diff options
Diffstat (limited to 'examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c')
| -rw-r--r-- | examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c | 280 |
1 files changed, 214 insertions, 66 deletions
diff --git a/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c b/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c index 925bd38..f062aef 100644 --- a/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c +++ b/examples/imx7_colibri_m4/driver_examples/gpio_imx/main.c @@ -34,99 +34,243 @@ #include "gpio_imx.h" #include "debug_console_imx.h" +#define GPIO_INTERRUPT (1) +#define GPIO_POLLING (0) +#define GPIO_DEBOUNCE_DELAY (100000) + /* button relevent variables */ -static volatile uint8_t keyPressCount; -static uint8_t keyLastState; -static uint8_t keyState; +static uint8_t keyPressCount; +static bool on = false; +#ifdef BOARD_GPIO_KEY_CONFIG +static volatile uint8_t button_pressed_flag; +#endif + +/*! + * @brief Initialize GPIO_LED controller. + */ +static void GPIO_Ctrl_InitLedPin(void) +{ +#ifdef BOARD_GPIO_LED_CONFIG + /* GPIO module initialize, configure "LED" as output and drive the output high level */ + gpio_init_config_t ledInitConfig = { + .pin = BOARD_GPIO_LED_CONFIG->pin, + .direction = gpioDigitalOutput, + .interruptMode = gpioNoIntmode + }; + GPIO_Init(BOARD_GPIO_LED_CONFIG->base, &ledInitConfig); +#endif +} + +/*! + * @brief Initialize GPIO INT\POLLING controller. + */ +static void GPIO_Ctrl_InitKeyPin(uint32_t gpioMode) +{ +#ifdef BOARD_GPIO_KEY_CONFIG + if (GPIO_INTERRUPT == gpioMode) + { + /* GPIO module initialize, configure button as interrupt mode. */ + gpio_init_config_t keyInitConfig = { + .pin = BOARD_GPIO_KEY_CONFIG->pin, + .direction = gpioDigitalInput, + .interruptMode = gpioIntFallingEdge, + }; + GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig); + /* Enable interrupt. */ + NVIC_EnableIRQ(BOARD_GPIO_KEY_IRQ_NUM); + } + else + { + /* GPIO module initialize, configure button as GPIO functionality. */ + gpio_init_config_t keyInitConfig = { + .pin = BOARD_GPIO_KEY_CONFIG->pin, + .direction = gpioDigitalInput, + .interruptMode = gpioNoIntmode, + }; + GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig); + } +#endif +} + +/*! + * @brief Wait user to press key in INT\NOINT mode. + */ +static void GPIO_WaitKeyPressed(uint32_t gpioMode) +{ +#ifdef BOARD_GPIO_KEY_CONFIG + uint32_t i, j, debounce; + + if (GPIO_INTERRUPT == gpioMode) + { + do + { + debounce = 0; + + /* Clear the interrupt state, this operation is necessary, because the GPIO module maybe confuse + the first rising edge as interrupt*/ + GPIO_ClearStatusFlag(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin); + /* Enable GPIO pin interrupt */ + GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, true); + + /* Waitting for Key pressed. */ + while(button_pressed_flag == 0); + button_pressed_flag = 0; + + for (i = 0; i < 3; i++) + { + /* Delay to wait key value stable. The cycle number should be changed + * according to M4 Core clock frequncy. + */ + for (j = 0 ; j < GPIO_DEBOUNCE_DELAY; j++) + { + __NOP(); + } + + if (0 == GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin)) + { + debounce++; + } + } + + if (debounce > 2) + { + break; + } + } while (1); + } + else + { + /* Wait for Key Released. */ + do + { + debounce = 0; + while (0 == GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin)); + + for (i = 0; i < 3; i++) + { + /* Delay to wait key value stable. The cycle number should be changed + * according to M4 Core clock frequncy. + */ + for (j = 0 ; j < GPIO_DEBOUNCE_DELAY; j++) + { + __NOP(); + } + + if (1 == GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin)) + { + debounce++; + } + } + + if (debounce > 2) + { + break; + } + } + while (1); + + /* Wait for Key Pressed. */ + do + { + debounce = 0; + while (1 == GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin)); + + for (i = 0; i < 3; i++) + { + /* Delay to wait key value stable. The cycle number should be changed + * according to M4 Core clock frequncy. + */ + for (j = 0 ; j < GPIO_DEBOUNCE_DELAY; j++) + { + __NOP(); + } + + if (0 == GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin)) + { + debounce++; + } + } + + if (debounce > 2) + { + break; + } + } + while (1); + } +#else + GETCHAR(); +#endif +} + +/*! + * @brief Toggle the led + */ +static void GPIO_LED_Toggle(void) +{ +#ifdef BOARD_GPIO_LED_CONFIG + GPIO_WritePinOutput(BOARD_GPIO_LED_CONFIG->base,BOARD_GPIO_LED_CONFIG->pin, on ? gpioPinSet : gpioPinClear); + keyPressCount++; + PRINTF("Button pressed %d times\n\r", keyPressCount); +#else + PRINTF("%c ", on ? '+' : '-'); +#endif + on = !on; +} /****************************************************************************** * * Function Name: main * Comments: GPIO module initialize, interrupt and IO operation. * This example include 2 step: -* 1)Configure BUTTON1 as interrupt mode, falling edge, and test +* 1)Configure BUTTON1 as interrupt mode, falling edge, and test * by pressing