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* Fail all SSI0 operations if the module is not powered and clocked * Make sure SERIAL is powered before trying to enable run mode clock
165 lines
5.3 KiB
C
165 lines
5.3 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup sensortag-cc26xx-spi
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* @{
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*
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* \file
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* Board-specific SPI driver for the Sensortag-CC26xx
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "ti-lib.h"
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#include "board-spi.h"
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#include "board.h"
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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#define CPU_FREQ 48000000ul
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/*---------------------------------------------------------------------------*/
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static bool
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accessible(void)
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{
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/* First, check the PD */
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if(ti_lib_prcm_power_domain_status(PRCM_DOMAIN_SERIAL)
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!= PRCM_DOMAIN_POWER_ON) {
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return false;
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}
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/* Then check the 'run mode' clock gate */
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if(!(HWREG(PRCM_BASE + PRCM_O_SSICLKGR) & PRCM_SSICLKGR_CLK_EN_SSI0)) {
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return false;
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}
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return true;
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}
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/*---------------------------------------------------------------------------*/
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int
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board_spi_write(const uint8_t *buf, size_t len)
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{
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if(accessible() == false) {
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return 0;
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}
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while(len > 0) {
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uint32_t ul;
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ti_lib_ssi_data_put(SSI0_BASE, *buf);
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ti_lib_rom_ssi_data_get(SSI0_BASE, &ul);
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len--;
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buf++;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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board_spi_read(uint8_t *buf, size_t len)
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{
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if(accessible() == false) {
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return 0;
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}
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while(len > 0) {
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uint32_t ul;
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if(!ti_lib_rom_ssi_data_put_non_blocking(SSI0_BASE, 0)) {
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/* Error */
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return -1;
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}
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ti_lib_rom_ssi_data_get(SSI0_BASE, &ul);
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*buf = (uint8_t)ul;
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len--;
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buf++;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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board_spi_flush()
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{
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if(accessible() == false) {
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return;
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}
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uint32_t ul;
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while(ti_lib_rom_ssi_data_get_non_blocking(SSI0_BASE, &ul));
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}
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/*---------------------------------------------------------------------------*/
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void
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board_spi_open(uint32_t bit_rate, uint32_t clk_pin)
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{
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uint32_t buf;
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/* First, make sure the SERIAL PD is on */
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ti_lib_prcm_power_domain_on(PRCM_DOMAIN_SERIAL);
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while((ti_lib_prcm_power_domain_status(PRCM_DOMAIN_SERIAL)
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!= PRCM_DOMAIN_POWER_ON));
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/* Enable clock in active mode */
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ti_lib_rom_prcm_peripheral_run_enable(PRCM_PERIPH_SSI0);
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ti_lib_prcm_load_set();
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while(!ti_lib_prcm_load_get());
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/* SPI configuration */
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ti_lib_ssi_int_disable(SSI0_BASE, SSI_RXOR | SSI_RXFF | SSI_RXTO | SSI_TXFF);
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ti_lib_ssi_int_clear(SSI0_BASE, SSI_RXOR | SSI_RXTO);
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ti_lib_rom_ssi_config_set_exp_clk(SSI0_BASE, CPU_FREQ, SSI_FRF_MOTO_MODE_0,
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SSI_MODE_MASTER, bit_rate, 8);
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ti_lib_rom_ioc_pin_type_ssi_master(SSI0_BASE, BOARD_IOID_SPI_MISO,
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BOARD_IOID_SPI_MOSI, IOID_UNUSED, clk_pin);
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ti_lib_ssi_enable(SSI0_BASE);
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/* Get rid of residual data from SSI port */
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while(ti_lib_ssi_data_get_non_blocking(SSI0_BASE, &buf));
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}
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/*---------------------------------------------------------------------------*/
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void
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board_spi_close()
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{
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/* Power down SSI0 */
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ti_lib_rom_prcm_peripheral_run_disable(PRCM_PERIPH_SSI0);
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ti_lib_prcm_load_set();
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while(!ti_lib_prcm_load_get());
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/* Restore pins to a low-consumption state */
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ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_MISO);
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ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_MISO, IOC_IOPULL_DOWN);
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ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_MOSI);
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ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_MOSI, IOC_IOPULL_DOWN);
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ti_lib_ioc_pin_type_gpio_input(BOARD_IOID_SPI_CLK_FLASH);
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ti_lib_ioc_io_port_pull_set(BOARD_IOID_SPI_CLK_FLASH, IOC_IOPULL_DOWN);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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