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Add SPI method to set SCLK mode

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1669 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-03-29 21:14:34 +00:00
parent aa7341a2a6
commit 76ef9b9572
2 changed files with 57 additions and 3 deletions
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56
arch/z80/src/ez80/ez80_spi.c
View File

@ -66,6 +66,7 @@
****************************************************************************/
static uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency);
static void spi_setmode(FAR struct spi_dev_s *dev, enum spi_mode_e mode);
static ubyte spi_sndbyte(FAR struct spi_dev_s *dev, ubyte ch);
static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, size_t buflen);
static void spi_recvblock(FAR struct spi_dev_s *dev, FAR ubyte *buffer, size_t buflen);
@ -78,6 +79,7 @@ static const struct spi_ops_s g_spiops =
{
ez80_spiselect, /* Provided externally by board logic */
spi_setfrequency,
spi_setmode,
ez80_spistatus, /* Provided externally by board logic */
spi_sndbyte,
spi_sndblock,
@ -148,6 +150,58 @@ static uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency)
return ((EZ80_SYS_CLK_FREQ+1)/2 + brg - 1) / brg;
}
/****************************************************************************
* Name: spi_setmode
*
* Description:
* Set the SPI mode. Optional. See enum spi_mode_e for mode definitions
*
* Input Parameters:
* dev - Device-specific state data
* mode - The SPI mode requested
*
* Returned Value:
* none
*
****************************************************************************/
static void spi_setmode(FAR struct spi_dev_s *dev, enum spi_mode_e mode)
{
ubyte modebits;
ubyte regval;
/* Select the CTL register bits based on the selected mode */
switch (mode)
{
case SPIDEV_MODE0: /* CPOL=0 CHPHA=0 */
modebits = 0;
break;
case SPIDEV_MODE1: /* CPOL=0 CHPHA=1 */
modebits = SPI_CTL_CPHA;
break;
case SPIDEV_MODE2: /* CPOL=1 CHPHA=0 */
modebits = SPI_CTL_CPOL;
break;
case SPIDEV_MODE3: /* CPOL=1 CHPHA=1 */
modebits = (SPI_CTL_CPOL|SPI_CTL_CPHA);
break;
default:
return;
}
/* Then set those bits in the CTL register */
regval = inp(EZ80_SPI_CTL);
regval &= ~(SPI_CTL_CPOL|SPI_CTL_CPHA);
regval |= modebits;
outp(EZ80_SPI_CTL, regval);
}
/****************************************************************************
* Name: spi_waitspif
*
@ -367,7 +421,7 @@ FAR struct spi_dev_s *up_spiinitialize(int port)
/* Enable the SPI.
* NOTE 1: Interrupts are not used in this driver version.
* NOTE 2: Certain devices may need changes to SCK polarity settings.
* NOTE 2: Initial mode is mode=0.
*/
outp(EZ80_SPI_CTL, SPI_CTL_SPIEN|SPI_CTL_MASTEREN);

4
arch/z80/src/ez80/ez80f91_spi.h
View File

@ -113,8 +113,8 @@ extern "C" {
* will bind the SPI driver to the SPI MMC/SD driver.
*/
EXTERN void ez80_spiselect(FAR struct spi_dev_s *dev, enum spidev_e devid, boolean selected);
EXTERN ubyte ez80_spistatus(FAR struct spi_dev_s *dev, enum spidev_e devid);
EXTERN void ez80_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected);
EXTERN ubyte ez80_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
#undef EXTERN
#ifdef __cplusplus