Search found 138 matches

by costaud
Thu May 18, 2017 2:59 pm
Forum: ESP8266 SDK
Topic: 想请问有关HSPI的几个问题
Replies: 3
Views: 609

Re: 想请问有关HSPI的几个问题

spi 的clock是多少频率?
by costaud
Fri Apr 07, 2017 10:10 am
Forum: ESP8266 SDK
Topic: [已解决]关于ESP8266 Download Tool烧写功能的疑问
Replies: 6
Views: 846

Re: 关于ESP8266 Download Tool烧写功能的疑问

If you are using python, you can refer to this tool:

https://github.com/espressif/esptool

run: python esptool.py -h to check the help info.
by costaud
Thu May 05, 2016 5:12 pm
Forum: ESP8266 SDK
Topic: 请教: ESP8266 (GPIO15)红外载波信号PWM生成
Replies: 3
Views: 1516

Re: 请教: ESP8266 (GPIO15)红外载波信号PWM生成

我需要生成红外载波信号,频率从32KHz到56KHz不等。 我测试了两种方法:Delta-Sigma和I2S 如果使用“delta sigma”,duty cycle太小了,为了增加距离,我需要更高的duty cycle,例如35%或者50%。 如果使用"I2S"模式,GPIO2可以达到我的要求,可是,GPIO12默认是pull-up(高电平),而在我们的系统中,高电平是发射红外,所以GPIO2不能用。 GPIO15,看似不错,可是,频率最低40.3KHz,不能达到我的要求。 可不可以修改I2S的前端clock divider? 我不介意用80MHz的CPU频率来运行系统...
by costaud
Tue Mar 15, 2016 10:44 am
Forum: General Q&A
Topic: 8266启动异常
Replies: 3
Views: 1355

Re: 8266启动异常

HI 乐鑫: 我们的8266板子在上电的时候不能下载程序,也不能执行FLASH中的程序(FLASH中的程序是在开发板上下载好的),打印如下(逻辑分析仪抓取): est Jan 8 2013,res cause:2, boot mode:(5,6) waiting for host 相关脚管的电平状态如下: MTDO:0 GPIO0:0 GPIO2:1 SD_DATA0: 0 SD_DATA2: 0 SD_DATA3:0 我们用的是两线的FLASH连接方式 请问这是什么原因? THS 上电状态错误:boot mode:(5,6) , 下载模式是mode(1,x),FLASH运行是mode(3,...
by costaud
Mon Dec 07, 2015 7:49 pm
Forum: ESP8266 SDK
Topic: UART cause esp8266 reboot
Replies: 4
Views: 1649

Re: UART cause esp8266 reboot

Hi, when i try send esp8266 uart as much as possible datas, it caused the reboot. :( it show " ets Jan 8 2013,rst cause:2, boot mode:(6,6) \r\n waiting for host" (foget the boot mode first 6) the UART is set enable RTS/CTS. and the RTS also rise and fall. the test client stop send data wh...
by costaud
Mon Oct 26, 2015 3:57 pm
Forum: ESP8266 SDK
Topic: uart_div_modify failed!
Replies: 4
Views: 1582

Re: uart_div_modify failed!

Hi I'm found a interest thing. the PC baudrate set to 230400. the ESP8266 baudrate set to 354461. the ESP8266 will receive right datas. 230400/354461 = 0.65. it seem the CPU freq in call_user_start() is 80Mhz * 0.65 = 52Mhz. Could some tell me what's going on? :? Hello, How do you write the boot lo...
by costaud
Wed Sep 16, 2015 2:20 pm
Forum: ESP8266 SDK
Topic: System stops after wdt reset
Replies: 3
Views: 2903

Re: System stops after wdt reset

Sometimes the system stops after a wdt reset e.g. output: mac 662 ets Jan 8 2013,rst cause:4, boot mode:(1,6) wdt reset then nothing until reset button pressed. Any ideas please or is this an SDK bug? Ok,I think the point is : If a watchdog reset occurs, the chip would exactly go back to the same m...
by costaud
Tue Jul 28, 2015 4:19 pm
Forum: ESP8266 SDK
Topic: ESP8266 communication with ds3231 RTC on i2c
Replies: 2
Views: 2045

Re: ESP8266 communication with ds3231 RTC on i2c

Hi , can you capture the waveform of IIC bus?
Make sure there is an external pull-up resister or set a pull-up register inside.
by costaud
Tue Jul 07, 2015 5:44 pm
Forum: ESP8266 SDK
Topic: Should data type UartBautRate not be UartBaudRate?
Replies: 4
Views: 1432

Re: Should data type UartBautRate not be UartBaudRate?

Howdy ... its one thing having typos in the docs. They can easily be fixed.... however, this post was about what appears to be a typo being present in the actual SDK code that is meant to be consumed by users. For example, as of right now, if I want to create a variable that can be passed into &quo...
by costaud
Tue Jul 07, 2015 5:35 pm
Forum: ESP8266 SDK
Topic: confused with the value of system_adc_read
Replies: 1
Views: 1291

Re: confused with the value of system_adc_read

I'm using a 3.3v VDD to power up 8266, and expect system_adc_read() returns 0~1023 mapped to 0~1v as the document says, and it works perfectly until I write esp_init_default.bin to the flash . before flash esp_init_default.bin, the content of 0x1FC000 was filled with 0xff, and all the things worked...

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