想请问有关HSPI的几个问题

f4568525153
Posts: 7
Joined: Mon May 15, 2017 8:51 am

想请问有关HSPI的几个问题

Postby f4568525153 » Mon May 15, 2017 11:01 am

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
Posts: 1615
Joined: Mon Oct 27, 2014 11:08 am

Re: 想请问有关HSPI的几个问题

Postby ESP_Faye » Tue May 16, 2017 10:48 am

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
Posts: 7
Joined: Mon May 15, 2017 8:51 am

Re: 想请问有关HSPI的几个问题

Postby f4568525153 » Wed May 17, 2017 6:16 pm

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
Posts: 138
Joined: Fri Oct 24, 2014 7:40 pm

Re: 想请问有关HSPI的几个问题

Postby costaud » Thu May 18, 2017 2:59 pm

spi 的clock是多少频率?

ddze7374
Posts: 9
Joined: Tue Dec 06, 2016 4:09 pm

Re: 想请问有关HSPI的几个问题

Postby ddze7374 » Sat Sep 23, 2017 6:39 pm

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
Posts: 50
Joined: Sun May 03, 2015 5:36 pm

Re: 想请问有关HSPI的几个问题

Postby YimingLi » Thu Oct 05, 2017 10:47 pm

ddze7374 wrote: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.

Who is online

Users browsing this forum: No registered users and 11 guests