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STM32: Single wire UART support from Thomas Grubler

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This commit is contained in:
Gregory Nutt 2014-01-02 07:56:46 -06:00
parent 707922432c
commit c01e95584c
2 changed files with 15 additions and 0 deletions
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2
ChangeLog
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@ -6356,4 +6356,6 @@
tools (2013-21-31).
* configs/z16f2800100zcog/nsh: Add a Z16F NSH configuration. Does not
yet work (2014-1-1).
* arch/arm/src/stm32/stm32_serial.c: Single-wire UART support from
Thomas Grubler (2014-1-2).

13
arch/arm/src/stm32/stm32_serial.c
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@ -1744,6 +1744,18 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
uint32_t cr = up_serialin(priv, STM32_USART_CR3_OFFSET);
#if defined(CONFIG_STM32_STM32F10XX)
if (arg == SER_SINGLEWIRE_ENABLED)
{
stm32_configgpio((priv->tx_gpio & ~(GPIO_CNF_MASK)) | GPIO_CNF_AFOD);
cr |= USART_CR3_HDSEL;
}
else
{
stm32_configgpio((priv->tx_gpio & ~(GPIO_CNF_MASK)) | GPIO_CNF_AFPP);
cr &= ~USART_CR3_HDSEL;
}
#else
if (arg == SER_SINGLEWIRE_ENABLED)
{
stm32_configgpio(priv->tx_gpio | GPIO_OPENDRAIN);
@ -1754,6 +1766,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
stm32_configgpio(priv->tx_gpio | GPIO_PUSHPULL);
cr &= ~USART_CR3_HDSEL;
}
#endif
up_serialout(priv, STM32_USART_CR3_OFFSET, cr);
}