90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* usbcdc.c
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*
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* Created on: Nov 22, 2020
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* Author: Doug
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*
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* Copyright (C) 2011-2023 Doug Brown
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "../usbcdc.h"
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#include "LUFA/Drivers/USB/USB.h"
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#include "cdc_device_definition.h"
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#include "hardware.h"
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/** Initializes the USB CDC device
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*
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*/
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void USBCDC_Init(void)
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{
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// Initialize LUFA.
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// We have to manually start the USB PLL rather than allow LUFA to do it,
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// because we might be on an AT90USB128x instead of AT90USB64x, and LUFA's
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// automatic PLL control decides on the PLL init value at compile time.
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// It differs between the two chips when there's a 16 MHz crystal.
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if (IsAT90USB128x())
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{
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PLLCSR = (1 << PLLP2) | (1 << PLLP0);
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PLLCSR = ((1 << PLLP2) | (1 << PLLP0) | (1 << PLLE));
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}
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else
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{
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PLLCSR = (1 << PLLP2) | (1 << PLLP1);
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PLLCSR = ((1 << PLLP2) | (1 << PLLP1) | (1 << PLLE));
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}
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while (!USB_PLL_IsReady());
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USB_Init();
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}
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/** Disables the USB CDC device
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*
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*/
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void USBCDC_Disable(void)
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{
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// Disable LUFA, this will cause us to no longer identify as a USB device
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USB_Disable();
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USB_PLL_Off();
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}
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/** Main loop handler for the USB CDC device. Call from the main loop.
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*
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*/
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void USBCDC_Check(void)
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{
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// Do the periodic CDC and USB tasks in LUFA
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CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
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USB_USBTask();
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}
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/** LUFA event handler for when the USB configuration changes.
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*
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*/
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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bool ConfigSuccess = true;
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ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
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}
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/** LUFA event handler for when a USB control request is received
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*
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*/
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void EVENT_USB_Device_ControlRequest(void)
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{
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CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
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}
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