SDCARD task question

davidzhou — Mon, 13 Jun 2016 14:35:39 GMT

Hi,

I have a K60 tower board: TWRK60F120MUM.

I have observed an interesting MQX programming topic related to the SDCard task. I hope some expert can point me where is the issue.

I worked out SD card init, open file, and write file based on demo.c of the SDCard task. Summaried here:

I moved FILE pointers as global to retain the handle valves:

The SDCard_Init runs as a task. (as demo.c)

volatile MQX_FILE_PTR	ghComHandle=NULL;
volatile MQX_FILE_PTR	ghFileSystem=NULL;
volatile MQX_FILE_PTR	gphSDCard=NULL, gphPartition=NULL;

void SDCard_Init(uint32_t temp)

{

bool	inserted = TRUE, readonly = FALSE, last = FALSE;
ghComHandle = fopen(BSP_SDCARD_ESDHC_CHANNEL, (void *)(SPI_FLAG_FULL_DUPLEX));

_io_sdcard_install("sdcard:", (void *)&_bsp_sdcard0_init, ghComHandle);

inserted =1;//!lwgpio_get_value(&sd_detect); always inserted

for (;;) {

if (last != inserted) {

	last = inserted;
	if (inserted) {
	gphSDCard = fopen("sdcard:", 0);
	_io_part_mgr_install(gphSDCard, partman_name, 0);
	gphPartition = fopen(partition_name, NULL);
	_io_ioctl(gphPartition, IO_IOCTL_VAL_PART, NULL);
	// Install MFS over partition
	_io_mfs_install(gphPartition, filesystem_name, 0);
	ghFileSystem = fopen(filesystem_name, NULL);
	//LogFileOpen();
	giSdCardReady=1;
	}
	else { //never closed
	}
	}

}

In the Main Task, wait until giSdCardReady=1. Then call LogFileOpen().

uint8_t LogFileOpen() {

int error_code=0;

MQX_FILE_PTR fd_ptrWrite ;

fd_ptrWrite = fopen("a:myfile2.txt", "w+");

}

fopen() opens successfully. It works.

Because SDCard_Init runs at lower priority and the SDCard is always inserted. So the task really runs only once. for initialization of SD card. So I call the SDCard_Init() as a function in the Main task, instead of running as a task.

Then call to LogFileOpen() fails to open the file.

Main_Task{

SDCard_init(); //when called as function, the for (;;) is commented out, so it only runs once.

LogFileOpen(); //fails

}

That is the first question: why SDCard_Init has to be run as a task. Main() is a task, too. Why can not call the SDCard_init()?

Then I copy all the code of the SDCard_init() into Main task as follows:

Main_Task{

// SDCard_init();

bool	inserted = TRUE, readonly = FALSE, last = FALSE;
ghComHandle = fopen(BSP_SDCARD_ESDHC_CHANNEL, (void *)(SPI_FLAG_FULL_DUPLEX));

_io_sdcard_install("sdcard:", (void *)&_bsp_sdcard0_init, ghComHandle);

inserted =1;//!lwgpio_get_value(&sd_detect); always inserted

if (1) {

if (last != inserted) {

	last = inserted;
	if (inserted) {
	gphSDCard = fopen("sdcard:", 0);
	_io_part_mgr_install(gphSDCard, partman_name, 0);
	gphPartition = fopen(partition_name, NULL);
	_io_ioctl(gphPartition, IO_IOCTL_VAL_PART, NULL);
	// Install MFS over partition
	_io_mfs_install(gphPartition, filesystem_name, 0);
	ghFileSystem = fopen(filesystem_name, NULL);
	//LogFileOpen();
	giSdCardReady=1;
	}
	else { //never closed
	}
	}

}

LogFileOpen(); //it works

}

I don't understand that why in the Main task, SDCard_init() (as a funtion) can not be called, and LogFileOpen() fails. and if the exact same code of SDCard_init() has to be embedded into the Main Task in order to make LogFileOpen work?

What I have missed?

Thank you,

David Zhou

Re: SDCARD task question

danielchen — Thu, 16 Jun 2016 07:53:17 GMT

Hi David:

Could you please create a simple project for this?

Regards

Daniel

Re: SDCARD task question

davidzhou — Thu, 16 Jun 2016 13:38:23 GMT

Hi Daniel ,

Give me some time. I will create a sample project when I have time.

Thank you,

David Zhou

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