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CC2530: ztool : znp device detected only some times

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

Hi,

we am working on zStack 302  znp project.

we are try in to use ztool, and have configured the znp project to use the uart interface(on port 0).

we run the znp project in debug mode and then start the ztool.

Some time the connection is established success fully while most of the time the device is not detected on the ztool.

we can see the connected znp device in the device manager (com port)

what may be the issue?

Only change made in znp project is :

#define ZNP_CFG1_SPI             0         /* use SPI transport */ // previously 1
#define ZNP_CFG1_UART            1         /* use UART transport */ // previously 0