initial commit

1 files changed, 61 insertions, 0 deletions

diff --git a/src/gpio.c b/src/gpio.c
new file mode 100644
index 0000000..151779d
--- /dev/null
+++ b/src/gpio.c
@@ -0,0 +1,61 @@
+/**
+ * @file gpio.c
+ * Abstracts gpio access, makes things easier
+ *
+ * Copyright (C) 2018 Clyne Sullivan
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <gpio.h>
+
+void gpio_init(void)
+{
+	// enable clocks
+	RCC->AHB2ENR |= 0x0F;
+}
+
+void gpio_pupd(GPIO_TypeDef *port, uint32_t pin, uint32_t pupd)
+{
+	port->PUPDR &= ~(0x03 << (2 * pin));
+	port->PUPDR |= pupd << (2 * pin);
+}
+
+void gpio_speed(GPIO_TypeDef *port, uint32_t pin, uint32_t speed)
+{
+	port->OSPEEDR &= ~(0x03 << (2 * pin));
+	port->OSPEEDR |= speed << (2 * pin);
+}
+
+void gpio_type(GPIO_TypeDef *port, uint32_t pin, uint32_t type)
+{
+	port->OTYPER &= ~(1 << pin);
+	port->OTYPER |= type << pin;
+}
+
+void gpio_mode(GPIO_TypeDef *port, uint32_t pin, uint32_t mode)
+{
+	port->MODER &= ~(0x03 << (2 * pin));
+	port->MODER |= mode << (2 * pin);
+}
+
+void gpio_dout(GPIO_TypeDef *port, uint32_t pin, uint32_t val)
+{
+	port->BSRR |= (1 << (val ? pin : pin + 16));
+}
+
+uint32_t gpio_din(GPIO_TypeDef *port, uint32_t pin)
+{
+	return port->IDR & (1 << pin);
+}