121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 2013, University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
/**
|
|
* \addtogroup cc2538-spi
|
|
* @{
|
|
*
|
|
* \file
|
|
* Header file for the cc2538 SPI driver, including macros for the
|
|
* implementation of the low-level SPI primitives such as waiting for the TX
|
|
* FIFO to be ready, inserting into the TX FIFO, etc.
|
|
*/
|
|
#ifndef SPI_ARCH_H_
|
|
#define SPI_ARCH_H_
|
|
|
|
#include "dev/ssi.h"
|
|
|
|
#define SPI_WAITFORTxREADY() do { \
|
|
while(!(REG(SSI0_BASE + SSI_SR) & SSI_SR_TNF)); \
|
|
} while(0)
|
|
|
|
#define SPI_TXBUF REG(SSI0_BASE + SSI_DR)
|
|
|
|
#define SPI_RXBUF REG(SSI0_BASE + SSI_DR)
|
|
|
|
#define SPI_WAITFOREOTx() do { \
|
|
while(REG(SSI0_BASE + SSI_SR) & SSI_SR_BSY); \
|
|
} while(0)
|
|
|
|
#define SPI_WAITFOREORx() do { \
|
|
while(!(REG(SSI0_BASE + SSI_SR) & SSI_SR_RNE)); \
|
|
} while(0)
|
|
|
|
#ifdef SPI_FLUSH
|
|
#error "You must include spi-arch.h before spi.h for the CC2538."
|
|
#endif
|
|
#define SPI_FLUSH() do { \
|
|
while (REG(SSI0_BASE + SSI_SR) & SSI_SR_RNE) { \
|
|
SPI_RXBUF; \
|
|
} \
|
|
} while(0)
|
|
|
|
#define SPI_CS_CLR(port, pin) do { \
|
|
GPIO_CLR_PIN(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin)); \
|
|
} while(0)
|
|
|
|
#define SPI_CS_SET(port, pin) do { \
|
|
GPIO_SET_PIN(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin)); \
|
|
} while(0)
|
|
/*---------------------------------------------------------------------------*/
|
|
/** \name Arch-specific SPI functions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Configure a GPIO to be the chip select pin
|
|
*/
|
|
void spi_cs_init(uint8_t port, uint8_t pin);
|
|
|
|
/** \brief Enables the SPI peripheral
|
|
*/
|
|
void spi_enable(void);
|
|
|
|
/** \brief Disables the SPI peripheral
|
|
* \note Call this function to save power when the SPI is unused.
|
|
*/
|
|
void spi_disable(void);
|
|
|
|
/**
|
|
* \brief Configure the SPI data and clock polarity and the data size.
|
|
*
|
|
* This function configures the SSI peripheral to use a particular SPI
|
|
* configuration that a slave device requires. It should always be called
|
|
* before using the SPI bus as another driver could have changed the settings.
|
|
*
|
|
* See section 19.4.4 in the CC2538 user guide for more information.
|
|
*
|
|
* \param frame_format Set the SSI frame format. Use SSI_CR0_FRF_MOTOROLA,
|
|
* SSI_CR0_FRF_TI, or SSI_CR0_FRF_MICROWIRE.
|
|
* \param clock_polarity In Motorola mode, set whether the clock is high or low
|
|
* when idle. Use SSI_CR0_SPO or 0.
|
|
* \param clock_phase In Motorola mode, select whether data is valid on the
|
|
* first or second edge of the clock. Use SSI_CR0_SPH or 0.
|
|
* \param data_size The number of bits in each "byte" of data. Must be
|
|
* between 4 and 16, inclusive.
|
|
*/
|
|
void spi_set_mode(uint32_t frame_format, uint32_t clock_polarity,
|
|
uint32_t clock_phase, uint32_t data_size);
|
|
|
|
/** @} */
|
|
|
|
#endif /* SPI_ARCH_H_ */
|
|
|
|
/**
|
|
* @}
|
|
*/
|