/* * This file is part of the libopencm3 project. * * Copyright (C) 2012 chrysn * * 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 . */ /** @file * @see EFM32TG_GPIO */ /** Definitions for the GPIO subsystem (General Purpose Input Output). * * This corresponds to the description in d0034_efm32tg_reference_manual.pdf * section 28. * * @defgroup EFM32TG_GPIO EFM32 Tiny Gecko GPIO * @{ */ #ifndef LIBOPENCM3_EFM32_TINYGECKO_GPIO_H #define LIBOPENCM3_EFM32_TINYGECKO_GPIO_H #include #include /** Register definitions and register value definitions for the GPIO subsystem * * @defgroup EFM32TG_GPIO_regsandvals EFM32 Tiny Gecko GPIO registers and values * @{ */ /** These definitions reflect d0034_efm32tg_reference_manual.pdf section 28.4 * * The bulk of the registers defined here (like GPIO_PA_CTRL) will not be used * inside the convenience functions, but are provided for direct access. * * @todo This section could profit from bit-banding. * * @defgroup EFM32TG_GPIO_registers EFM32 Tiny Gecko GPIO registers * @{ */ #define GPIO_Px_CTRL(port) MMIO32(port + 0x000) /**< @see EFM32TG_GPIO_Px_CTRL_bits */ #define GPIO_Px_MODEL(port) MMIO32(port + 0x004) /**< @see EFM32TG_GPIO_MODE_values */ #define GPIO_Px_MODEH(port) MMIO32(port + 0x008) /**< @see EFM32TG_GPIO_MODE_values */ #define GPIO_Px_DOUT(port) MMIO32(port + 0x00C) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_Px_DOUTSET(port) MMIO32(port + 0x010) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_Px_DOUTCLR(port) MMIO32(port + 0x014) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_Px_DOUTTGL(port) MMIO32(port + 0x018) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_Px_DIN(port) MMIO32(port + 0x01C) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_Px_PINLOCKN(port) MMIO32(port + 0x020) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_PA (GPIO_BASE + 0x000) #define GPIO_PA_CTRL GPIO_Px_CTRL(GPIO_PA) #define GPIO_PA_MODEL GPIO_Px_MODEL(GPIO_PA) #define GPIO_PA_MODEH GPIO_Px_MODEH(GPIO_PA) #define GPIO_PA_DOUT GPIO_Px_DOUT(GPIO_PA) #define GPIO_PA_DOUTSET GPIO_Px_DOUTSET(GPIO_PA) #define GPIO_PA_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PA) #define GPIO_PA_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PA) #define GPIO_PA_DIN GPIO_Px_DIN(GPIO_PA) #define GPIO_PA_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PA) #define GPIO_PB (GPIO_BASE + 0x024) #define GPIO_PB_CTRL GPIO_Px_CTRL(GPIO_PB) #define GPIO_PB_MODEL GPIO_Px_MODEL(GPIO_PB) #define GPIO_PB_MODEH GPIO_Px_MODEH(GPIO_PB) #define GPIO_PB_DOUT GPIO_Px_DOUT(GPIO_PB) #define GPIO_PB_DOUTSET GPIO_Px_DOUTSET(GPIO_PB) #define GPIO_PB_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PB) #define GPIO_PB_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PB) #define GPIO_PB_DIN GPIO_Px_DIN(GPIO_PB) #define GPIO_PB_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PB) #define GPIO_PC (GPIO_BASE + 0x048) #define GPIO_PC_CTRL GPIO_Px_CTRL(GPIO_PC) #define GPIO_PC_MODEL GPIO_Px_MODEL(GPIO_PC) #define GPIO_PC_MODEH GPIO_Px_MODEH(GPIO_PC) #define GPIO_PC_DOUT