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drivers/xbee: disable CTS/RTS pin unless periph_uart_hw_fc is used

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If usinng an arduino xbee shield then CTS pin will be wired to the
ICSP connector RESET pin.

If also used on an arduino-% board then if xbee is busy sending or
receiving data it will assert CTS and this will trigger a reset on
the board.

To avoid this disable CTS functionality on start up unless hardware
flow control is explicitly requested.
This commit is contained in:
Francisco Molina 2020-01-28 17:58:17 +01:00
parent e9d2fdb29b
commit 922b35da2d
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GPG Key ID: 3E94EAC3DBDEEDA8
1 changed files with 8 additions and 0 deletions
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8
drivers/xbee/xbee.c
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@ -599,6 +599,14 @@ int xbee_init(netdev_t *dev)
_at_cmd(xbee, "ATMM2\r");
/* put XBee module in "API mode without escaped characters" */
_at_cmd(xbee, "ATAP1\r");
/* disable xbee CTS and RTS, unless hardware flow control is used */
if(!IS_USED(MODULE_PERIPH_UART_HW_FC)) {
DEBUG("[xbee] init: WARNING if using an arduino BOARD + arduino xbee " \
"shield with ICSP connector, hardware flow control can't be " \
"used since CTS pin is connected to ICSP RESET pin\n");
_at_cmd(xbee, "ATD6 0\r");
_at_cmd(xbee, "ATD7 0\r");
}
/* apply AT commands */
_at_cmd(xbee, "ATAC\r");
/* exit command mode */