From e2ea2a7d57b9a204c08488118aa054b56a1e43fe Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Sun, 22 May 2011 22:29:00 +0200 Subject: digital/avr/modules/devices/usdist: new US sensor module --- digital/avr/modules/devices/usdist/usdist.c | 122 ++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 digital/avr/modules/devices/usdist/usdist.c (limited to 'digital/avr/modules/devices/usdist/usdist.c') diff --git a/digital/avr/modules/devices/usdist/usdist.c b/digital/avr/modules/devices/usdist/usdist.c new file mode 100644 index 00000000..75c7899b --- /dev/null +++ b/digital/avr/modules/devices/usdist/usdist.c @@ -0,0 +1,122 @@ +/* usdist.c */ +/* io - Input & Output with Artificial Intelligence (ai) support on AVR. {{{ + * + * Copyright (C) 2010 Nicolas Schodet + * + * APBTeam: + * Web: http://apbteam.org/ + * Email: team AT apbteam DOT org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * }}} */ +#include "common.h" +#include "usdist.h" + +#include "modules/adc/adc.h" +#include "modules/utils/utils.h" +#include "io.h" + +/* This include is to be defined by user program. */ +#include "simu.host.h" + +uint16_t usdist_mm[AC_USDIST_NB]; + +/** Describe a sensor. */ +struct usdist_sensor_t +{ + /** ADC number. */ + uint8_t adc; + /** Sync PORT. */ + volatile uint8_t *sync_port; + /** Sync DDR. */ + volatile uint8_t *sync_ddr; + /** Sync bit mask. */ + uint8_t sync_bv; +}; + +/** Define sensors configuration. */ +#define USDIST_SENSOR(adc, p, n) \ + { adc, &IO_PORT_ (p, n), &IO_DDR_ (p, n), IO_BV_ (p, n) }, +struct usdist_sensor_t usdist_sensors[AC_USDIST_NB] = { + AC_USDIST_SENSORS +}; + +void +usdist_init (void) +{ + uint8_t i; + adc_init (); + for (i = 0; i < AC_USDIST_NB; i++) + { + usdist_mm[i] = 0xffff; + *usdist_sensors[i].sync_port &= ~usdist_sensors[i].sync_bv; + *usdist_sensors[i].sync_ddr |= usdist_sensors[i].sync_bv; + } +} + +uint8_t +usdist_update (void) +{ + /* Current measuring sensor. */ + static uint8_t current; + /* Number of cycles until the measure ends. */ + static uint8_t wait; + /* Set to one once first cycle is done. */ + static uint8_t init; + /* Time to measure? */ + if (wait == 0) + { + if (init) + { + /* Stop sensor. */ + *usdist_sensors[current].sync_port &= + ~usdist_sensors[current].sync_bv; + /* Read ADC value. */ + adc_start (usdist_sensors[current].adc); + while (!adc_checkf ()) + ; + uint16_t v = adc_read (); + /* Our sensors return a value between 1 and 5 V proportional to + * the distance between calibrated values. Ignore faulty sensors. */ + if (v <= 1024 / 5 / 4) + usdist_mm[current] = 0xffff; + else if (v <= 1024 / 5) + usdist_mm[current] = USDIST_MM_MIN; + else + usdist_mm[current] = USDIST_MM_MIN + + ((uint32_t) (v - 1024 / 5) + * (USDIST_MM_MAX - USDIST_MM_MIN) + / (4 * 1024 / 5)); + if (usdist_mm[current] >= USDIST_MM_TOO_FAR) + usdist_mm[current] = 0xffff; + /* Next. */ + current = (current + 1) % AC_USDIST_NB; + } + init = 1; + /* Prepare next measure. */ + *usdist_sensors[current].sync_port |= + usdist_sensors[current].sync_bv; + wait = AC_USDIST_PERIOD; + /* New mesure done. */ + return 1; + } + else + { + wait--; + return 0; + } +} + -- cgit v1.2.3