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| 1 | +/* |
| 2 | + * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. |
| 3 | + * |
| 4 | + * SPDX-License-Identifier: BSD-3-Clause |
| 5 | + */ |
| 6 | + |
| 7 | +#ifndef _PICO_STDIO_USB_H |
| 8 | +#define _PICO_STDIO_USB_H |
| 9 | + |
| 10 | +#include "pico/stdio.h" |
| 11 | + |
| 12 | +/** \brief Support for stdin/stdout over USB serial (CDC) |
| 13 | + * \defgroup pico_stdio_usb pico_stdio_usb |
| 14 | + * \ingroup pico_stdio |
| 15 | + * |
| 16 | + * Linking this library or calling `pico_enable_stdio_usb(TARGET ENABLED)` in the CMake (which |
| 17 | + * achieves the same thing) will add USB CDC to the drivers used for standard input/output |
| 18 | + * |
| 19 | + * Note this library is a developer convenience. It is not applicable in all cases; for one it takes full control of the USB device precluding your |
| 20 | + * use of the USB in device or host mode. For this reason, this library will automatically disengage if you try to using it alongside \ref tinyusb_device or |
| 21 | + * \ref tinyusb_host. It also takes control of a lower level IRQ and sets up a periodic background task. |
| 22 | + * |
| 23 | + * This library also includes (by default) functionality to enable the RP-series microcontroller to be reset over the USB interface. |
| 24 | + */ |
| 25 | + |
| 26 | +// PICO_CONFIG: PICO_STDIO_USB_DEFAULT_CRLF, Default state of CR/LF translation for USB output, type=bool, default=PICO_STDIO_DEFAULT_CRLF, group=pico_stdio_usb |
| 27 | +#ifndef PICO_STDIO_USB_DEFAULT_CRLF |
| 28 | +#define PICO_STDIO_USB_DEFAULT_CRLF PICO_STDIO_DEFAULT_CRLF |
| 29 | +#endif |
| 30 | + |
| 31 | +// PICO_CONFIG: PICO_STDIO_USB_STDOUT_TIMEOUT_US, Number of microseconds to be blocked trying to write USB output before assuming the host has disappeared and discarding data, default=500000, group=pico_stdio_usb |
| 32 | +#ifndef PICO_STDIO_USB_STDOUT_TIMEOUT_US |
| 33 | +#define PICO_STDIO_USB_STDOUT_TIMEOUT_US 500000 |
| 34 | +#endif |
| 35 | + |
| 36 | +// todo perhaps unnecessarily frequent? |
| 37 | +// PICO_CONFIG: PICO_STDIO_USB_TASK_INTERVAL_US, Period of microseconds between calling tud_task in the background, default=1000, advanced=true, group=pico_stdio_usb |
| 38 | +#ifndef PICO_STDIO_USB_TASK_INTERVAL_US |
| 39 | +#define PICO_STDIO_USB_TASK_INTERVAL_US 1000 |
| 40 | +#endif |
| 41 | + |
| 42 | +// PICO_CONFIG: PICO_STDIO_USB_LOW_PRIORITY_IRQ, Explicit User IRQ number to claim for tud_task() background execution instead of letting the implementation pick a free one dynamically (deprecated), advanced=true, group=pico_stdio_usb |
| 43 | +#ifndef PICO_STDIO_USB_LOW_PRIORITY_IRQ |
| 44 | +// this variable is no longer set by default (one is claimed dynamically), but will be respected if specified |
| 45 | +#endif |
| 46 | + |
| 47 | +// PICO_CONFIG: PICO_STDIO_USB_ENABLE_RESET_VIA_BAUD_RATE, Enable/disable resetting into BOOTSEL mode if the host sets the baud rate to a magic value (PICO_STDIO_USB_RESET_MAGIC_BAUD_RATE), type=bool, default=1 if application is not using TinyUSB directly, group=pico_stdio_usb |
| 48 | +#ifndef PICO_STDIO_USB_ENABLE_RESET_VIA_BAUD_RATE |
| 49 | +#if !defined(LIB_TINYUSB_HOST) && !defined(LIB_TINYUSB_DEVICE) |
| 50 | +#define PICO_STDIO_USB_ENABLE_RESET_VIA_BAUD_RATE 1 |
| 51 | +#endif |
| 52 | +#endif |
| 53 | + |
| 54 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_MAGIC_BAUD_RATE, Baud rate that if selected causes a reset into BOOTSEL mode (if PICO_STDIO_USB_ENABLE_RESET_VIA_BAUD_RATE is set), default=1200, group=pico_stdio_usb |
| 55 | +#ifndef PICO_STDIO_USB_RESET_MAGIC_BAUD_RATE |
| 56 | +#define PICO_STDIO_USB_RESET_MAGIC_BAUD_RATE 1200 |
| 57 | +#endif |
| 58 | + |
