diff options
| author | Yuval Adam <yuv.adm@gmail.com> | 2012-10-29 23:04:19 +0200 |
|---|---|---|
| committer | Yuval Adam <yuv.adm@gmail.com> | 2012-10-29 23:04:19 +0200 |
| commit | e018ceebed74b8223482bc9d1ed0b31c938381da (patch) | |
| tree | 3151f2ec3af6fb64967a177c85ba2c2af61fb9f6 /boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c | |
| parent | 48395c0348a1a3fa3330e397d2463f62ff5c45c7 (diff) | |
New example files
Diffstat (limited to 'boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c')
| -rw-r--r-- | boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c | 613 |
1 files changed, 613 insertions, 0 deletions
diff --git a/boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c b/boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c new file mode 100644 index 0000000..af4e3c6 --- /dev/null +++ b/boards/ek-lm4f120xl/usb_dev_bulk/usb_dev_bulk.c @@ -0,0 +1,613 @@ +//*****************************************************************************
+//
+// usb_dev_bulk.c - Main routines for the generic bulk device example.
+//
+// Copyright (c) 2012 Texas Instruments Incorporated. All rights reserved.
+// Software License Agreement
+//
+// Texas Instruments (TI) is supplying this software for use solely and
+// exclusively on TI's microcontroller products. The software is owned by
+// TI and/or its suppliers, and is protected under applicable copyright
+// laws. You may not combine this software with "viral" open-source
+// software in order to form a larger program.
+//
+// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
+// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
+// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
+// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
+// DAMAGES, FOR ANY REASON WHATSOEVER.
+//
+// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
+//
+//*****************************************************************************
+
+#include "inc/hw_ints.h"
+#include "inc/hw_memmap.h"
+#include "inc/hw_types.h"
+#include "driverlib/debug.h"
+#include "driverlib/fpu.h"
+#include "driverlib/gpio.h"
+#include "driverlib/interrupt.h"
+#include "driverlib/pin_map.h"
+#include "driverlib/sysctl.h"
+#include "driverlib/systick.h"
+#include "driverlib/timer.h"
+#include "driverlib/uart.h"
+#include "driverlib/rom.h"
+#include "usblib/usblib.h"
+#include "usblib/usb-ids.h"
+#include "usblib/device/usbdevice.h"
+#include "usblib/device/usbdbulk.h"
+#include "utils/uartstdio.h"
+#include "utils/ustdlib.h"
+#include "usb_bulk_structs.h"
+
+//*****************************************************************************
+//
+//! \addtogroup example_list
+//! <h1>USB Generic Bulk Device (usb_dev_bulk)</h1>
+//!
+//! This example provides a generic USB device offering simple bulk data
+//! transfer to and from the host. The device uses a vendor-specific class ID
+//! and supports a single bulk IN endpoint and a single bulk OUT endpoint.
+//! Data received from the host is assumed to be ASCII text and it is
+//! echoed back with the case of all alphabetic characters swapped.
+//!
+//! A Windows INF file for the device is provided on the installation CD and
+//! in the C:/StellarisWare/windows_drivers directory of StellarisWare
+//! releases. This INF contains information required to install the WinUSB
+//! subsystem on WindowsXP and Vista PCs. WinUSB is a Windows subsystem
+//! allowing user mode applications to access the USB device without the need
+//! for a vendor-specific kernel mode driver.
+//!
+//! A sample Windows command-line application, usb_bulk_example, illustrating
+//! how to connect to and communicate with the bulk device is also provided.
+//! The application binary is installed as part of the ``Windows-side examples
+//! for USB kits'' package (SW-USB-win) on the installation CD or via download
+//! from http://www.ti.com/stellarisware . Project files are included to allow
+//! the examples to be built using Microsoft VisualStudio 2008. Source code
+//! for this application can be found in directory
+//! StellarisWare/tools/usb_bulk_example.
+//
+//*****************************************************************************
+
+
+//*****************************************************************************
+//
+// The system tick rate expressed both as ticks per second and a millisecond
+// period.
+//
+//*****************************************************************************
+#define SYSTICKS_PER_SECOND 100
+#define SYSTICK_PERIOD_MS (1000 / SYSTICKS_PER_SECOND)
+
+//*****************************************************************************
+//
+// The global system tick counter.
+//
+//*****************************************************************************
+volatile unsigned long g_ulSysTickCount = 0;
+
+//*****************************************************************************
+//
+// Variables tracking transmit and receive counts.
+//
+//*****************************************************************************
+volatile unsigned long g_ulTxCount = 0;
+volatile unsigned long g_ulRxCount = 0;
+#ifdef DEBUG
+unsigned long g_ulUARTRxErrors = 0;
+#endif
+
+//*****************************************************************************
+//
+// Debug-related definitions and declarations.
