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EFM32 USART setup: Computation of BAUD includes shift; Eliminate additional shift. From Pierre-noel Bouteville

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This commit is contained in:
Gregory Nutt 2014-11-16 07:57:57 -06:00
parent 37fd5c0fe0
commit c2c37abf47
1 changed files with 6 additions and 3 deletions
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9
arch/arm/src/efm32/efm32_lowputc.c
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@ -206,15 +206,18 @@ static void efm32_uart_setbaud(uintptr_t base, uint32_t baud)
clkdiv = 0;
}
/* Set up the selected oversampling and baud divisor */
/* Set up the selected oversampling */
regval = getreg32(base + EFM32_USART_CTRL_OFFSET);
regval &= ~_USART_CTRL_OVS_MASK;
regval |= ovs;
putreg32(regval, base + EFM32_USART_CTRL_OFFSET);
regval = (uint32_t)clkdiv << _USART_CLKDIV_DIV_SHIFT;
DEBUGASSERT((regval & _USART_CLKDIV_MASK) == regval);
/* Set up the selected baud divisor. The computation above already took
* in account of _USART_CLKDIV_DIV_SHIFT
*/
regval = (uint32_t)clkdiv & _USART_CLKDIV_MASK;
putreg32(regval, base + EFM32_USART_CLKDIV_OFFSET);
}
#endif