core: Add software UART implementation
This patch brings a Work-in-Progress implementation of the software
UART (Universal Asynchronous Receiver/Transmitter) to libosmocore.
Not only it will be useful in the context of retro-networking, but
also it's needed for the MS-side CSD implementation (see OS#4396).
It should be noted that the definition of struct osmo_soft_uart
is intentionally kept private, since the API is not stable yet.
Currently, the following limitations apply:
* Only the receiver part is implemented, the transmitter is TBD.
* Parity checking is not implemented in the receiver part.
* Software flow control is not implemented.
These missing components will be addressed in subsequent patches.
Change-Id: I2ca95963fd5852ddb89bdd35b86b31489127fe84
diff --git a/src/core/libosmocore.map b/src/core/libosmocore.map
index e5f8bd8..c08d3ff 100644
--- a/src/core/libosmocore.map
+++ b/src/core/libosmocore.map
@@ -439,6 +439,13 @@
osmo_sock_set_priority;
osmo_sock_unix_init;
osmo_sock_unix_init_ofd;
+osmo_soft_uart_alloc;
+osmo_soft_uart_configure;
+osmo_soft_uart_enable;
+osmo_soft_uart_rx_ubits;
+osmo_soft_uart_tx_ubits;
+osmo_soft_uart_tx;
+osmo_soft_uart_set_status;
osmo_stat_item_dec;
osmo_stat_item_flush;
osmo_stat_item_for_each_group;