Atmel AT91EB01, Руководство пользователя

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Setting Up the AT91EB01 Evaluation Board
AT91EB01 Evaluation Board User Manual 3-7
- Transfer one character from USART 0 to USART 0 (loopback mode)
- Transfer one character from USART 1 to USART 1 (loopback mode)
- Transfer one character from USART 0 to USART 1 (normal mode)
- Transfer one character from USART 1 to USART 0 (normal mode)
For each case, the green or the red LED blinks once following the positive or nega-
tive result of the test. Note that the 2nd and 3rd tests can succeed only if the straight
serial cable (provided) is connected between SERIAL A and SERIAL B.
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If the IRQ0 button is pressed, the buses of the SRAM are tested:
- Address bus
- Data bus
In each case, the green or the red LED blinks once following the positive or negative
result of the test.
3.7.5 The SRAM
Downloader The SRAM downloader is a part of the boot software and allows an application in the
SRAM to be loaded at the address 0x02000000, then activated. It is started by the boot
if the button TIOB1 is pressed at reset.
The procedure is as follows:
1. Connect the AT91EB01 to the host PC using either the straight serial cable (pro-
vided) on the serial A, or a crossed serial cable (not provided) on the serial B.
2. Set the clock frequency (LK2) to the desired frequency. Note that this directly
determines the baud rate for the download (cf. table below).
3. Generate a power on or a RESET with the TIOB1 pressed down.Wait for the red
LED to light up and then release the TIOB1 button.
4. Start the BINCOM utility, located in the folder “<MyFolderAT91>\Tools”, on the
host computer: Select the port and the baud rate for communications, then open
the file to download and send it. Wait for the end of the transfer.
5. Press the button IRQ0 to terminate the download. The control is switched to the
address 0x02000000.
If the downloaded program is Angel, start the ARM debugger (first exit BINCOM). Refer
to the section “Communicating with Angel” on page 3-11 for more details.
The following table shows the relationship between the clock rate on the board, and the
serial baud rate:
Table 3-1. Clock Rate vs. Serial Baud Rate
Note that if the debugger is started through ICE while the SRAM downloader is on, then
both serial channels are enabled.
3.7.6 The Angel Monitor The Angel monitor is located in the flash from 0x01002000 up to 0x0100FFFF. It is
started by the boot if neither TIOB1 nor FIQ are pressed at reset. Refer to the section
“Communicating with Angel” on page 3-11 and “Using Angel” on page 3-12 for more
details.
The latest version of the Angel debugger is included in the AT91 library in the folder
“<MyFolderAT91>\Tools“, file “Angeleb01.exf”. The file “Angeleb01.txt” contains the cor-
responding prompt printed in the Console window at Angel startup.
The Angel on the AT91EB01 can be upgraded regardless of the version programmed on
it. Refer to the section “Using the Flash Downloader” on page 3-13 for more details.
Frequency Serial A Serial B
16 MHz 57600 19200
32 MHz (MASTER) 115200 38400