Search found 58 matches

by YimingLi
Wed Jun 10, 2015 11:51 am
Forum: ESP8266 SDK
Topic: system_restart() hangs
Replies: 3
Views: 3356

Re: system_restart() hangs

Hi, It seems that your GPIO 0 is not in high level. While downloading bin files, it is MTDO: 0, GPIO 0 : 0, GPIO 2 : 1 While running program, it needs to be MTDO: 0, GPIO 0 : 1 , GPIO 2 : 1 Thanks for your interest in ESP8266 ! Add a little more. It seems that we should make sure a low level of GPI...
by YimingLi
Wed Jun 10, 2015 12:32 am
Forum: ESP8266 SDK
Topic: What is "Fatal exception (29)"?
Replies: 2
Views: 4278

Re: What is "Fatal exception (29)"?

Hi, The number in the parenthese, i.e. 29 in this example, should be "exception cause" number defined by Xtensa chip core. According to Xtensa datasheet, exception cause 29 is "Strore Prohibited Cause", a store referenced a page mapped with an attribute that does not permit store...
by YimingLi
Tue Jun 09, 2015 12:09 pm
Forum: ESP8266 HDK
Topic: 关于 GPIO 的状态保持
Replies: 2
Views: 3758

Re: 关于 GPIO 的状态保持

Hi, Please see below with ==> 我在使用ESP8266-12模块作为一个控制器。 使用GPIO14来输出控制信号。具体工作情况是,通常情况下 GPIO14输出 低电平,8266每隔一段时间从deep-sleep 中醒来,如果判断符合条件就输出高电平。否则继续输出低电平。 根据用户手册,为了满足从deep-sleep的苏醒条件,reset管脚链接到了 XPD_DCDC 管脚。 在试验中发现,模块能够进入deep-sleep, 也能够唤醒。 但是在唤醒时,GPIO14 管脚变成了高电平,然后进入用户 程序后才被再次置为低电平。这样模块的工作变成了每隔一段时间就输出一个高...
by YimingLi
Tue Jun 09, 2015 11:14 am
Forum: ESP8266 HDK
Topic: 又没有关于boot mode的说明
Replies: 5
Views: 6745

Re: 又没有关于boot mode的说明

Hi baosi, Please check this document 0D a little further, just below the MTDO/GPIO0/GPIO2 for boot_sel[2:0], to find that there is also a list of SDIO boot sel[2:0] by SD_D3/SD_D2/SD_D0, which give valus to the y here. Meanwhile, it should be easy for you to make experiemnts to confirmation your gue...
by YimingLi
Mon Jun 08, 2015 10:32 pm
Forum: ESP8266 HDK
Topic: 又没有关于boot mode的说明
Replies: 5
Views: 6745

Re: 又没有关于boot mode的说明

reset cause 1: normally during a Power-On-Reset or by CHIP_PD transient
reset cause 2: normally during a reset caused by a nRESET transient
reset cause 4: normally during a reset by wdt reset
by YimingLi
Mon Jun 08, 2015 10:14 pm
Forum: ESP8266 HDK
Topic: 又没有关于boot mode的说明
Replies: 5
Views: 6745

Re: 又没有关于boot mode的说明

Hi baosi,

You may please check the document 0D-ESP8266__Pin_List__Release_15-11-2014.xlsx http://bbs.espressif.com/download/file.php?id=442
by YimingLi
Mon Jun 08, 2015 10:11 pm
Forum: ESP8266 HDK
Topic: Excessive current on GPIO0 when driving to ground?
Replies: 3
Views: 5168

Re: Excessive current on GPIO0 when driving to ground?

Hi, GPIO0 is the boot_sel1, together with MTDO/boot_sel2 and GPIO2/boot_sel0 to form a boot mode selection array boot_sel[2:0], From the name you might figure out that the chip samples these pins upon bootup (excluding a reset by wdt) to select the boot mode -- as we know, if boot_sel[2:0]=b001, i.e...
by YimingLi
Mon Jun 08, 2015 9:21 pm
Forum: ESP8266 HDK
Topic: Connect GPIO16 to CHIP_PD for deep sleep mode?
Replies: 1
Views: 4668

Connect GPIO16 to CHIP_PD for deep sleep mode?

Dear Espressif, For the convenience of PCB layout (GPIO16 / PIN 8 close to CHIP_PD / PIN 7) , we wonder whether it is possible to connect GPIO16 to CHIP_PD, other than nRESET / PIN 32, to reset the chip upon exiting deep sleep mode. If we connect GPIO16 to nRESER pin, everything goes OK to exit the ...

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