Hello everyone,
for my graduation project, I am using a C7 ANT module to transfer data to an Android application.
The C7 module is connected in asynchronous mode @57600Baud to a SAM4S microcontroller and is configured as a single, bi-directional master channel.
I encountered the following issue: Acknowledged data transfer (master->slave) only works up to approximately 130 Hz message rate.
At higher message rates, an "event_rx_fail_0x02" is generated subsequently after receiving an acknowledged message.
The slave channel is established over ANTwareII v.4.1 and USB2 or ANTUSB-m ANT sticks (same result).
Probing the C7 module with a logic analyser revealed:
-The RTS pulse lasts about 1-2mS (config messages cause less RTS high-time but never under 0.5mS).
-The "event_transfer_tx_complete" is delayed about 6.5mS from RTS rising edged.
-The time between an "event_transfer_tx_complete" and the start of transmitting the next acknowledged packet is <80uS.
My questions:
The datasheet specifies a RTS pulse high-time of 50uS, is it abnormal for a CC2571 to generate pulses 10-40x of the specified time?
Is it generally possible to get 200Hz acknowledged message rate with the asynchronous interface @57600Baud or do I have to use fast SPI for that scenario?
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