1. 05 Nov, 2022 2 commits
    • Bodmer's avatar
      Update ILI9481 init code as in #2120 · f02b09a3
      Bodmer authored
      f02b09a3
    • Bodmer's avatar
      Add ability to set the RP2040 parallel interface speed · 3c6dab0a
      Bodmer authored
      // For RP2040 processor and 8 or 16 bit parallel displays:
      // The parallel interface write cycle period is derived from a division of the CPU clock
      // speed so scales with the processor clock. This means that the divider ratio may need
      // to be increased when overclocking. I may also need to be adjusted dependant on the
      // display controller type (ILI94341, HX8357C etc). If RP2040_PIO_CLK_DIV is not defined
      // the library will set default values which may not suit your display.
      // The display controller data sheet will specify the minimum write cycle period. The
      // controllers often work reliably for shorter periods, however if the period is too short
      // the display may not initialise or graphics will become corrupted.
      // PIO write cycle frequency = (CPU clock/(4 * RP2040_PIO_CLK_DIV))
      //#define RP2040_PIO_CLK_DIV 1 // 32ns write cycle at 125MHz CPU clock
      #define RP2040_PIO_CLK_DIV 2 // 64ns write cycle at 125MHz CPU clock
      //#define RP2040_PIO_CLK_DIV 3 // 96ns write cycle at 125MHz CPU clock
      3c6dab0a
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