nes-proj/platform/srf06-cc26xx/common/board-spi.c

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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 sensortag-cc26xx-spi
* @{
*
* \file
* Board-specific SPI driver common to the Sensortag and LaunchPad
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*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "ti-lib.h"
#include "board-spi.h"
#include "board.h"
#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
static bool
accessible(void)
{
/* First, check the PD */
if(ti_lib_prcm_power_domain_status(PRCM_DOMAIN_SERIAL)
!= PRCM_DOMAIN_POWER_ON) {
return false;
}
/* Then check the 'run mode' clock gate */
if(!(HWREG(PRCM_BASE + PRCM_O_SSICLKGR) & PRCM_SSICLKGR_CLK_EN_SSI0)) {
return false;
}
return true;
}
/*---------------------------------------------------------------------------*/
bool
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board_spi_write(const uint8_t *buf, size_t len)
{
if(accessible() == false) {
return false;
}
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while(len > 0) {
uint32_t ul;
ti_lib_ssi_data_put(SSI0_BASE, *buf);
ti_lib_rom_ssi_data_get(SSI0_BASE, &ul);
len--;
buf++;
}
return true;
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}
/*---------------------------------------------------------------------------*/
bool
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board_spi_read(uint8_t *buf, size_t len)
{
if(accessible() == false) {
return false;
}
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while(len > 0) {
uint32_t ul;
if(!ti_lib_rom_ssi_data_put_non_blocking(SSI0_BASE, 0)) {
/* Error */
return false;
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}
ti_lib_rom_ssi_data_get(SSI0_BASE, &ul);
*buf = (uint8_t)ul;
len--;
buf++;
}
return true;
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}
/*---------------------------------------------------------------------------*/
void
board_spi_flush()
{
if(accessible() == false) {
return;
}
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uint32_t ul;
while(ti_lib_rom_ssi_data_get_non_blocking(SSI0_BASE, &ul));
}
/*---------------------------------------------------------------------------*/
void
board_spi_open(uint32_t bit_rate, uint32_t clk_pin)
{
uint32_t buf;
/* First, make sure the SERIAL PD is on */
ti_lib_prcm_power_domain_on(PRCM_DOMAIN_SERIAL);
while((ti_lib_prcm_power_domain_status(PRCM_DOMAIN_SERIAL)
!= PRCM_DOMAIN_POWER_ON));
/* Enable clock in active mode */
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ti_lib_rom_prcm_peripheral_run_enable(PRCM_PERIPH_SSI0);
ti_lib_prcm_load_set();
while(!ti_lib_prcm_load_get());
/* SPI configuration */
ti_lib_ssi_int_disable(SSI0_BASE, SSI_RXOR | SSI_RXFF | SSI_RXTO | SSI_TXFF);
ti_lib_ssi_int_clear(SSI0_BASE, SSI_RXOR | SSI_RXTO);
ti_lib_rom_ssi_config_set_exp_clk(SSI0_BASE, ti_lib_sys_ctrl_clock_get(),
SSI_FRF_MOTO_MODE_0,
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SSI_MODE_MASTER, bit_rate, 8);
ti_lib_rom_ioc_pin_type_ssi_master(SSI0_BASE, BOARD_IOID_SPI_MISO,
BOARD_IOID_SPI_MOSI, IOID_UNUSED, clk_pin);
ti_lib_ssi_enable(SSI0_BASE);
/* Get rid of residual data from SSI port */
while(ti_lib_ssi_data_get_non_blocking(SSI0_BASE, &buf));
}
/*---------------------------------------------------------------------------*/
void
board_spi_close()
{
/* Power down SSI0 */
ti_lib_rom_prcm_peripheral_run_disable(PRCM_PERIPH_SSI0);
ti_lib_prcm_load_set();
while(!ti_lib_prcm_load_get());
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/* Restore pins to a low-consumption state */
ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_MISO);
ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_MISO, IOC_IOPULL_DOWN);
ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_MOSI);
ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_MOSI, IOC_IOPULL_DOWN);
ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_CLK_FLASH);
ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_CLK_FLASH, IOC_IOPULL_DOWN);
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}
/*---------------------------------------------------------------------------*/
/** @} */