This document discusses using UART communication between a PC and a wireless sensor board. It provides an overview of the hardware and software components used, including the BoardAPI, HardwareAPI, and stack. A sample code example is presented to illustrate how to initialize and use the on-chip UART to communicate ASCII codes between the PC's serial port and the wireless sensor board. Pseudocode and a flowchart are included to outline the main steps. Requirements and bonuses are proposed, such as controlling LEDs on the sensor board based on keyboard input and sending button press feedback over UART. Configuration details for the PC's HyperTerminal serial port are listed in an appendix.

1. Wireless Networks
Lab – UART
2007/10/24

2. yctseng: 2
Environment
 BoardAPI
 vLedControl(0, true);
 HardwareAPI
 vAHI_xxx( );
 FontalBSP
 FontalButton -- btn_init();
 FontalLED -- led_init();
 Stack – 802.15.4 MAC
 Application Queue API
 Service Access Point – AppApi.h
 Access functions and structures used by the application to
interact with the Jennic 802.15.4 stack
 u32AppApiInit ();
 E_AHI_DEVICE_SYSCTRL, E_AHI_DEVICE_UART0, …, and
etc.

3. yctseng: 3
Sample
 The PC’s UART connects to the on-chip UART of the
FT6250 Kit. This sample code can let us figure out
how to communicate between them with UART.
 HardwareAPI
u8UartPort: E_AHI_UART_0 or E_AHI_UART_1
u8BaudRate: 38400
vAHI_UartEnable(E_AHI_UART_0);
vAHI_UartReset(E_AHI_UART_0, TRUE, TRUE);
vAHI_UartReset(E_AHI_UART_0, FALSE, FALSE);
vAHI_UartSetClockDivisor(E_AHI_UART_0, u8BaudRate);
vAHI_UartSetControl(E_AHI_UART_0, FALSE, FALSE,
E_AHI_UART_WORD_LEN_8, TRUE, FALSE);

4. yctseng: 4
Overview
 Connecting the sensor board to a PC using the programming cable.
 UART settings are in Appendix.
Terminal
Serial Port
FT 6250
UART
Typing in HyperTerminal:
ex: aaaaabbbcc
which UART ASCII code

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Flowchart
While (TRUE);
Callback
Function
Is UART0 ?
UART1
Feedback;
UART0
Feedback;
interrupt
YES NO

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Pseudo code
1. u32AHI_Init();
2. u32AppApiInit(NULL, NULL, NULL,
NULL, NULL, NULL);
3. Set up UART;
4. Init LED;
5. Register UART Callback;
6. Utility function:
• vUartPrint();
• vByteToString();

7. yctseng: 7
Requirement
Review
 After comprehending the usage of UART, you are
asked to
 When typing in the terminal, you should control each of the
LEDs on/off through UART.
 When pressing each button of FT device, you should get
different feedback in your terminal through UART.

8. yctseng: 8
Bonus
 Implement a small game.
UART_1
FT 6251
UART_1
Terminal
Serial Port
UART_0
FT6250

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Appendix
 When using HyperTerminal, you should choose the serial port
you used and configure the serial connection as follows: 38400
bps, 8 data bits, no parity, 1 stop bit, and no handshaking.
 Ensure that your HyperTerminal is started after powering up the
FT device.