diff options
Diffstat (limited to 'libmaple/gpio.h')
| -rw-r--r-- | libmaple/gpio.h | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/libmaple/gpio.h b/libmaple/gpio.h index 49360ee..53f77c4 100644 --- a/libmaple/gpio.h +++ b/libmaple/gpio.h @@ -42,15 +42,18 @@ * Alternate function open-drain * * - After reset, the alternate functions are not active and IO prts - * are set to Input Floating mode */ + * are set to Input Floating mode, EXCEPT for the Serial Wire and JTAG + * ports, which are in alternate function mode by default. */ -#define GPIOA_BASE (GPIO_Port*)0x40010800 -#define GPIOB_BASE (GPIO_Port*)0x40010C00 -#define GPIOC_BASE (GPIO_Port*)0x40011000 -#define GPIOD_BASE (GPIO_Port*)0x40011400 -#define GPIOE_BASE (GPIO_Port*)0x40011800 // High-density devices only -#define GPIOF_BASE (GPIO_Port*)0x40011C00 // High-density devices only -#define GPIOG_BASE (GPIO_Port*)0x40012000 // High-density devices only +#define AFIO_MAPR ((volatile uint32*)0x40010004) + +#define GPIOA_BASE ((GPIO_Port*)0x40010800) +#define GPIOB_BASE ((GPIO_Port*)0x40010C00) +#define GPIOC_BASE ((GPIO_Port*)0x40011000) +#define GPIOD_BASE ((GPIO_Port*)0x40011400) +#define GPIOE_BASE ((GPIO_Port*)0x40011800) // High-density devices only +#define GPIOF_BASE ((GPIO_Port*)0x40011C00) // High-density devices only +#define GPIOG_BASE ((GPIO_Port*)0x40012000) // High-density devices only #define GPIO_SPEED_50MHZ (0x3) @@ -109,6 +112,13 @@ static inline uint32 gpio_read_bit(GPIO_Port *port, uint8 gpio_pin) { return (port->IDR & BIT(gpio_pin) ? 1 : 0); } +/* For pins configured as output push-pull, reading the ODR returns + * the last value written in push-pull mode. + */ +static inline void gpio_toggle_pin(GPIO_Port *port, uint8 gpio_pin) { + port->ODR = port->ODR ^ BIT(gpio_pin); +} + #ifdef __cplusplus } // extern "C" #endif |