@CHIP-RTOS C Library V2.06 - SPI API
spi_slave_init
Init the SPI Slave Interface (hardware interface) void spi_slave_init ( unsigned int mode ); Parameters
mode
- Combine the following defines with a bitwise OR to select the operation mode
SPI mode:
set on of these: SPI_MODE0, SPI_MODE1, SPI_MODE2 or SPI_MODE3
Open-Drain-Mode:
select SPI_OPEN_DRAIN for open-drain-mode,
else output mode is used
Invert chipselect:
select SPI_INVERT_CS to invert SLVSEL chipselect pin (active high),
else do not invert SLVSEL pin (active low)
Swap SDI and SDO:
select SPI_ALTERNATE_IO to swap SDI and SDO pins
Return Value
- -- none --.
Comments
- To use the SPI slave interface the user has to install an interrupt service routine
for the SPI interrupt. An interrupt occurs when the SLVSEL pin transitions from active to inactive.
A Wired-OR mode is provided which allows multiple masters to collide on the bus
without risk of damage. In this mode, an external pull-up resistor is required
on the Master Out Slave In (MOSI) and Master In Slave Out (MISO) pins.
Generally, pull-ups are recommended on all of the external SPI signals to ensure
they are held in a valid state, even when the SPI interface is disabled.
See Also
RTOS API
- This library function invokes a RTOS software interrupt.
Refer to this RTOS API function's
documentation
for more details.
Supported since or modified in @CHIP-RTOS version-
SC12 | SC13 | SC11 | SC1x3 |
-
n/a | n/a | n/a | V0.90 |
Supported by @CHIP-RTOS C Library since version
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