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This commit creates a `common` directory, aimed to host drivers supported by multiple boards of the CC13xx/CC26xx family. We move the Sensortag SPI and External Flash drivers to this location and we change the Sensortag build system to pull the respective files from therein.
164 lines
5.3 KiB
C
164 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 common to the Sensortag and LaunchPad
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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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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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bool
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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 false;
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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 true;
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}
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/*---------------------------------------------------------------------------*/
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bool
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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 false;
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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 false;
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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 true;
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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, ti_lib_sys_ctrl_clock_get(),
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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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