GPIO_Px_DOUT(GPIO_PC) #define GPIO_PC_DOUTSET GPIO_Px_DOUTSET(GPIO_PC) #define GPIO_PC_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PC) #define GPIO_PC_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PC) #define GPIO_PC_DIN GPIO_Px_DIN(GPIO_PC) #define GPIO_PC_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PC) #define GPIO_PD (GPIO_BASE + 0x06C) #define GPIO_PD_CTRL GPIO_Px_CTRL(GPIO_PD) #define GPIO_PD_MODEL GPIO_Px_MODEL(GPIO_PD) #define GPIO_PD_MODEH GPIO_Px_MODEH(GPIO_PD) #define GPIO_PD_DOUT GPIO_Px_DOUT(GPIO_PD) #define GPIO_PD_DOUTSET GPIO_Px_DOUTSET(GPIO_PD) #define GPIO_PD_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PD) #define GPIO_PD_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PD) #define GPIO_PD_DIN GPIO_Px_DIN(GPIO_PD) #define GPIO_PD_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PD) #define GPIO_PE (GPIO_BASE + 0x090) #define GPIO_PE_CTRL GPIO_Px_CTRL(GPIO_PE) #define GPIO_PE_MODEL GPIO_Px_MODEL(GPIO_PE) #define GPIO_PE_MODEH GPIO_Px_MODEH(GPIO_PE) #define GPIO_PE_DOUT GPIO_Px_DOUT(GPIO_PE) #define GPIO_PE_DOUTSET GPIO_Px_DOUTSET(GPIO_PE) #define GPIO_PE_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PE) #define GPIO_PE_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PE) #define GPIO_PE_DIN GPIO_Px_DIN(GPIO_PE) #define GPIO_PE_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PE) #define GPIO_PF (GPIO_BASE + 0x0B4) #define GPIO_PF_CTRL GPIO_Px_CTRL(GPIO_PF) #define GPIO_PF_MODEL GPIO_Px_MODEL(GPIO_PF) #define GPIO_PF_MODEH GPIO_Px_MODEH(GPIO_PF) #define GPIO_PF_DOUT GPIO_Px_DOUT(GPIO_PF) #define GPIO_PF_DOUTSET GPIO_Px_DOUTSET(GPIO_PF) #define GPIO_PF_DOUTCLR GPIO_Px_DOUTCLR(GPIO_PF) #define GPIO_PF_DOUTTGL GPIO_Px_DOUTTGL(GPIO_PF) #define GPIO_PF_DIN GPIO_Px_DIN(GPIO_PF) #define GPIO_PF_PINLOCKN GPIO_Px_PINLOCKN(GPIO_PF) #define GPIO_EXTIPSELL MMIO32(GPIO_BASE + 0x100) /**< @see EFM32TG_GPIO_EXTIP_values */ #define GPIO_EXTIPSELH MMIO32(GPIO_BASE + 0x104) /**< @see EFM32TG_GPIO_EXTIP_values */ #define GPIO_EXTIRISE MMIO32(GPIO_BASE + 0x108) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_EXTIFALL MMIO32(GPIO_BASE + 0x10C) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_IEN MMIO32(GPIO_BASE + 0x110) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_IF MMIO32(GPIO_BASE + 0x114) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_IFS MMIO32(GPIO_BASE + 0x118) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_IFC MMIO32(GPIO_BASE + 0x11C) /**< @see EFM32TG_GPIO_pinnumberbits */ #define GPIO_ROUTE MMIO32(GPIO_BASE + 0x120) /**< @see EFM32TG_GPIO_ROUTE_bits */ #define GPIO_INSENSE MMIO32(GPIO_BASE + 0x124) /**< @see EFM32TG_GPIO_INSENSE_bits */ #define GPIO_LOCK MMIO32(GPIO_BASE + 0x128) /**< @see EFM32TG_GPIO_LOCK_values */ #define GPIO_CTRL MMIO32(GPIO_BASE + 0x12C) /**< @see EFM32TG_GPIO_CTRL_bits */ #define GPIO_CMD MMIO32(GPIO_BASE + 0x130) /**< @see EFM32TG_GPIO_CMD_bits */ #define GPIO_EM4WUEN MMIO32(GPIO_BASE + 0x134) /**< @see EFM32TG_GPIO_EM4WUEN_bits */ #define GPIO_EM4WUPOL MMIO32(GPIO_BASE + 