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/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_boot.h>
#include <ao_exti.h>
void
ao_boot_check_pin(void)
{
uint16_t v;
/* Enable power interface clock */
stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_PWREN);
/* Enable the input pin */
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);
/* Reset the chip to turn off the port and the power interface clock */
ao_gpio_set_mode(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN, 0);
ao_disable_port(&AO_BOOT_APPLICATION_GPIO);
stm_rcc.apb1enr &= ~(1 << STM_RCC_APB1ENR_PWREN);
if (v == AO_BOOT_APPLICATION_VALUE)
ao_boot_chain(AO_BOOT_APPLICATION_BASE);
}
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