Interface Programming Information And Examples; Gpio Programming Example - Cypress WICED CYW920706WCDEVAL Hardware User's Manual

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10 Interface Programming Information and Examples

Note: All code and code references in this section pertain to WICED Studio. Source C files may be found under the

appropriate application folder in the Project Explorer window under 20706-A2_Bluetooth\apps, and header H files which

contain definitions for the #define's used in the example code may be found under 20706-A2_Bluetooth\include. See

detailed information on using WICED Studio to build and run the sample applications mentioned in the subsections below,

including viewing application trace message output generated from WICED_BT_TRACE().statements shown in the example

code.

Consider the following information after physically assigning GPIO_Pxx to digital I/O pins:



When CYW20706 is in the Low Power or Deep Sleep modes, no data can be received from any of its interfaces (SPI,

PUART, etc.). To wake CYW20706, use a GPIO_Pxx configured as an interrupt. Refer to wiced_hal_gpio.h and

gpiodriver.h for the pertinent API functions and constants. See

about the sleep modes and power-save options.

To access GPIO driver services invoke the wiced_hal_gpio_init function during application initialization. This is



independent of other functions and must be called before any other GPIO functions.



For a sample application that pertains to GPIO API function usage refer to the hal_gpio_app.c file in WICED Studio.



For information on the API functions that support SPI1 configuration, control, and data exchange, refer to

wiced_hal_pspi.h. To generate chip-select (CS) signals to attached slaves, refer to wiced_hal_gpio.h.



For information on the API functions that pertain to PUART access, refer to wiced_hal_puart.h.



The remaining paragraphs in this section provide the following programming examples:



GPIO Programming Example



SPI1 Master Programming Example



SPI1 Slave Programming Example



BSC Programming Example



PUART Programming Example



NVRAM Programming Example

10.1 GPIO Programming Example

The example in this section demonstrates some aspects of GPIO programming, including GPIO driver initialization, configuring

GPIOs for input and output, and registering interrupt handlers. Refer to wiced_hal_gpio.h for the complete set of API functions

that support GPIO programming. See the hal_gpio_app sample application in WICED Studio under 20706-

A2_Bluetooth\apps\snip\hal_gpio for a complete working program using these APIs.

To initialize the GPIO driver, invoke the wiced_hal_gpio_init function. The GPIO driver should be one of the first to be

initialized.

The following example code is similar to the code found in hal_gpio_app.c.

APPLICATION_START( )

{

wiced_set_debug_uart( WICED_ROUTE_DEBUG_TO_PUART);

wiced_hal_puart_select_uart_pads( WICED_PUART_RXD, WICED_PUART_TXD, 0, 0);

WICED_BT_TRACE( "GPIO application start\n\r" );

wiced_bt_stack_init( sample_gpio_app_management_cback,NULL,NULL);

}

wiced_result_t sample_gpio_app_management_cback( wiced_bt_management_evt_t event,

{

wiced_result_t result = WICED_SUCCESS;

CYW920706WCDEVAL Hardware User Guide

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Appendix A "Power-Save

PRELIMIN ARY

wiced_bt_management_evt_data_t *p_event_data)

Doc. No.: 002-16535 Rev. **

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Interface Programming Information And Examples; Gpio Programming Example - Cypress WICED CYW920706WCDEVAL Hardware User's Manual

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GPIO Programming Example

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