From ecb128579e7576fc27c8ca93708f316b9ac91630 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sun, 28 Apr 2013 23:06:24 -0700 Subject: [PATCH 1/1] 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 --- src/stm/ao_boot_pin.c | 3 +++ 1 file changed, 3 insertions(+) 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); -- 2.30.2