diff options
| author | Keith Packard <keithp@keithp.com> | 2013-04-28 23:06:24 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2013-05-07 21:30:27 -0700 |
| commit | ecb128579e7576fc27c8ca93708f316b9ac91630 (patch) | |
| tree | c87f4058197004107f3b308e59b62b3ccc30e16e | |
| parent | 4a90eec4b8ee4a35711aa74c13b3f30d12c0fe08 (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); |