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klaute 2016-08-30 19:00:12 +02:00
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firmware/main.c
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@ -1,21 +1,13 @@
/**
* description: Modified LUFA example to get two virtual serial USB devices.
* author: Kai Lauterbach
* date: 08/2016
* version: v0.1
* license: GPLv3
*/
/*
LUFA Library
Copyright (C) Dean Camera, 2016.
Copyright (C) Dean Camera, 2015.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2016 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Copyright 2015 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
@ -38,467 +30,357 @@
/** \file
*
* Main source file for the project - based on the Mouse and VirtualSerial lufa demo.
* This file contains the main tasks of the demo and is responsible for the initial
* application hardware configuration.
* Main source file for the iUSB2SerialMux demo. This file contains the main tasks of the demo and
* is responsible for the initial application hardware configuration.
*/
#include "main.h"
//********************************************************************************//
/**************************************************************************************/
FIFO_t agent_fifo;
FIFO_t seq_mod_fifo;
FIFO_t seq_val_fifo;
uint32_t EEMEM eep_baudrate;
uint8_t seq_delay = 0;
uint32_t baudrate = 115200; // replacement for the UART_BAUDRATE definition
volatile uint16_t time_measure_cnt = 0;
volatile uint16_t keystroke_delay_time_measure_cnt_old = 0;
volatile uint16_t seq_delay_time_measure_cnt_old = 0;
/**************************************************************************************/
//********************************************************************************//
/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */
static uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)];
//********************************************************************************//
/** LUFA HID Class driver interface configuration and state information. This structure is
* passed to all HID Class driver functions, so that multiple instances of the same class
* within a device can be differentiated from one another. This is for the keyboard HID
* interface within the device.
/** Contains the current baud rate and other settings of the first virtual serial port. While this demo does not use
* the physical USART and thus does not use these settings, they must still be retained and returned to the host
* upon request or the host will assume the device is non-functional.
*
* These values are set by the host via a class-specific request, however they are not required to be used accurately.
* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
* serial link characteristics and instead sends and receives data in endpoint streams.
*/
USB_ClassInfo_HID_Device_t Keyboard_HID_Interface =
{
.Config =
{
.InterfaceNumber = INTERFACE_ID_Keyboard,
.ReportINEndpoint =
{
.Address = KEYBOARD_IN_EPADDR,
.Size = KEYBOARD_EPSIZE,
.Banks = 1,
},
.PrevReportINBuffer = PrevKeyboardHIDReportBuffer,
.PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer),
},
};
static CDC_LineEncoding_t LineEncoding1 = { .BaudRateBPS = 0,
.CharFormat = CDC_LINEENCODING_OneStopBit,
.ParityType = CDC_PARITY_None,
.DataBits = 8 };
/** LUFA CDC Class driver interface configuration and state information. This structure is
* passed to all CDC Class driver functions, so that multiple instances of the same class
* within a device can be differentiated from one another.
/** Contains the current baud rate and other settings of the second virtual serial port. While this demo does not use
* the physical USART and thus does not use these settings, they must still be retained and returned to the host
* upon request or the host will assume the device is non-functional.
*
* These values are set by the host via a class-specific request, however they are not required to be used accurately.
* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
* serial link characteristics and instead sends and receives data in endpoint streams.
*/
USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
{
.Config =
{
.ControlInterfaceNumber = INTERFACE_ID_CDC_CCI,
.DataINEndpoint =
{
.Address = CDC_TX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.DataOUTEndpoint =
{
.Address = CDC_RX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.NotificationEndpoint =
{
.Address = CDC_NOTIFICATION_EPADDR,
.Size = CDC_NOTIFICATION_EPSIZE,
.Banks = 1,
},
},
};
static CDC_LineEncoding_t LineEncoding2 = { .BaudRateBPS = 0,
.CharFormat = CDC_LINEENCODING_OneStopBit,
.ParityType = CDC_PARITY_None,
.DataBits = 8 };
/** Standard file stream for the CDC interface when set up, so that the virtual
* CDC COM port can be used like any regular character stream in the C APIs.
*/
static FILE USBSerialStream;
//********************************************************************************//
/** Main program entry point. This routine contains the overall program flow, including initial
* setup of all components and the main program loop.
/** Main program entry point. This routine configures the hardware required by the application, then
* enters a loop to run the application tasks in sequence.
