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EFM32: Reduce writes to the CTRL register

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This commit is contained in:
Gregory Nutt 2014-11-09 09:43:43 -06:00
parent fe7bdb284e
commit 5073f3e951
1 changed files with 3 additions and 9 deletions
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12
arch/arm/src/efm32/efm32_spi.c
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@ -1574,11 +1574,11 @@ static int spi_portinitialize(struct efm32_spidev_s *priv)
regval = _USART_CTRL_RESETVALUE | USART_CTRL_SYNC | USART_CTRL_CLKPOL_IDLELOW |
USART_CTRL_CLKPHA_SAMPLELEADING;
spi_putreg(config, EFM32_USART_CTRL_OFFSET, regval);
/* MSB First */
/* MSB First, 8 bits */
regval |= USART_CTRL_MSBF;
regval &= ~_USART_FRAME_DATABITS_MASK;
regval |= USART_FRAME_DATABITS_EIGHT | USART_CTRL_MSBF;
spi_putreg(config, EFM32_USART_CTRL_OFFSET, regval);
#ifndef CONFIG_SPI_OWNBUS
@ -1588,12 +1588,6 @@ static int spi_portinitialize(struct efm32_spidev_s *priv)
priv->nbits = 8;
priv->lsbfirst = false;
/* 8 bits */
regval = USART_FRAME_DATABITS_EIGHT | USART_FRAME_STOPBITS_DEFAULT |
USART_FRAME_PARITY_DEFAULT;
spi_putreg(config, EFM32_USART_CTRL_OFFSET, regval);
/* Select a default frequency of approx. 400KHz */
spi_setfrequency((struct spi_dev_s *)priv, 400000);