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cpu/saml21: uart: disable fractional baud rate

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SERCOM5 on SAM L21 does not support fractional baud rate mode.
Instead of special-casing it, just use arithmetic baud rate mode
in general on this CPU, as I'm not sure what the advantages of fractional
baud rate mode are.

fixes #16692
This commit is contained in:
Benjamin Valentin 2021-07-30 11:28:02 +02:00
parent 6b5a1818f1
commit ddf96f7000
1 changed files with 5 additions and 0 deletions
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5
cpu/sam0_common/periph/uart.c
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@ -38,8 +38,13 @@
/* default to fractional baud rate calculation */
#if !defined(CONFIG_SAM0_UART_BAUD_FRAC) && defined(SERCOM_USART_BAUD_FRAC_BAUD)
/* SAML21 has no fractional baud rate on SERCOM5 */
#if defined(CPU_SAML21)
#define CONFIG_SAM0_UART_BAUD_FRAC 0
#else
#define CONFIG_SAM0_UART_BAUD_FRAC 1
#endif
#endif
/* SAMD20 defines no generic macro */
#ifdef SERCOM_USART_CTRLA_TXPO_PAD0