| 59 | +// PICO_CONFIG: PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS, Maximum number of milliseconds to wait during initialization for a CDC connection from the host (negative means indefinite) during initialization, default=0, group=pico_stdio_usb |
| 60 | +#ifndef PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS |
| 61 | +#define PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS 0 |
| 62 | +#endif |
| 63 | + |
| 64 | +// PICO_CONFIG: PICO_STDIO_USB_POST_CONNECT_WAIT_DELAY_MS, Number of extra milliseconds to wait when using PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS after a host CDC connection is detected (some host terminals seem to sometimes lose transmissions sent right after connection), default=50, group=pico_stdio_usb |
| 65 | +#ifndef PICO_STDIO_USB_POST_CONNECT_WAIT_DELAY_MS |
| 66 | +#define PICO_STDIO_USB_POST_CONNECT_WAIT_DELAY_MS 50 |
| 67 | +#endif |
| 68 | + |
| 69 | +// PICO_CONFIG: PICO_STDIO_USB_DEINIT_DELAY_MS, Number of milliseconds to wait before deinitializing stdio_usb, default=110, group=pico_stdio_usb |
| 70 | +#ifndef PICO_STDIO_USB_DEINIT_DELAY_MS |
| 71 | +#define PICO_STDIO_USB_DEINIT_DELAY_MS 110 |
| 72 | +#endif |
| 73 | + |
| 74 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_BOOTSEL_ACTIVITY_LED, Optionally define a pin to use as bootloader activity LED when BOOTSEL mode is entered via USB (either VIA_BAUD_RATE or VIA_VENDOR_INTERFACE), type=int, min=0, max=47 on RP2350B, 29 otherwise, group=pico_stdio_usb |
| 75 | + |
| 76 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_BOOTSEL_ACTIVITY_LED_ACTIVE_LOW, Whether pin to use as bootloader activity LED when BOOTSEL mode is entered via USB (either VIA_BAUD_RATE or VIA_VENDOR_INTERFACE) is active low, type=bool, default=0, group=pico_stdio_usb |
| 77 | +#ifndef PICO_STDIO_USB_RESET_BOOTSEL_FIXED_ACTIVITY_LED_ACTIVE_LOW |
| 78 | +#define PICO_STDIO_USB_RESET_BOOTSEL_FIXED_ACTIVITY_LED_ACTIVE_LOW 0 |
| 79 | +#endif |
| 80 | + |
| 81 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_BOOTSEL_FIXED_ACTIVITY_LED, Whether the pin specified by PICO_STDIO_USB_RESET_BOOTSEL_ACTIVITY_LED is fixed or can be modified by picotool over the VENDOR USB interface, type=bool, default=0, group=pico_stdio_usb |
| 82 | +#ifndef PICO_STDIO_USB_RESET_BOOTSEL_FIXED_ACTIVITY_LED |
| 83 | +#define PICO_STDIO_USB_RESET_BOOTSEL_FIXED_ACTIVITY_LED 0 |
| 84 | +#endif |
| 85 | + |
| 86 | +// Any modes disabled here can't be re-enabled by picotool via VENDOR_INTERFACE. |
| 87 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_BOOTSEL_INTERFACE_DISABLE_MASK, Optionally disable either the mass storage interface (bit 0) or the PICOBOOT interface (bit 1) when entering BOOTSEL mode via USB (either VIA_BAUD_RATE or VIA_VENDOR_INTERFACE), type=int, min=0, max=3, default=0, group=pico_stdio_usb |
| 88 | +#ifndef PICO_STDIO_USB_RESET_BOOTSEL_INTERFACE_DISABLE_MASK |
| 89 | +#define PICO_STDIO_USB_RESET_BOOTSEL_INTERFACE_DISABLE_MASK 0u |
| 90 | +#endif |
| 91 | + |
| 92 | +// PICO_CONFIG: PICO_STDIO_USB_ENABLE_RESET_VIA_VENDOR_INTERFACE, Enable/disable resetting into BOOTSEL mode via an additional VENDOR USB interface - enables picotool based reset, type=bool, default=1 if application is not using TinyUSB directly, group=pico_stdio_usb |
| 93 | +#ifndef PICO_STDIO_USB_ENABLE_RESET_VIA_VENDOR_INTERFACE |
| 94 | +#if !defined(LIB_TINYUSB_HOST) && !defined(LIB_TINYUSB_DEVICE) |
| 95 | +#define PICO_STDIO_USB_ENABLE_RESET_VIA_VENDOR_INTERFACE 1 |
| 96 | +#endif |
| 97 | +#endif |
| 98 | + |
| 99 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_BOOTSEL, If vendor reset interface is included allow rebooting to BOOTSEL mode, type=bool, default=1, group=pico_stdio_usb |
| 100 | +#ifndef PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_BOOTSEL |
