I personally tested the PCF8591 program, upload the entire project to ensure that the program is available.

C51_PCF8591_LCD5110\5110.c
...................\5110.h
...................\5110.LST
...................\5110.OBJ
...................\5110.__i
...................\AD数据测试
...................\AD数据测试.hex
...................\AD数据测试.lnp
...................\AD数据测试.M51
...................\AD数据测试.plg
...................\AD数据测试.uvopt
...................\AD数据测试.uvproj
...................\AD数据测试_uvopt.bak
...................\AD数据测试_uvproj.bak
...................\delay.c
...................\delay.h
...................\delay.LST
...................\delay.OBJ
...................\delay.__i
...................\display.c
...................\display.h
...................\display.LST
...................\display.OBJ
...................\display.__i
...................\i2c.c
...................\i2c.h
...................\i2c.LST
...................\i2c.OBJ
...................\i2c.__i
...................\main.c
...................\main.LST
...................\main.OBJ
...................\main.__i
...................\STARTUP.A51
...................\STARTUP.LST
...................\STARTUP.OBJ
C51_PCF8591_LCD5110

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