Their implementation STM32 cortex-m3 in keil environment infrastructure projects, a complete git version control and clear code directory structure, to achieve the serial communication polling mode. You can use the code as a basis for engineering development projects.

STM32_Demo
..........\code
..........\....\.git
..........\....\....\COMMIT_EDITMSG
..........\....\....\config
..........\....\....\description
..........\....\....\FETCH_HEAD
..........\....\....\HEAD
..........\....\....\hooks
..........\....\....\.....\applypatch-msg.sample
..........\....\....\.....\commit-msg.sample
..........\....\....\.....\post-commit.sample
..........\....\....\.....\post-receive.sample
..........\....\....\.....\post-update.sample
..........\....\....\.....\pre-applypatch.sample
..........\....\....\.....\pre-commit.sample
..........\....\....\.....\pre-push.sample
..........\....\....\.....\pre-rebase.sample
..........\....\....\.....\prepare-commit-msg.sample
..........\....\....\.....\update.sample
..........\....\....\index
..........\....\....\info
..........\....\....\....\exclude
..........\....\....\logs
..........\....\....\....\HEAD
..........\....\....\....\refs
..........\....\....\....\....\heads
..........\....\....\....\....\.....\master
..........\....\....\objects
..........\....\....\.......\00
..........\....\....\.......\..\1cca410982ab6ee7924aeab55d26444249588e
..........\....\....\.......\02
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..........\....\....\.......\09
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..........\....\....\.......\..\bf85fed9f113c7e0e8d0c7c9d72c27337ea5c5
..........\....\....\.......\17
..........\....\....\.......\..\46e2cf0c5cee9aa6e0b193456e7048e849a5e3
..........\....\....\.......\..\97eb3ec954c696ef5201ad5f913652729fe26b
..........\....\....\.......\19
..........\....\....\.......\..\bdf5a8c9defbea5bde3443732c6fd517b9b008
..........\....\....\.......\1e
..........\....\....\.......\..\6a68acb43f28f5972450ec28a2d0c56f7a1c4e
..........\....\....\.......\21
..........\....\....\.......\..\4a5893a00815ebb1020d2b42a83b99a0b1a630
..........\....\....\.......\..\c46b26ec10e00410ad4c69a4f4c14a1c91d4e0
..........\....\....\.......\22
..........\....\....\.......\..\6f34ae5a385e0828a39fcbf3c33c4450da585c
..........\....\....\.......\..\cd972e331a574e8d2730b299ff35a40f1ce238
..........\....\....\

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