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cpu/msp430/periph_uart: Fix uart_write() for USCI peripheral #20572

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merged 1 commit into from
Apr 15, 2024
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cpu/msp430/periph_uart: Fix uart_write() for USCI peripheral #20572

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7 changes: 7 additions & 0 deletions cpu/msp430/periph/uart_usci.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2015 Freie Universität Berlin
* 2024 Marian Buschsieweke
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
Expand All @@ -15,6 +16,7 @@
* @brief Low-level UART driver implementation
*
* @author Hauke Petersen <[email protected]>
* @author Marian Buschsieweke <[email protected]>
*
* @}
*/
Expand Down Expand Up @@ -130,6 +132,11 @@ void uart_write(uart_t uart, const uint8_t *data, size_t len)
usci->dev->TXBUF = *data++;
}

while (usci->dev->STAT & UCBUSY) {
/* busy wait for completion, e.g. to avoid losing chars/bits
* before releasing the USCI in TX only mode. */
}

if (tx_only) {
msp430_usci_release(usci);
}
Expand Down
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