diff options
Diffstat (limited to 'nuttx/configs/mcu123-lpc214x/src/up_spi.c')
| -rw-r--r-- | nuttx/configs/mcu123-lpc214x/src/up_spi.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/nuttx/configs/mcu123-lpc214x/src/up_spi.c b/nuttx/configs/mcu123-lpc214x/src/up_spi.c index f9949a7ea..d8ae8baf8 100644 --- a/nuttx/configs/mcu123-lpc214x/src/up_spi.c +++ b/nuttx/configs/mcu123-lpc214x/src/up_spi.c @@ -2,7 +2,7 @@ * config/mcu123-lpc214x/src/up_spi.c * arch/arm/src/board/up_spi.c * - * Copyright (C) 2008-2009 Gregory Nutt. All rights reserved. + * Copyright (C) 2008-2010 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <spudmonkey@racsa.co.cr> * * Redistribution and use in source and binary forms, with or without @@ -123,6 +123,9 @@ * Private Function Prototypes ****************************************************************************/ +#ifndef CONFIG_SPI_OWNBUS +static int spi_lock(FAR struct spi_dev_s *dev, bool lock); +#endif static void spi_select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected); static uint32_t spi_setfrequency(FAR struct spi_dev_s *dev, uint32_t frequency); static uint8_t spi_status(FAR struct spi_dev_s *dev, enum spi_dev_e devid); @@ -136,7 +139,9 @@ static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *buffer, size_t static const struct spi_ops_s g_spiops = { - .lock = 0, /* Not yet implemented */ +#ifndef CONFIG_SPI_OWNBUS + .lock = spi_lock, +#endif .select = spi_select, .setfrequency = spi_setfrequency, .status = spi_status, @@ -157,6 +162,36 @@ static struct spi_dev_s g_spidev = { &g_spiops }; ****************************************************************************/ /**************************************************************************** + * Name: spi_lock + * + * Description: + * On SPI busses where there are multiple devices, it will be necessary to + * lock SPI to have exclusive access to the busses for a sequence of + * transfers. The bus should be locked before the chip is selected. After + * locking the SPI bus, the caller should then also call the setfrequency, + * setbits, and setmode methods to make sure that the SPI is properly + * configured for the device. If the SPI buss is being shared, then it + * may have been left in an incompatible state. + * + * Input Parameters: + * dev - Device-specific state data + * lock - true: Lock spi bus, false: unlock SPI bus + * + * Returned Value: + * None + * + ****************************************************************************/ + +#ifndef CONFIG_SPI_OWNBUS +static int spi_lock(FAR struct spi_dev_s *dev, bool lock) +{ + /* Not implemented */ + + return -ENOSYS; +} +#endif + +/**************************************************************************** * Name: spi_select * * Description: |