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| author | Freddie Chopin <freddie_chopin@op.pl> | 2010-11-13 15:42:00 +0100 |
|---|---|---|
| committer | Øyvind Harboe <oyvind.harboe@zylin.com> | 2010-11-15 09:17:14 +0100 |
| commit | 015bf559444edd9e7c524e951aad183fdaab9156 (patch) | |
| tree | f62886adff78bb89a803bca99c300703029a9641 /src | |
| parent | 6287c23b326cdebf20283b5c4eb8da4fae3eb821 (diff) | |
| download | openocd+libswd-015bf559444edd9e7c524e951aad183fdaab9156.tar.gz openocd+libswd-015bf559444edd9e7c524e951aad183fdaab9156.tar.bz2 openocd+libswd-015bf559444edd9e7c524e951aad183fdaab9156.tar.xz openocd+libswd-015bf559444edd9e7c524e951aad183fdaab9156.zip | |
Add comments and tiny improvements to STM32 flash loader algorithm
Add comments to assembly flash loader for STM32. Add tiny improvement in
size of the algorithm (40 vs 48 bytes) and tiny speed improvement (~1.5%,
as time is wasted on waiting for end of operation anyway).
Signed-off-by: Freddie Chopin <freddie_chopin@op.pl>
Diffstat (limited to 'src')
| -rw-r--r-- | src/flash/nor/stm32x.c | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/src/flash/nor/stm32x.c b/src/flash/nor/stm32x.c index 6b46afc8..7779ea3a 100644 --- a/src/flash/nor/stm32x.c +++ b/src/flash/nor/stm32x.c @@ -503,25 +503,26 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer, /* see contib/loaders/flash/stm32x.s for src */ static const uint8_t stm32x_flash_write_code[] = { + /* #define STM32_FLASH_CR_OFFSET 0x10 */ + /* #define STM32_FLASH_SR_OFFSET 0x0C */ /* write: */ - 0xDF, 0xF8, 0x24, 0x40, /* ldr r4, STM32_FLASH_CR */ - 0x09, 0x4D, /* ldr r5, STM32_FLASH_SR */ - 0x4F, 0xF0, 0x01, 0x03, /* mov r3, #1 */ - 0x23, 0x60, /* str r3, [r4, #0] */ - 0x30, 0xF8, 0x02, 0x3B, /* ldrh r3, [r0], #2 */ - 0x21, 0xF8, 0x02, 0x3B, /* strh r3, [r1], #2 */ + 0xdf, 0xf8, 0x20, 0x40, /* ldr r4, STM32_FLASH_BASE */ + /* write_half_word: */ + 0x01, 0x23, /* movs r3, #0x01 */ + 0x23, 0x61, /* str r3, [r4, #STM32_FLASH_CR_OFFSET] */ + 0x30, 0xf8, 0x02, 0x3b, /* ldrh r3, [r0], #0x02 */ + 0x21, 0xf8, 0x02, 0x3b, /* strh r3, [r1], #0x02 */ /* busy: */ - 0x2B, 0x68, /* ldr r3, [r5, #0] */ - 0x13, 0xF0, 0x01, 0x0F, /* tst r3, #0x01 */ - 0xFB, 0xD0, /* beq busy */ - 0x13, 0xF0, 0x14, 0x0F, /* tst r3, #0x14 */ - 0x01, 0xD1, /* bne exit */ - 0x01, 0x3A, /* subs r2, r2, #1 */ - 0xED, 0xD1, /* bne write */ + 0xe3, 0x68, /* ldr r3, [r4, #STM32_FLASH_SR_OFFSET] */ + 0x13, 0xf0, 0x01, 0x0f, /* tst r3, #0x01 */ + 0xfb, 0xd0, /* beq busy */ + 0x13, 0xf0, 0x14, 0x0f, /* tst r3, #0x14 */ + 0x01, 0xd1, /* bne exit */ + 0x01, 0x3a, /* subs r2, r2, #0x01 */ + 0xf0, 0xd1, /* bne write_half_word */ /* exit: */ - 0x00, 0xBE, /* bkpt #0 */ - 0x10, 0x20, 0x02, 0x40, /* STM32_FLASH_CR: .word 0x40022010 */ - 0x0C, 0x20, 0x02, 0x40 /* STM32_FLASH_SR: .word 0x4002200C */ + 0x00, 0xbe, /* bkpt #0x00 */ + 0x00, 0x20, 0x02, 0x40, /* STM32_FLASH_BASE: .word 0x40022000 */ }; /* flash write code */ |