diff options
Diffstat (limited to 'src/stmf0/ao_exti_stm.c')
| -rw-r--r-- | src/stmf0/ao_exti_stm.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/stmf0/ao_exti_stm.c b/src/stmf0/ao_exti_stm.c new file mode 100644 index 00000000..910afcf7 --- /dev/null +++ b/src/stmf0/ao_exti_stm.c @@ -0,0 +1,149 @@ +/* + * Copyright © 2016 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); + +uint32_t ao_last_exti; + +static void ao_exti_range_isr(uint8_t first, uint8_t last, uint16_t mask) { + uint16_t pending = (ao_last_exti = stm_exti.pr) & mask; + uint8_t pin; + static uint16_t last_mask; + static uint8_t last_pin; + + if (pending == last_mask) { + stm_exti.pr = last_mask; + (*ao_exti_callback[last_pin])(); + return; + } + stm_exti.pr = pending; + for (pin = first; pin <= last; pin++) + if ((pending & ((uint32_t) 1 << pin)) && ao_exti_callback[pin]) { + last_mask = (1 << pin); + last_pin = pin; + (*ao_exti_callback[pin])(); + } +} + +void stm_exti0_1_isr(void) { ao_exti_range_isr(0, 1, 0x0003); } +void stm_exti2_3_isr(void) { ao_exti_range_isr(2, 3, 0x000c); } +void stm_exti4_15_isr(void) { ao_exti_range_isr(4, 15, 0xfff0); } + +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; + uint8_t prio; + + ao_exti_callback[pin] = callback; + + /* configure gpio to interrupt routing */ + stm_exticr_set(gpio, pin); + + if (!(mode & AO_EXTI_PIN_NOCONFIGURE)) { + /* 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; + if (mode & AO_EXTI_MODE_RISING) + stm_exti.rtsr |= mask; + else + stm_exti.rtsr &= ~mask; + if (mode & AO_EXTI_MODE_FALLING) + stm_exti.ftsr |= mask; + else + stm_exti.ftsr &= ~mask; + + if (pin <= 1) + irq = STM_ISR_EXTI0_1_POS; + else if (pin <= 3) + irq = STM_ISR_EXTI2_3_POS; + else + irq = STM_ISR_EXTI4_15_POS; + + /* Set priority */ + prio = AO_STM_NVIC_MED_PRIORITY; + if (mode & AO_EXTI_PRIORITY_LOW) + prio = AO_STM_NVIC_LOW_PRIORITY; + else if (mode & AO_EXTI_PRIORITY_HIGH) + prio = AO_STM_NVIC_HIGH_PRIORITY; + + stm_nvic_set_priority(irq, prio); + stm_nvic_set_enable(irq); +} + +void +ao_exti_set_mode(struct stm_gpio *gpio, uint8_t pin, uint8_t mode) { + (void) gpio; + + uint32_t mask = 1 << pin; + + if (mode & AO_EXTI_MODE_RISING) + stm_exti.rtsr |= mask; + else + stm_exti.rtsr &= ~mask; + if (mode & AO_EXTI_MODE_FALLING) + stm_exti.ftsr |= mask; + else + stm_exti.ftsr &= ~mask; +} + +void +ao_exti_set_callback(struct stm_gpio *gpio, uint8_t pin, void (*callback)()) { + (void) gpio; + ao_exti_callback[pin] = callback; +} + +void +ao_exti_enable(struct stm_gpio *gpio, uint8_t pin) { + uint32_t mask = (1 << pin); + (void) gpio; + stm_exti.pr = mask; + stm_exti.imr |= (1 << pin); +} + +void +ao_exti_disable(struct stm_gpio *gpio, uint8_t pin) { + uint32_t mask = (1 << pin); + (void) gpio; + stm_exti.imr &= ~mask; + stm_exti.pr = mask; +} + +void +ao_exti_init(void) +{ +} |