sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

SAMV7 SPI: Add support for Peripheral Chip Select Decoding to address up to 15 slaved

Browse Source
This commit is contained in:
Frank Benkert 2016-02-24 13:47:15 -06:00 committed by Gregory Nutt
parent 9c9107171d
commit c263fe1c8b
3 changed files with 81 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/src/samv7/Kconfig
View File

@ -738,6 +738,12 @@ endchoice # SPI1 Configuration
if SAMV7_SPI_MASTER
comment "SPI Master Configuration"
config SAMV7_SPI_CS_DECODING
bool "SPI Peripheral Chip Select Decoding"
default n
---help---
Use Peripheral Chip Select Decoding on SPI Master
config SAMV7_SPI_DMA
bool "SPI DMA"
default n

12
arch/arm/src/samv7/sam_spi.c
View File

@ -601,7 +601,11 @@ static inline void spi_flush(struct sam_spidev_s *spi)
static inline uint32_t spi_cs2pcs(struct sam_spics_s *spics)
{
#ifndef CONFIG_SAMV7_SPI_CS_DECODING
return ((uint32_t)1 << (spics->cs)) - 1;
#else
return spics->cs;
#endif
}
/****************************************************************************
@ -1843,6 +1847,14 @@ FAR struct spi_dev_s *sam_spibus_initialize(int port)
}
#endif
#if defined(CONFIG_SAMV7_SPI_CS_DECODING)
/* Enable Peripheral Chip Select Decoding? */
regval = spi_getreg(spi, SAM_SPI_MR_OFFSET);
regval |= SPI_MR_PCSDEC;
spi_putreg(spi, regval, SAM_SPI_MR_OFFSET);
#endif
/* Disable SPI clocking */
spi_putreg(spi, SPI_CR_SPIDIS, SAM_SPI_CR_OFFSET);

81
arch/arm/src/samv7/sam_spi.h
View File

@ -63,26 +63,71 @@
* sam_spibus_initialize().
*/
#define __SPI_CS_SHIFT (0) /* Bits 0-1: SPI chip select number */
#define __SPI_CS_MASK (3 << __SPI_CS_SHIFT)
# define __SPI_CS0 (0 << __SPI_CS_SHIFT)
# define __SPI_CS1 (1 << __SPI_CS_SHIFT)
# define __SPI_CS2 (2 << __SPI_CS_SHIFT)
# define __SPI_CS3 (3 << __SPI_CS_SHIFT)
#define __SPI_SPI_SHIFT (2) /* Bit 2: SPI controller number */
#define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
#ifdef CONFIG_SAMV7_SPI_CS_DECODING
# define __SPI_CS_SHIFT (0) /* Bits 0-3: SPI chip select number */
# define __SPI_CS_MASK (15 << __SPI_CS_SHIFT)
#define SPI0_CS0 (__SPI_SPI0 | __SPI_CS0)
#define SPI0_CS1 (__SPI_SPI0 | __SPI_CS1)
#define SPI0_CS2 (__SPI_SPI0 | __SPI_CS2)
#define SPI0_CS3 (__SPI_SPI0 | __SPI_CS3)
# define __SPI_SPI_SHIFT (4) /* Bit 4: SPI controller number */
# define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
#define SPI1_CS0 (__SPI_SPI1 | __SPI_CS0)
#define SPI1_CS1 (__SPI_SPI1 | __SPI_CS1)
#define SPI1_CS2 (__SPI_SPI1 | __SPI_CS2)
#define SPI1_CS3 (__SPI_SPI1 | __SPI_CS3)
# define SPI0_CS0 (__SPI_SPI0 | 1)
# define SPI0_CS1 (__SPI_SPI0 | 2)
# define SPI0_CS2 (__SPI_SPI0 | 3)
# define SPI0_CS3 (__SPI_SPI0 | 4)
# define SPI0_CS4 (__SPI_SPI0 | 5)
# define SPI0_CS5 (__SPI_SPI0 | 6)
# define SPI0_CS6 (__SPI_SPI0 | 7)
# define SPI0_CS7 (__SPI_SPI0 | 8)
# define SPI0_CS8 (__SPI_SPI0 | 9)
# define SPI0_CS9 (__SPI_SPI0 | 10)
# define SPI0_CS10 (__SPI_SPI0 | 11)
# define SPI0_CS11 (__SPI_SPI0 | 12)
# define SPI0_CS12 (__SPI_SPI0 | 13)
# define SPI0_CS13 (__SPI_SPI0 | 14)
# define SPI0_CS14 (__SPI_SPI0 | 15)
# define SPI1_CS0 (__SPI_SPI1 | 1)
# define SPI1_CS1 (__SPI_SPI1 | 2)
# define SPI1_CS2 (__SPI_SPI1 | 3)
# define SPI1_CS3 (__SPI_SPI1 | 4)
# define SPI1_CS4 (__SPI_SPI1 | 5)
# define SPI1_CS5 (__SPI_SPI1 | 6)
# define SPI1_CS6 (__SPI_SPI1 | 7)
# define SPI1_CS7 (__SPI_SPI1 | 8)
# define SPI1_CS8 (__SPI_SPI1 | 9)
# define SPI1_CS9 (__SPI_SPI1 | 10)
# define SPI1_CS10 (__SPI_SPI1 | 11)
# define SPI1_CS11 (__SPI_SPI1 | 12)
# define SPI1_CS12 (__SPI_SPI1 | 13)
# define SPI1_CS13 (__SPI_SPI1 | 14)
# define SPI1_CS14 (__SPI_SPI1 | 15)
#else /* CONFIG_SAMV7_SPI_CS_DECODING */
# define __SPI_CS_SHIFT (0) /* Bits 0-1: SPI chip select number */
# define __SPI_CS_MASK (3 << __SPI_CS_SHIFT)
# define __SPI_CS0 (0 << __SPI_CS_SHIFT)
# define __SPI_CS1 (1 << __SPI_CS_SHIFT)
# define __SPI_CS2 (2 << __SPI_CS_SHIFT)
# define __SPI_CS3 (3 << __SPI_CS_SHIFT)
# define __SPI_SPI_SHIFT (2) /* Bit 2: SPI controller number */
# define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
# define SPI0_CS0 (__SPI_SPI0 | __SPI_CS0)
# define SPI0_CS1 (__SPI_SPI0 | __SPI_CS1)
# define SPI0_CS2 (__SPI_SPI0 | __SPI_CS2)
# define SPI0_CS3 (__SPI_SPI0 | __SPI_CS3)
# define SPI1_CS0 (__SPI_SPI1 | __SPI_CS0)
# define SPI1_CS1 (__SPI_SPI1 | __SPI_CS1)
# define SPI1_CS2 (__SPI_SPI1 | __SPI_CS2)
# define SPI1_CS3 (__SPI_SPI1 | __SPI_CS3)
#endif /* CONFIG_SAMV7_SPI_CS_DECODING */
/****************************************************************************
* Public Types