path: root/avr/cmd_gpio.c

/*
 * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

#include "cmd_gpio.h"
#include "print-utils.h"
#include "getopt-min.h"
#include "env.h"
#include "gpio.h"
//#include "debug.h"


static uint_fast8_t pinnames_get(char *pin_names[GPIO_MAX+1])
{
	static const FLASH char delim1[] = {":= "};
	static const FLASH char delim2[] = {", "};
	uint_fast8_t width = 0;
	char *lp;
	uint_fast8_t i;

	memset(pin_names, 0, (GPIO_MAX+1) * sizeof(char *));

/* TODO: enters endless loop on wrong parameters */

	lp = getenv_str(PSTR(ENV_PINALIAS));
	if (lp != NULL) {
		pin_names[GPIO_MAX] = strdup(lp);
		if (pin_names[GPIO_MAX] != NULL) {
			char *ptr = strtok_P(pin_names[GPIO_MAX], delim1);
			while (ptr != NULL) {
				if (((i = strtoul(ptr, &lp, 10)) < GPIO_MAX) &&
						lp != ptr &&
						(ptr = strtok_P(NULL, delim2)) != NULL ) {
					pin_names[i] = ptr;
					ptr = strtok_P(NULL, delim1);
				}
			}

			for (i = 0; i < GPIO_MAX; i++)
				if (strlen(pin_names[i]) > width)
					width = strlen(pin_names[i]);
		}
	}
	return width;
}


static size_t xstrlen(char *s)
{
	if (s == NULL)
		return 0;
	else
		return strlen(s);
}

static const FLASH char * const FLASH pinconf_str[] = {
			FSTR("?"),
			FSTR("Input"),
			FSTR("Pullup"),
			FSTR("Output"),
			FSTR("Clock"),
		};

static const FLASH char * const FLASH pinlevel_str[] = {
			FSTR("Low"),
			FSTR("High"),
			FSTR(""),
		};

static void print_pin(uint8_t pin, uint_fast8_t multi, char *pin_names[], uint_fast8_t pn_width)
{
	gpiomode_t pinconf;
	const FLASH char *levelp;
	long div;

	pinconf = gpio_config_get(pin);
	if (pinconf == OUTPUT_TIMER) {
		div = gpio_clockdiv_get(pin);
		levelp = pinlevel_str[2];
	} else
		levelp = pinlevel_str[gpio_read(pin)];

	if (multi) {
		printf_P(PSTR("%3d "), pin);
		if (pn_width) {
			printf_P(PSTR("%s "), pin_names[pin]);
			print_blanks(pn_width - xstrlen(pin_names[pin]));
		}
		my_puts_P(pinconf_str[pinconf]);
		print_blanks(7 - strlen_P(pinconf_str[pinconf]));
		my_puts_P(levelp);
		print_blanks(5 - strlen_P(levelp));
		if (pinconf == OUTPUT_TIMER)
			printf_P(PSTR("%8ld  %8ld"),
				div, F_CPU/div);
	} else {
		printf_P(PSTR("%d: \"%s\", "), pin, pin_names[pin] ? pin_names[pin] : 0);
		my_puts_P(pinconf_str[pinconf]);
		my_puts_P(PSTR(", "));
		my_puts_P(levelp);

		if (pinconf == OUTPUT_TIMER)
			printf_P(PSTR("divide by %ld (%ldHz)"),
				div, F_CPU/div);
	}
	my_puts_P(PSTR("\n"));
}

static int_fast8_t pinarg_insert(uint8_t pin, uint_fast8_t count, uint_fast8_t pinarg[])
{
	uint_fast8_t pos;

	if (pin >= GPIO_MAX)
		return -1;

	for (pos = 0; pos < count; pos++) {
		if (pin == pinarg[pos])
			return 0;
		if (pin <  pinarg[pos])
			break;
	}
	for (uint_fast8_t i = count-1; i == pos ; i--)
		pinarg[i+1] = pinarg[i];
	pinarg[pos] = pin;

	return 1;
}

static uint_fast8_t pinarg_get(char * arg, uint_fast8_t pinarg[])
{
	char *endp;
	uint_fast8_t pin1;
	int_fast8_t rc;
	uint_fast8_t count = 0;

	while (1) {
		pin1 = strtoul(arg, &endp, 10);
		if (endp != arg && *endp == '-') {
			arg = endp+1;
			uint_fast8_t pin2 = (int) strtoul(arg, &endp, 10);
			if (pin1 < pin2)
				for (; pin1 < pin2; pin1++)
					if ((rc = pinarg_insert(pin1, count, pinarg)) >= 0)
						count += rc;
					else
						return 0;
			else
				return 0;
		}
		if (endp != arg) {
			if ((*endp == ',' || *endp == '\0') &&
					(rc = pinarg_insert(pin1, count, pinarg)) >= 0) {
				count += rc;
				if (*endp == '\0')
					return count;
			} else
					return 0;
		} else
			return 0;

		arg = endp+1;
	}
}


command_ret_t do_gpio(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char *const argv[])
{
	uint_fast8_t printheader = 1;
	uint_fast8_t pinarg[GPIO_MAX];
	uint_fast8_t pinargc;

	int opt;
	while ((opt = getopt(argc, argv, PSTR("s"))) != -1) {
		switch (opt) {
		case 's':
			printheader = 0;
			break;
		default: /* '?' */
			return CMD_RET_USAGE;
		}
	}

