从机拉高data线后,延迟40us左右(28~70us之间)主机再次读取data线电平,如果为低电平,则为“0”,如果为高电平,则为“1”。 继续重复上述1,2步骤累计40次。 ESP-01S WIFI模块 简介 ESP8266 系列模组是深圳市安信可科技有限公司开发的一系列基于乐鑫ESP8266的低功耗UART-WiFi芯片模组,可以方便地进行二次开发,接入...
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没添加文件是这个错../main/motor.c:41:21: error: implicit declaration of function 'ets_delay_us' [-Werror=implicit-function-declaration] ets_delay_us(DELAY_us); 我添加头文件也报错,../main/motor.c:4:10: fatal error: rom/ets_sys.h: No such file or directory #include "rom/ets_sys....
I want to wait a specific time in the wake stub of the ESP32 and I use: ets_delay_us(200*1000); for a 200ms delay. Unfortunately I measure 68ms delay. The function "ets_get_cpu_frequency()" returns 13 in the wake stub, which seems to be wrong? I could not find any informatio...
For short delays, you can use esp_rom_delay_us(). A context switch on the ESP takes about 10-15us, so that's the lower bound of what's achievable for a task by waiting for a notification from a (timer) ISR; if you can accept the jitter, I'd say you should go for blocking ...
esp_err_t ret=-1; spi_transaction_t trasactionHandle; memset(&trasactionHandle,0,sizeof(trasactionHandle)); ret=spi_bus_initialize(SENDER_HOST,&buscfg, SPI_DMA_CH_AUTO); assert(ret==ESP_OK); ret=spi_bus_add_device(SENDER_HOST,&devcfg,&Devicehandle); ...
long long int Timer8 = esp_timer_get_time(); printf("Timer: %lld μs\n", Timer8); float diff4 = Timer8 - Timer7; printf("Difference: %f ms\n", diff4/1000); } As you can see in the output, increasing the delay gives us a more accurate result as compared to smaller delay ...
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单纯延时1us这个delay_us好像做不到了，要重新写个函数。void delay_us1(){ u32 temp;SysTick->...
问ESP32 Tasks vTaskDelay:需要执行一次循环，但得到了多次执行EN用$(document).on('click','#XX',...