diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_serial.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_serial.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_serial.c b/nuttx/arch/arm/src/stm32/stm32_serial.c index bfb64b26a..6aaecb2d9 100644 --- a/nuttx/arch/arm/src/stm32/stm32_serial.c +++ b/nuttx/arch/arm/src/stm32/stm32_serial.c @@ -1,7 +1,7 @@ /**************************************************************************** * arch/arm/src/stm32/stm32_serial.c * - * Copyright (C) 2009-2012 Gregory Nutt. All rights reserved. + * Copyright (C) 2009-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -1439,6 +1439,31 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg) } break; +#ifdef CONFIG_STM32_USART_SINGLEWIRE + case TIOCSSINGLEWIRE: + { + /* Change the TX port to be open-drain/push-pull and enable/disable + * half-duplex mode. + */ + + uint32_t cr = up_serialin(priv, STM32_USART_CR3_OFFSET); + + if (arg == SER_SINGLEWIRE_ENABLED) + { + stm32_configgpio(priv->tx_gpio | GPIO_OPENDRAIN); + cr |= USART_CR3_HDSEL; + } + else + { + stm32_configgpio(priv->tx_gpio | GPIO_PUSHPULL); + cr &= ~USART_CR3_HDSEL; + } + + up_serialout(priv, STM32_USART_CR3_OFFSET, cr); + } + break; +#endif + #ifdef CONFIG_SERIAL_TERMIOS case TCGETS: { |