diff options
| author | Keith Packard <keithp@keithp.com> | 2009-04-21 02:07:08 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2009-04-21 02:07:08 -0700 |
| commit | 1b333def5052d2ed47fdeaef23a897fe326f6340 (patch) | |
| tree | aea48be9fa977fb98e8211b6871b44f27db26ee8 | |
| parent | d1887ded41a5bfec8e10e9fd736fa9444b9b6222 (diff) | |
Add longer debug delays to reset/debug_mode entry
| -rw-r--r-- | ao_dbg.c | 37 |
1 files changed, 31 insertions, 6 deletions
@@ -29,10 +29,16 @@ static void ao_dbg_send_bits(uint8_t msk, uint8_t val) { P0 = (P0 & ~msk) | (val & msk); + _asm + nop + nop + nop + nop + nop + nop + _endasm; } -#define ao_dbg_pause() do { _asm nop; nop; nop _endasm; } while (0); - void ao_dbg_send_byte(uint8_t byte) { @@ -46,9 +52,7 @@ ao_dbg_send_byte(uint8_t byte) d = DBG_DATA; byte <<= 1; ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, DBG_CLOCK|d); - ao_dbg_pause(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, 0 |d); - ao_dbg_pause(); } P0DIR &= ~DBG_DATA; } @@ -62,11 +66,9 @@ ao_dbg_recv_byte(void) for (b = 0; b < 8; b++) { byte = byte << 1; ao_dbg_send_bits(DBG_CLOCK, DBG_CLOCK); - ao_dbg_pause(); if (DBG_DATA_PIN) byte |= 1; ao_dbg_send_bits(DBG_CLOCK, 0); - ao_dbg_pause(); } return byte; } @@ -189,28 +191,51 @@ ao_dbg_set_pins(void) P0DIR = DBG_RESET_N | DBG_CLOCK; } +static void +ao_dbg_long_delay(void) +{ + uint8_t n; + + for (n = 0; n < 20; n++) + _asm nop _endasm; +} + void ao_dbg_debug_mode(void) { ao_dbg_set_pins(); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA|DBG_RESET_N); + ao_dbg_long_delay(); } void ao_dbg_reset(void) { ao_dbg_set_pins(); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 ); + ao_dbg_long_delay(); ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N); + ao_dbg_long_delay(); } static void |