Ability to choose the resolution for the display

drivers/dv_display/dv_display.cpp

@@ -1,6 +1,6 @@
 #include "dv_display.hpp"
 #include "swd_load.hpp"
-#include "pico-stick.h"
+#include "pico-stick-wide.h"
 
 #include <cstdlib>
 #include <math.h>
@@ -9,6 +9,31 @@
 namespace pimoroni {
 
   void DVDisplay::init() {
+    uint8_t mode = 0xFF;
+    if (width == 640) {
+      mode = 0;
+    }
+    else if (width == 720) {
+      if (height == 480) mode = 1;
+      else if (height == 400) mode = 2;
+      else if (height == 576) mode = 3;
+    }
+    else if (width == 800) {
+      if (height == 600) mode = 0x10;
+      else if (height == 480) mode = 0x11;
+      else if (height == 450) mode = 0x12;
+    }
+    else if (width == 960) {
+      if (height == 540) mode = 0x14;
+    }
+    else if (width == 1280) {
+      if (height == 720) mode = 0x15;
+    }
+
+    if (mode == 0xFF) {
+      printf("Resolution %dx%d is not supported.  Will use 720x480.\n", width, height);
+    }
+
     gpio_init(RAM_SEL);
     gpio_put(RAM_SEL, 0);
     gpio_set_dir(RAM_SEL, GPIO_OUT);
@@ -31,13 +56,12 @@ namespace pimoroni {
     sleep_ms(100);
 
     printf("Start I2C\n");
-    //i2c_init(i2c0, 100000);
-    //gpio_set_function(I2C_SDA, GPIO_FUNC_I2C); gpio_pull_up(I2C_SDA);
-    //gpio_set_function(I2C_SCL, GPIO_FUNC_I2C); gpio_pull_up(I2C_SCL);
+
+    if (mode != 0xFF) {
+      i2c.reg_write_uint8(I2C_ADDR, I2C_REG_SET_RES, mode);
+    }
 
     i2c.reg_write_uint8(I2C_ADDR, I2C_REG_START, 1);
-    //uint8_t i2c_cmd[] = {I2C_REG_START, 1};
-    //i2c_write_blocking(i2c0, I2C_ADDR, i2c_cmd, 2, false);
     printf("Started\n");
   }
   

drivers/dv_display/dv_display.hpp

@@ -36,6 +36,7 @@ namespace pimoroni {
 
     // I2C
     static constexpr uint I2C_ADDR = 0x0D;
+    static constexpr uint I2C_REG_SET_RES = 0xF8;
     static constexpr uint I2C_REG_START = 0xF9;
     static constexpr uint I2C_REG_GPIO = 0xC0;
     static constexpr uint I2C_REG_GPIO_HI = 0xC8;
@@ -46,7 +47,11 @@ namespace pimoroni {
     uint8_t bank = 0;
 
   public:
-    DVDisplay(uint16_t width, uint16_t height) 
+    // Valid resolutions are:
+    //   640x480 (60Hz), 720x480 (60Hz), 720x400 (70Hz), 720x576 (50Hz)
+    //   800x600 (60Hz), 800x480 (60Hz), 800x450 (60Hz), 960x540 (50Hz), 1280x720 (30Hz)
+    // Note resolutions on the second line require quite extreme overclocking and may not work on all hardware.
+    DVDisplay(uint16_t width, uint16_t height)
       : ram(CS, D0)
       , i2c(I2C_SDA, I2C_SCL)
       , width(width), height(height)

examples/dv_stick/dv_slideshow.cpp

@@ -12,8 +12,8 @@
 
 using namespace pimoroni;
 
-#define FRAME_WIDTH 720
-#define FRAME_HEIGHT 480
+#define FRAME_WIDTH 1280
+#define FRAME_HEIGHT 720
 
 FATFS fs;
 FRESULT fr;
@@ -146,12 +146,13 @@ int main() {
   auto dir = new DIR();
   bool first = true;
   constexpr int ms_per_image = 5000;
+  const TCHAR* dirname = "/images720/";
   while (1) {
-    f_opendir(dir, "/images/");
+    f_opendir(dir, dirname);
     while(f_readdir(dir, &file) == FR_OK && file.fname[0]) {
         printf("- %s %lld\n", file.fname, file.fsize);
 
-        draw_jpeg(std::string("/images/") + file.fname);
+        draw_jpeg(std::string(dirname) + file.fname);
 
         if (!first) {
           for (int w = 0; w < ms_per_image && gpio_get(BUTTON_A) == 1; w += 10) {