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①.   First, choose not to use PLL. Let the external 24MHz raw clock pass directly and bypass the APLL path .global clock_init clock_init: ldr r0, =ELFIN_CLOCK_POWER_BASE // 1 set various clock switches and do not use PLL for the time being ldr r1, =0x0 // Chip manual P378 register CLK_SRC: Select clock source 0 (Main) str r1, [r0 ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it preface At present, I am playing the college students' embedded competition. My responsibility is to develop the Hi3861 development board. Because I used to play more STM32, the generated ...

Old routine; Introduction, pursue the source, and then talk about reality          When it comes to LEDs, everyone must be familiar. When playing the development board, we have lit patch LEDs of various colors, but when we need to use multiple LEDs at the same time, is the chip IO not enough? By the way, ...

![Please add a picture description] (https://img-blog.csdnimg.cn/65addb7917a34aa5bce4f707a4f71b35.webp?x-oss-process=image/watermark, type_ZHJvaWRzYW5zmFsbGJhY2s, shadow_50, text_Q1NETiBA6a2U5Yqo5bGx6Zy4, size_17, color_FFFFFF, t_70, g_Se, x_16) Preface Interrupt refers to the CPU being temporarily stopped by certain internal and externa ...