想请问有关HSPI的几个问题

[f4568525153]

我想问几个有关HSPI的问题
1. CLK、MOSI 手册说明是空闲低电平，能改成空闲高电平吗?
2. CS下拉与CLK之间的间可以设定吗?
谢谢

[ESP_Faye]

您好，

1. 可以。
2. 请问具体是想设置成多久？

感谢您对 ESP8266 的关注！

[f4568525153]

感谢回复

1.那请问该如何设定?我把脚位设成HSPI马上就变成低准位了

2.CS比CLK提早50uS

[costaud]

spi 的clock是多少频率？

[ddze7374]

SPI frequency is limited by the maximum frequency of the Master device. In case of the software controlled SPI on the ESP8266 , it is 80 MHz.

[YimingLi]

SPI frequency is limited by the maximum frequency of the Master device. In case of the software controlled SPI on the ESP8266 , it is 80 MHz.

ESP8266 HSPI做从设备时，实际可靠的SPI频率只能到20MHz。超过20MHz后，固件需要做特殊的处理，才可以达到40MHz。
As a slave, ESP8266 HSPI can reach only 20MHz for a reliable communication. Special handling on firmwares will be required from both master and slave sides to achieve a reliable spi communication upto 40MHz.