Summary

• Collect these just for hobby. I’m not sure if all the units can work fine on any platform. Waiting for your advice!

Unit list

covert hex char(s) into a number.

• code: 01_hexchars2num

swap byte(s) which can be used to swap values and convert endians.

• code: 02_bytes_swap

CRC calculation

• code: 03_crc

print ascii table use C.

• code: 04_ascii

queue using array

• code: 05_array_queue

Test if an ASCII char is a number.

• code: 06_is_digit

Find a number in a string.

• code: 07_skip_atoi

Calculate a variable size and round it to int units.

• code: 08___va_rounded_szie

Map a number in a range to a new number in another range.

• code: 09_map

hamming weight calculation

• code: 10_hamming_weight

hysteresis control, also called bang-bang control

• code: 11_hysteresis_process
• A test note: hysteresis_control

printf

• a tiny and fast printf which is suitable for embedded system.
• related link: printf
• 1306_两个开源printf的资源使用对比测试

average calculation

• a test note: 1280_C语言求两个无符号整形的平均值

set bits

• a fuction which can support a u32 variable bits set and clear. It can be very easily modified for other data types.
• code: 13_set_bits

MD5 calculation

• MD5 Message-Digest Algorithm (RFC 1321)
• code: 14_md5

couting bits

• hacker_popcnt
• code: 15_hacker_popcnt

free and malloc for embedded system.

• code: 16_memmang
• note: 1883_把FreeRTOS中的heap_4作为一个通用模块使用并初步测试