three ebooks in English on embedded system whether for junior or senior , they help a lot. They are 《Embedded system design》《Real_Time_Concepts_for_Embedded_Systems》《Embedded_Systems_building_blocks》

Embedded_Systems_Design_An_Introduction_To_Process.pdf
Real_Time_Concepts_for_Embedded_Systems.pdf
Embedded_Systems_building_blocks.pdf

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