/*********************************************************************
* Function: void APP_HostMSDDataLoggerTasks(void);
*
* Overview: Keeps the demo running.
*
* PreCondition: The demo should have been initialized via
* the APP_HostMSDDataLoggerInitialize()
*
* Input: None
*
* Output: None
*
********************************************************************/
void APP_HostMSDDataLoggerTasks()
{
if(FILEIO_MediaDetect(&gUSBDrive, &deviceAddress) == false)
{
//The device has been removed. Now we should wait for a new
// device to be attached.
demoState = WAITING_FOR_ATTACH;
}
switch( demoState)
{
case WAITING_FOR_ATTACH:
break;
case MOUNTING_DRIVE:
{
// Attempt to mount the drive described by gUSBDrive as drive 'A'
// The deviceAddress parameter describes the USB address of the device; it is initialized by the application in the
// USB_ApplicationEventHandler function when a new device is detected.
if( FILEIO_DriveMount ('A', &gUSBDrive, &deviceAddress) == FILEIO_ERROR_NONE)
{
demoState = OPENING_FILE;
}
break;
}
case OPENING_FILE:
// Opening a file with the FILEIO_OPEN_WRITE option allows us to write to the file.
// Opening a file with the FILEIO_OPEN_CREATE file will create the file if it does not already exist.
// Opening a file with the FILEIO_OPEN_TRUNCATE file will truncate it to a 0-length file if it already exists.
if(FILEIO_Open(&myFile, "LOG.CSV", FILEIO_OPEN_WRITE | FILEIO_OPEN_CREATE | FILEIO_OPEN_TRUNCATE) == FILEIO_RESULT_SUCCESS)
{
//Opening the file failed. Since we can't write to the
// device, abort the write attempt and wait for the device
// to be removed.
demoState = WRITING_TO_FILE;
blinkCount = 0;
sampleRequested = false;
TIMER_RequestTick(&APP_HostMSDDataLoggerTickHandler, 50);
LED_On(LED_USB_HOST_MSD_DATA_LOGGER);
ADC_ChannelEnable(ADC_USB_HOST_MSD_DATA_SOURCE);
break;
}
break;
case WRITING_TO_FILE:
if(sampleRequested == true)
{
uint16_t adcResult;
int charCount;
sampleRequested = false;
adcResult = ADC_Read10bit(ADC_USB_HOST_MSD_DATA_SOURCE);
charCount = sprintf(printBuffer, "%d\r\n", adcResult);
//Write some data to the new file.
FILEIO_Write(printBuffer, 1, charCount, &myFile);
}
if(BUTTON_IsPressed(BUTTON_USB_HOST_MSD_DATA_LOGGER) == true)
{
demoState = CLOSING_FILE;
}
break;
case CLOSING_FILE:
//Always make sure to close the file so that the data gets
// written to the drive.
FILEIO_Close(&myFile);
TIMER_CancelTick(&APP_HostMSDDataLoggerTickHandler);
demoState = UNMOUNT_DRIVE;
break;
case UNMOUNT_DRIVE:
// Unmount the drive since it is no longer in use.
FILEIO_DriveUnmount ('A');
//Now that we are done writing, we can do nothing until the
// drive is removed.
demoState = WAITING_FOR_DETACH;
break;
case WAITING_FOR_DETACH:
LED_Off(LED_USB_HOST_MSD_DATA_LOGGER);
break;
default:
break;
}
}
/*********************************************************************
* Function: void APP_HostMSDSimpleTasks(void);
*
* Overview: Keeps the demo running.
*
* PreCondition: The demo should have been initialized via
* the APP_HostMSDSimpleInitialize()
*
* Input: None
*
* Output: None
*
********************************************************************/
void APP_HostMSDSimpleTasks()
{
switch(demoState)
{
case WAITING_FOR_ATTACH:
break;
case WRITING_TO_DEVICE:
if(FILEIO_MediaDetect(&gUSBDrive, &deviceAddress) == true)
{
//Now that we've found a device, we can try to write to it.
demoState = WRITING_TO_DEVICE;
}
else
{
break;
}
// Attempt to mount the drive described by gUSBDrive as drive 'A'
// The deviceAddress parameter describes the USB address of the device; it is initialized by the application in the
// USB_ApplicationEventHandler function when a new device is detected.
if(FILEIO_DriveMount ('A', &gUSBDrive, &deviceAddress) == FILEIO_ERROR_NONE)
{
// Opening a file with the FILEIO_OPEN_WRITE option allows us to write to the file.
// Opening a file with the FILEIO_OPEN_CREATE file will create the file if it does not already exist.
// Opening a file with the FILEIO_OPEN_TRUNCATE file will truncate it to a 0-length file if it already exists.
if(FILEIO_Open(&myFile, "TEST.TXT", FILEIO_OPEN_WRITE | FILEIO_OPEN_CREATE | FILEIO_OPEN_TRUNCATE) == FILEIO_RESULT_FAILURE)
{
//Opening the file failed. Since we can't write to the
// device, abort the write attempt and wait for the device
// to be removed.
demoState = WAITING_FOR_DETACH;
break;
}
//Write some data to the new file.
FILEIO_Write("This is a test.", 1, 15, &myFile);
//Always make sure to close the file so that the data gets
// written to the drive.
FILEIO_Close(&myFile);
// Unmount the drive since it is no longer in use.
FILEIO_DriveUnmount ('A');
//Now that we are done writing, we can do nothing until the
// drive is removed.
demoState = WAITING_FOR_DETACH;
}
break;
case WAITING_FOR_DETACH:
if(FILEIO_MediaDetect(&gUSBDrive, &deviceAddress) == false)
{
//The device has been removed. Now we should wait for a new
// device to be attached.
demoState = WAITING_FOR_ATTACH;
}
break;
}
}