0x138) /**< @see EFM32TG_GPIO_EM4WUPOL_bits */ #define GPIO_EM4WUCAUSE MMIO32(GPIO_BASE + 0x13C) /**< @see EFM32TG_GPIO_EM4WUCAUSE_bits */ /** @} */ /** Pin number bits * * Provided for convenience. They can be used on the GPIO_Px_DOUT, * GPIO_Px_DOUTSET, GPIO_Px_DOUTCLR, GPIO_Px_DOUTTGL, GPIO_Px_DIN, * GPIO_Px_PINLOCKN, GPIO_Px_EXTIRISE, GPIO_Px_EXTIFALL, GPIO_IEN, GPIO_IF, * GPIO_IFS, and GPIO_IFC registers. * * @defgroup EFM32TG_GPIO_pinnumberbits EFM32 Tiny Gecko GPIO pin number bits * @{ */ #define GPIO0 (1 << 0) #define GPIO1 (1 << 1) #define GPIO2 (1 << 2) #define GPIO3 (1 << 3) #define GPIO4 (1 << 4) #define GPIO5 (1 << 5) #define GPIO6 (1 << 6) #define GPIO7 (1 << 7) #define GPIO8 (1 << 8) #define GPIO9 (1 << 9) #define GPIO10 (1 << 10) #define GPIO11 (1 << 11) #define GPIO12 (1 << 12) #define GPIO13 (1 << 13) #define GPIO14 (1 << 14) #define GPIO15 (1 << 15) #define GPIO_ALL 0xffff /** @} */ /** Bit states for the GPIO_Px_CTRL register * * They are named as in d0034_efm32tg_reference_manual.pdf's section * 28.5.1. * * @defgroup EFM32TG_GPIO_Px_CTRL_bits EFM32 Tiny Gecko GPIO Px CTRL bits * @{ */ #define GPIO_CTRL_DRIVEMODE_STANDARD 0 /**< 6mA drive current */ #define GPIO_CTRL_DRIVEMODE_LOWEST 1 /**< 0.5mA drive current */ #define GPIO_CTRL_DRIVEMODE_HIGH 2 /**< 20mA drive current */ #define GPIO_CTRL_DRIVEMODE_LOW 3 /**< 2mA drive current */ /** @} */ /** These are the modes defined for the MODEx fields in the GPIO_Px_MODEL and * GPIO_Px_MODEH registers. * * These bit state definitions are not localized, meaning that they have to be * bitshifted by multiples of 4 to configure other pins than 0; configurations * for pins 0 to 7 go to GPIO_Px_MODEL (shifted by 4*pin), configurations for * pins 8 to 15 go to GPIO_Px_MODEH (shifted by 4*(pin-8)). * * For example, to set the mode for the 3rd pin of port A to pushpull, set * `GPIO_PA_MODEL = GPIO_MODE_PUSHPULL << (3*4);`. * * @todo Update the example as soon as there are convenience functions to do * this properly. * * They are named as in d0034_efm32tg_reference_manual.pdf's sections * 28.5.2/28.5.3. For explanations of what they really do, rather see section * 28.3.1. * * @defgroup EFM32TG_GPIO_MODE_values EFM32 Tiny Gecko GPIO MODE values * @{ */ #define GPIO_MODE_DISABLED 0 #define GPIO_MODE_INPUT 1 #define GPIO_MODE_INPUTPULL 2 #define GPIO_MODE_INPUTPULLFILTER 3 #define GPIO_MODE_PUSHPULL 4 #define GPIO_MODE_PUSHPULLDRIVE 5 #define GPIO_MODE_WIREDOR 6 #define GPIO_MODE_WIREDORPULLDOWN 7 #define GPIO_MODE_WIREDAND 8 #define GPIO_MODE_WIREDANDFILTER 9 #define GPIO_MODE_WIREDANDPULLUP 10 #define GPIO_MODE_WIREDANDPULLUPFILTER 11 #define GPIO_MODE_WIREDANDDRIVE 12 #define GPIO_MODE_WIREDANDDRIVEFILTER 13 #define GPIO_MODE_WIREDANDDRIVEPULLUP 14 #define GPIO_MODE_WIREDANDDRIVEPULLUPFILTER 15 #define GPIO_MODE_MASK 0x0f /** @} */ /** These are the modes defined for the EXTIPSELx fields in the GPIO_EXTIPSELL * and GPIO_EXTIPSELH registers. * * These bit state definitions are not localized, meaning that they have to be * bitshifted by multiples of 4 to