spi_host_hw

SPI host

Author	William Welch Copyright © 2009..2025, all rights reserved.
Adapted-by	Sebastien Lelong, Rob Jansen
Compiler	2.5r9

Description

SPI host hardware control.
             Routines for sending and receiving through the SPI in host mode

Sources

Good overview of SPI at http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus
         Also at: http://elm-chan.org/docs/spi_e.html

Dependencies

Summary

spi_host_hw_set_mode_10()

Clock SPI data when SCK goes from high to low. SCK is inactive high.

spi_host_hw_set_mode_01()

Clock SPI data when SCK goes from high to low. SCK is inactive low.

spi_host_hw'put(byte in data)

Half-duplex convenience function. send data to slave, discard reply.

spi_host_hw_set_mode_00()

Clock SPI data when SCK goes from low to high. SCK is low inactive low.

spi_host_hw_set_mode(byte in spi_mode)

Specify SPI mode. See spi_common.jal for predefined constants you can use
as parameter.

spi_host_hw_set_speed(byte in spi_rate)

Set the SPI host speed, see spi_common.jal. Some newer PICs have a separate 
baud rate register, in that case SCK = Fosc / (2 * (spi_rate + 1)).

spi_init(byte in spi_mode, byte in spi_rate)

Initialize the SPI registers and enable the SPI interface.

spi_host_hw_set_mode_11()

Clock SPI data when SCK goes from low to high. SCK is inactive high.

spi_host_hw'get() return byte

Half-duplex convenience function. send 0xFF, get slave data.

spi_host_hw_exchange(byte in m_data) return byte

SPI is full-duplex, so we exchange host and slave data byte.

Here are the list of samples which use this library: