This is mainly based on a Renesas microcontroller Ultrasonic Ranging write a program, the 2014 race electrical reference routines, useful.

小蜜蜂超声波测距例程\小蜜蜂超声波测距例程\超声波测距\DefaultBuild\delay.rel
....................\....................\..........\............\r_cg_cgc.rel
....................\....................\..........\............\r_cg_cgc_user.rel
....................\....................\..........\............\r_cg_intc.rel
....................\....................\..........\............\r_cg_intc_user.rel
....................\....................\..........\............\r_cg_port.rel
....................\....................\..........\............\r_cg_port_user.rel
....................\....................\..........\............\r_cg_timer.rel
....................\....................\..........\............\r_cg_timer_user.rel
....................\....................\..........\............\r_main.rel
....................\....................\..........\............\r_systeminit.rel
....................\....................\..........\............\ultrasonic.rel
....................\....................\..........\............\超声波测距.hex
....................\....................\..........\............\超声波测距.lmf
....................\....................\..........\............\超声波测距.map
....................\....................\..........\............\超声波测距.sym
....................\....................\..........\delay.c
....................\....................\..........\delay.h
....................\....................\..........\r_cg_cgc.c
....................\....................\..........\r_cg_cgc.h
....................\....................\..........\r_cg_cgc_user.c
....................\....................\..........\r_cg_intc.c
....................\....................\..........\r_cg_intc.h
....................\....................\..........\r_cg_intc_user.c
....................\....................\..........\r_cg_macrodriver.h
....................\....................\..........\r_cg_port.c
....................\....................\..........\r_cg_port.h
....................\....................\..........\r_cg_port_user.c
....................\....................\..........\r_cg_timer.c
....................\....................\..........\r_cg_timer.h
....................\....................\..........\r_cg_timer_user.c
....................\....................\..........\r_cg_userdefine.h
....................\....................\..........\r_main.c
....................\....................\..........\r_systeminit.c
....................\....................\..........\ultrasonic.c
....................\....................\..........\ultrasonic.h
....................\....................\..........\代码说明.xls
....................\....................\..........\超声波测距.AE03.mtud
....................\....................\..........\超声波测距.lenovo.mtud
....................\....................\..........\超声波测距.mtpj
....................\....................\..........\超声波测距.oo.mtud
....................\....................\..........\DefaultBuild
....................\....................\超声波测距
....................\小蜜蜂超声波测距例程
小蜜蜂超声波测距例程

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