397 lines
14 KiB
C
Executable File
397 lines
14 KiB
C
Executable File
/**
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* description: Modified LUFA example to get two virtual serial USB devices.
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* author: Kai Lauterbach
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* date: 08/2016
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* version: v0.1
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* license: GPLv3
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*/
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2015.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2015 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the USB2SerialMux. This file contains the main tasks of the application and
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* is responsible for the initial hardware configuration.
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*/
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#include "main.h"
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/**************************************************************************************/
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uint32_t EEMEM eep_baudrate;
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uint32_t baudrate = 115200; // replacement for the UART_BAUDRATE definition
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/**************************************************************************************/
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/** Contains the current baud rate and other settings of the first virtual serial port. While this demo does not use
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* the physical USART and thus does not use these settings, they must still be retained and returned to the host
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* upon request or the host will assume the device is non-functional.
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*
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* These values are set by the host via a class-specific request, however they are not required to be used accurately.
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* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
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* serial link characteristics and instead sends and receives data in endpoint streams.
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*/
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static CDC_LineEncoding_t LineEncoding1 = { .BaudRateBPS = 0,
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.CharFormat = CDC_LINEENCODING_OneStopBit,
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.ParityType = CDC_PARITY_None,
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.DataBits = 8 };
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/** Contains the current baud rate and other settings of the second virtual serial port. While this demo does not use
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* the physical USART and thus does not use these settings, they must still be retained and returned to the host
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* upon request or the host will assume the device is non-functional.
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*
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* These values are set by the host via a class-specific request, however they are not required to be used accurately.
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* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
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* serial link characteristics and instead sends and receives data in endpoint streams.
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*/
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static CDC_LineEncoding_t LineEncoding2 = { .BaudRateBPS = 0,
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.CharFormat = CDC_LINEENCODING_OneStopBit,
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.ParityType = CDC_PARITY_None,
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.DataBits = 8 };
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/**************************************************************************************/
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/** Main program entry point. This routine configures the hardware required by the application, then
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* enters a loop to run the application tasks in sequence.
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*/
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int main(void)
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{
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SetupHardware();
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// initialize the command interpreter
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cc_init();
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SET_ERR_MASK(ERRMASK_USB_NOTREADY);
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GlobalInterruptEnable();
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for (;;)
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{
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CDC1_Task();
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CDC2_Task();
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USB_USBTask();
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//uart_putc('1');
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}
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}
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/**************************************************************************************/
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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#if (ARCH == ARCH_AVR8)
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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#elif (ARCH == ARCH_XMEGA)
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/* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
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XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
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XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);
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/* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
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XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
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XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
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PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
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#endif
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// set the three MUX control lines to output
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DDRB |= (1 << PIN4) | (1 << PIN5) | (1 << PIN6);
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// set every pin to low
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EN_MUX_LINE0;
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DDRB |= (1 << PIN0) | (1 << PIN1);
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LED0_OFF;
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LED1_OFF;
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/* UART Hardware Initialization */
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eeprom_busy_wait();
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baudrate = eeprom_read_dword(&eep_baudrate);
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if (baudrate == 0xffffffff)
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{
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eeprom_busy_wait();
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baudrate = 115200;
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eeprom_write_dword(&eep_baudrate, baudrate);
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}
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// initialize the uart to the default baudrate
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uart_init( UART_BAUD_SELECT(baudrate, F_CPU) );
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sei();
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/* USB Hardware Initialization */
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USB_Init();
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}
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/**************************************************************************************/
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/** Function to manage CDC data transmission and reception to and from the host for the first CDC interface,
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* which sends answers or response data to the host.
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*/
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void CDC1_Task(void)
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{
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/* Device must be connected and configured for the task to run */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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/* Select the Serial Rx Endpoint */
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Endpoint_SelectEndpoint(CDC1_RX_EPADDR);
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if (Endpoint_IsOUTReceived())
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{
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/* Create a temp buffer big enough to hold the incoming endpoint packet */
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uint8_t Buffer[Endpoint_BytesInEndpoint()];
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/* Remember how large the incoming packet is */
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uint16_t DataLength = Endpoint_BytesInEndpoint();
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/* Read in the incoming packet into the buffer */
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Endpoint_Read_Stream_LE(&Buffer, DataLength, NULL);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearOUT();
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for (uint16_t i = 0; i < DataLength; i++)
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{
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// process the received data and descide to do an action
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LED0_ON;
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cc_processData(Buffer[i]);
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LED0_OFF;
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}
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}
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}
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/**************************************************************************************/
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void USB_serialStreamWriteC(char *data, uint16_t len)
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{
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/* Determine if data/answeres should be sent to the host
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* the previous RX section should be clarify that behaviour.
