I spent hours trying to figure out why the program doesn t work. I checked voltages, looked on the Scope at the values but nothing worked.

Then I decided to use BDT to find out what is going on.

To do it I did the following:

I defined pins: PD4, PB1 and PC2 as GPIO, Input with 1M pullup.

I defined: bool state1, state2, state3;

void app_task(void){

 app_key_handler();

 localPermitJoinState();

 state1 = drv_gpio_read(GPIO_PD4);

 if(state1 == TRUE){

  led_on(LED_B);

 } else{

  led_off(LED_B);

 }

 state2 = drv_gpio_read(GPIO_PB1);

 if(state2 == FALSE){

  led_on(LED_G);

 }
else{

  led_off(LED_G);

 }

 state3 = drv_gpio_read(GPIO_PC2);

 if(state3 == FALSE){

  led_on(LED_R);

 }
else{

  led_off(LED_R);

 }

Because nothing was connected to the pins, from the above code I expected:

LED_B to be ON, LED_G to be OFF, LED_R to be OFF.

But all Leds were OFF!

I checked voltages and on all input pins the voltage was 3.1V

I short pin PD4 to ground - LED_B still OFF

I short pin PB1 to ground - LED_G turns ON

I short pin PC2 to ground - LED_R turns ON

So, LED_B never comes on.

I looked at the definition of drv_gpio_read() and return value should be boolean, but it doesn t work:

bool drv_gpio_read(u32 pin)
{

#if defined(MCU_CORE_826x) || defined(MCU_CORE_8258) || defined(MCU_CORE_8278)

  return gpio_read(pin);

#elif defined(MCU_CORE_B91)

  return gpio_get_level(pin);

#endif

}

But it only works if you use check the result like this:

 if(state3 == FALSE){

  led_on(LED_R);

 }
else{

  led_off(LED_R);

 }

If you try to check for result to be TRUE it doesn t work:

 if(state1 == TRUE){

  led_on(LED_B);

 } else{

  led_off(LED_B);

 }

I looked at the values in BDT and here are the results for state1, state2 and state3. They show that pins are high, so LED_B should be ON!

Looking in the types.h:

#ifndef TRUE

#define TRUE (!FALSE)

#endif

#ifndef bool

#define bool u8

In Telink BLE SDK in gcc\lib\tc-32-elf\... folder, stdbool.h has the following definition:

/*
* ISO C Standard: 7.16 Boolean type and values */
#ifndef _STDBOOL_H
#define _STDBOOL_H
#ifndef __cplusplus
#define bool _Bool
#define true 1
#define false 0

I think it should be fixed?

I decided to use gpio_read() function which returns unsigned int, so I know what to expect.