< div class = "字段field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above”> < div class = "字段标签" >论坛:,< / div > < div class = "字段条目" > < div class =”field-item甚至“rel = " sioc: has_container " > < a href = " /论坛/ dialog-smartbond-bluetooth-low-energy - % E2 % 80% 93 -软件”“=“sioc:容器sioc:论坛”属性= " rdfs: label skos: prefLabel”数据类型= " " >对话框Smartbond蓝牙低能量-软件< / > < / div > < / div > < / div > < div class =”字段field-name-body field-type-text-with-summary field-label-hidden”> < div class = "字段条目" > < div class =”field-item甚至“财产=“内容:编码”> < p >你好,< / p > < p >我在新的对话框中,我使用DA14695,USB DK学习样例代码(SDK版本:10.0.8.105,WIRA 10.440.8.6)。 我尝试使用SPI模块，用LA记录SPI波形，发现CS引脚花的时间太长。
My SPI speed is 4MHz, CLK timing about 0.25us / bit, but it took nearly 90us for CS to go from low to hi…< / p > < p > < / p > < p >时间图:< / p > < p > CS销低 ---------- 我们等待40 ---------- 9-bit数据(总3 ) ---------- 我们等待40 ---------- CS销高< / p > < p > < / p > < p >有办法缩短加快SPI CS销时间?< / p > < p >谢谢! !
void spi_send_DATA(uint8_t dat) {#if 1 //SPI 9位模式ad_spi_activate_cs(SpiHandle);ad_spi_write_9th_bit (SpiHandle 0 x01);spi_send_8b (dat);/ / ad_spi_deactivate_cs_when_spi_done (SpiHandle);ad_spi_deactivate_cs (SpiHandle); #endif }