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cpu/sam0_common: UART: simplify init sequence

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We don't need to read-modify-write the CTRLA register to disable
the UART.
The entire CTRLA register is re-written just a few lines below, so
we can just set it to 0 to disable the UART.

There is also no need to reset the UART since we re-write all config
registers in init.
This commit is contained in:
Benjamin Valentin 2020-06-21 23:18:31 +02:00
parent 28c1c502bc
commit e1f84de6c5
1 changed files with 1 additions and 1 deletions
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2
cpu/sam0_common/periph/uart.c
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@ -129,7 +129,7 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
}
/* must disable here first to ensure idempotency */
dev(uart)->CTRLA.reg &= ~(SERCOM_USART_CTRLA_ENABLE);
dev(uart)->CTRLA.reg = 0;
#ifdef MODULE_PERIPH_UART_NONBLOCKING
/* set up the TX buffer */