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Add support for UART hardware flow control

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This allows assigning platform pins to the CTS/RTS lines.
If provided, these will be muxed as UART when flow control is enabled.

Signed-off-by: Nicola Lunghi <nicola.lunghi@emutex.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Nicola Lunghi
2017-04-05 14:10:39 +01:00
committed by Brendan Le Foll
parent 6185f0ac92
commit 45127e04b9
2 changed files with 26 additions and 0 deletions
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2
include/mraa_internal_types.h
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@@ -372,6 +372,8 @@ typedef struct {
unsigned int index; /**< ID as exposed in the system */
int rx; /**< uart rx */
int tx; /**< uart tx */
int cts; /**< uart cts */
int rts; /**< uart rts */
char* device_path; /**< To store "/dev/ttyS1" for example */
/*@}*/
} mraa_uart_dev_t;

24
src/uart/uart.c
View File

@@ -2,6 +2,7 @@
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Contributions: Jon Trulson <jtrulson@ics.com>
* Brendan le Foll <brendan.le.foll@intel.com>
* Nicola Lunghi <nicola.lunghi@emutex.com>
* Copyright (c) 2014 - 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
@@ -609,6 +610,29 @@ mraa_uart_set_flowcontrol(mraa_uart_context dev, mraa_boolean_t xonxoff, mraa_bo
return dev->advance_func->uart_set_flowcontrol_replace(dev, xonxoff, rtscts);
}
if (rtscts) {
// assign the CTS and RTS pin to UART when enabling flow control
if (!plat->no_bus_mux) {
int pos_cts = plat->uart_dev[dev->index].cts;
int pos_rts = plat->uart_dev[dev->index].rts;
if ((pos_cts >= 0) && (pos_rts >= 0)) {
if (plat->pins[pos_cts].uart.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos_cts].uart) != MRAA_SUCCESS) {
syslog(LOG_ERR, "uart%i: init: failed to setup muxes for CTS pin", dev->index);
return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
}
}
if (plat->pins[pos_rts].uart.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos_rts].uart) != MRAA_SUCCESS) {
syslog(LOG_ERR, "uart%i: init: failed to setup muxes for RTS pin", dev->index);
return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
}
}
}
}
}
// hardware flow control
int action = TCIOFF;
if (xonxoff) {