configure other pins than 0; configurations * for pins 0 to 7 go to GPIO_EXTIPSELL (shifted by 4*pin), configurations for * pins 8 to 15 go to GPIO_EXTIPSELH (shifted by 4*(pin-8)). * * They are named as in d0034_efm32tg_reference_manual.pdf's sections * 28.5.10/28.5.11. For explanations of what they do, rather see section * 28.3.5. * * @defgroup EFM32TG_GPIO_EXTIP_values EFM32 Tiny Gecko GPIO EXTIPSEL values * @{ */ #define GPIO_EXTIPSEL_PORTA 0 /**< Port A pin x selected for external interrupt x */ #define GPIO_EXTIPSEL_PORTB 1 /**< Port B pin x selected for external interrupt x */ #define GPIO_EXTIPSEL_PORTC 2 /**< Port C pin x selected for external interrupt x */ #define GPIO_EXTIPSEL_PORTD 3 /**< Port D pin x selected for external interrupt x */ #define GPIO_EXTIPSEL_PORTE 4 /**< Port E pin x selected for external interrupt x */ #define GPIO_EXTIPSEL_PORTF 5 /**< Port F pin x selected for external interrupt x */ /** @} */ /** Bit states for the GPIO_ROUTE register * * See d0034_efm32tg_reference_manual.pdf section 28.5.18 for definitions, and * 28.3.4.1 for explanations. * * @defgroup EFM32TG_GPIO_ROUTE_bits EFM32 Tiny Gecko GPIO ROUTE bits * @{ */ #define GPIO_ROUTE_SWLOCATION_MASK (0x03<<8) #define GPIO_ROUTE_SWLOCATION_LOC0 (0<<8) /**< Route SW pins to location 0 (see chip data sheet for exact pins */ #define GPIO_ROUTE_SWLOCATION_LOC1 (1<<8) /**< Route SW pins to location 1 (see chip data sheet for exact pins */ #define GPIO_ROUTE_SWLOCATION_LOC2 (2<<8) /**< Route SW pins to location 2 (see chip data sheet for exact pins */ #define GPIO_ROUTE_SWLOCATION_LOC3 (3<<8) /**< Route SW pins to location 3 (see chip data sheet for exact pins */ #define GPIO_ROUTE_SWOPEN (1<<2) /**< Serial Wire Viewer Output pin enabled */ #define GPIO_ROUTE_SWDIOPEN (1<<1) /**< Serial Wire Data pin enabled */ #define GPIO_ROUTE_SWCLKPEN (1<<0) /**< Serial Wire Clock pin enabled */ /** @} */ /** Bit states for the GPIO_INSENSE register * * See d0034_efm32tg_reference_manual.pdf section 28.5.19 for definitions, and * 28.3.7 for details. * * @defgroup EFM32TG_GPIO_INSENSE_bits EFM32 Tiny Gecko GPIO INSENSE bits * @{ */ #define GPIO_INSENSE_PRS (1<<1) /**< Input sensing for PRS enabled */ #define GPIO_INSENSE_INT (1<<0) /**< Input sensing for interrupts enabled */ /** @} */ /** Values for the GPIO_LOCK register * * See d0034_efm32tg_reference_manual.pdf section 28.5.20 for definitions, and * 28.3.1.1 for explanations. * * @defgroup EFM32TG_GPIO_LOCK_values EFM32 Tiny Gecko GPIO LOCK bits * @{ */ #define GPIO_LOCK_IS_UNLOCKED 0 /**< When the LOCK register reads as this value, it is open */ #define GPIO_LOCK_IS_LOCKED 1 /**< When the LOCK register reads as this value, it is locked */ #define GPIO_LOCK_SET_LOCKED 0 /**< Write this to the LOCK register to lock down GPIO */ #define GPIO_LOCK_SET_UNLOCKED 0xa543 /**< Write this to the LOCK register to unlock the GPIO */ /** @} */ /** Bit states for the GPIO_CTRL register * * See d0034_efm32tg_reference_manual.pdf section 28.5.21 for definitions, and * 28.3.4 for explanations. * * @defgroup