*/
int main(void)
{
// USB/LUFA init
SetupHardware();
// init the timer for time measurements
timer_init();
// LED matrix init
lm_init();
// KEY matrix init
km_init();
// read the key configuration table from EEPROM
ch_readConfig();
// init the serial communication command controller
// initialize the command interpreter
cc_init();
FIFO_init( agent_fifo);
FIFO_init(seq_mod_fifo);
FIFO_init(seq_val_fifo);
SET_ERR_MASK(ERRMASK_USB_NOTREADY);
// Create a regular character stream for the interface so that it can be used with the stdio.h functions
CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
SET_GLOB_USB_STATUS(STATUSMASK_USB_NOTREADY);
GlobalInterruptEnable();
for (;;)
{
SendVirtualSerialData();
ProcessVirtualSerialData();
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
HID_Device_USBTask(&Keyboard_HID_Interface);
CDC1_Task();
CDC2_Task();
USB_USBTask();
static uint8_t delay = 0;
if (delay > 50)
{
delay = 0;
lm_show();
}
delay++;
//uart_putc('1');
}
}
//********************************************************************************//
void timer_init()
{
// configure TIMER0 to count using a specified frequency the TCNT0 variable to generate
// a overflow interrupt
TCCR0A = 0x02; // WGM1 = 1; WGM0 = 0 => CTC-mode
TCCR0B = 0x03; // prescaler = 64; WGM2 = 0 => 16MHz * 256 / 64 = ~ 1mz per Overflow Interrupt
TIMSK0 = 0x01; // Overflow Interrupt Enable
sei();
}
ISR(TCC0_OVF_vect)
{
if (time_measure_cnt >= 65534)
{
// reset all the counter values to prevent unpredictable behaviour
time_measure_cnt = 0;
seq_delay_time_measure_cnt_old = 0;
keystroke_delay_time_measure_cnt_old = 0;
}
time_measure_cnt++;
}
//********************************************************************************//
/** Configures the board hardware and chip peripherals for the demo's functionality.
*/
void SetupHardware()
/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
{
#if (ARCH == ARCH_AVR8)
// Disable watchdog if enabled by bootloader/fuses
/* Disable watchdog if enabled by bootloader/fuses */
MCUSR &= ~(1 << WDRF);
wdt_disable();
// Disable clock division */
/* Disable clock division */
clock_prescale_set(clock_div_1);
#elif (ARCH == ARCH_XMEGA)
// Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU
// core to run from it
/* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);
// Start the 32MHz internal RC oscillator and start the DFLL to increase it to
// 48MHz using the USB SOF as a reference
/* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
#endif
// Hardware Initialization */
// set the three MUX control lines to output
DDRB |= (1 << PIN4) | (1 << PIN5) | (1 << PIN6);
// set every pin to low
EN_MUX_LINE0;
DDRB |= (1 << PIN0) | (1 << PIN1);
LED0_OFF;
LED1_OFF;
/* UART Hardware Initialization */
eeprom_busy_wait();
baudrate = eeprom_read_dword(&eep_baudrate);
if (baudrate == 0xffffffff)
{
eeprom_busy_wait();
baudrate = 115200;
eeprom_write_dword(&eep_baudrate, baudrate);
}
uart_init( UART_BAUD_SELECT(baudrate, F_CPU) );
sei();
/* USB Hardware Initialization */
USB_Init();
}
//********************************************************************************//
void ProcessVirtualSerialData()
{
// process the read data from Host here, if there is data to read
int16_t ReceivedBytes = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
if (ReceivedBytes > 0)
{
for (uint16_t i = 0; i < ReceivedBytes; i++)
{
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
// call the command controller - command processor
cc_processData((uint8_t)ReceivedByte);
}
}
}
//********************************************************************************//
void SendVirtualSerialData()
{
char* ReportString = NULL;
// send the next id from the agent FIFO
if (FIFO_available(agent_fifo))
{
uint8_t id = FIFO_pop(agent_fifo);
ReportString = " ";
sprintf(ReportString, "%c%c%c%c%c%c", MSG_SOM1, MSG_SOM2,
MSG_TYPE_AGENTID, id,
MSG_EOM1, MSG_EOM2);
}
if ((ReportString != NULL))
{
// Write the string to the virtual COM port via the created character stream
USB_serialStreamWriteC(ReportString, 6);
}
}
//********************************************************************************//
/** HID class driver callback function for the creation of HID reports to the host.
