A simple question about generating us delay

Hello Dialog,
I'd like to use adc at around 500~1k Hz sampling rate, which requires ~1us level time delay. The code snippet is kind of:

adc_init(GP_ADC_SE, 0, GP_ADC_ATTN3X);
adc_enable_channel(ADC_CHANNEL_P01);
for-loop:
int data = adc_get_sample();
排队(数据);
delay(1us);

Previously I use the software timer app_easy_timer but I found the minimum delay of the easy timer is 10ms which is too large. When I search for timer0 I found they are mainly for PWM, audio, etc. My question is 1) How can I generate ~1us delay? If using timer0, are there any code snippets? 2) Does timer0 work during extended sleep mode? Thanks!