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HAL_ChibiOS: scale uart rx buffer size with baudrate

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this ensures we have enough buffer space for a RTK GPS, as well as for
high speed comms with a companion computer
This commit is contained in:
Andrew Tridgell 2019-12-22 09:55:45 +11:00
parent 52e0e5e223
commit 30e51c9f64
1 changed files with 8 additions and 0 deletions
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8
libraries/AP_HAL_ChibiOS/UARTDriver.cpp
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@ -146,6 +146,14 @@ void UARTDriver::begin(uint32_t b, uint16_t rxS, uint16_t txS)
uint16_t min_tx_buffer = HAL_UART_MIN_TX_SIZE; uint16_t min_tx_buffer = HAL_UART_MIN_TX_SIZE;
uint16_t min_rx_buffer = HAL_UART_MIN_RX_SIZE; uint16_t min_rx_buffer = HAL_UART_MIN_RX_SIZE;
/*
increase min RX size to ensure we can receive a fully utilised
UART if we are running our receive loop at 40Hz. This means 25ms
of data. Assumes 10 bits per byte, which is normal for most
protocols
*/
min_rx_buffer = MAX(min_rx_buffer, b/(40*10));
if (sdef.is_usb) { if (sdef.is_usb) {
// give more buffer space for log download on USB // give more buffer space for log download on USB
min_tx_buffer *= 4; min_tx_buffer *= 4;