| 101 | +#define PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_BOOTSEL 1 |
| 102 | +#endif |
| 103 | + |
| 104 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_FLASH_BOOT, If vendor reset interface is included allow rebooting with regular flash boot, type=bool, default=1, group=pico_stdio_usb |
| 105 | +#ifndef PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_FLASH_BOOT |
| 106 | +#define PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_RESET_TO_FLASH_BOOT 1 |
| 107 | +#endif |
| 108 | + |
| 109 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_MS_OS_20_DESCRIPTOR, If vendor reset interface is included add support for Microsoft OS 2.0 Descriptor, type=bool, default=1, group=pico_stdio_usb |
| 110 | +#ifndef PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_MS_OS_20_DESCRIPTOR |
| 111 | +#define PICO_STDIO_USB_RESET_INTERFACE_SUPPORT_MS_OS_20_DESCRIPTOR 1 |
| 112 | +#endif |
| 113 | + |
| 114 | +// PICO_CONFIG: PICO_STDIO_USB_RESET_RESET_TO_FLASH_DELAY_MS, Delay in ms before rebooting via regular flash boot, default=100, group=pico_stdio_usb |
| 115 | +#ifndef PICO_STDIO_USB_RESET_RESET_TO_FLASH_DELAY_MS |
| 116 | +#define PICO_STDIO_USB_RESET_RESET_TO_FLASH_DELAY_MS 100 |
| 117 | +#endif |
| 118 | + |
| 119 | +// PICO_CONFIG: PICO_STDIO_USB_CONNECTION_WITHOUT_DTR, Disable use of DTR for connection checking meaning connection is assumed to be valid, type=bool, default=0, group=pico_stdio_usb |
| 120 | +#ifndef PICO_STDIO_USB_CONNECTION_WITHOUT_DTR |
| 121 | +#define PICO_STDIO_USB_CONNECTION_WITHOUT_DTR 0 |
| 122 | +#endif |
| 123 | + |
| 124 | +// PICO_CONFIG: PICO_STDIO_USB_DEVICE_SELF_POWERED, Set USB device as self powered device, type=bool, default=0, group=pico_stdio_usb |
| 125 | +#ifndef PICO_STDIO_USB_DEVICE_SELF_POWERED |
| 126 | +#define PICO_STDIO_USB_DEVICE_SELF_POWERED 0 |
| 127 | +#endif |
| 128 | + |
| 129 | +// PICO_CONFIG: PICO_STDIO_USB_SUPPORT_CHARS_AVAILABLE_CALLBACK, Enable USB STDIO support for stdio_set_chars_available_callback. Can be disabled to make use of USB CDC RX callback elsewhere, type=bool, default=1, group=pico_stdio_usb |
| 130 | +#ifndef PICO_STDIO_USB_SUPPORT_CHARS_AVAILABLE_CALLBACK |
| 131 | +#define PICO_STDIO_USB_SUPPORT_CHARS_AVAILABLE_CALLBACK 1 |
| 132 | +#endif |
| 133 | + |
| 134 | +#ifdef __cplusplus |
| 135 | +extern "C" { |
| 136 | +#endif |
| 137 | + |
| 138 | +extern stdio_driver_t stdio_usb; |
| 139 | + |
| 140 | +/*! \brief Explicitly initialize USB stdio and add it to the current set of stdin drivers |
| 141 | + * \ingroup pico_stdio_usb |
| 142 | + * |
| 143 | + * \ref PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS can be set to cause this method to wait for a CDC connection |
| 144 | + * from the host before returning, which is useful if you don't want any initial stdout output to be discarded |
| 145 | + * before the connection is established. |
| 146 | + * |
| 147 | + * \return true if the USB CDC was initialized, false if an error occurred |
| 148 | + */ |
| 149 | +bool stdio_usb_init(void); |
| 150 | + |
| 151 | +/*! \brief Explicitly deinitialize USB stdio and remove it from the current set of stdin drivers |
| 152 | + * \ingroup pico_stdio_usb |
| 153 | + * |
| 154 | + * \return true if the USB CDC was deinitialized, false if an error occurred |
| 155 | + */ |
| 156 | +bool stdio_usb_deinit(void); |
| 157 | + |
| 158 | +/*! \brief Check if there is an active stdio CDC connection to a host |
| 159 | + * \ingroup pico_stdio_usb |
| 160 | + * |
| 161 | + * \return true if stdio is connected over CDC |
| 162 | + */ |
| 163 | +bool stdio_usb_connected(void); |
| 164 | +#ifdef __cplusplus |
| 165 | +} |
| 166 | +#endif |
| 167 | + |
| 168 | +#endif |
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