Read button state from display driver

drivers/dv_display/dv_display.cpp

@@ -52,6 +52,14 @@ namespace pimoroni {
     gpio_put(RAM_SEL, bank);
   }
 
+  uint8_t DVDisplay::get_driver_gpio() {
+    return i2c.reg_read_uint8(I2C_ADDR, I2C_REG_GPIO);
+  }
+
+  uint8_t DVDisplay::get_driver_gpio_hi() {
+    return i2c.reg_read_uint8(I2C_ADDR, I2C_REG_GPIO_HI);
+  }
+
   void DVDisplay::write(uint32_t address, size_t len, const uint16_t colour)
   {
     uint32_t val = colour | ((uint32_t)colour << 16);

drivers/dv_display/dv_display.hpp

@@ -37,6 +37,8 @@ namespace pimoroni {
     // I2C
     static constexpr uint I2C_ADDR = 0x0D;
     static constexpr uint I2C_REG_START = 0xF9;
+    static constexpr uint I2C_REG_GPIO = 0xC0;
+    static constexpr uint I2C_REG_GPIO_HI = 0xC8;
     
     static constexpr uint32_t base_address = 0x10000;
     uint16_t width = 0;
@@ -91,6 +93,12 @@ namespace pimoroni {
       void init();
       void flip();
 
+      uint8_t get_driver_gpio();
+      uint8_t get_driver_gpio_hi();
+
+      bool is_button_b_pressed() { return (get_driver_gpio() & 0x1) != 0x1; }
+      bool is_button_c_pressed() { return (get_driver_gpio() & 0x2) != 0x2; }
+
     private:
       static constexpr int PIXEL_BUFFER_LEN_IN_WORDS = 16;
       uint32_t pixel_buffer[PIXEL_BUFFER_LEN_IN_WORDS];

examples/dv_stick/dv_stick_test.cpp

@@ -56,6 +56,7 @@ int main() {
   display.flip();
 
   printf("Starting\n");
+  graphics.set_font("bitmap8");
 
   constexpr int NUM_CIRCLES = 50;
   struct Circle {
@@ -86,12 +87,14 @@ int main() {
       }
     }
 
+#if 0
     for (uint i = 0; i < 128; i++) {
       for (uint j = 0; j < 256; j++) {
         graphics.set_pen((j << 7) | i);
         graphics.pixel(Point(i, j+128));
       }
     }
+#endif
 
     for(int i =0 ; i < NUM_CIRCLES ; i++)
     {
@@ -124,6 +127,14 @@ int main() {
 
     uint32_t render_time = time_us_32() - render_start_time;
 
+    char buffer[8];
+    sprintf(buffer, "%s %s %s", 
+            gpio_get(BUTTON_A) == 0 ? "A" : " ", 
+            display.is_button_b_pressed() ? "B" : " ",
+            display.is_button_c_pressed() ? "C" : " ");
+    graphics.set_pen(0);
+    graphics.text(buffer, {500,10}, FRAME_WIDTH - 500, 3);
+
     uint32_t flip_start_time = time_us_32();
     display.flip();
     uint32_t flip_time = time_us_32() - flip_start_time;