diff options
Diffstat (limited to 'src/stm/ao_exti_stm.c')
| -rw-r--r-- | src/stm/ao_exti_stm.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/stm/ao_exti_stm.c b/src/stm/ao_exti_stm.c new file mode 100644 index 00000000..013d453b --- /dev/null +++ b/src/stm/ao_exti_stm.c @@ -0,0 +1,109 @@ +/* + * Copyright © 2012 Keith Packard <keithp@keithp.com> + * + * 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; version 2 of the License. + * + * 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., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include <ao.h> +#include <ao_exti.h> + +static void (*ao_exti_callback[16])(void); + +static void +ao_exti_isr(void) { + uint32_t pending = stm_exti.pr; + uint8_t pin; + + /* Clear pending interrupts */ + stm_exti.pr = pending; + for (pin = 0; pin < 16 && pending; pin++) { + uint32_t mask = (1 << pin); + + if (pending & mask) { + pending &= ~mask; + if (ao_exti_callback[pin]) + (*ao_exti_callback[pin])(); + } + } +} + +void stm_exti0_isr(void) { ao_exti_isr(); } +void stm_exti1_isr(void) { ao_exti_isr(); } +void stm_exti2_isr(void) { ao_exti_isr(); } +void stm_exti3_isr(void) { ao_exti_isr(); } +void stm_exti4_isr(void) { ao_exti_isr(); } +void stm_exti9_5_isr(void) { ao_exti_isr(); } +void stm_exti15_10_isr(void) { ao_exti_isr(); } + +void +ao_exti_setup (struct stm_gpio *gpio, uint8_t pin, uint8_t mode, void (*callback)(void)) { + uint32_t mask = 1 << pin; + uint32_t pupdr; + uint8_t irq; + + ao_exti_callback[pin] = callback; + /* configure pin as input, setting selected pull-up/down mode */ + stm_moder_set(gpio, pin, STM_MODER_INPUT); + switch (mode & (AO_EXTI_MODE_PULL_UP|AO_EXTI_MODE_PULL_DOWN)) { + case 0: + default: + pupdr = STM_PUPDR_NONE; + break; + case AO_EXTI_MODE_PULL_UP: + pupdr = STM_PUPDR_PULL_UP; + break; + case AO_EXTI_MODE_PULL_DOWN: + pupdr = STM_PUPDR_PULL_DOWN; + break; + } + stm_pupdr_set(gpio, pin, pupdr); + + /* Set interrupt mask and rising/falling mode */ + stm_exti.imr &= ~mask; + stm_exti.rtsr |= mask; + if (mode & AO_EXTI_MODE_RISING) + stm_exti.rtsr |= mask; + if (mode & AO_EXTI_MODE_FALLING) + stm_exti.ftsr |= mask; + + if (pin <= 4) + irq = STM_ISR_EXTI0_POS + pin; + else if (pin <= 9) + irq = STM_ISR_EXTI9_5_POS; + else + irq = STM_ISR_EXTI15_10_POS; + stm_nvic_set_priority(irq, 10); + stm_nvic_set_enable(irq); +} + +void +ao_exti_enable(struct stm_gpio *gpio, uint8_t pin) { + stm_exti.imr |= (1 << pin); +} + +void +ao_exti_disable(struct stm_gpio *gpio, uint8_t pin) { + stm_exti.imr &= ~(1 << pin); +} + +void +ao_exti_init(void) +{ + stm_nvic_set_priority(STM_ISR_EXTI1_POS, 10); + stm_nvic_set_priority(STM_ISR_EXTI2_POS, 10); + stm_nvic_set_priority(STM_ISR_EXTI3_POS, 10); + stm_nvic_set_priority(STM_ISR_EXTI4_POS, 10); + stm_nvic_set_priority(STM_ISR_EXTI9_5_POS, 10); + stm_nvic_set_priority(STM_ISR_EXTI15_10_POS, 10); +} |