+//
+// Debug output is available via UART0 if DEBUG is defined during build.
+//
+//*****************************************************************************
+#ifdef DEBUG
+//*****************************************************************************
+//
+// Map all debug print calls to UARTprintf in debug builds.
+//
+//*****************************************************************************
+#define DEBUG_PRINT UARTprintf
+
+#else
+
+//*****************************************************************************
+//
+// Compile out all debug print calls in release builds.
+//
+//*****************************************************************************
+#define DEBUG_PRINT while(0) ((int (*)(char *, ...))0)
+#endif
+
+//*****************************************************************************
+//
+// Flags used to pass commands from interrupt context to the main loop.
+//
+//*****************************************************************************
+#define COMMAND_PACKET_RECEIVED 0x00000001
+#define COMMAND_STATUS_UPDATE 0x00000002
+
+volatile unsigned long g_ulFlags = 0;
+char *g_pcStatus;
+
+//*****************************************************************************
+//
+// Global flag indicating that a USB configuration has been set.
+//
+//*****************************************************************************
+static volatile tBoolean g_bUSBConfigured = false;
+
+//*****************************************************************************
+//
+// The error routine that is called if the driver library encounters an error.
+//
+//*****************************************************************************
+#ifdef DEBUG
+void
+__error__(char *pcFilename, unsigned long ulLine)
+{
+ UARTprintf("Error at line %d of %s\n", ulLine, pcFilename);
+ while(1)
+ {
+ }
+}
+#endif
+
+//*****************************************************************************
+//
+// Interrupt handler for the system tick counter.
+//
+//*****************************************************************************
+void
+SysTickIntHandler(void)
+{
+ //
+ // Update our system tick counter.
+ //
+ g_ulSysTickCount++;
+}
+
+//*****************************************************************************
+//
+// Receive new data and echo it back to the host.
+//
+// \param psDevice points to the instance data for the device whose data is to
+// be processed.
+// \param pcData points to the newly received data in the USB receive buffer.
+// \param ulNumBytes is the number of bytes of data available to be processed.
+//
+// This function is called whenever we receive a notification that data is
+// available from the host. We read the data, byte-by-byte and swap the case
+// of any alphabetical characters found then write it back out to be
+// transmitted back to the host.
+//
+// \return Returns the number of bytes of data processed.
+//
+//*****************************************************************************
+static unsigned long
+EchoNewDataToHost(tUSBDBulkDevice *psDevice, unsigned char *pcData,
+ unsigned long ulNumBytes)
+{
+ unsigned long ulLoop, ulSpace, ulCount;
+ unsigned long ulReadIndex;
+ unsigned long ulWriteIndex;
+ tUSBRingBufObject sTxRing;
+
+ //
+ // Get the current buffer information to allow us to write directly to
+ // the transmit buffer (we already have enough information from the
+ // parameters to access the receive buffer directly).
+ //
+ USBBufferInfoGet(&g_sTxBuffer, &sTxRing);
+
+ //
+ // How much space is there in the transmit buffer?
+ //
+ ulSpace = USBBufferSpaceAvailable(&g_sTxBuffer);
+
+ //
+ // How many characters can we process this time round?
+ //
+ ulLoop = (ulSpace < ulNumBytes) ? ulSpace : ulNumBytes;
+ ulCount = ulLoop;
+
+ //
+ // Update our receive counter.
+ //
+ g_ulRxCount += ulNumBytes;
+
+ //
+ // Dump a debug message.
+ //
+ DEBUG_PRINT("Received %d bytes\n", ulNumBytes);
+
+ //
+ // Set up to process the characters by directly accessing the USB buffers.
+ //
+ ulReadIndex = (unsigned long)(pcData - g_pucUSBRxBuffer);
+ ulWriteIndex = sTxRing.ulWriteIndex;
+
+ while(ulLoop)
+ {
+ //
+ // Copy from the receive buffer to the transmit buffer converting
+ // character case on the way.
+ //
+
+ //
+ // Is this a lower case character?
+ //
+ if((g_pucUSBRxBuffer[ulReadIndex] >= 'a') &&
+ (g_pucUSBRxBuffer[ulReadIndex] <= 'z'))
+ {
+ //
+ // Convert to upper case and write to the transmit buffer.
+ //
+ g_pucUSBTxBuffer[ulWriteIndex] =
+ (g_pucUSBRxBuffer[ulReadIndex] - 'a') + 'A';
+ }
+ else
+ {
+ //
+ // Is this an upper case character?
+ //
+ if((g_pucUSBRxBuffer[ulReadIndex] >= 'A') &&
+ (g_pucUSBRxBuffer[ulReadIndex] <= 'Z'))
+ {
+ //
+ // Convert to lower case and write to the transmit buffer.
