sm_host: DTE DTR#9
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Implement PIPE interface to Serial Modem UART to be able to use the same UART implementation for both pure AT-commands and for CMUXed AT-commands and PPP. Signed-off-by: Markus Lassila <markus.lassila@nordicsemi.no>
Work in progress: Not ready. Terms: Data Terminal Equipment (DTE), AKA. host. Data Communication Equipment (DCE), AKA. SLM. Data Terminal Ready (DTR) Ring Indicate (RI) DTR operation: When DCE notices DTR asserted fom DTE, it resumes UART, enables RX and sends any possibly pending TX data. When DCE notices DTR deasserted from DTE, it aborts possible TX, disables RX and suspends UART. RI operation: When DCE observes DTR deasserted and it needs to send data, it sets RI up to notify DTE. Application integration: * uart_rx_enable is used as indicator that application is ready. * UART_RX_BUF_REQUEST is sent by virtual UART to application to request a buffer. * Logic level 1 is asserted, use DT to change 0/1 level of that. TODO: * sw_dtr should not keep RX buffers. Instead when RX is enabled, feed buffer to UART from application call. * When buffer is needed, make a callback to app to request a buffer. * When UART is powered down because of DTR, block RX_STOP and RX_DISABLE events going to application, so app thinks the UART keeps on going. Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no> Signed-off-by: Markus Lassila <markus.lassila@nordicsemi.no>
Signed-off-by: Markus Lassila <markus.lassila@nordicsemi.no>
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sm_host: DTE implementation of DTR.