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16f859dafd
This makes life easier when calling e.g. `saul_reg_write()` with data stored in flash. As now the signatures for reading and writing differ (in that `const` qualifier only), `saul_notsup()` is split into `saul_write_notsup()` and `saul_read_notsup()`. However, one is implemented as a symbol alias of the other, so that ROM consumption remains unchanged.
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* Copyright (C) 2018 Gunar Schorcht
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_pcf857x
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* @brief PCF857X adaption to the RIOT actuator/sensor interface
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* @author Gunar Schorcht <gunar@schorcht.net>
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* @file
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*/
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#if MODULE_SAUL_GPIO
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#include <string.h>
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#include "saul.h"
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#include "pcf857x.h"
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extern pcf857x_t pcf857x_devs[];
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static int read(const void *dev, phydat_t *res)
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{
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const pcf857x_saul_gpio_params_t *p = (const pcf857x_saul_gpio_params_t *)dev;
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int inverted = (p->gpio.flags & SAUL_GPIO_INVERTED);
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res->val[0] = (pcf857x_gpio_read(&pcf857x_devs[p->dev],
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p->gpio.pin)) ? !inverted : inverted;
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res->unit = UNIT_BOOL;
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res->scale = 0;
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return 1;
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}
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static int write(const void *dev, const phydat_t *state)
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{
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const pcf857x_saul_gpio_params_t *p = (const pcf857x_saul_gpio_params_t *)dev;
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int inverted = (p->gpio.flags & SAUL_GPIO_INVERTED);
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int value = (state->val[0] ? !inverted : inverted);
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pcf857x_gpio_write(&pcf857x_devs[p->dev], p->gpio.pin, value);
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return 1;
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}
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const saul_driver_t pcf857x_gpio_out_saul_driver = {
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.read = read,
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.write = write,
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.type = SAUL_ACT_SWITCH
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};
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const saul_driver_t pcf857x_gpio_in_saul_driver = {
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.read = read,
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.write = saul_write_notsup,
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.type = SAUL_SENSE_BTN
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};
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#endif /* MODULE_SAUL_GPIO */
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