+ //
+ g_pucUSBTxBuffer[ulWriteIndex] =
+ (g_pucUSBRxBuffer[ulReadIndex] - 'Z') + 'z';
+ }
+ else
+ {
+ //
+ // Copy the received character to the transmit buffer.
+ //
+ g_pucUSBTxBuffer[ulWriteIndex] = g_pucUSBRxBuffer[ulReadIndex];
+ }
+ }
+
+ //
+ // Move to the next character taking care to adjust the pointer for
+ // the buffer wrap if necessary.
+ //
+ ulWriteIndex++;
+ ulWriteIndex = (ulWriteIndex == BULK_BUFFER_SIZE) ? 0 : ulWriteIndex;
+
+ ulReadIndex++;
+ ulReadIndex = (ulReadIndex == BULK_BUFFER_SIZE) ? 0 : ulReadIndex;
+
+ ulLoop--;
+ }
+
+ //
+ // We've processed the data in place so now send the processed data
+ // back to the host.
+ //
+ USBBufferDataWritten(&g_sTxBuffer, ulCount);
+
+ DEBUG_PRINT("Wrote %d bytes\n", ulCount);
+
+ //
+ // We processed as much data as we can directly from the receive buffer so
+ // we need to return the number of bytes to allow the lower layer to
+ // update its read pointer appropriately.
+ //
+ return(ulCount);
+}
+
+//*****************************************************************************
+//
+// Handles bulk driver notifications related to the transmit channel (data to
+// the USB host).
+//
+// \param pvCBData is the client-supplied callback pointer for this channel.
+// \param ulEvent identifies the event we are being notified about.
+// \param ulMsgValue is an event-specific value.
+// \param pvMsgData is an event-specific pointer.
+//
+// This function is called by the bulk driver to notify us of any events
+// related to operation of the transmit data channel (the IN channel carrying
+// data to the USB host).
+//
+// \return The return value is event-specific.
+//
+//*****************************************************************************
+unsigned long
+TxHandler(void *pvCBData, unsigned long ulEvent, unsigned long ulMsgValue,
+ void *pvMsgData)
+{
+ //
+ // We are not required to do anything in response to any transmit event
+ // in this example. All we do is update our transmit counter.
+ //
+ if(ulEvent == USB_EVENT_TX_COMPLETE)
+ {
+ g_ulTxCount += ulMsgValue;
+ }
+
+ //
+ // Dump a debug message.
+ //
+ DEBUG_PRINT("TX complete %d\n", ulMsgValue);
+
+ return(0);
+}
+
+//*****************************************************************************
+//
+// Handles bulk driver notifications related to the receive channel (data from
+// the USB host).
+//
+// \param pvCBData is the client-supplied callback pointer for this channel.
+// \param ulEvent identifies the event we are being notified about.
+// \param ulMsgValue is an event-specific value.
+// \param pvMsgData is an event-specific pointer.
+//
+// This function is called by the bulk driver to notify us of any events
+// related to operation of the receive data channel (the OUT channel carrying
+// data from the USB host).
+//
+// \return The return value is event-specific.
+//
+//*****************************************************************************
+unsigned long
+RxHandler(void *pvCBData, unsigned long ulEvent,
+ unsigned long ulMsgValue, void *pvMsgData)
+{
+ //
+ // Which event are we being sent?
+ //
+ switch(ulEvent)
+ {
+ //
+ // We are connected to a host and communication is now possible.
+ //
+ case USB_EVENT_CONNECTED:
+ {
+ g_bUSBConfigured = true;
+ UARTprintf("Host connected.\n");
+
+ //
+ // Flush our buffers.
+ //
+ USBBufferFlush(&g_sTxBuffer);
+ USBBufferFlush(&g_sRxBuffer);
+
+ break;
+ }
+
+ //
+ // The host has disconnected.
+ //
+ case USB_EVENT_DISCONNECTED:
+ {
+ g_bUSBConfigured = false;
+ UARTprintf("Host disconnected.\n");
+ break;
+ }
+
+ //
+ // A new packet has been received.
+ //
+ case USB_EVENT_RX_AVAILABLE:
+ {
+ tUSBDBulkDevice *psDevice;
+
+ //
+ // Get a pointer to our instance data from the callback data
+ // parameter.
+ //
+ psDevice = (tUSBDBulkDevice *)pvCBData;
+
+ //
+ // Read the new packet and echo it back to the host.
+ //
+ return(EchoNewDataToHost(psDevice, pvMsgData, ulMsgValue));
+ }
+
+ //
+ // Ignore SUSPEND and RESUME for now.
