bstanwell/wch-uf2-example
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2024-04-23 16:12:54 +01:00
parent d5ae69f21a
commit 02c30ff61a
4 changed files with 110 additions and 8 deletions
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startup.S
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@@ -22,6 +22,8 @@ _start:
// Weird things seem to happen if you fall off the end of flash
la a0, _bootloader_limit
lw a0, (a0)
// Note that flash *doesn't* erase to 0xffffffff but instead this value
// (yes, this is technically mentioned in the reference manual)
la a1, 0xe339e339
beq a0, a1, _enter_bootloader
@@ -62,7 +64,7 @@ _start:
sw a1, (STK_CMPLR-SYSTICK_BASE)(a0)
la a1, 0b111000
sw a1, (STK_CTLR-SYSTICK_BASE)(a0)
// Seems to spuriously fire immediately if start bit is set concurrently
// Seems to spuriously fire immediately if start bit is set concurrently?
la a1, 0b111001
sw a1, (STK_CTLR-SYSTICK_BASE)(a0)
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