Data transfer to serial port via USB - Example with ADuCM350

Hi Jimmy,

  Check out the following code for transferring an array of data via USB (Bulk transfer):-

#include "ADuCM350_device.h"

pADI_USB->DMA_ADDR0 = 0Xyyyy; /*0xyyyy = Memory address of the data block to send*/

pADI_USB->DMA_CNT0 = 0Xzzzz; /*0xzzzz = Data block size*/

pADI_USB->DMA_CTL0 |= 0X0F; /*DMA enable (D0) = 1; direction (D1) = 1; DMA mode (D2) = 1; interrupt enable (D3) = 1;*/

pADI_USB->INTRTXE |= 0x1; /*Assuming endpoint 0*/

pADI_USB->TXCSR |= 0x9400;/*Set the AUTOSET (D15), DMAREQEN (D12), and DMAREQMODE (D10)  to 1*/

When the FIFO in the USB controller becomes available, the DMA controller requests the bus mastership and transfers a packet to the FIFO. With AUTOSET set, the USB controller automatically sets the TXPKTRDY bit. This process continues until the entire data block has been transferred to the USB controller. (Refer to pg.181 of ADUCM350 HRM)

 Regrads,

Akila

Hi Akila,

Thanks a lot. But there is no possibility to "select DMA_ADDR0" for instance. The struct "p_ADI_USB" only contains the following pointer:

  pADI_USB->DMA->ADDR

Should I use this one ?

This is the same with "pADI_USB->TXCSR" that does not exist, but this variant exists:

pADI_USB->EP->TXCSR_P |= 0x9400;

Another question, how can I set the speed and a defined port in the serial COM port for communication with the PC ?

Best,

Jimmy

Hi Jimmy,

       That's right. Use 

 pADI_USB->DMA->ADDR = 0xyyyy;  

 pADI_USB->DMA->CNT = 0xzzzz; 

 pADI_USB->DMA->CTL |= 0x0F;

and

 pADI_USB->EP->TXCSR_P |= 0x9400;

Hi Akila,

Thanks a lot for that.

I am also wondering how I could send data to the serial COM port of the computer ? Can I set a baudrate, fixed port, and so on ?

Best Regards,

Jimmy

Hi Jimmy,

                  Are you using USB to RS232/RS422 converter, connecting USB end to microcontroller and RS232 end to COM port of PC? Is this the setup?

Or is it the RS232 COM port connected to UART port of microcontroller?..