176 lines
3.7 KiB
C
176 lines
3.7 KiB
C
/* Tool to control ZX76-31R5-SP-S+ digital attenuators on LTHW Main unit */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include "gpio.h"
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/* GPIO pin assignment */
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#define GPIO_LE_1 13
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#define GPIO_LE_2 7
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#define GPIO_LE_3 5
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#define GPIO_LE_4 11
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#define GPIO_DATA 15
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#define GPIO_CLK 17
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/* Internal GPIO alias */
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#define LE_1 0
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#define LE_2 1
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#define LE_3 2
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#define LE_4 3
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#define DATA 4
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#define CLK 5
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/* ZX76-31R5-SP-S+ properties */
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#define DB_MAX 31.5
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/* Generate a clock or latch enable pulse */
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static inline void gpio_pulse(struct gpio_descr *gd, unsigned int gpio)
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{
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gpio_set(gd, gpio, 1);
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gpio_set(gd, gpio, 0);
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}
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/* Write control word to Attenuator */
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void att_write(struct gpio_descr *gd, uint8_t cw, unsigned int le)
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{
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int i;
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unsigned int bit;
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/* Write control word (val) to Attenuator */
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for (i = 5; i >= 0; i--) {
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bit = ((cw >> i) & 1);
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gpio_set(gd, DATA, bit);
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gpio_pulse(gd, CLK);
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}
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/* Generate latch enable pulse */
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gpio_pulse(gd, le);
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}
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/* Initalize attenuators */
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struct gpio_descr *att_init(void)
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{
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unsigned int gpios[6];
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struct gpio_descr *gd;
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/* GPIO pin mapping */
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gpios[LE_1] = GPIO_LE_1;
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gpios[LE_2] = GPIO_LE_2;
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gpios[LE_3] = GPIO_LE_3;
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gpios[LE_4] = GPIO_LE_4;
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gpios[DATA] = GPIO_DATA;
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gpios[CLK] = GPIO_CLK;
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/* Open GPIO */
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gd = gpio_open(NULL, gpios, 6);
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if (!gd) {
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printf("Error: Unable to open GPIO\n");
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exit(1);
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}
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/* Initalize GPIOs to low level */
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gpio_set(gd, LE_1, 0);
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gpio_set(gd, LE_2, 0);
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gpio_set(gd, LE_3, 0);
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gpio_set(gd, LE_4, 0);
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gpio_set(gd, DATA, 0);
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gpio_set(gd, CLK, 0);
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return gd;
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}
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/* Set attenuator value */
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void att_set(struct gpio_descr *gd, double val, unsigned int le)
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{
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uint8_t cw;
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if (val > DB_MAX || val < 0) {
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printf("Error: Invalid attenuation value!\n");
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return;
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}
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printf("Setting attenuator #%d to value %.1lf...\n", le + 1, val);
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cw = (uint8_t) (val * 2);
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att_write(gd, cw, le);
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}
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/* Print online help */
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void print_help(char *progname)
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{
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printf("Usage: %s -i ID -a ATT\n", progname);
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printf("Attenuation (ATT) in 0.5db steps, range 0-31.5\n");
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printf("\n");
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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struct gpio_descr *gd;
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int option;
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double getopt_att = -1;
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int getopt_id = -1;
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/* Parse options */
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while ((option = getopt(argc, argv, "hi:a:")) != -1) {
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switch (option) {
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case 'h':
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print_help(basename(argv[0]));
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break;
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case 'a':
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getopt_att = atof(optarg);
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break;
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case 'i':
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getopt_id = atoi(optarg) - 1;
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break;
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}
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}
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/* Check options */
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if (getopt_att < 0) {
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printf("Error: No attenuation value specified!\n");
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exit(1);
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}
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if (getopt_id < 0) {
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printf("Error: No attenuator id specified!\n");
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exit(1);
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}
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if (getopt_id > 3) {
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printf("Error: Invalid attenuator id specified!\n");
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exit(1);
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}
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/* Set attenuation */
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gd = att_init();
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att_set(gd, getopt_att, getopt_id);
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gpio_close(gd);
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return 0;
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}
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