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8.1.2
SPI Access to MSP430 Mode
This mode (see
Figure
station sends data to the TMS37157, which is forwarded to the MSP430 via the SPI interface. The
MSP430 performs a certain action, depending on to the received instruction and sends back the response
data to TMS37157 via the SPI and to the base station via the RF interface.
For the button "Flash LED (with battery)":
•
The target board must be connected battery board and JP1 must be set. This drives the MSP430 from
the battery.
•
Choose which LED (green or red) should flash and enter the number of times the LED should flash. A
click on the button performs the desired action.
For the button "Flash LED (without battery)":
•
The target board must be disconnected from the battery board. The MSP430 is supplied from the
induced voltage of the magnetic field generated by the base station.
•
Choose which LED (green or red) should flash and enter the number of times the LED should flash.
Click on Flash LED (without battery) to perform the desired action. The TMS37157 target board must
be within the operating field of the base station (2 to 3 cm).
NOTE: The "Flash LED (without battery)" performs these commands:
1.
A Read Page 3 Command (check if TMS37157 is in range)
2.
A Battery Charge Command (power up MSP430 and charge capacitor)
3.
An MSP Access Command (deliver number of LED flashes to MSP430)
4.
A Battery Charge Command (power the MSP430 to drive the LEDs)
5.
A Read Page 3 Command (stop charging)
8.1.3
Check Battery Level Mode
This mode (see
Figure
1. Ensure that the battery board is connected to the target board and the jumper is set.
2. Click Check Battery. The battery status appears in the field next to the Texas Instruments logo.
8.2
Direct Access Mode
The Direct Access mode enables the user to use all functions the TMS37157 offers. Every memory page
can be read, programmed, or locked. Locked pages are read only and cannot be reprogrammed.
To read a page of the EEPROM, choose the page in the dropdown list and click Read Page.
Figure 18
shows a successful read of Page 3 of an RFID transponder. The Lock Status of the
corresponding page is displayed after every Read command execution (field on the right side shows Page
Unlocked).
SLAU281B – November 2009 – Revised March 2010
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Figure 17. TMS37157 Target Board
16, field B) perform an MSP Access Command to the TMS37157. The RFID base
16, field C) displays the charge level of the connected battery.
Copyright © 2009–2010, Texas Instruments Incorporated
eZ430-TMS37157 Demo
eZ430-TMS37157 Development Tool
19
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