From: Keith Packard <keithp@keithp.com>
Date: Tue, 28 Aug 2012 05:45:47 +0000 (-0700)
Subject: altos: Enable STM SYSCFG when routing EXTI
X-Git-Tag: 1.1~65
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=68df2b1173e82d48f7857ad2e9325e6a9cbbedfd

altos: Enable STM SYSCFG when routing EXTI

The EXTI routing information is in the syscfg unit, so that needs to
be powered up or writes to its registers will be lost.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/src/stm/stm32l.h b/src/stm/stm32l.h
index 3a498a0a..25f5af07 100644
--- a/src/stm/stm32l.h
+++ b/src/stm/stm32l.h
@@ -905,6 +905,9 @@ stm_exticr_set(struct stm_gpio *gpio, int pin) {
 	uint8_t	shift = (pin & 3) << 2;
 	uint8_t	val = 0;
 
+	/* Enable SYSCFG */
+	stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGEN);
+
 	if (gpio == &stm_gpioa)
 		val = STM_SYSCFG_EXTICR_PA;
 	else if (gpio == &stm_gpiob)