the button 3 times to trigger interrupt. * 2)Configure BUTTON1 as GPIO functionality * and check the button's state(pressed or released) through switch LED * to on or off if this board has LED. * ******************************************************************************/ -int main( void ) +int main(void) { /* hardware initialiize, include RDC, IOMUX, Uart debug initialize */ - hardware_init(); - + hardware_init(); PRINTF("\n\r====================== GPIO Example ========================\n\r"); -#ifdef BOARD_GPIO_LED_CONFIG - /* GPIO module initialize, configure "LED" as output and drive the output high level */ - gpio_init_t ledInitConfig = { - .pin = BOARD_GPIO_LED_CONFIG->pin, - .direction = gpioDigitalOutput, - .interruptMode = gpioNoIntmode - }; - GPIO_Init(BOARD_GPIO_LED_CONFIG->base, &ledInitConfig); - - /* drive the LED output high level. */ - GPIO_WritePinOutput(BOARD_GPIO_LED_CONFIG->base, BOARD_GPIO_LED_CONFIG->pin, gpioPinSet); -#endif + /* GPIO module initialize, configure "LED" as output and button as interrupt mode. */ + GPIO_Ctrl_InitLedPin(); + GPIO_Ctrl_InitKeyPin(GPIO_INTERRUPT); + /* wait for user to press button */ #ifdef BOARD_GPIO_KEY_CONFIG - /* GPIO module initialize, configure button as interrupt mode. */ - gpio_init_t keyInitConfig = { - .pin = BOARD_GPIO_KEY_CONFIG->pin, - .direction = gpioDigitalInput, - .interruptMode = gpioIntFallingEdge - }; - GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig); - - NVIC_EnableIRQ(BOARD_GPIO_KEY_IRQ_NUM); - /* Clear the interrupt state, this operation is necessary, because the GPIO module maybe confuse - the first rising edge as interrupt*/ - GPIO_ClearStatusFlag(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin); - /* Enable GPIO pin interrupt */ - GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, true); - /* press button trigger interrupt */ PRINTF("\n\r=================== GPIO Interrupt =====================\n\r"); - PRINTF("The (%s) button is configured to trigger GPIO interrupt.\n\r", BOARD_GPIO_KEY_CONFIG->name); + PRINTF("The (%s) button is configured to trigger GPIO interrupt\n\r", BOARD_GPIO_KEY_CONFIG->name); PRINTF("Press the (%s) button 3 times to continue.\n\n\r", BOARD_GPIO_KEY_CONFIG->name); +#else + PRINTF("\n\r============ Use key to simulate GPIO button ==============\n\r"); + PRINTF("Input any data from terminal 3 times to continues.\n\n\r"); +#endif + keyPressCount = 0; + while(keyPressCount < 3) + { + GPIO_WaitKeyPressed(GPIO_INTERRUPT); + keyPressCount++; + PRINTF("Button pressed %d time. \n\r", keyPressCount); + } - keyPressCount = 1; - while(keyPressCount < 4); - - /* Now disable the interrupt */ - NVIC_DisableIRQ(BOARD_GPIO_KEY_IRQ_NUM); - GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, false); - - /* GPIO module initialize, configure button as GPIO functionality. */ - keyInitConfig.pin = BOARD_GPIO_KEY_CONFIG->pin; - keyInitConfig.direction = gpioDigitalInput; - keyInitConfig.interruptMode = gpioNoIntmode; - GPIO_Init(BOARD_GPIO_KEY_CONFIG->base, &keyInitConfig); + GPIO_Ctrl_InitKeyPin(GPIO_POLLING); + keyPressCount = 0; /* Configure button as GPIO functionality and check the button's state(pressed or released) to switch LED on or off */ - /* Check the buttion's status(pressed or released) */ PRINTF("\n\r================= GPIO Functionality==================\n\r"); - PRINTF("The (%s) button state is now polled.\n\r", BOARD_GPIO_KEY_CONFIG->name); - PRINTF("Press the (%s) button to switch LED on or off\n\n\r", BOARD_GPIO_KEY_CONFIG->name); - - keyLastState = 1; //initial button released, logic 1 - - for(;;) + PRINTF("The button state is now polled.\n\r"); + PRINTF("Press the button to switch LED on or off\n\n\r"); + while(true) { - keyState = GPIO_ReadPinInput(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin); - if(keyState != keyLastState) - { - PRINTF("Button %s\n\r", keyState ? "pressed" : "released"); - keyLastState = keyState; -#ifdef BOARD_GPIO_LED_CONFIG - GPIO_WritePinOutput(BOARD_GPIO_LED_CONFIG->base, BOARD_GPIO_LED_CONFIG->pin, keyState ? gpioPinSet : gpioPinClear); -#endif - } + GPIO_WaitKeyPressed(GPIO_POLLING); + GPIO_LED_Toggle(); } -#endif } /****************************************************************************** @@ -134,13 +278,17 @@ int main( void ) * Comments: The interrupt service routine triggered by gpio * Note: Need to consider how to eliminate the button shake problem ******************************************************************************/ +#ifdef BOARD_GPIO_KEY_CONFIG void BOARD_GPIO_KEY_HANDLER(void) { - PRINTF("Button pressed %d time. \n\r", keyPressCount); - keyPressCount++; + button_pressed_flag = 1; /* clear the interrupt status */ GPIO_ClearStatusFlag(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin); + + /* Disable GPIO pin interrupt */ + GPIO_SetPinIntMode(BOARD_GPIO_KEY_CONFIG->base, BOARD_GPIO_KEY_CONFIG->pin, false); } +#endif /******************************************************************************* * EOF |