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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-05-15 01:15:52 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-05-15 01:15:52 +0000 |
commit | abcc509bf98d1a87b05ee17dffa700ffaacaf30b (patch) | |
tree | 645b3e63abbf7dc0d84436c404fcce1050c8c047 /nuttx/arch/z80/src | |
parent | c6c6c52fdb8e2fe474563b71437d80f4d3c67e59 (diff) | |
download | px4-nuttx-abcc509bf98d1a87b05ee17dffa700ffaacaf30b.tar.gz px4-nuttx-abcc509bf98d1a87b05ee17dffa700ffaacaf30b.tar.bz2 px4-nuttx-abcc509bf98d1a87b05ee17dffa700ffaacaf30b.zip |
In progress changes for OLED display work
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2669 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/z80/src')
-rwxr-xr-x | nuttx/arch/z80/src/ez80/ez80_spi.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/nuttx/arch/z80/src/ez80/ez80_spi.c b/nuttx/arch/z80/src/ez80/ez80_spi.c index 6c5f7f2aa..22cfd789c 100755 --- a/nuttx/arch/z80/src/ez80/ez80_spi.c +++ b/nuttx/arch/z80/src/ez80/ez80_spi.c @@ -1,7 +1,7 @@ /**************************************************************************** * arch/z80/src/ez80/ez80_spi.c * - * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Copyright (C) 2009-2010 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <spudmonkey@racsa.co.cr> * * Redistribution and use in source and binary forms, with or without @@ -67,6 +67,9 @@ * Private Function Prototypes ****************************************************************************/ +#ifndef CONFIG_SPI_OWNBUS +static int spi_lock(FAR struct spi_dev_s *dev, bool lock); +#endif static uint32_t spi_setfrequency(FAR struct spi_dev_s *dev, uint32_t frequency); static void spi_setmode(FAR struct spi_dev_s *dev, enum spi_mode_e mode); @@ -82,7 +85,9 @@ static void spi_recvblock(FAR struct spi_dev_s *dev, FAR uint8_t *buffer, static const struct spi_ops_s g_spiops = { - 0, /* lock() method not yet implemented */ +#ifndef CONFIG_SPI_OWNBUS + spi_lock, +#endif ez80_spiselect, /* Provided externally by board logic */ spi_setfrequency, spi_setmode, @@ -110,6 +115,36 @@ 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_setfrequency * * Description: |