USB OTG definitions for the AVR8 microcontrollers.
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Architecture specific USB OTG definitions for the Atmel 8-bit AVR microcontrollers.
#define USB_OTG_SRP_VBUS (1 << SRPSEL) |
#define USB_OTG_STP_DATA 0 |
static void USB_OTG_Device_CancelHNPRequest |
( |
void |
| ) |
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inlinestatic |
Cancel a Host Negotiation Protocol request. This stops a pending HNP request to the other connected device.
static void USB_OTG_Device_InitiateSRP |
( |
const uint8_t |
SRPTypeMask | ) |
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inlinestatic |
Initiates a Session Request Protocol request. Most OTG devices turn off VBUS when the USB interface is not in use, to conserve power. Sending a SRP to a USB OTG device running in host mode indicates that VBUS should be applied and a session started.
There are two different methods of sending a SRP - either pulses on the VBUS line, or by pulsing the Data + line via the internal pull-up resistor.
- Parameters
-
static bool USB_OTG_Device_IsSendingHNP |
( |
void |
| ) |
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inlinestatic |
Determines if the device is currently sending a HNP to an attached host.
- Returns
- Boolean
true
if currently sending a HNP to the other connected device, false
otherwise
static void USB_OTG_Device_RequestHNP |
( |
void |
| ) |
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inlinestatic |
Initiate a Host Negotiation Protocol request. This indicates to the other connected device that the device wishes to change device/host roles.
static void USB_OTG_Host_AcceptHNP |
( |
void |
| ) |
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inlinestatic |
Accepts a HNP from a connected device, indicating that both devices should exchange device/host roles.
static bool USB_OTG_Host_IsHNPReceived |
( |
void |
| ) |
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inlinestatic |
Indicates if the connected device is currently sending a HNP request.
- Returns
- Boolean
true
if a HNP is currently being issued by the connected device, false
otherwise.
static void USB_OTG_Host_RejectHNP |
( |
void |
| ) |
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inlinestatic |
Rejects a HNP from a connected device, indicating that both devices should remain in their current device/host roles.