--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief STM32 GPIO control interface.
+ *
+ * \author Andrea Righi <arighi@develer.com>
+ */
+
+#include <cfg/compiler.h>
+#include <cfg/debug.h>
+#include <io/stm32.h>
+#include "gpio_stm32.h"
+
+/**
+ * Configure a GPIO pin
+ *
+ * \param base Base address of the GPIO port
+ * \param pins Bit-packed representation of the pin(s)
+ * \param mode Pin(s) configuration mode
+ * \param speed Output drive speed
+ *
+ * Return 0 on success, otherwise a negative value.
+ */
+int stm32_gpioPinConfig(struct stm32_gpio *base,
+ uint16_t pins, uint8_t mode, uint8_t speed)
+{
+ uint32_t reg_mode = mode & 0x0f;
+ int i;
+
+ if (mode & 0x10)
+ reg_mode |= speed;
+
+ if (pins & 0xff)
+ {
+ uint32_t reg = base->CRL;
+
+ for (i = 0; i < 8; i++)
+ {
+ uint32_t pos = 1 << i;
+
+ if (pins & pos)
+ {
+ pos = i << 2;
+ reg &= ~(0x0f << pos);
+ reg |= reg_mode << pos;
+
+ if (mode == GPIO_MODE_IPD)
+ base->BRR = 0x01 << i;
+ if (mode == GPIO_MODE_IPU)
+ base->BSRR = 0x01 << i;
+ }
+ }
+ base->CRL = reg;
+ }
+ if (pins > 0xff)
+ {
+ uint32_t reg = base->CRH;
+
+ for (i = 0; i < 8; i++)
+ {
+ uint32_t pos = 1 << (i + 8);
+
+ if (pins & pos)
+ {
+ pos = i << 2;
+ reg &= ~(0x0f << pos);
+ reg |= reg_mode << pos;
+
+ if (mode == GPIO_MODE_IPD)
+ base->BRR = 0x01 << (i + 8);
+ if (mode == GPIO_MODE_IPU)
+ base->BSRR = 0x01 << (i + 8);
+ }
+ }
+ base->CRH = reg;
+ }
+ return 0;
+}
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief STM32 GPIO control interface.
+ */
+
+#ifndef GPIO_STM32_H
+#define GPIO_STM32_H
+
+#include <io/stm32.h>
+
+/* GPIO configuration registers structure */
+struct stm32_gpio
+{
+ reg32_t CRL;
+ reg32_t CRH;
+ reg32_t IDR;
+ reg32_t ODR;
+ reg32_t BSRR;
+ reg32_t BRR;
+ reg32_t LCKR;
+};
+
+/**
+ * GPIO mode
+ */
+/*\{*/
+enum
+{
+ GPIO_MODE_AIN = 0x0,
+ GPIO_MODE_IN_FLOATING = 0x04,
+ GPIO_MODE_IPD = 0x28,
+ GPIO_MODE_IPU = 0x48,
+ GPIO_MODE_OUT_OD = 0x14,
+ GPIO_MODE_OUT_PP = 0x10,
+ GPIO_MODE_AF_OD = 0x1C,
+ GPIO_MODE_AF_PP = 0x18,
+};
+/*\}*/
+
+/**
+ * GPIO speed
+ */
+/*\{*/
+enum
+{
+ GPIO_SPEED_10MHZ = 1,
+ GPIO_SPEED_2MHZ,
+ GPIO_SPEED_50MHZ,
+};
+/*\}*/
+
+/* Write a value to the specified pin(s) */
+INLINE void
+stm32_gpioPinWrite(struct stm32_gpio *base, uint32_t pins, uint8_t val)
+{
+ if (val)
+ base->BSRR |= pins;
+ else
+ base->BRR |= pins;
+}
+
+/* Read a value from the specified pin(s) */
+INLINE uint8_t stm32_gpioPinRead(struct stm32_gpio *base, uint32_t pins)
+{
+ return !!(base->IDR & pins);
+}
+
+/* Initialize a GPIO peripheral configuration */
+int stm32_gpioPinConfig(struct stm32_gpio *base,
+ uint16_t pins, uint8_t mode, uint8_t speed);
+
+#endif /* GPIO_STM32_H */
projects / bertos.git / commitdiff