pico: add tufty2040 config

This is what the rotation/8bit changes were for

32blit-pico/board/tufty2040/config.cmake

@@ -0,0 +1,8 @@
+set(BLIT_BOARD_NAME "Tufty 2040")
+
+set(BLIT_BOARD_DEFINITIONS
+    PICO_FLASH_SIZE_BYTES=8388608
+)
+
+blit_driver(display st7789)
+blit_driver(input tufty)

32blit-pico/board/tufty2040/config.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#define DISPLAY_WIDTH 320
+
+
+
+#define ST7789_8BIT
+#define ST7789_ROTATE_180
+#define LCD_CS_PIN 10
+#define LCD_DC_PIN 11
+#define LCD_SCK_PIN 12 // WR
+#define LCD_RD_PIN 13
+#define LCD_MOSI_PIN 14 // DB0
+#define LCD_BACKLIGHT_PIN 2
+// #define LCD_VSYNC_PIN 11 // shared
+
+// there is a white LED

32blit-pico/input_tufty.cpp

@@ -0,0 +1,63 @@
+#include "input.hpp"
+
+#include "hardware/gpio.h"
+
+#include "pico/binary_info.h"
+
+#include "engine/api_private.hpp"
+#include "engine/input.hpp"
+
+enum class ButtonIO {
+  UP = 22,
+  DOWN = 6,
+
+  A = 7,
+  B = 8,
+  C = 9,
+  USER = 23, // USER_SW
+};
+
+static void init_button(ButtonIO b) {
+  int gpio = static_cast<int>(b);
+  gpio_set_function(gpio, GPIO_FUNC_SIO);
+  gpio_set_dir(gpio, GPIO_IN);
+  gpio_pull_down(gpio);
+}
+
+inline bool get_button(ButtonIO b) {
+  auto gpio = static_cast<int>(b);
+
+  if(b == ButtonIO::USER) // USER_SW goes the other way
+    return !gpio_get(gpio);
+
+  return gpio_get(gpio);
+}
+
+void init_input() {
+  init_button(ButtonIO::UP);
+  init_button(ButtonIO::DOWN);
+  init_button(ButtonIO::A);
+  init_button(ButtonIO::B);
+  init_button(ButtonIO::C);
+  init_button(ButtonIO::USER);
+
+  #define BUTTON_DECL(btn) bi_decl(bi_1pin_with_name(static_cast<int>(ButtonIO::btn), #btn" Button"));
+  BUTTON_DECL(UP)
+  BUTTON_DECL(DOWN)
+  BUTTON_DECL(A)
+  BUTTON_DECL(B)
+  BUTTON_DECL(C)
+  BUTTON_DECL(USER)
+  #undef BUTTON_DECL
+}
+
+void update_input() {
+  using namespace blit;
+
+  api.buttons = (get_button(ButtonIO::UP)    ? uint32_t(Button::DPAD_UP) : 0)
+              | (get_button(ButtonIO::DOWN)  ? uint32_t(Button::DPAD_DOWN) : 0)
+              | (get_button(ButtonIO::A)     ? uint32_t(Button::A) : 0)
+              | (get_button(ButtonIO::B)     ? uint32_t(Button::B) : 0)
+              | (get_button(ButtonIO::C)     ? uint32_t(Button::X) : 0)
+              | (get_button(ButtonIO::USER)  ? uint32_t(Button::Y) : 0);
+}