+ //
+ case USB_EVENT_SUSPEND:
+ case USB_EVENT_RESUME:
+ {
+ break;
+ }
+
+ //
+ // Ignore all other events and return 0.
+ //
+ default:
+ {
+ break;
+ }
+ }
+
+ return(0);
+}
+
+//*****************************************************************************
+//
+// This is the main application entry function.
+//
+//*****************************************************************************
+int
+main(void)
+{
+ volatile unsigned long ulLoop;
+ unsigned long ulTxCount;
+ unsigned long ulRxCount;
+
+ //
+ // Enable lazy stacking for interrupt handlers. This allows floating-point
+ // instructions to be used within interrupt handlers, but at the expense of
+ // extra stack usage.
+ //
+ ROM_FPULazyStackingEnable();
+
+ //
+ // Set the clocking to run from the PLL at 50MHz
+ //
+ ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
+ SYSCTL_XTAL_16MHZ);
+
+ //
+ // Configure the relevant pins such that UART0 owns them.
+ //
+ ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
+ GPIOPinConfigure(GPIO_PA0_U0RX);
+ GPIOPinConfigure(GPIO_PA1_U0TX);
+ ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
+
+ //
+ // Enable the GPIO port that is used for the on-board LED.
+ //
+ ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
+
+ //
+ // Enable the GPIO pins for the LED (PF2 & PF3).
+ //
+ ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_3|GPIO_PIN_2);
+
+
+ //
+ // Open UART0 and show the application name on the UART.
+ //
+ UARTStdioInit(0);
+ UARTprintf("\033[2JStellaris USB bulk device example\n");
+ UARTprintf("---------------------------------\n\n");
+
+ //
+ // Not configured initially.
+ //
+ g_bUSBConfigured = false;
+
+ //
+ // Enable the GPIO peripheral used for USB, and configure the USB
+ // pins.
+ //
+ ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
+ ROM_GPIOPinTypeUSBAnalog(GPIO_PORTD_BASE, GPIO_PIN_4 | GPIO_PIN_5);
+
+ //
+ // Enable the system tick.
+ //
+ ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / SYSTICKS_PER_SECOND);
+ ROM_SysTickIntEnable();
+ ROM_SysTickEnable();
+
+ //
+ // Tell the user what we are up to.
+ //
+ UARTprintf("Configuring USB\n");
+
+ //
+ // Initialize the transmit and receive buffers.
+ //
+ USBBufferInit((tUSBBuffer *)&g_sTxBuffer);
+ USBBufferInit((tUSBBuffer *)&g_sRxBuffer);
+
+ //
+ // Set the USB stack mode to Device mode with VBUS monitoring.
+ //
+ USBStackModeSet(0, USB_MODE_FORCE_DEVICE, 0);
+
+ //
+ // Pass our device information to the USB library and place the device
+ // on the bus.
+ //
+ USBDBulkInit(0, (tUSBDBulkDevice *)&g_sBulkDevice);
+
+ //
+ // Wait for initial configuration to complete.
+ //
+ UARTprintf("Waiting for host...\n");
+
+ //
+ // Clear our local byte counters.
+ //
+ ulRxCount = 0;
+ ulTxCount = 0;
+
+ //
+ // Main application loop.
+ //
+ while(1)
+ {
+ //
+ // See if any data has been transferred.
+ //
+ if((ulTxCount != g_ulTxCount) || (ulRxCount != g_ulRxCount))
+ {
+ //
+ // Has there been any transmit traffic since we last checked?
+ //
+ if(ulTxCount != g_ulTxCount)
+ {
+ //
+ // Turn on the Green LED.
+ //
+ GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_PIN_3);
+
+ //
+ // Delay for a bit.
+ //
+ for(ulLoop = 0; ulLoop < 150000; ulLoop++)
+ {
+ }
+
+ //
+ // Turn off the Green LED.
+ //
+ GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);
+
+ //
+ // Take a snapshot of the latest transmit count.
+ //
+ ulTxCount = g_ulTxCount;
+ }
+
+ //
+ // Has there been any receive traffic since we last checked?
+ //
+ if(ulRxCount != g_ulRxCount)
+ {
+ //
+ // Turn on the Blue LED.
+ //
+ GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);
+
+ //
+ // Delay for a bit.
+ //
+ for(ulLoop = 0; ulLoop < 150000; ulLoop++)
+ {
+ }
+
+ //
+ // Turn off the Blue LED.
+ //
+ GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);
+
+ //
+ // Take a snapshot of the latest receive count.
+ //
+ ulRxCount = g_ulRxCount;
+ }
+
+ //
+ // Update the display of bytes transferred.
+ //
+ UARTprintf("\rTx: %d Rx: %d", ulTxCount, ulRxCount);
+ }
+ }
+}
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