Platform:
TM4C129XNCZAD microcontroller based custom board (based on DK reference design)
TI-ARM compiler 5.2.5
TI-RTOS 2.1.4
FATFs enabled
Hello,
I have modified the TI-RTOS Tiva USB driver to support USB hub and is working. Is able to detect the Mass storage device as well the USB Hub.
I have multi task application, and below are two tasks in the application, where i am facing issues
1. USB task --> enumerates the USB Mass Storage device and terminates
2. log task --> log data into USB drive
The USB drive is enumerated correctly and I am able to log data into USB drive for the 1st time. Subsequent attempts at writing to USB drive fails. The "fopen" returns an NULL even though the "fopen" is called with append plus flage ( "a+").
I did a debug by single stepping into fopen and it gets DEV_BUSY and return NULL
I have attached the code for both tasks as well as the data logging function.
Can anyone please point me where am going wrong and why is the fopen call returning DEV_BUSY, even though I have flushed and closed the file?
Thanks in advance
Narendra
#define LOG_DATA_LEN 648
/* String conversion macro */
#define STR_(n) #n
#define STR(n) STR_(n)
#define USB_DRIVE_NUM 1
char outputfile[] = "fat:"STR(USB_DRIVE_NUM)":output.txt";
void initTask(UArg arg0, UArg arg1)
{
/* Other variables */
USBMSCHFatFs_Handle usbmschfatfsHandle;
USBMSCHFatFs_Params usbmschfatfsParams;
....
/* Other variables */
......
/* Other Init code */
......
/* Mount and register the USB Drive */
USBMSCHFatFs_Params_init(&usbmschfatfsParams);
usbmschfatfsParams.serviceTaskStackPtr = usbServiceTaskStack;
usbmschfatfsParams.serviceTaskStackSize = sizeof(usbServiceTaskStack);
usbmschfatfsHandle = USBMSCHFatFs_open(UI_BOARD_USBMSCHFatFs0,
USB_DRIVE_NUM,
&usbmschfatfsParams);
if (usbmschfatfsHandle == NULL) {
System_abort("Error starting the USB Drive\n");
}
else {
/* Need to block until a USB Drive has been enumerated */
if (USBMSCHFatFs_waitForConnect(usbmschfatfsHandle, 10000))
{
driveMounted = true; /* Global variable if USB drive is enumerated */
}
else
{
USBMSCHFatFs_close(usbmschfatfsHandle);
}
}
}
/* Task for logging data */
void LoggingTask(UArg arg0, UArg arg1)
{
while(1)
{
uint32_t events;
events = Event_pend(ButtonEvent, Event_Id_NONE, (Event_Id_00 + Event_Id_01 + Event_Id_02 + Event_Id_03 + \
Event_Id_04 + Event_Id_05 + Event_Id_06),BIOS_WAIT_FOREVER);
if(events & Event_Id_00)
{
retValue = LogDataToUSB();
}
....
.... /* Other events handled */
}
}
int8_t LogDataToUSB(void)
{
FILE *dst;
/* Variables to keep track of the file copy progress */
uint32_t bytesWritten = 0;
unsigned int len = LOG_DATA_LEN;
if(driveMounted == true)
{
/* Create a new file object for the file copy */
dst = fopen(outputfile,"a+");
if (dst)
{
/* Global array filled with logged data */
bytesWritten = fwrite(logData, 1, len, dst);
if (bytesWritten == len)
{
/* flush the contents of the stream */
len = fflush(dst);
if (len == 0)
{
/* Close file */
len = fclose(dst);
if (len == 0)
{
return 0;
}
}
}
}
}
return -1;
}
