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Adding constants for spiFlags 

Added several constants to ease SPI configuration
This commit is contained in:
BjoernSch 2016-08-10 20:51:00 +02:00
parent 09f56eb728
commit c5a1cc5e35
1 changed files with 39 additions and 12 deletions
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51
pigpio.py
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@ -363,6 +363,19 @@ FROM_START=0
FROM_CURRENT=1 FROM_CURRENT=1
FROM_END=2 FROM_END=2
SPI_CS_HIGH_ACTIVE = 1 << 2
SPI_CS0_HIGH_ACTIVE = 1 << 2
SPI_CS1_HIGH_ACTIVE = 1 << 3
SPI_CS2_HIGH_ACTIVE = 1 << 4
SPI_RX_LSBFIRST = 1 << 15
SPI_TX_LSBFIRST = 1 << 14
SPI_MODE_0 = 0
SPI_MODE_1 = 1
SPI_MODE_2 = 2
SPI_MODE_3 = 3
SPI_CPOL = 2
SPI_CPHA = 1
# pigpio command numbers # pigpio command numbers
_PI_CMD_MODES= 0 _PI_CMD_MODES= 0
@ -2979,30 +2992,44 @@ class pi():
b b b b b b R T n n n n W A u2 u1 u0 p2 p1 p0 m m b b b b b b R T n n n n W A u2 u1 u0 p2 p1 p0 m m
... ...
mm defines the SPI mode. mm defines the SPI mode, defaults to 0
... ...
Mode POL PHA Mode CPOL CPHA
0 0 0 0 0 0
1 0 1 1 0 1
2 1 0 2 1 0
3 1 1 3 1 1
... ...
p0 is 0 if CEx is active low (default) and 1 for active high. Use the following constants to set the Mode:
pigpio.SPI_MODE_0,
pigpio.SPI_MODE_1,
pigpio.SPI_MODE_2 or
pigpio.SPI_MODE_3
or use
pigpio.SPI_CPOL and/ or
pigpio.SPI_CPHA
p0 is 0 if CS is active low (default) and 1 for active high.
Use pigpio.SPI_CS_HIGH_ACTIVE to set this flag.
T is 1 if the least significant bit is transmitted on MOSI first, T is 1 if the least significant bit is transmitted on MOSI first,
the default (0) shifts the most significant bit out first. the default (0) shifts the most significant bit out first.
Use pigpio.SPI_TX_LSBFIRST to set this flag.
R is 1 if the least significant bit is received on MISO first, the R is 1 if the least significant bit is received on MISO first,
default (0) receives the most significant bit first. the default (0) receives the most significant bit first.
Use pigpio.SPI_RX_LSBFIRST to set this flag.
The other bits in flags should be set to zero. The other bits in spiFlags should be set to zero.
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_SPI_BAUD, or Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_SPI_BAUD, or
PI_GPIO_IN_USE. PI_GPIO_IN_USE.
... ...
pi.bb_spi_open(CS, MISO, MOSI, SCLK, baud=100000, spi_flags=1) pi.bb_spi_open(CS, MISO, MOSI, SCLK,
baud=100000,
spi_flags=pigpio.SPI_MODE_1 | pigpio.SPI_CS_HIGH_ACTIVE)
... ...
""" """
# I p1 CS # I p1 CS