X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstm32f1%2Fao_boot_pin.c;fp=src%2Fstm32f1%2Fao_boot_pin.c;h=e1c21c873c03831b682cfabf79cfe477be37fb0b;hb=4e9dbae68893181165b2c3a3f111b12cb86c7eb6;hp=0000000000000000000000000000000000000000;hpb=c4cc908d642ea1c52c07b80106b5463e22f3c888;p=fw%2Faltos

diff --git a/src/stm32f1/ao_boot_pin.c b/src/stm32f1/ao_boot_pin.c
new file mode 100644
index 00000000..e1c21c87
--- /dev/null
+++ b/src/stm32f1/ao_boot_pin.c
@@ -0,0 +1,47 @@
+/*
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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>
+
+int
+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 = ao_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 &= ~(1UL << STM_RCC_APB1ENR_PWREN);
+	return v == AO_BOOT_APPLICATION_VALUE;
+}