[FAQ] TDA4VM: Using PDK GPIO driver

Toggling a GPIO PIN

To toggle a GPIO Pin using the GPIO driver, do the following steps:

1. PinMuxing

Make sure that the pin you are using is set in GPIO mode. You can use the following API from board library.

Board_pinmuxSetReg(SOC_DOMAIN, OFFSET, MODE);

2. Set the base address

Set the base address according the domain in which GPIO instance lies.

GPIO_socGetInitCfg(Port, &gpio_cfg);

gpio_cfg.baseAddr = CSL_xxxx_GPIO0_BASE;

GPIO_socSetInitCfg(Port, &gpio_cfg);

Where Port is GPIO instance in the given domain

3. GPIO Init

Do GPIO init. Before calling GPIO init, make sure the following structures are defined.

GPIO_PinConfig gpioPinConfigs[] =

{

    PIN | DIR,
    PIN | DIR,
….
….

};

Where PIN should be a hexadecimal value 0xABCD

Where AB represents Port number and CD represents the Pin number. For example, for configuring WKUP_GPIO0_16: PIN = 0x0010 and DIR = GPIO_CFG_OUTPUT or GPIO_CFG_INPUT

GPIO_CallbackFxn gpioCallbackFunctions[] =

{
    NULL,
    NULL

};

You can set the callback function using this structure, but for this use case we can keep it NULL 

GPIO_v0_Config{

    GPIO_PinConfig *pinConfigs;     /*! Pointer to the board's PinConfig array */

    GPIO_CallbackFxn *callbacks;     /*! Pointer to the board's callback array */

    uint32_t numberOfPinConfigs;     /*! Number of pin configs defined */

    uint32_t numberOfCallbacks;      /*! Number of callbacks defined */

    /*! Interrupt priority used for call back interrupts. Setting ~0 will

     * configure the lowest possible priority

     */

    uint32_t intPriority;

}

Call GPIO_init();

4. Call GPIO_write(PIN_INDEX, 0/1); to change the state of GPIO

Here PIN_INDEX is the index of  gpioPinConfigs structure for which you want to change the state.

Configuring GPIO interrupt

• Modify the GPIO_PinConfig structure to add the pin for which the interrupt needs to be triggered

• • Set the interrupt trigger - rising or falling or both edges. For example:
    • PIN1 | GPIO_CFG_IN_INT_RISING | GPIO_CFG_INPUT

• Before GPIO init do interrupt related configuration

gpio_cfg.baseAddr = CSL_xxxx_GPIO0_BASE;

intCfg = gpio_cfg.intCfg;

bankNum = PinNumber/16;

intCfg[PinNumber].intNum = IntRTR_OUTPUT_0 + bankNum;

intCfg[PinNumber].intcMuxNum = INVALID_INTC_MUX_NUM;

intCfg[PinNumber].intcMuxInEvent = 0;

intCfg[PinNumber].intcMuxOutEvent = 0;

• Call GPIO_init();
• Set the callback by calling GPIO_setCallback(PIN_Index, call back API)
• GPIO_enableInt(PIN_INDEX)

Where PIN_INDEX is the index of  gpioPinConfigs structure for which you want to change the state.