diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-10-11 22:33:37 +0000 |
---|---|---|
committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-10-11 22:33:37 +0000 |
commit | d5bf70ab21252ec9fb7513a9a87b317e6b20901a (patch) | |
tree | 40a079c20c68a8dc1ec984b936b7d6f333b425c6 /nuttx/configs/mcu123-lpc214x | |
parent | 1e2003f9a3eeca77c8bd8afdd8b94539c6a937fc (diff) | |
download | px4-nuttx-d5bf70ab21252ec9fb7513a9a87b317e6b20901a.tar.gz px4-nuttx-d5bf70ab21252ec9fb7513a9a87b317e6b20901a.tar.bz2 px4-nuttx-d5bf70ab21252ec9fb7513a9a87b317e6b20901a.zip |
minor interface refinements
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1035 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs/mcu123-lpc214x')
-rw-r--r-- | nuttx/configs/mcu123-lpc214x/src/up_spi.c | 151 |
1 files changed, 103 insertions, 48 deletions
diff --git a/nuttx/configs/mcu123-lpc214x/src/up_spi.c b/nuttx/configs/mcu123-lpc214x/src/up_spi.c index e63b03a7d..a9bf42246 100644 --- a/nuttx/configs/mcu123-lpc214x/src/up_spi.c +++ b/nuttx/configs/mcu123-lpc214x/src/up_spi.c @@ -88,12 +88,12 @@ ****************************************************************************/ static void spi_select(boolean select); -static uint32 spi_setclockfrequency(uint32 frequency); +static uint32 spi_setfrequency(uint32 frequency); static ubyte spi_status(void); -static ubyte spi_sndbyte(ubyte c); -static ubyte spi_waitready(void); -static void spi_sndblock(ubyte *data, int datlen); -static void spi_recvblock(ubyte *data, int datlen); +static void spi_sndbyte(ubyte ch); +static int spi_waitready(void); +static void spi_sndblock(FAR const ubyte *data, int datlen); +static void spi_recvblock(FAR ubyte *data, int datlen); /**************************************************************************** * Private Data @@ -102,7 +102,7 @@ static void spi_recvblock(ubyte *data, int datlen); static const struct spi_ops_s g_spiops = { .select = spi_select, - .setclockfrequency = spi_setclockfrequency, + .setfrequency = spi_setfrequency, .status = spi_status, .sndbyte = spi_sndbyte, .waitready = spi_waitready, @@ -122,7 +122,13 @@ static const struct spi_ops_s g_spiops = * Name: spi_select * * Description: - * MMC chip-select control + * Enable/disable the SPI chip select + * + * Input Parameters: + * select: TRUE: chip selected, FALSE: chip de-selected + * + * Returned Value: + * None * ****************************************************************************/ @@ -161,26 +167,20 @@ void spi_select(boolean select) } /**************************************************************************** - * Name: spi_status + * Name: spi_setfrequency + * * Description: - * Return MMC present + write protect status + * Set the SPI frequency. * - ****************************************************************************/ - -ubyte spi_status(void) -{ - return SPI_STATUS_PRESENT; -} - -/**************************************************************************** - * Name: spi_setclockfrequency + * Input Parameters: + * frequency: The SPI frequency requested * - * Description: - * Set SPI clock frequency + * Returned Value: + * Returns the actual frequency selected * ****************************************************************************/ -uint32 spi_setclockfrequency(uint32 frequency) +uint32 spi_setfrequency(uint32 frequency) { uint32 divisor = LPC214X_PCLKFREQ / frequency; @@ -199,14 +199,43 @@ uint32 spi_setclockfrequency(uint32 frequency) } /**************************************************************************** + * Name: spi_status + * + * Description: + * Get SPI/MMC status + * + * Input Parameters: + * None + * + * Returned Value: + * Returns a bitset of status values (see SPI_STATUS_* defines + * + ****************************************************************************/ + +ubyte spi_status(void) +{ + /* I don't think there is anyway to determine these things on the mcu123.com + * board. + */ + + return SPI_STATUS_PRESENT; +} + +/**************************************************************************** * Name: