spi 的clock是多少频率？

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.

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...

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,...

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...

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...

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...

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.

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...

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...