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tinyusb: Add VBUS voltage monitoring feature

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VBUS voltage monitoring is mandated by USB specification for self-powered devices.
This implementation maps selected GPIO to bvalid signal of USB-OTG peripheral.

Closes https://github.com/espressif/esp-idf/issues/7747
This commit is contained in:
Tomas Rezucha
2022-09-22 12:33:33 +02:00
parent dc705312a3
commit 1410f5a798
5 changed files with 40 additions and 11 deletions
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9
components/tinyusb/additions/include/tinyusb.h
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@@ -19,7 +19,12 @@ extern "C" {
#endif
/**
* @brief Configuration structure of the tinyUSB core
* @brief Configuration structure of the TinyUSB core
*
* USB specification mandates self-powered devices to monitor USB VBUS to detect connection/disconnection events.
* If you want to use this feature, connected VBUS to any free GPIO through a voltage divider or voltage comparator.
* The voltage divider output should be (0.75 * Vdd) if VBUS is 4.4V (lowest valid voltage at device port).
* The comparator thresholds should be set with hysteresis: 4.35V (falling edge) and 4.75V (raising edge).
*/
typedef struct {
union {
@@ -29,6 +34,8 @@ typedef struct {
const char **string_descriptor; /*!< Pointer to an array of string descriptors */
bool external_phy; /*!< Should USB use an external PHY */
const uint8_t *configuration_descriptor; /*!< Pointer to a configuration descriptor. If set to NULL, TinyUSB device will use a default configuration descriptor whose values are set in Kconfig */
bool self_powered; /*!< This is a self-powered USB device. USB VBUS must be monitored. */
int vbus_monitor_io; /*!< GPIO for VBUS monitoring. Ignored if not self_powered. */
} tinyusb_config_t;
/**