prepare for Pimoroni Pico VGA

CMakeLists.txt

@@ -1,5 +1,9 @@
 cmake_minimum_required(VERSION 3.12)
+
+# Pull in PICO SDK (must be before project)
 include(pico_sdk_import.cmake)
+
+# We also need PICO EXTRAS
 include(pico_extras_import.cmake)
 
 project(picodvi C CXX ASM)
@@ -9,7 +13,6 @@ pico_sdk_init()
 
 add_compile_options(-Wall)
 
-
 set(DVI_DEFAULT_SERIAL_CONFIG "pico_sock_cfg" CACHE STRING
 	"Select a default pin configuration from common_dvi_pin_configs.h")
 
@@ -19,7 +22,6 @@ include_directories(
 	${PICO_FOLDER}/PicoDVI/software/include
 )
 
-
 add_subdirectory(${PICO_FOLDER}/PicoDVI/software/libdvi "${CMAKE_CURRENT_BINARY_DIR}/libdvi")
 add_subdirectory(${PICO_FOLDER}/PicoDVI/software/libsprite "${CMAKE_CURRENT_BINARY_DIR}/libsprite")
 add_subdirectory(${PICO_FOLDER}/pico-vga-332/ "${CMAKE_CURRENT_BINARY_DIR}/pico-vga-332")

pico_sdk_import.cmake

@@ -3,8 +3,6 @@
 # This can be dropped into an external project to help locate this SDK
 # It should be include()ed prior to project()
 
-# todo document
-
 if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
     set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
     message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
@@ -20,8 +18,8 @@ if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_P
     message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
 endif ()
 
-set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the PICO SDK")
-set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of PICO SDK from git if not otherwise locatable")
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
 set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
 
 if (NOT PICO_SDK_PATH)
@@ -31,20 +29,31 @@ if (NOT PICO_SDK_PATH)
         if (PICO_SDK_FETCH_FROM_GIT_PATH)
             get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
         endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
             FetchContent_Declare(
                     pico_sdk
-                GIT_REPOSITORY git@asic-git.pitowers.org:projectmu/pico_sdk.git
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
                     GIT_TAG master
             )
+        endif ()
+
         if (NOT pico_sdk)
-            message("Downloading PICO SDK")
+            message("Downloading Raspberry Pi Pico SDK")
             FetchContent_Populate(pico_sdk)
             set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
         endif ()
         set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
     else ()
         message(FATAL_ERROR
-                "PICO SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
                 )
     endif ()
 endif ()
@@ -56,9 +65,9 @@ endif ()
 
 set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
 if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
-    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the PICO SDK")
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
 endif ()
 
-set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the PICO SDK" FORCE)
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
 
 include(${PICO_SDK_INIT_CMAKE_FILE})

src/picovga/CMakeLists.txt

@@ -42,6 +42,7 @@ target_link_libraries(ZxSpectrumPicoVga
   tinyusb_board
   hardware_pio
   hardware_pwm
+  pico_scanvideo_dpi
 )
 
 pico_enable_stdio_usb(ZxSpectrumPicoVga 0)

src/picovga/main.cpp

@@ -8,6 +8,9 @@
 #endif
 // TODO need a 16bit version
 // #include "vga.h"
+#include "pico/scanvideo.h"
+#include "pico/scanvideo/composable_scanline.h"
+#include "pico/sync.h"
 
 #include "ZxSpectrumPrepareRgb16Scanline.h"
 #include "PicoCharRendererVga16.h"
@@ -37,6 +40,7 @@
 
 #define LED_PIN 25
 #define SPK_PIN 9
+#define vga_mode vga_mode_640x320_60
 
 #define VREG_VSEL VREG_VOLTAGE_1_10