*
* \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced
* \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID
* \param[in] ReportType Type of the report to create, either HID_REPORT_ITEM_In or HID_REPORT_ITEM_Feature
* \param[out] ReportData Pointer to a buffer where the created report should be stored
* \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent)
*
* \return Boolean \c true to force the sending of the report, \c false to let the library determine if it needs to be sent
/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
* starts the library USB task to begin the enumeration and USB management process.
*/
bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo,
uint8_t* const ReportID,
const uint8_t ReportType,
void* ReportData,
uint16_t* const ReportSize)
{
// Determine which interface must have its report generated */
if (HIDInterfaceInfo == &Keyboard_HID_Interface)
{
USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;
// update the key matrix values
km_updateKeyStates();
// prepare the new sequence related to the pressed key
for (uint8_t k = 0; k < LM_LED_CNT; k++)
{
if (km_getKeyState(k) == KEY_STATE_GO_DOWN)
{
FIFO_push(agent_fifo, k);
for (uint8_t s = 0; s < EEP_KEY_CNT; s++)
{
// ignore a mod/value combination of 0xff 0xff
// just add the sequence to a "sequence execution FIFO" in case that it
// is not an agent call
// prevent multiple calls
// TODO manage multikey (simultanous pressed) shortcuts here
if (key_config[k][s][0] == 0xff && key_config[k][s][1] == 0xff)
{
s = EEP_KEY_CNT; // abort the loop, no more data found
} else {
FIFO_push(seq_mod_fifo, key_config[k][s][0]);
FIFO_push(seq_val_fifo, key_config[k][s][1]);
}
}
}
}
// TODO maybe we shall do ab bit more precise time measurement
if (seq_delay > 0 && time_measure_cnt > seq_delay_time_measure_cnt_old)
{
seq_delay--;
seq_delay_time_measure_cnt_old = time_measure_cnt;
}
if (keystroke_delay_cnt > 0 && time_measure_cnt > keystroke_delay_time_measure_cnt_old)
{
// TODO test if NN seconds are gone
keystroke_delay_cnt--;
keystroke_delay_time_measure_cnt_old = time_measure_cnt;
}
// execute the sequence execution FIFO content
if (FIFO_available(seq_mod_fifo) && FIFO_available(seq_val_fifo) &&
seq_delay == 0 && keystroke_delay_cnt == 0)
{
uint8_t mod = FIFO_pop(seq_mod_fifo);
uint8_t val = FIFO_pop(seq_val_fifo);
// reset the keystroke delay
keystroke_delay_cnt = keystroke_delay;
// process the data
if ((mod & KEY_MOD_DELAY) != 0)
{
// start the delay
seq_delay = val;
} else {
// TODO be aware of the os_type variable
if ((mod & KEY_MOD_FN) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_RIGHTSHIFT; // TODO fix the modifier
if ((mod & KEY_MOD_SHIFT) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_LEFTSHIFT;
if ((mod & KEY_MOD_CTRL) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_LEFTCTRL;
if ((mod & KEY_MOD_ALT) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_LEFTALT;
if ((mod & KEY_MOD_ALTGR) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_RIGHTALT;
if ((mod & KEY_MOD_SUPER) != 0)
KeyboardReport->Modifier += HID_KEYBOARD_MODIFIER_LEFTGUI;
// possible values: http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/group___group___u_s_b_class_h_i_d_common.html
KeyboardReport->KeyCode[0] = val; // TODO one key at a time, up to 6 is supported: http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/struct_u_s_b___keyboard_report___data__t.html#a1c24d97011685d58ab05e2f65d7b2c1b
}
}
// Some debug and test code
for (uint8_t i = 0; i < LM_LED_CNT; i++)
{
if (km_getKeyState(i) == KEY_STATE_GO_DOWN)
lm_ledOn(i);
if (km_getKeyState(i) == KEY_STATE_GO_UP)
lm_ledOff(i);
}
*ReportSize = sizeof(USB_KeyboardReport_Data_t);
}
return false;
}
//********************************************************************************//
/** HID class driver callback function for the processing of HID reports from the host.