EFM32TG_GPIO_CTRL_bits EFM32 Tiny Gecko GPIO CTRL bits * @{ */ #define GPIO_CTRL_EM4RET (1<<0) /**< Retention of states in EM4 */ /** @} */ /** Bit states for the GPIO_CMD register * * See d0034_efm32tg_reference_manual.pdf section 28.5.22 for definitions and * figure 28.5 in case you wonder if that register is mentioned anywhere else * at all. * * @defgroup EFM32TG_GPIO_CMD_bits EFM32 Tiny Gecko GPIO CMD bits * @{ */ #define GPIO_CMD_EM4WUCLR (1<<0) /**< Write this flag to clear EM4 wakeup requests */ /** @} */ /** Bit states for the GPIO_EM4WUEN register * * See d0034_efm32tg_reference_manual.pdf section 28.5.23 for definitions, and * 28.3.2 for explanations. * * @defgroup EFM32TG_GPIO_EM4WUEN_bits EFM32 Tiny Gecko GPIO EM4WUEN bits * @{ */ #define GPIO_EM4WUEN_A0 0x01 /**< Wake up from EM4 on A0 activity */ #define GPIO_EM4WUEN_A6 0x02 /**< Wake up from EM4 on A6 activity */ #define GPIO_EM4WUEN_C9 0x04 /**< Wake up from EM4 on C9 activity */ #define GPIO_EM4WUEN_F1 0x08 /**< Wake up from EM4 on F1 activity */ #define GPIO_EM4WUEN_F3 0x10 /**< Wake up from EM4 on F3 activity */ #define GPIO_EM4WUEN_E13 0x20 /**< Wake up from EM4 on E13 activity */ /** @} */ /** Bit states for the GPIO_EM4WUPOL register * * See d0034_efm32tg_reference_manual.pdf section 28.5.24 for definitions, and * 28.3.2 for explanations. * * @defgroup EFM32TG_GPIO_EM4WUPOL_bits EFM32 Tiny Gecko GPIO EM4WUPOL bits * @{ */ #define GPIO_EM4WUPOL_A0 0x01 /**< High wake up from EM4 on A0 */ #define GPIO_EM4WUPOL_A6 0x02 /**< High wake up from EM4 on A6 */ #define GPIO_EM4WUPOL_C9 0x04 /**< High wake up from EM4 on C9 */ #define GPIO_EM4WUPOL_F1 0x08 /**< High wake up from EM4 on F1 */ #define GPIO_EM4WUPOL_F3 0x10 /**< High wake up from EM4 on F3 */ #define GPIO_EM4WUPOL_E13 0x20 /**< High wake up from EM4 on E13 */ /** @} */ /** Bit states for the GPIO_EM4WUCAUSE register * * See d0034_efm32tg_reference_manual.pdf section 28.5.25 for definitions, and * 28.3.2 for explanations. * * @defgroup EFM32TG_GPIO_EM4WUCAUSE_bits EFM32 Tiny Gecko GPIO EM4WUCAUSE bits * @{ */ #define GPIO_EM4WUCAUSE_A0 0x01 /**< Woke up from EM4 on A0 */ #define GPIO_EM4WUCAUSE_A6 0x02 /**< Woke up from EM4 on A6 */ #define GPIO_EM4WUCAUSE_C9 0x04 /**< Woke up from EM4 on C9 */ #define GPIO_EM4WUCAUSE_F1 0x08 /**< Woke up from EM4 on F1 */ #define GPIO_EM4WUCAUSE_F3 0x10 /**< Woke up from EM4 on F3 */ #define GPIO_EM4WUCAUSE_E13 0x20 /**< Woke up from EM4 on E13 */ /** @} */ /** @} */ /** GPIO convenience functions * * These functions try to be close to the STM32 F1 utility functions where * possible. * * The functions intentionally don't cover all the possible read- and write * operations to the GPIO registers. For example, reading the configured output * strength for a port is rarely required. * * Many convenience functions are static to allow inlining by the compiler. * * @todo Implement all the non-trivial but useful convenience functions. * * @defgroup EFM32TG_GPIO_convenience EFM32 Tiny Gecko GPIO convenience functions * @{ */ /** Set a whole