Java program using interrupt and 32-bit timer

Call your state machine every 500000 us.

Continuously blink SOS in Morse code on the green and red LEDs.

If a button is pushed, toggle the message between SOS and OK. Pushing the button in the

middle of a message should NOT change the message until it is complete. For example, if you push the button while the 'O' in SOS is being blinked out, the message will not change to OK until after the SOS message is completed. Remember in a previous module your work with UART included an example of how to turn an LED on or off (as opposed to toggle).

The following guide will help provide a base for the functionality you are creating:

Dot = red LED on for 500ms

Dash = green LED on for 1500ms

3*500ms between characters (both LEDs off)

7*500ms between words (both LEDs off), for example SOS 3500ms SOS

if a button is pushed at any time during a message, the new message will not start until the end of the 7*500ms gap between messages. The following example assumes the button is pushed during the first SOS and during the last 3500ms.

SOS 3500ms OK 3500ms OK 3500ms OK 3500ms SOS

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/* * ======== gpiointerrupt.c ======== */ #include #include #include

/* Driver Header files */ #include

/* Driver configuration */ #include "ti_drivers_config.h"

/* * ======== gpioButtonFxn0 ======== * Callback function for the GPIO interrupt on CONFIG_GPIO_BUTTON_0. * * Note: GPIO interrupts are cleared prior to invoking callbacks. */ void gpioButtonFxn0(uint_least8_t index) { /* Toggle an LED */ GPIO_toggle(CONFIG_GPIO_LED_0); }

/* * ======== gpioButtonFxn1 ======== * Callback function for the GPIO interrupt on CONFIG_GPIO_BUTTON_1. * This may not be used for all boards. * * Note: GPIO interrupts are cleared prior to invoking callbacks. */ void gpioButtonFxn1(uint_least8_t index) { /* Toggle an LED */ GPIO_toggle(CONFIG_GPIO_LED_1); }

/* * ======== mainThread ======== */ void *mainThread(void *arg0) { /* Call driver init functions */ GPIO_init();

/* Configure the LED and button pins */ GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW); GPIO_setConfig(CONFIG_GPIO_LED_1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW); GPIO_setConfig(CONFIG_GPIO_BUTTON_0, GPIO_CFG_IN_PU | GPIO_CFG_IN_INT_FALLING);

/* Turn on user LED */ GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);

/* Install Button callback */ GPIO_setCallback(CONFIG_GPIO_BUTTON_0, gpioButtonFxn0);

/* Enable interrupts */ GPIO_enableInt(CONFIG_GPIO_BUTTON_0);

/* * If more than one input pin is available for your device, interrupts * will be enabled on CONFIG_GPIO_BUTTON1. */ if (CONFIG_GPIO_BUTTON_0 != CONFIG_GPIO_BUTTON_1) { /* Configure BUTTON1 pin */ GPIO_setConfig(CONFIG_GPIO_BUTTON_1, GPIO_CFG_IN_PU | GPIO_CFG_IN_INT_FALLING);

/* Install Button callback */ GPIO_setCallback(CONFIG_GPIO_BUTTON_1, gpioButtonFxn1); GPIO_enableInt(CONFIG_GPIO_BUTTON_1); }

return (NULL); }

void timerCallback(Timer_Handle myHandle, int_fast16_t status) {} void initTimer(void) { Timer_Handle timer0; Timer_Params params; Timer_init(); Timer_Params_init(¶ms); params.period = 500; params.periodUnits = Timer_PERIOD_US; params.timerMode = Timer_CONTINUOUS_CALLBACK; params.timerCallback = timerCallback; timer0 = Timer_open(CONFIG_TIMER_0, ¶ms); if (timer0 == NULL) { /* Failed to initialized timer */ while (1) {} } if (Timer_start(timer0) == Timer_STATUS_ERROR) { /* Failed to start timer */ while (1) {} } }

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