
         help
             This option can be chosen when using 8-line lcd.
 
+    config EXAMPLE_LCD_FLUSH_PARALLEL_LINES
+        int "LCD flush parallel lines"
+        default 12 if IDF_TARGET_ESP32C2
+        default 16
+        help
+            To speed up transfers, every SPI transfer sends a bunch of lines.
+
 endmenu

examples/peripherals/lcd/tjpgd/main/lcd_tjpgd_example_main.c

@@ -5,6 +5,7 @@
  */
 
 #include <stdio.h>
+#include "sdkconfig.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "esp_lcd_panel_io.h"
@@ -20,7 +21,7 @@
 // To speed up transfers, every SPI transfer sends a bunch of lines. This define specifies how many.
 // More means more memory use, but less overhead for setting up / finishing transfers. Make sure 240
 // is dividable by this.
-#define PARALLEL_LINES 12
+#define PARALLEL_LINES CONFIG_EXAMPLE_LCD_FLUSH_PARALLEL_LINES
 // The number of frames to show before rotate the graph
 #define ROTATE_FRAME   30