diff options
Diffstat (limited to 'libmaple/exti.h')
| -rw-r--r-- | libmaple/exti.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libmaple/exti.h b/libmaple/exti.h new file mode 100644 index 0000000..c728454 --- /dev/null +++ b/libmaple/exti.h @@ -0,0 +1,152 @@ +/* ***************************************************************************** + * 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 <http://www.gnu.org/licenses/>. + * + * Created: 12/18/09 02:35:33 + * Copyright (c) 2009 Perry L. Hung. All rights reserved. + * + * ****************************************************************************/ + +/** + * @file exti.h + * + * @brief External interrupt control prototypes and defines + */ + +#ifndef _EXTI_H_ +#define _EXTI_H_ + +#include <inttypes.h> +/* Notes: + * + * To generate the interrupt, the interrupt line should be configured and + * enabled. This is done by programming the two trigger registers with the + * desired edge detection and by enabling the interrupt request by writing a + * '1' to the corresponding bit in the interrupt mask register. When the + * selected edge occurs on the external interrupt line, an interrupt request is + * generated. The pending bit corresponding to the interrupt line is also set. + * This request is reset by writing a '1' in the pending register. + * + * Hardware interrupt selection: + * To configure the 20 lines as interrupt sources, use the following procedure: + * 1) Configure AFIO_EXTIICR[y] to select the source input for EXTIx external + * interrupt + * 2) Configure the mask bits of the 20 interrupt lines (EXTI_IMR) + * 3) Configure the trigger selection bits of the interrupt lines (EXTI_RTSR and EXTI_FTSR) + * 4) Configure the enable and mask bits that control the NVIC_IRQ channel mapped to the External + * Interrupt Controller (EXTI) so that an inerrupt coming from one of the 20 lines + * can be correctly acknowledged. + * + * AFIO clock must be on. + * + * RM0008, page 107: "PD0, PD1 cannot be used for external interrupt/event generation + * on 36, 48, 64-bin packages." + * + * ---------------------------------------------------------------------------- + * Pin to EXTI Line Mappings: + * EXTI0 EXTI1 EXTI2 EXTI3 EXTI4 + * ---------------------------------------------------------------------------- + * D2/PA0 D3/PA1 D1/PA2 D0/A6/PA3 D10/A10/PA4 + * D26/EXT7/PB0 D27/EXT8/PB1 D16/A2/PC2 D17/A3/PC3 D18/A4/PC4 + * D14/A0/PC0 D15/PC1 D25/EXT5/PD2 + * + * EXTI5 EXTI6 EXTI7 EXTI8 EXTI9 + * ---------------------------------------------------------------------------- + * D13/A13/PA5 D12/A12/PA6 D11/A11/PA7 D6/PA8 D7/PA9 + * D4/PB5 D5/PB6 D9/PB7 D38/PB8 D23/EXT4/PB9 + * D19/A5/PC5 D34/EXTI15/PC6 D35/EXT16/PC7 D36/PC8 D37/EXT18/PC9 + * + * EXTI10 EXTI11 EXTI12 EXTI13 EXTI14 + * ---------------------------------------------------------------------------- + * D8/PA10 D29/EXT10/PB11 D30/EXTI1/PB12 D31/EXTI12/PB13 D32/EXT13/PB14 + * D28/PB10 D20/EXTI1/PC13 D21/EXT2/PC14 + * D25/PC10 + * + * EXTI15 + * ---------------------------------------------------------------------------- + * D33/EXTI14/PB15 + * D22/EXT3/PC15 + * + * + * The 16 EXTI interrupts are mapped to 7 interrupt handlers. + * + * EXTI Lines to Interrupt Mapping: + * EXTI0 -> EXTI0 + * EXTI1 -> EXTI1 + * EXTI2 -> EXTI2 + * EXTI3 -> EXTI3 + * EXTI4 -> EXTI4 + * EXTI[5-9] -> EXT9_5 + * EXTI[10-15] -> EXT15_10 + * + * + * */ + +#define NR_EXTI_CHANNELS 16 +#define NR_EXTI_PORTS 4 +#define NR_EXTI_MODES 3 + +#define EXTI_IMR 0x40010400 // Interrupt mask register +#define EXTI_EMR (EXTI_IMR + 0x04) // Event mask register +#define EXTI_RTSR (EXTI_IMR + 0x08) // Rising trigger selection register +#define EXTI_FTSR (EXTI_IMR + 0x0C) // Falling trigger selection register +#define EXTI_SWIER (EXTI_IMR + 0x10) // Software interrupt event register +#define EXTI_PR (EXTI_IMR + 0x14) // Pending register + +#define AFIO_EVCR 0x40010000 +#define AFIO_EXTICR1 (AFIO_EVCR + 0x08) +#define AFIO_EXTICR2 (AFIO_EVCR + 0x0C) +#define AFIO_EXTICR3 (AFIO_EVCR + 0x10) +#define AFIO_EXTICR4 (AFIO_EVCR + 0x14) + +#define EXTI_RISING 0 +#define EXTI_FALLING 1 +#define EXTI_RISING_FALLING 2 + +#define EXTI0 0 +#define EXTI1 1 +#define EXTI2 2 +#define EXTI3 3 +#define EXTI4 4 +#define EXTI5 5 +#define EXTI6 6 +#define EXTI7 7 +#define EXTI8 8 +#define EXTI9 9 +#define EXTI10 10 +#define EXTI11 11 +#define EXTI12 12 +#define EXTI13 13 +#define EXTI14 14 +#define EXTI15 15 + +#define EXTI_CONFIG_PORTA 0 +#define EXTI_CONFIG_PORTB 1 +#define EXTI_CONFIG_PORTC 2 +#define EXTI_CONFIG_PORTD 3 + + +#ifdef __cplusplus +extern "C"{ +#endif + +void exti_attach_interrupt(uint8_t, uint8_t, voidFuncPtr, uint8_t); +void exti_detach_interrupt(uint8_t); + +#ifdef __cplusplus +} // extern "C" +#endif + + +#endif + |