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drivers: xmc4xxx_uart: Delay transmit interrupt until byte is sent out

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Generate the Tx service request after the symbol is shifted out of the
UART. This is useful when the UART is connected to an RS485 transducer
which has a separate transmit enable gpio/line. Hence it's important
to know when the transmission actually finishes so that the drive
enable line can be disabled.

Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
This commit is contained in:
Andriy Gelman 2024-04-25 23:38:46 -04:00 committed by Anas Nashif
parent a8ac02f9ad
commit 041f9821ca
1 changed files with 4 additions and 4 deletions
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8
drivers/serial/uart_xmc4xxx.c
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@ -116,7 +116,7 @@ static void disable_tx_events(const struct uart_xmc4xxx_config *config)
XMC_USIC_CH_TXFIFO_DisableEvent(config->uart,
XMC_USIC_CH_TXFIFO_EVENT_CONF_STANDARD);
} else {
XMC_USIC_CH_DisableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_BUFFER);
XMC_USIC_CH_DisableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_SHIFT);
}
}
#endif
@ -131,7 +131,7 @@ static void enable_tx_events(const struct uart_xmc4xxx_config *config)
XMC_USIC_CH_TXFIFO_EnableEvent(config->uart,
XMC_USIC_CH_TXFIFO_EVENT_CONF_STANDARD);
} else {
XMC_USIC_CH_EnableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_BUFFER);
XMC_USIC_CH_EnableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_SHIFT);
}
}
@ -189,7 +189,7 @@ static void uart_xmc4xxx_configure_service_requests(const struct device *dev)
data->service_request_tx);
} else {
XMC_USIC_CH_SetInterruptNodePointer(
config->uart, XMC_USIC_CH_INTERRUPT_NODE_POINTER_TRANSMIT_BUFFER,
config->uart, XMC_USIC_CH_INTERRUPT_NODE_POINTER_TRANSMIT_SHIFT,
data->service_request_tx);
}
@ -338,7 +338,7 @@ static void uart_xmc4xxx_irq_tx_disable(const struct device *dev)
XMC_USIC_CH_TXFIFO_DisableEvent(config->uart,
XMC_USIC_CH_TXFIFO_EVENT_CONF_STANDARD);
} else {
XMC_USIC_CH_DisableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_BUFFER);
XMC_USIC_CH_DisableEvent(config->uart, XMC_USIC_CH_EVENT_TRANSMIT_SHIFT);
}
}