Merge pull request #218 from ProgramMax/main

Improve ST7789 frame rate ~4x

drivers/st7789/st7789.hpp

@@ -29,7 +29,9 @@ namespace pimoroni {
     uint bl     = SPI_BG_FRONT_PWM;
     uint vsync  = PIN_UNUSED; // only available on some products
 
-    static const uint32_t SPI_BAUD = 16 * 1000 * 1000;
+    // The ST7789 requires 16 ns between SPI rising edges.
+    // 16 ns = 62,500,000 Hz
+    static const uint32_t SPI_BAUD = 62'500'000;
 
   public:
     // frame buffer where pixel data is stored

libraries/pico_display_2/pico_display_2.cpp

@@ -49,7 +49,7 @@ namespace pimoroni {
     gpio_set_function(Y, GPIO_FUNC_SIO); gpio_set_dir(Y, GPIO_IN); gpio_pull_up(Y);
 
     // initialise the screen
-    screen.init(true, false, 74 * 1000 * 1000);
+    screen.init(true, false);
   }
 
   void PicoDisplay2::update() {