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HAL_ChibiOS: allow for up to 12.5MBps on H7 UARTs

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use 8x oversampling instead of 16x oversampling
This commit is contained in:
Andrew Tridgell 2023-12-29 07:27:02 +11:00
parent c1016ae52e
commit 0a8faa83d9
1 changed files with 12 additions and 0 deletions
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12
libraries/AP_HAL_ChibiOS/UARTDriver.cpp
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@ -430,6 +430,18 @@ void UARTDriver::_begin(uint32_t b, uint16_t rxS, uint16_t txS)
sercfg.cr2 = _cr2_options;
sercfg.cr3 = _cr3_options;
#if defined(STM32H7)
/*
H7 defaults to 16x oversampling. To get the highest
possible baudrates we need to drop back to 8x
oversampling. The H7 UART clock is 100MHz. This allows
for up to 12.5MBps on H7 UARTs
*/
if (_baudrate > 100000000UL / 16U) {
sercfg.cr1 |= USART_CR1_OVER8;
}
#endif
#ifndef HAL_UART_NODMA
if (rx_dma_enabled) {
sercfg.cr1 |= USART_CR1_IDLEIE;