From 885bd922cfd02810a9ebe1d8a0e255226a472852 Mon Sep 17 00:00:00 2001
From: "Mr. Green's Workshop"
 <76992231+MrGreensWorkshop@users.noreply.github.com>
Date: Fri, 20 Jan 2023 07:49:00 +0900
Subject: [PATCH] Ability to set USB device as self powered device (#1105)

---
 src/rp2_common/pico_stdio_usb/include/pico/stdio_usb.h | 5 +++++
 src/rp2_common/pico_stdio_usb/stdio_usb_descriptors.c  | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/rp2_common/pico_stdio_usb/include/pico/stdio_usb.h b/src/rp2_common/pico_stdio_usb/include/pico/stdio_usb.h
index 565b6c3..8548169 100644
--- a/src/rp2_common/pico_stdio_usb/include/pico/stdio_usb.h
+++ b/src/rp2_common/pico_stdio_usb/include/pico/stdio_usb.h
@@ -102,6 +102,11 @@
 #define PICO_STDIO_USB_CONNECTION_WITHOUT_DTR 0
 #endif
 
+// PICO_CONFIG: PICO_STDIO_USB_DEVICE_SELF_POWERED, Set USB device as self powered device, type=bool, default=0, group=pico_stdio_usb
+#ifndef PICO_STDIO_USB_DEVICE_SELF_POWERED
+#define PICO_STDIO_USB_DEVICE_SELF_POWERED 0
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/src/rp2_common/pico_stdio_usb/stdio_usb_descriptors.c b/src/rp2_common/pico_stdio_usb/stdio_usb_descriptors.c
index e1babf8..c3ce49b 100644
--- a/src/rp2_common/pico_stdio_usb/stdio_usb_descriptors.c
+++ b/src/rp2_common/pico_stdio_usb/stdio_usb_descriptors.c
@@ -54,7 +54,13 @@
 #else
 #define USBD_DESC_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_RPI_RESET_DESC_LEN)
 #endif
+#if !PICO_STDIO_USB_DEVICE_SELF_POWERED
+#define USBD_CONFIGURATION_DESCRIPTOR_ATTRIBUTE (0)
 #define USBD_MAX_POWER_MA (250)
+#else
+#define USBD_CONFIGURATION_DESCRIPTOR_ATTRIBUTE TUSB_DESC_CONFIG_ATT_SELF_POWERED
+#define USBD_MAX_POWER_MA (1)
+#endif
 
 #define USBD_ITF_CDC       (0) // needs 2 interfaces
 #if !PICO_STDIO_USB_ENABLE_RESET_VIA_VENDOR_INTERFACE
@@ -102,7 +108,7 @@ static const tusb_desc_device_t usbd_desc_device = {
 
 static const uint8_t usbd_desc_cfg[USBD_DESC_LEN] = {
     TUD_CONFIG_DESCRIPTOR(1, USBD_ITF_MAX, USBD_STR_0, USBD_DESC_LEN,
-        0, USBD_MAX_POWER_MA),
+        USBD_CONFIGURATION_DESCRIPTOR_ATTRIBUTE, USBD_MAX_POWER_MA),
 
     TUD_CDC_DESCRIPTOR(USBD_ITF_CDC, USBD_STR_CDC, USBD_CDC_EP_CMD,
         USBD_CDC_CMD_MAX_SIZE, USBD_CDC_EP_OUT, USBD_CDC_EP_IN, USBD_CDC_IN_OUT_MAX_SIZE),