usb-i2c, sd21, problem setting multiple servos

[kae]

hi guys, newbie here.

I have a C program (gb) talking to a USB-I2C bridge which then controls servos on an SD21.

the gb program is based on code found on this site, such that "gb 1 2200" sets the second servo to frequency 2200.

I can run it from the console perfectly, setting whatever servos I want to whatever frequencies, but when I write a bash script to set a few in quick succession, only one gets set.

Any ideas?

[chris]

Are you waiting for the USB-I2C returned byte following a packet transmission?

[Gerry]

Make sure you read the returned ACK byte from the USB-I2C after writing.
Discard it if you want, but you must read it.

[kae]

thanks! that was it. perfect! my bot takes a step towards world domination (http://www.youtube.com/watch?v=1pxOx2Fr3Zc)