GPIO port's out data to a particular value * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param gpios Bit pattern the output of the port will be configured to (eg GPIO6|GPIO3 to switch pins 6 and 3 to high and all the others to low) */ static void gpio_port_write(u32 gpioport, u16 data) { GPIO_Px_DOUT(gpioport) = data; } /** Set some bits in a GPIO port's out data * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param gpios GPIO pin(s) to be set to 1 (eg GPIO6|GPIO3 to switch pins 6 and 3 to high and leave all the others in their previous state) */ static void gpio_set(u32 gpioport, u16 gpios) { GPIO_Px_DOUTSET(gpioport) = gpios; } /** Clear some bits in a GPIO port's out data * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param gpios GPIO pin(s) to be set to 0 (eg GPIO6|GPIO3 to switch pins 6 and 3 to low and leave all the others in their previous state) */ static void gpio_clear(u32 gpioport, u16 gpios) { GPIO_Px_DOUTCLR(gpioport) = gpios; } /** Toggle some bits in a GPIO port's out data * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param gpios GPIO pin(s) that will be toggled (eg GPIO6|GPIO3 to toggle the output directions of pins 6 and 3 and leave all the others in their previous state) */ static void gpio_toggle(u32 gpioport, u16 gpios) { GPIO_Px_DOUTTGL(gpioport) = gpios; } /** Read input bits from a GPIO's port in data * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \returns Current value of the in register of the given port */ static u16 gpio_port_read(u32 gpioport) { return GPIO_Px_DIN(gpioport); } /** Read input bits from a GPIO's port in data * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param gpios Bits that will be read (eg GPIO6|GPIO3 to read pins 6 and 3) * \returns Bit pattern that contains 1 in all pin positions that currently read as high (eg GPIO6 if port A's 6th pin is currently high and the 3rd pin is low) */ static u16 gpio_get(u32 gpioport, u16 gpios) { return gpio_port_read(gpioport) & gpios; } /** Configure a particular pin configuration on one or more pins * * This function is not atomic. It has to be made sure that it is not * interrupted by other code that modifies the port's configuration. * * @todo Find out if that is really the case (if &= and |= are atomic, the * worst thing that happens when this function is interrupted with itself is * that the ports stay disabled for the time being, which is to be expected * anyway when changing a pin's mode. * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param mode Pin configuration mode to set (eg GPIO_MODE_INPUT) * \param gpios Pins to configure (eg GPIO6|GPIO3 to set the mode on pins 6 and 3) */ void gpio_set_mode(u32 gpioport, u8 mode, u16 gpios); /** Configure the alternate drive strength for a port * * \param gpioport Address of a GPIO port to use (eg GPIO_PA) * \param strength Alternate drive strength to configure for the port (eg GPIO_CTRL_DRIVEMODE_HIGH) */ static void gpio_set_strength(u32 gpioport, u8 strength) { GPIO_Px_CTRL(gpioport) = strength; } /** @} */ /** @} */ #endif