diff options
Diffstat (limited to 'watch-library/hal/src/hal_ext_irq.c')
| -rw-r--r-- | watch-library/hal/src/hal_ext_irq.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/watch-library/hal/src/hal_ext_irq.c b/watch-library/hal/src/hal_ext_irq.c new file mode 100644 index 00000000..d0b92927 --- /dev/null +++ b/watch-library/hal/src/hal_ext_irq.c @@ -0,0 +1,188 @@ +/** + * \file + * + * \brief External interrupt functionality imkplementation. + * + * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries. + * + * \asf_license_start + * + * \page License + * + * Subject to your compliance with these terms, you may use Microchip + * software and any derivatives exclusively with Microchip products. + * It is your responsibility to comply with third party license terms applicable + * to your use of third party software (including open source software) that + * may accompany Microchip software. + * + * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, + * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, + * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, + * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE + * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL + * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE + * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE + * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT + * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY + * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, + * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE. + * + * \asf_license_stop + * + */ + +#include "hal_ext_irq.h" + +#define EXT_IRQ_AMOUNT 3 + +/** + * \brief Driver version + */ +#define DRIVER_VERSION 0x00000001u + +/** + * \brief External IRQ struct + */ +struct ext_irq { + ext_irq_cb_t cb; + uint32_t pin; +}; + +/* Remove KEIL compiling error in case no IRQ line selected */ +#if EXT_IRQ_AMOUNT == 0 +#undef EXT_IRQ_AMOUNT +#define EXT_IRQ_AMOUNT 1 +#endif + +/** + * \brief Array of external IRQs callbacks + */ +static struct ext_irq ext_irqs[EXT_IRQ_AMOUNT]; + +static void process_ext_irq(const uint32_t pin); + +/** + * \brief Initialize external irq component if any + */ +int32_t ext_irq_init(void) +{ + uint16_t i; + + for (i = 0; i < EXT_IRQ_AMOUNT; i++) { + ext_irqs[i].pin = 0xFFFFFFFF; + ext_irqs[i].cb = NULL; + } + + return _ext_irq_init(process_ext_irq); +} + +/** + * \brief Deinitialize external irq if any + */ +int32_t ext_irq_deinit(void) +{ + return _ext_irq_deinit(); +} + +/** + * \brief Register callback for the given external interrupt + */ +int32_t ext_irq_register(const uint32_t pin, ext_irq_cb_t cb) +{ + uint8_t i = 0, j = 0; + bool found = false; + + for (; i < EXT_IRQ_AMOUNT; i++) { + if (ext_irqs[i].pin == pin) { + ext_irqs[i].cb = cb; + found = true; + break; + } + } + + if (NULL == cb) { + if (!found) { + return ERR_INVALID_ARG; + } + return _ext_irq_enable(pin, false); + } + + if (!found) { + for (i = 0; i < EXT_IRQ_AMOUNT; i++) { + if (NULL == ext_irqs[i].cb) { + ext_irqs[i].cb = cb; + ext_irqs[i].pin = pin; + found = true; + break; + } + } + for (; (j < EXT_IRQ_AMOUNT) && (i < EXT_IRQ_AMOUNT); j++) { + if ((ext_irqs[i].pin < ext_irqs[j].pin) && (ext_irqs[j].pin != 0xFFFFFFFF)) { + struct ext_irq tmp = ext_irqs[j]; + + ext_irqs[j] = ext_irqs[i]; + ext_irqs[i] = tmp; + } + } + } + + if (!found) { + return ERR_INVALID_ARG; + } + + return _ext_irq_enable(pin, true); +} + +/** + * \brief Enable external irq + */ +int32_t ext_irq_enable(const uint32_t pin) +{ + return _ext_irq_enable(pin, true); +} + +/** + * \brief Disable external irq + */ +int32_t ext_irq_disable(const uint32_t pin) +{ + return _ext_irq_enable(pin, false); +} + +/** + * \brief Retrieve the current driver version + */ +uint32_t ext_irq_get_version(void) +{ + return DRIVER_VERSION; +} + +/** + * \brief Interrupt processing routine + * + * \param[in] pin The pin which triggered the interrupt + */ +static void process_ext_irq(const uint32_t pin) +{ + uint8_t lower = 0, middle, upper = EXT_IRQ_AMOUNT; + + while (upper >= lower) { + middle = (upper + lower) >> 1; + if (middle >= EXT_IRQ_AMOUNT) { + return; + } + + if (ext_irqs[middle].pin == pin) { + if (ext_irqs[middle].cb) { + ext_irqs[middle].cb(); + } + return; + } + + if (ext_irqs[middle].pin < pin) { + lower = middle + 1; + } else { + upper = middle - 1; + } + } +} |