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modbus: stop bits can now be set individually in client mode

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Added the stop_bits_client parameter to the modbus_serial_param struct.
Being able to configure the number of stop bits for the client
independently from the parity setting, allows to support connecting to
modbus server that do not follow the MODBUS over Serial Line Specification
and Implementation Guide.

Signed-off-by: Constantin Krischke <constantin.krischke@lemonbeat.com>
Signed-off-by: Jan Geldmacher <jan.geldmacher@lemonbeat.com>
This commit is contained in:
Constantin Krischke 2021-11-16 16:14:28 +01:00 • committed by Anas Nashif
commit 8ee675946c
5 changed files with 31 additions and 2 deletions
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14
subsys/modbus/modbus_serial.c
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@ -547,6 +547,20 @@ int modbus_serial_init(struct modbus_context *ctx,
return -EINVAL;
}
if (ctx->client) {
/* Allow custom stop bit settings only in client mode */
switch (param.serial.stop_bits_client) {
case UART_CFG_STOP_BITS_0_5:
case UART_CFG_STOP_BITS_1:
case UART_CFG_STOP_BITS_1_5:
case UART_CFG_STOP_BITS_2:
uart_cfg.stop_bits = param.serial.stop_bits_client;
break;
default:
return -EINVAL;
}
}
if (uart_configure(cfg->dev, &uart_cfg) != 0) {
LOG_ERR("Failed to configure UART");
return -EINVAL;