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main: move code pertaining to boot.py out of line

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.. this reduces stack usage in main() substantially, because
the 512 byte stack allocation will only exist during the new run_boot_py
function's duration.

Closes: #904
This commit is contained in:
Jeff Epler 2018-06-06 08:01:09 -05:00
parent aa636841a2
commit 654591e11f
1 changed files with 38 additions and 34 deletions
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72
main.c
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@ -233,40 +233,7 @@ bool start_mp(safe_mode_t safe_mode) {
}
}
int __attribute__((used)) main(void) {
// initialise the cpu and peripherals
safe_mode_t safe_mode = port_init();
rgb_led_status_init();
// Stack limit should be less than real stack size, so we have a chance
// to recover from limit hit. (Limit is measured in bytes.)
mp_stack_set_top((char*)&_estack);
mp_stack_set_limit((char*)&_estack - (char*)&_ebss - 1024);
#if MICROPY_MAX_STACK_USAGE
// _ezero (same as _ebss) is an int, so start 4 bytes above it.
mp_stack_set_bottom(&_ezero + 1);
mp_stack_fill_with_sentinel();
#endif
// Create a new filesystem only if we're not in a safe mode.
// A power brownout here could make it appear as if there's
// no SPI flash filesystem, and we might erase the existing one.
filesystem_init(safe_mode == NO_SAFE_MODE, false);
// Reset everything and prep MicroPython to run boot.py.
reset_port();
reset_board();
reset_mp();
// Turn on autoreload by default but before boot.py in case it wants to change it.
autoreload_enable();
// By default our internal flash is readonly to local python code and
// writable over USB. Set it here so that boot.py can change it.
filesystem_writable_by_python(false);
void run_boot_py(safe_mode_t safe_mode) {
// If not in safe mode, run boot before initing USB and capture output in a
// file.
if (filesystem_present() && safe_mode == NO_SAFE_MODE && MP_STATE_VM(vfs_mount_table) != NULL) {
@ -338,6 +305,43 @@ int __attribute__((used)) main(void) {
reset_port();
reset_mp();
}
}
int __attribute__((used)) main(void) {
// initialise the cpu and peripherals
safe_mode_t safe_mode = port_init();
rgb_led_status_init();
// Stack limit should be less than real stack size, so we have a chance
// to recover from limit hit. (Limit is measured in bytes.)
mp_stack_set_top((char*)&_estack);
mp_stack_set_limit((char*)&_estack - (char*)&_ebss - 1024);
#if MICROPY_MAX_STACK_USAGE
// _ezero (same as _ebss) is an int, so start 4 bytes above it.
mp_stack_set_bottom(&_ezero + 1);
mp_stack_fill_with_sentinel();
#endif
// Create a new filesystem only if we're not in a safe mode.
// A power brownout here could make it appear as if there's
// no SPI flash filesystem, and we might erase the existing one.
filesystem_init(safe_mode == NO_SAFE_MODE, false);
// Reset everything and prep MicroPython to run boot.py.
reset_port();
reset_board();
reset_mp();
// Turn on autoreload by default but before boot.py in case it wants to change it.
autoreload_enable();
// By default our internal flash is readonly to local python code and
// writable over USB. Set it here so that boot.py can change it.
filesystem_writable_by_python(false);
run_boot_py(safe_mode);
// Start serial and HID after giving boot.py a chance to tweak behavior.
serial_init();