419a398c01
Add a configurable delay between when a byte is received and MODEM_PIPE_EVENT_RECEIVE_READY is sent. This fixes data reception at baud rates above 460800, and most likely also reduces the workload at any baud rate when receiving bytes by not going through the work item and callbacks for every single byte. Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>
54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
# Copyright (c) 2023 Trackunit Corporation
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# SPDX-License-Identifier: Apache-2.0
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config MODEM_BACKEND_TTY
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bool "Modem TTY backend module"
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select MODEM_PIPE
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depends on ARCH_POSIX
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config MODEM_BACKEND_UART
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bool "Modem UART backend module"
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select MODEM_PIPE
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select RING_BUFFER
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depends on UART_INTERRUPT_DRIVEN || UART_ASYNC_API
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if MODEM_BACKEND_UART
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config MODEM_BACKEND_UART_ISR
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bool "Modem UART backend module interrupt driven implementation"
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default y if UART_INTERRUPT_DRIVEN
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config MODEM_BACKEND_UART_ASYNC
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bool "Modem UART backend module async implementation"
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default y if UART_ASYNC_API
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if MODEM_BACKEND_UART_ISR
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config MODEM_BACKEND_UART_ISR_RECEIVE_IDLE_TIMEOUT_MS
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int "Modem ISR UART delay between first byte received and RECEIVE_READY pipe event"
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default 20
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help
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This defines the delay, in milliseconds, that the backend waits
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when receiving a byte before sending the RECEIVE_READY pipe event.
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The backend will anyway send the event before this delay if buffer space runs out.
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A good value is ~90% the time it takes to fill half the receive buffer.
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It can be calculated as follows:
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(<UART receive_buf_size> / 2) / (<UART baud rate> / <UART bits per byte>) * <ms per sec>
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By default (for the modem_cellular driver): (512 / 2) / (115200 / 10) * 1000 = 22,222 => 20
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endif
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if MODEM_BACKEND_UART_ASYNC
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config MODEM_BACKEND_UART_ASYNC_TRANSMIT_TIMEOUT_MS
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int "Modem async UART transmit timeout in milliseconds"
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default 1000
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config MODEM_BACKEND_UART_ASYNC_RECEIVE_IDLE_TIMEOUT_MS
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int "Modem async UART receive idle timeout in milliseconds"
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default 30
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endif
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endif # MODEM_BACKEND_UART
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