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USB Improvements

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* Introduce shell module for basic serial shell with argument parsing
* Introduce shell_cmd_list module for basic compile-time command
  registration
* Harden USB handling to hang less and drop fewer inputs
  - Service tud_task() with periodic TC0 timer interrupt
  - Service cdc_task() with periodic TC1 timer interrupt
  - Handle shell servicing in main app loop
  - Add a circular buffering layer for reads/writes
* Change newline prints to also send carriage return
* Refactor filesystem commands for shell subsystem
* Introduce new shell commands:
  - 'help' command
  - 'flash' command to reset into bootloader
  - 'stress' command to stress CDC writes

Testing:
* Shell validated on Sensor Watch Blue w/ Linux host
* Shell validated in emscripten emulator
* Tuned by spamming inputs during `stress` cmd until stack didn't crash
This commit is contained in:
Edward Shin
2023-10-15 00:36:49 -04:00
parent 63d6bc6aa0
commit 5b762d0168
15 changed files with 820 additions and 160 deletions
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6
watch-library/shared/watch/watch.h
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@@ -88,6 +88,10 @@ bool watch_is_usb_enabled(void);
*/
void watch_reset_to_bootloader(void);
/** @brief Call periodically from app main loop to service CDC RX/TX.
*/
void cdc_task(void);
/** @brief Reads up to len bytes from the USB serial.
* @param file ignored, you can pass in 0
* @param ptr pointer to a buffer of at least len bytes
@@ -96,4 +100,4 @@ void watch_reset_to_bootloader(void);
*/
int read(int file, char *ptr, int len);
#endif /* WATCH_H_ */
#endif /* WATCH_H_ */

19
watch-library/shared/watch/watch_private.h
View File

@@ -38,14 +38,19 @@ void _watch_enable_tcc(void);
/// Called by buzzer and LED teardown functions. You should not call this from your app.
void _watch_disable_tcc(void);
/// Enable USB task timer. Called by USB enable routine in main(). You should not call this from your app.
void _watch_enable_tc0(void);
/// Disable USB task timer. You should not call this from your app.
void _watch_disable_tc0(void);
/// Enable CDC task timer. Called by USB enable routine in main(). You should not call this from your app.
void _watch_enable_tc1(void);
/// Disable CDC task timer. You should not call this from your app.
void _watch_disable_tc1(void);
/// Called by main.c if plugged in to USB. You should not call this from your app.
void _watch_enable_usb(void);
// this function ends up getting called by printf to log stuff to the USB console.
int _write(int file, char *ptr, int len);
// i thought this would be called by gets but it doesn't? anyway it does get called by read()
// so that's our mechanism for reading data from the USB serial console.
int _read(int file, char *ptr, int len);
#endif