ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 960

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

39.6.8.9
39.6.8.10
39.6.8.11
39.6.8.12
960
960
SAM3U Series
SAM3U Series
Data OUT
Bulk OUT or Interrupt OUT
Bulk OUT or Interrupt OUT: Receiving a Packet Under Application Control (Host to Device)
Bulk OUT or Interrupt OUT: Sending a Buffer Using DMA (Host To Device)
Like data IN, data OUT packets are sent by the host during the data or the status stage of con-
trol transfer or during an interrupt/bulk/isochronous OUT transfer. Data buffers are sent packet
by packet under the control of the application or under the control of the DMA channel.
Algorithm Description for Each Packet:
Note:
Algorithm to Fill Several Packets:
If the application doesn’t know the size of the receive buffer, instead of using the BUSY_BANK
interrupt, the application must use RX_BK_RDY.
To use the DMA setting, the AUTO_VALID field is mandatory.
See
information.
DMA Configuration Example:
• The application enables an interrupt on RX_BK_RDY.
• When an interrupt on RX_BK_RDY is received, the application knows that UDPHS_EPTSTAx
• The application reads the BYTE_COUNT bytes from the endpoint.
• The application clears RX_BK_RDY.
• The application enables the interrupts of BUSY_BANK and AUTO_VALID.
• When a BUSY_BANK interrupt is received, the application knows that all banks available for
1. First program UDPHS_DMAADDRESSx with the address of the buffer that should be
2. Enable the interrupt of the DMA in UDPHS_IEN
3. Program the DMA Channelx Control Register:
before the end of the microframe. The third bank has not been validated, but three
transactions have been set in NB_TRANS.
register BYTE_COUNT bytes have been received.
the endpoint have been filled. Thus, the application can read all banks available.
39.6.8.6 Bulk IN or Interrupt IN: Sending a Buffer Using DMA (Device to Host)
transferred.
– Size of buffer to be sent.
– END_B_EN: Can be used for OUT packet truncation (discarding of unbuffered
– END_BUFFIT: Generate an interrupt when BUFF_COUNT in the
– END_TR_EN: End of transfer enable, the UDPHS device can put an end to the
packet data) at the end of DMA buffer.
UDPHS_DMASTATUSx register reaches 0.
current DMA transfer, in case of a short packet.
If the application does not know the size of the transfer, it may not be a good option to use
AUTO_VALID. Because if a zero-length-packet is received, the RX_BK_RDY is automatically
cleared by the AUTO_VALID hardware and if the endpoint interrupt is triggered, the software will
not find its originating flag when reading the UDPHS_EPTSTAx register.
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11
for more