application: add basic monitor command

application.c

@@ -376,6 +376,98 @@ static void command_types(void* argument)
 	mux_select(-1); // disable multiplexer
 }
 
+/** monitor the channels for activity
+ *  @param[in] argument 0 to pull low, 1 to pull high
+ */
+static void command_monitor(void* argument)
+{
+	(void)argument; // we won't use the argument
+
+	// set input pull
+	if (NULL == argument) {
+		puts("channels are left floating\n");
+		for (uint8_t i = channel_start; i <= channel_stop; i++) {
+			gpio_mode_setup(channel_ports[i], GPIO_MODE_INPUT, GPIO_PUPD_NONE, channel_pins[i]); // set to floating
+		}
+	} else {
+		const uint32_t pull = *(uint32_t*)argument; // get pull argument
+		if (0 == pull) {
+			puts("channels are pulled low using internal 40 kOhm resistor\n");
+			for (uint8_t i = channel_start; i <= channel_stop; i++) {
+				gpio_mode_setup(channel_ports[i], GPIO_MODE_INPUT, GPIO_PUPD_PULLDOWN, channel_pins[i]); // set to pull down
+			}
+		} else if (1 == pull) {
+			puts("channels are pulled high to 3.3V using internal 40 kOhm resistor\n");
+			for (uint8_t i = channel_start; i <= channel_stop; i++) {
+				gpio_mode_setup(channel_ports[i], GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, channel_pins[i]); // set to pull up
+			}
+		} else {
+			puts("unknown pull parameter. use 0 for low and 3 for 3.3V high\n");
+			return;
+		}
+	}
+
+	// collect pins we want to monitor
+	uint16_t gpioa_mask = 0; // which pins on GPIOA we want to monitor
+	uint16_t gpiob_mask = 0; // which pins on GPIOB we want to monitor
+	for (uint8_t i = channel_start; i <= channel_stop; i++) {
+		if (GPIOA == channel_ports[i]) {
+			gpioa_mask |= channel_pins[i];
+		} else if (GPIOB == channel_ports[i]) {
+			gpiob_mask |= channel_pins[i];
+		} else {
+			printf("unknown port for CH%02u\n", i);
+		}
+	}
+
+	// get initial state
+	puts("press any key to stop monitoring\n");
+	puts("time (s) ");
+	for (uint8_t i = channel_start; i <= channel_stop; i++) {
+		printf("%02u ", i);
+	}
+	puts("\n");
+
+	// start monitoring
+	uint16_t gpioa_data = UINT16_MAX;
+	uint16_t gpiob_data = UINT16_MAX;
+	while (!user_input_available) { // run until user breaks it
+		// time to do periodic checks
+		if (wakeup_flag || second_flag) {
+			iwdg_reset(); // kick the dog
+			wakeup_flag = false; // clear flag
+			second_flag = false; // clear flag
+		}
+		// check is there is a change on a channel
+		const uint16_t gpioa_new = gpio_get(GPIOA, gpioa_mask);
+		const uint16_t gpiob_new = gpio_get(GPIOB, gpioa_mask);
+		if (gpioa_new != gpioa_data || gpiob_new != gpiob_data) {
+			// print data
+			puts("0000.000");
+			for (uint8_t i = channel_start; i <= channel_stop; i++) {
+				const uint16_t port = (GPIOA == channel_ports[i] ? gpioa_new : gpiob_new);
+				const uint8_t high = ((port & channel_pins[i]) ? 1 : 0);
+				if (high) {
+					puts("  1");
+				} else {
+					puts("  0");
+				}
+			}
+			puts("\n");
+			// save change
+			gpioa_data = gpioa_new;
+			gpiob_data = gpiob_new;
+			// do we need a rate limit?
+		}
+	}
+	user_input_get(); // clean input
+
+	// set all back to input
+	for (uint8_t i = channel_start; i <= channel_stop; i++) {
+		gpio_mode_setup(channel_ports[i], GPIO_MODE_INPUT, GPIO_PUPD_NONE, channel_pins[i]); // ensure pin is floating input
+	}
+}
+
 /** set first channel of range to scan
  *  @param[in] argument optional pointer to first channel number
  */
@@ -554,6 +646,14 @@ static const struct menu_command_t menu_commands[] = {
 		.argument_description = NULL,
 		.command_handler = &command_types,
 	},
+	{
+		.shortcut = 'm',
+		.name = "monitor",
+		.command_description = "monitor channel activity",
+		.argument = MENU_ARGUMENT_UNSIGNED,
+		.argument_description = "[0|3]",
+		.command_handler = &command_monitor,
+	},
 	{
 		.shortcut = 'c',
 		.name = "start",