spi_sndbyte * * Description: - * Transfer one byte to the SPI + * Send one byte on SPI + * + * Input Parameters: + * ch - the byte to send + * + * Returned Value: + * None * ****************************************************************************/ -ubyte spi_sndbyte(ubyte c) +void spi_sndbyte(ubyte ch) { /* Wait while the TX FIFO is full */ @@ -214,22 +243,31 @@ ubyte spi_sndbyte(ubyte c) /* Send the byte */ - putreg16(c, LPC214X_SPI1_DR); + putreg16(ch, LPC214X_SPI1_DR); /* Wait for the RX FIFO not empty */ while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE)); - /* Return the value from the RX FIFO */ + /* Get the value from the RX FIFO */ - return (ubyte)getreg16(LPC214X_SPI1_DR); + (void)getreg16(LPC214X_SPI1_DR); } /**************************************************************************** * Name: spi_waitready + * + * Description: + * Wait for SPI to be ready + * + * Input Parameters: None + * + * Returned Value: + * OK if no error occured; a negated errno otherwise. + * ****************************************************************************/ -ubyte spi_waitready(void) +int spi_waitready(void) { ubyte ret; @@ -249,18 +287,25 @@ ubyte spi_waitready(void) } while (ret != 0xff); - return ret; + return OK; } /************************************************************************* * Name: spi_sndblock * * Description: - * Read a block of bytes from SPI + * Send a block of data on SPI * - *************************************************************************/ + * Input Parameters: + * data - A pointer to the buffer of data to be sent + * datlen - the length of data to send from the buffer + * + * Returned Value: + * None + * + ****************************************************************************/ -void spi_sndblock(ubyte *data, int datlen) +void spi_sndblock(FAR const ubyte *data, int datlen) { /* Loop while thre are bytes remaining to be sent */ @@ -293,11 +338,18 @@ void spi_sndblock(ubyte *data, int datlen) * Name: spi_recvblock * * Description: - * Receive a block of bytes from SPI + * Revice a block of data from SPI + * + * Input Parameters: + * data - A pointer to the buffer in which to recieve data + * datlen - the length of data that can be received in the buffer * - *************************************************************************/ + * Returned Value: + * None + * + ****************************************************************************/ -static void spi_recvblock(ubyte *data, int datlen) +static void spi_recvblock(FAR ubyte *data, int datlen) { uint32 fifobytes = 0; @@ -339,14 +391,29 @@ static void spi_recvblock(ubyte *data, int datlen) * Description: * Initialize the selected SPI port * + * Input Parameter: + * Port number (for hardware that has mutiple SPI interfaces) + * + * Returned Value: + * Valid vtable pointer on succcess; NULL on failure + * ****************************************************************************/ -void up_spiinitialize(int port) +FAR const struct spi_ops_s *up_spiinitialize(int port) { uint32 regval32; ubyte regval8; int i; + /* Only the SPI1 interface is supported */ + +#ifdef CONFIG_DEBUG + if (port != 1) + { + return NULL; + } +#endif + /* Configure multiplexed pins as connected on the mcu123.com board: * * PINSEL1 P0.17/CAP1.2/SCK1/MAT1.2 Bits 2-3=10 for SCK1 @@ -386,7 +453,7 @@ void up_spiinitialize(int port) /* Set the initial clock frequency for indentification mode < 400kHz */ - spi_setclockfrequency(400000); + spi_setfrequency(400000); /* Enable the SPI */ @@ -397,18 +464,6 @@ void up_spiinitialize(int port) { (void)getreg16(LPC214X_SPI1_DR); } -} - -/**************************************************************************** - * Name: up_spigetvtable - * - * Description: - * Return the vtable for the selected SPI port - * - ****************************************************************************/ -FAR const struct spi_ops_s *up_spigetvtable(int port) -{ return &g_spiops; } - |