	/* remaining arguments */
	argc -= optind;

	if (argc == 0) {
		/* print config of all pins */
		for (pinargc = 0; pinargc < GPIO_MAX; pinargc++)
			pinarg[pinargc] = pinargc;
	} else {
		/* get first arg */
		pinargc = pinarg_get(argv[optind++], pinarg);
		if (pinargc == 0)
			return CMD_RET_USAGE;
		else
			argc--;
	}


	if (argc == 0) {
		/* no more args, print pin config */

		char *pin_names[GPIO_MAX + 1];
		uint_fast8_t pin_names_width = pinnames_get(pin_names);

		if (pinargc == 1)
			print_pin(pinarg[0], 0, pin_names, pin_names_width);
		else {
			if (printheader) {
				if (pin_names_width > 0) {
					if ( strlen("Name") > pin_names_width)
						pin_names_width = strlen("Name");
					char s[pin_names_width+1];
					memset(s, ' ', pin_names_width);
					s[pin_names_width] = '\0';
					strncpy_P(s, PSTR("Name"), 4);
					printf_P(PSTR("Pin %s Config Level Divider  Frequency/Hz\n"),s);
					memset(s, '-', pin_names_width);
					printf_P(PSTR("----%s-----------------------------------\n"), s);
				} else
					printf_P(PSTR("Pin Config Level Divider  Frequency/Hz\n"
						      "--------------------------------------\n"));
			}
			for (uint_fast8_t i = 0; i < pinargc; i++)
				print_pin(pinarg[i], 1, pin_names, pin_names_width);
		}
		if (pin_names[GPIO_MAX] != NULL)
			free(pin_names[GPIO_MAX]);
		return CMD_RET_SUCCESS;
	}

	/* arguments must be in pairs: pins conf */
	if (argc % 2 != 1)
		return CMD_RET_USAGE;

	while (argc > 0) {
		char *endp;
		gpiomode_t mode = NONE;
		int level = 0;
		unsigned long value = 0;
		uint8_t hz_flag = 0;

		switch (toupper(argv[optind][0])) {
		case 'H':
			level = 1;
			/* FALL TROUGH */
		case 'L':
			mode = OUTPUT;
			break;
		case 'P':
			mode = INPUT_PULLUP;
			break;
		case 'I':
		case 'T':
			mode = INPUT;
			break;

		default:
			value = strtoul(argv[optind], &endp, 10);
			switch (*endp) {
			case 'M':
				value *= 1000;
				/* FALL TROUGH */
			case 'K':
				value *= 1000;
				endp++;
			}

			if (*endp && strcmp_P(endp, PSTR("Hz")) == 0) {
				hz_flag = 1;
				endp += 2;
			}

			if (*endp != '\0') {
				printf_P(PSTR("invalid parameter: '%s'\n"), argv[optind]);
				return CMD_RET_USAGE;
			}

			if (value == 0) {
				printf_P(PSTR("invalid value: %lu \n"));
				return CMD_RET_USAGE;
			}

			if (hz_flag) {
				if (value > F_CPU / 2) {
					printf_P(PSTR("Max frequency is: %luHz\n"), F_CPU/2);
					return CMD_RET_USAGE;
				}
				value = F_CPU/value;
			}
			mode = OUTPUT_TIMER;

		}

		if (mode == NONE)
			return CMD_RET_USAGE;

		for (uint_fast8_t i = 0; i < pinargc; i++) {
			switch (mode) {
			case OUTPUT:
				gpio_write(pinarg[i], level);
				/* fall thru */
			case INPUT:
			case INPUT_PULLUP:
				gpio_config(pinarg[i], mode);
				break;
			case OUTPUT_TIMER:
				if (gpio_clockdiv_set(pinarg[i], value) < 0) {
					printf_P(PSTR("Setting pin %d to %lu failed.\n"),
								pinarg[i], value);
				}
				break;
			default:
				break;
			}
		}

		optind++;
		pinargc = pinarg_get(argv[optind++], pinarg);
		argc -= 2;
	}

	return CMD_RET_SUCCESS;
}