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uart high speed tested

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Philippe Teuwen 2019-05-22 00:05:19 +02:00
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@ -37,7 +37,7 @@ This USART can be reached from the host client (if connected via USB-CDC) throug
So, `usart config` changes the Proxmark3 USART baudrate and parity, while e.g. `usart txrx d AT+Px` and `usart txrx d AT+BAUDx` changes the BT add-on parity and baudrate. So, `usart config` changes the Proxmark3 USART baudrate and parity, while e.g. `usart txrx d AT+Px` and `usart txrx d AT+BAUDx` changes the BT add-on parity and baudrate.
And for things to work fine, both sets have to match! And for things to work fine, both sets have to match!
Internally, the desired baudrate is converted to UART settings: a BRGR and a FP. The resulting baudrate will be close to but not always equal to the desired baudrate. Serial ports typically have some error tolerance in the actual baudrates. Theoretically < 2.5% on each side (so 5% in total), < 2% to be on the safe side. In the current firmware configuration, the Proxmark3 can provide any baudrate up to 2Mbauds with an error of max 2%, and selected baudrates up to 6Mbauds. TODO to be tested. Internally, the desired baudrate is converted to UART settings: a BRGR and a FP. The resulting baudrate will be close to but not always equal to the desired baudrate. Serial ports typically have some error tolerance in the actual baudrates. Theoretically < 2.5% on each side (so 5% in total), < 2% to be on the safe side. In the current firmware configuration, the Proxmark3 can provide any baudrate up to 2Mbauds with an error of max 2%, and selected baudrates up to 6Mbauds (tested with a FTDI C232HM DDHSL-0 cable).
## Proxmark3 FPC USART + BT add-on (blue shark) ## Proxmark3 FPC USART + BT add-on (blue shark)