From d0a29092b6f273e8f70eaddf1120718994c845ef Mon Sep 17 00:00:00 2001
From: Jeff Epler <jepler@gmail.com>
Date: Fri, 14 Mar 2025 14:19:15 -0500
Subject: [PATCH] WIP switching to pico-pio-usb

---
 CMakeLists.txt        | 7 +++++++
 include/tusb_config.h | 2 ++
 src/main.c            | 9 ++++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8878289..6a2c61e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,6 +51,10 @@ set(HSTX_D2P 19 CACHE STRING "HSTX D2+ PIN")
 option(USE_VGA_RES "Video uses VGA (640x480) resolution" OFF)
 set(VIDEO_PIN 18 CACHE STRING "VGA Video GPIO base pin (followed by VS, CLK, HS)")
 
+# Pins for PIO-based USB host
+set(PIN_USB_HOST_DP CACHE STRING "1")
+set(PIN_USB_HOST_DM CACHE STRING "2")
+
 # See below, -DMEMSIZE=<size in KB> will configure umac's memory size,
 # overriding defaults.
 
@@ -122,6 +126,9 @@ else()
 
 endif()
 
+add_compile_definitions(PIN_USB_HOST_DP=${PIN_USB_HOST_DP})
+add_compile_definitions(PIN_USB_HOST_DM=${PIN_USB_HOST_DM})
+
 if (TARGET tinyusb_device)
   add_executable(firmware
     src/main.c
diff --git a/include/tusb_config.h b/include/tusb_config.h
index ba1b92f..cbe8523 100644
--- a/include/tusb_config.h
+++ b/include/tusb_config.h
@@ -83,6 +83,8 @@
 // max device support (excluding hub device)
 #define CFG_TUH_DEVICE_MAX          (CFG_TUH_HUB ? 4 : 1) // hub typically has 4 ports
 
+#define CFG_TUH_RPI_PIO_USB   1
+
 //------------- HID -------------//
 #define CFG_TUH_HID_EPIN_BUFSIZE    64
 #define CFG_TUH_HID_EPOUT_BUFSIZE   64
diff --git a/src/main.c b/src/main.c
index e347cc3..42c18f6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -273,7 +273,14 @@ int     main()
         multicore_launch_core1(core1_main);
 
 	printf("Starting, init usb\n");
-        tusb_init();
+
+        pio_usb_configuration_t pio_cfg = PIO_USB_DEFAULT_CONFIG;
+        _Static_assert(PIN_USB_HOST_DP + 1 == PIN_USB_HOST_DM || PIN_USB_HOST_DP - 1 == PIN_USB_HOST_DM, "Permitted USB D+/D- configuration");
+        pio_cfg.pinout = PIN_USB_HOST_DP + 1 == PIN_USB_HOST_DM ? PIO_USB_PINOUT_DPDM : PIO_USB_PINOUT_DMDP;
+        pio_cfg.pin_dp = PIN_USB_HOST_DP;
+        tuh_configure(BOARD_TUH_RHPORT, TUH_CFGID_RPI_PIO_USB_CONFIGURATION, &pio_cfg);
+       
+        tuh_init(BOARD_TUH_RHPORT);
 
         /* This happens on core 0: */
 	while (true) {