Re: PIN_FUNC_SELECT VS. gpio_output_set

2018-03-27T17:10:32+08:00

Maybe the document "ESP8266 Pin List" can help you. https://www.espressif.com/en/support/download/documents

Statistics: Posted by Her Mary — Tue Mar 27, 2018 5:10 pm

PIN_FUNC_SELECT VS. gpio_output_set

2018-03-14T09:44:04+08:00

Hi Everyone,
Quick simple question.

By default in the SDK are certain pins assigned with their correct PIN Function with output by default or is each pin unassigned and in order to use it as an Input or output you must call

PIN_FUNC_SELECT then call
gpio_output_set to say if the pin is used for Input or output.

I guess I'm looking for clarification of the technical defaults of the chip.

If I use PIN_FUNC_SELECT, Is a call for GPIO_OUTPUT_SET required to make the pin an output or is that default by PIN_FUNC_SELECT, I only need to call it to set it to be an input.

Why wouldn't I need to call PIN_FUNC_SELECT, are there any circumstances other then just having the pin nonused / floating?

The main reason why I am asking is that I have two projects side by side running the same code but for some reason the output is showing 1v on my Oscilloscope and on my other project, again running the same code is showing 3.3v on my Osciloscope for the GPIO output, I'm stumped.

Thanks for the clarification.
-Agent.

Code:

#include "ets_sys.h"
#include "osapi.h"
#include "gpio.h"
#include "os_type.h"
#include "ip_addr.h"
#include "mem.h"
#include "user_interface.h"
#include "lwip/stats.h"
#include "espconn.h"

#include "c_types.h"

#include "../library/uart.h"
#include "../library/gpio16.h"

#include "../library/common.h"
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

#define user_procTaskPrio        0
#define user_procTaskQueueLen    1
os_event_t user_procTaskQueue[user_procTaskQueueLen];

void ICACHE_FLASH_ATTR sdk_init_done_cb(void) 
{ 
   os_printf("[%s] initializing ESP8266!\r\n", __func__);
   gpio_output_set(0, 0, (1 << 15), 0); //Set GPIO as Output
   PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, FUNC_GPIO15);
   os_printf("on");
   gpio_output_set((1 << 15), 0, 0, 0);
   delay_5seconds();
   os_printf("off");
   gpio_output_set(0, (1 << 15), 0, 0);
}

void ICACHE_FLASH_ATTR user_init()
{
   //void   uart0_tx_buffer(uint8   *buf,   uint16   len)
   uart_div_modify(0, UART_CLK_FREQ / 115200);
   wifi_set_opmode(0);
   wifi_set_sleep_type( NONE_SLEEP_T );

   ETS_GPIO_INTR_DISABLE();// Disable gpio interrupts
   gpio_init();
   //Start os task
   system_init_done_cb(sdk_init_done_cb);
   //system_os_task(loop, user_procTaskPrio, user_procTaskQueue, user_procTaskQueueLen); //Task to Signal for later
}

Statistics: Posted by AgentSmithers — Wed Mar 14, 2018 9:44 am

ESP8266 Developer Zone

Re: PIN_FUNC_SELECT VS. gpio_output_set

PIN_FUNC_SELECT VS. gpio_output_set