2.26.1. usb_device_class_cdc
— CDC ACM (serial port over USB)¶
USB CDC (Communications Device Class) ACM (Abstract Control Model) is a vendor-independent publicly documented protocol that can be used for emulating serial ports over USB.
More information on Wikipedia.
Source code: src/drivers/usb/device/class/cdc.h, src/drivers/usb/device/class/cdc.c
Test code: tst/drivers/usb_device/main.c
Defines
-
usb_device_class_cdc_read
(self_p, buf_p, size)¶ Read data from the CDC driver.
- Return
- Number of bytes read or negative error code.
- Parameters
self_p
-Initialized driver object.
buf_p
-Buffer to read into.
size
-Number of bytes to read.
-
usb_device_class_cdc_write
(self_p, buf_p, size)¶ Write data to the CDC driver.
- Return
- Number of bytes written or negative error code.
- Parameters
self_p
-Initialized driver object.
buf_p
-Buffer to write.
size
-Number of bytes to write.
Functions
-
int
usb_device_class_cdc_module_init
(void)¶ Initialize the CDC module.
- Return
- zero(0) or negative error code.
-
int
usb_device_class_cdc_init
(struct usb_device_class_cdc_driver_t *self_p, int control_interface, int endpoint_in, int endpoint_out, void *rxbuf_p, size_t size)¶ Initialize driver object from given configuration.
- Return
- zero(0) or negative error code.
- Parameters
self_p
-Driver object to be initialized.
rxbuf_p
-Reception buffer.
size
-Reception buffer size.
-
int
usb_device_class_cdc_input_isr
(struct usb_device_class_cdc_driver_t *self_p)¶ Called by the USB device driver periodically to let the CDC driver read received data from the hardware.
- Return
- zero(0) or negative error code.
- Parameters
self_p
-Initialized driver object.
-
int
usb_device_class_cdc_is_connected
(struct usb_device_class_cdc_driver_t *self_p)¶ Check if the CDC is connected to the remote endpoint.
- Return
- true(1) if connected, false(0) if disconnected, otherwise negative error code.
- Parameters
self_p
-Initialized driver object.
-
struct
usb_device_class_cdc_driver_t
¶