diff options
| author | Keith Packard <keithp@keithp.com> | 2013-04-28 23:06:24 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2013-04-28 23:06:24 -0700 |
| commit | 3b3cd04da359e7084b6b8b048dbdf0a902de47a2 (patch) | |
| tree | 3a2f5cd050c52ea93751c008df4cb0a9186e16ff | |
| parent | 1c091062696f541168b91fcfa18ed25519aa6fe5 (diff) | |
altos: Wait after configuring boot pin before testing it
Clearly the pin isn't quite ready just after it's been configured, so
hang around for a while (100 nops) to let things setting down before
testing the value of the pin. Makes booting a lot more reliable.
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src/stm/ao_boot_pin.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/stm/ao_boot_pin.c b/src/stm/ao_boot_pin.c index 03b0214f..1000a65a 100644 --- a/src/stm/ao_boot_pin.c +++ b/src/stm/ao_boot_pin.c @@ -31,6 +31,9 @@ ao_boot_check_pin(void) ao_enable_input(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN, AO_BOOT_APPLICATION_MODE); + for (v = 0; v < 100; v++) + ao_arch_nop(); + /* Read the value */ v = stm_gpio_get(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN); |