*
* \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced
* \param[in] ReportID Report ID of the received report from the host
* \param[in] ReportType The type of report that the host has sent, either HID_REPORT_ITEM_Out or HID_REPORT_ITEM_Feature
* \param[in] ReportData Pointer to a buffer where the received report has been stored
* \param[in] ReportSize Size in bytes of the received HID report
*/
void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo,
const uint8_t ReportID,
const uint8_t ReportType,
const void* ReportData,
const uint16_t ReportSize)
{
if (HIDInterfaceInfo == &Keyboard_HID_Interface)
{
uint8_t* LEDReport = (uint8_t*)ReportData;
/*
// TODO process the Keyboard LED status information
if (*LEDReport & HID_KEYBOARD_LED_NUMLOCK)
if (*LEDReport & HID_KEYBOARD_LED_CAPSLOCK)
if (*LEDReport & HID_KEYBOARD_LED_SCROLLLOCK)
*/
}
}
//********************************************************************************//
/** CDC class driver callback function the processing of changes to the virtual
* control lines sent from the host..
*
* \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced
*/
void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t *const CDCInterfaceInfo)
{
// You can get changes to the virtual CDC lines in this callback; a common
// use-case is to use the Data Terminal Ready (DTR) flag to enable and
// disable CDC communications in your application when set to avoid the
// application blocking while waiting for a host to become ready and read
// in the pending data from the USB endpoints.
bool HostReady = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR) != 0;
}
//********************************************************************************//
/** Event handler for the library USB Connection event. */
void EVENT_USB_Device_Connect(void)
{
SET_GLOB_USB_STATUS(STATUSMASK_USB_ENUMERATING);
/* Indicate USB enumerating */
SET_ERR_MASK(ERRMASK_USB_ENUMERATING);
}
/** Event handler for the library USB Disconnection event. */
/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
* the status LEDs and stops the USB management and CDC management tasks.
*/
void EVENT_USB_Device_Disconnect(void)
{
SET_GLOB_USB_STATUS(STATUSMASK_USB_NOTREADY);
/* Indicate USB not ready */
SET_ERR_MASK(ERRMASK_USB_NOTREADY);
}
/** Event handler for the library USB Configuration Changed event. */
/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
* of the USB device after enumeration - the device endpoints are configured and the CDC management tasks are started.
*/
void EVENT_USB_Device_ConfigurationChanged(void)
{
bool ConfigSuccess = true;
ConfigSuccess &= HID_Device_ConfigureEndpoints(&Keyboard_HID_Interface);
ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
/* Setup first CDC Interface's Endpoints */
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC1_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);
USB_Device_EnableSOFEvents();
/* Setup second CDC Interface's Endpoints */
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC2_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);
SET_GLOB_USB_STATUS(ConfigSuccess ? STATUSMASK_USB_READY : STATUSMASK_USB_ERROR);
/* Reset line encoding baud rates so that the host knows to send new values */
LineEncoding1.BaudRateBPS = 0;
LineEncoding2.BaudRateBPS = 0;
/* Indicate endpoint configuration success or failure */
SET_ERR_MASK(ConfigSuccess ? ERRMASK_USB_READY : ERRMASK_USB_ERROR);
}
/** Event handler for the library USB Control Request reception event. */
/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
* the device from the USB host before passing along unhandled control requests to the library for processing
* internally.
*/
void EVENT_USB_Device_ControlRequest(void)
{
HID_Device_ProcessControlRequest(&Keyboard_HID_Interface);
CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
}
/* Determine which interface's Line Coding data is being set from the wIndex parameter */
void* LineEncodingData = (USB_ControlRequest.wIndex == 0) ? &LineEncoding1 : &LineEncoding2;
/** Event handler for the USB device Start Of Frame event. */
void EVENT_USB_Device_StartOfFrame(void)
{
HID_Device_MillisecondElapsed(&Keyboard_HID_Interface);
}
//********************************************************************************//
void USB_serialStreamWriteC(char* msg, uint16_t len)
{
for (uint8_t i = 0; i < len; i++)
/* Process CDC specific control requests */
switch (USB_ControlRequest.bRequest)
{
fputc(msg[i], &USBSerialStream);
case CDC_REQ_GetLineEncoding:
if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
{
Endpoint_ClearSETUP();
/* Write the line coding data to the control endpoint */
Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
Endpoint_ClearOUT();
}
break;
case CDC_REQ_SetLineEncoding:
if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
{
Endpoint_ClearSETUP();
/* Read the line coding data in from the host into the global struct */
Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_LineEncoding_t));
Endpoint_ClearIN();
}
break;
case CDC_REQ_SetControlLineState:
if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
{
Endpoint_ClearSETUP();
Endpoint_ClearStatusStage();
}
break;
}
}
void USB_serialStreamWrite(char* msg)
/** Function to manage CDC data transmission and reception to and from the host for the first CDC interface,
* which sends answers or response data to the host.