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*/
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/* Flag management - Only allow one string to be sent per action */
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if (data != NULL && len > 0 && LineEncoding1.BaudRateBPS)
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{
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LED1_ON;
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/* Select the Serial Tx Endpoint */
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Endpoint_SelectEndpoint(CDC1_TX_EPADDR);
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/* Write the String to the Endpoint */
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Endpoint_Write_Stream_LE(data, len, NULL);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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/* Wait until the endpoint is ready for another packet */
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Endpoint_WaitUntilReady();
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/* Send an empty packet to ensure that the host does not buffer data sent to it */
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Endpoint_ClearIN();
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LED1_OFF;
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}
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}
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/**************************************************************************************/
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/** Function to manage CDC data transmission and reception to and from the host for the second CDC interface,
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* which sends all data received from a node (mux) during USART to the host.
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*/
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void CDC2_Task(void)
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{
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/* Device must be connected and configured for the task to run */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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//=====================================
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/* Select the Serial Rx Endpoint */
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Endpoint_SelectEndpoint(CDC2_RX_EPADDR);
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/* Check to see if any data has been received */
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if (Endpoint_IsOUTReceived())
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{
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/* Create a temp buffer big enough to hold the incoming endpoint packet */
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uint8_t Buffer[Endpoint_BytesInEndpoint()];
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/* Remember how large the incoming packet is */
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uint16_t DataLength = Endpoint_BytesInEndpoint();
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/* Read in the incoming packet into the buffer */
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Endpoint_Read_Stream_LE(&Buffer, DataLength, NULL);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearOUT();
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// at this point send the data to the USART
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// Send USART &Buffer
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for (uint16_t i = 0; i < DataLength; i++)
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{
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uart_putc(Buffer[i]);
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}
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}
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//=====================================
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uint8_t outBuffer[OUTPUT_BUFFER_SIZE];
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// read the USART data and send them to the host
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// Fill &Buffer with USART data or send the USART input buffer direct
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uint16_t cnt = 0;
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int c = uart_getc();
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while (!(c & UART_NO_DATA) && cnt < OUTPUT_BUFFER_SIZE)
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{
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//LED0_ON;
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outBuffer[cnt] = c;
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c = uart_getc();
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cnt++;
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}
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// send the data which was received from the uart connection
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if (cnt > 0)
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{
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/* Select the Serial Tx Endpoint */
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Endpoint_SelectEndpoint(CDC2_TX_EPADDR);
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/* Write the received data to the endpoint */
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Endpoint_Write_Stream_LE(&outBuffer, cnt, NULL);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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/* Wait until the endpoint is ready for the next packet */
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Endpoint_WaitUntilReady();
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/* Send an empty packet to prevent host buffering */
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Endpoint_ClearIN();
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}
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}
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/**************************************************************************************/
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
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* starts the library USB task to begin the enumeration and USB management process.
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*/
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void EVENT_USB_Device_Connect(void)
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{
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/* Indicate USB enumerating */
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SET_ERR_MASK(ERRMASK_USB_ENUMERATING);
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs and stops the USB management and CDC management tasks.
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*/
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void EVENT_USB_Device_Disconnect(void)
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{
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/* Indicate USB not ready */
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SET_ERR_MASK(ERRMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured and the CDC management tasks are started.
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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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/* Setup first CDC Interface's Endpoints */
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);
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/* Setup second CDC Interface's Endpoints */
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
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ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);
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/* Reset line encoding baud rates so that the host knows to send new values */
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LineEncoding1.BaudRateBPS = 0;
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LineEncoding2.BaudRateBPS = 0;
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/* Indicate endpoint configuration success or failure */
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SET_ERR_MASK(ConfigSuccess ? ERRMASK_USB_READY : ERRMASK_USB_ERROR);
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}
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/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
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* the device from the USB host before passing along unhandled control requests to the library for processing
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* internally.
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*/
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void EVENT_USB_Device_ControlRequest(void)
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{
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/* Determine which interface's Line Coding data is being set from the wIndex parameter */
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void* LineEncodingData = (USB_ControlRequest.wIndex == 0) ? &LineEncoding1 : &LineEncoding2;
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/* Process CDC specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case CDC_REQ_GetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Write the line coding data to the control endpoint */
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Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
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Endpoint_ClearOUT();
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}
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break;
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case CDC_REQ_SetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Read the line coding data in from the host into the global struct */
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Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
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Endpoint_ClearIN();
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}
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break;
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case CDC_REQ_SetControlLineState:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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Endpoint_ClearStatusStage();
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}
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break;
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}
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}
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/**************************************************************************************/
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