USBX MSC device function USBD_STORAGE_Write() parameters
Hi,
I am running firmware for USBX MSC device. The example project "Ux_Device_MSC" on demo board STM32U575I-EV. MSC device is enumerated on computer and FATS file system is used. It can transfer file from computer to storage on STM32U575I-EV. I am trying to figure out the following parameters.
1. how many times the following function in source file "ux_device_msc.c" is called when transfer a large file
UINT USBD_STORAGE_Write(VOID *storage_instance, ULONG lun, UCHAR *data_pointer, ULONG number_blocks, ULONG lba, ULONG *media_status)
{
UINT status = UX_SUCCESS;
/* USER CODE BEGIN USBD_STORAGE_Write */
UX_PARAMETER_NOT_USED(storage_instance);
UX_PARAMETER_NOT_USED(lun);
UX_PARAMETER_NOT_USED(media_status);
ULONG WriteFlags = 0U;
/* Check if the SD card is present */
if (HAL_GPIO_ReadPin(GPIOI, GPIO_PIN_0) == GPIO_PIN_SET)
{
/* Check id SD card is ready */
if(check_sd_status() != HAL_OK)
{
Error_Handler();
}
/* Start the Dma write */
status = HAL_SD_WriteBlocks_DMA(&hsd1, data_pointer, lba, number_blocks);
if(status != HAL_OK)
{
Error_Handler();
}
/* Wait on writeflag until SD card is ready to use for new operation */
if (tx_event_flags_get(&EventFlag, SD_WRITE_FLAG, TX_OR_CLEAR, &WriteFlags, TX_WAIT_FOREVER) != TX_SUCCESS)
{
Error_Handler();
}
}
/* USER CODE END USBD_STORAGE_Write */
return status;
}
2. What is the parameter *data_pointer, number_blocks and lba are when transfer
a large file from computer to storage.
I run debug mode and set break point at line: status = HAL_SD_WriteBlocks_DMA(&hsd1, data_pointer, lba, number_blocks);
Yet, I am not able to run to this endpoint. May I know the values or how to know the values of parameters
in question 1 and 2?
Thank you very much.
Edited to apply source code formatting - please see How to insert source code for future reference.