*/
void CDC1_Task(void)
{
fputs(msg, &USBSerialStream);
/* Device must be connected and configured for the task to run */
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
//===========================================================================
/* Select the Serial Rx Endpoint */
Endpoint_SelectEndpoint(CDC1_RX_EPADDR);
if (Endpoint_IsOUTReceived())
{
/* Create a temp buffer big enough to hold the incoming endpoint packet */
uint8_t Buffer[Endpoint_BytesInEndpoint()];
/* Remember how large the incoming packet is */
uint16_t DataLength = Endpoint_BytesInEndpoint();
/* Read in the incoming packet into the buffer */
Endpoint_Read_Stream_LE(&Buffer, DataLength, NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearOUT();
for (uint16_t i = 0; i < DataLength; i++)
{
// process the received data and descide to do an action
LED0_ON;
cc_processData(Buffer[i]);
LED0_OFF;
}
}
}
//********************************************************************************//
void USB_serialStreamWriteC(char *data, uint16_t len)
{
//===========================================================================
/* Determine if data/answeres should be sent to the host
* the previous RX section should be clarify that behaviour.
*/
/* Flag management - Only allow one string to be sent per action */
if (data != NULL && len > 0 && LineEncoding1.BaudRateBPS)
{
LED1_ON;
/* Select the Serial Tx Endpoint */
Endpoint_SelectEndpoint(CDC1_TX_EPADDR);
/* Write the String to the Endpoint */
Endpoint_Write_Stream_LE(data, len, NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
/* Wait until the endpoint is ready for another packet */
Endpoint_WaitUntilReady();
/* Send an empty packet to ensure that the host does not buffer data sent to it */
Endpoint_ClearIN();
LED1_OFF;
}
}
/** Function to manage CDC data transmission and reception to and from the host for the second CDC interface,
* which sends all data received from a node (mux) during USART to the host.
*/
void CDC2_Task(void)
{
/* Device must be connected and configured for the task to run */
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
//===========================================================================
/* Select the Serial Rx Endpoint */
Endpoint_SelectEndpoint(CDC2_RX_EPADDR);
/* Check to see if any data has been received */
if (Endpoint_IsOUTReceived())
{
/* Create a temp buffer big enough to hold the incoming endpoint packet */
uint8_t Buffer[Endpoint_BytesInEndpoint()];
/* Remember how large the incoming packet is */
uint16_t DataLength = Endpoint_BytesInEndpoint();
/* Read in the incoming packet into the buffer */
Endpoint_Read_Stream_LE(&Buffer, DataLength, NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearOUT();
// TODO at this point send the data to the USART
// Send USART &Buffer
for (uint16_t i = 0; i < DataLength; i++)
{
uart_putc(Buffer[i]);
}
}
//return;
//===========================================================================
uint8_t outBuffer[OUTPUT_BUFFER_SIZE];
// TODO read the USART data and send them to the host
// Fill &Buffer with USART data or send the USART input buffer direct
uint16_t cnt = 0;
int c = uart_getc();
while (!(c & UART_NO_DATA) && cnt < OUTPUT_BUFFER_SIZE)
{
//LED0_ON;
outBuffer[cnt] = c;
c = uart_getc();
cnt++;
}
/*
cnt = 1;
outBuffer[0] = '2';
*/
// send the data which was received from the uart connection
if (cnt > 0)
{
/* Select the Serial Tx Endpoint */
Endpoint_SelectEndpoint(CDC2_TX_EPADDR);
/* Write the received data to the endpoint */
Endpoint_Write_Stream_LE(&outBuffer, cnt, NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
/* Wait until the endpoint is ready for the next packet */
Endpoint_WaitUntilReady();
/* Send an empty packet to prevent host buffering */
Endpoint_ClearIN();
}
}