Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/i2c_api.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_NORDIC/TARGET_NRF5_SDK13/i2c_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,784 @@ +/* + * Copyright (c) 2017 Nordic Semiconductor ASA + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA + * integrated circuit in a product or a software update for such product, must reproduce + * the above copyright notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be + * used to endorse or promote products derived from this software without specific prior + * written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary or object form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + + +#include "i2c_api.h" + +#if DEVICE_I2C + +#include "mbed_assert.h" +#include "mbed_error.h" +#include "nrf_twi.h" +#include "nrf_drv_common.h" +#include "sdk_config.h" +#include "app_util_platform.h" +#include "nrf_gpio.h" +#include "nrf_delay.h" + +// An arbitrary value used as the counter in loops waiting for given event +// (e.g. STOPPED), needed to avoid infinite loops (and not involve any timers +// or tickers). +#define TIMEOUT_VALUE 1000 + +#if DEVICE_I2C_ASYNCH + #define TWI_IDX(obj) ((obj)->i2c.twi_idx) +#else + #define TWI_IDX(obj) ((obj)->twi_idx) +#endif +#define TWI_INFO(obj) (&m_twi_info[TWI_IDX(obj)]) + +#define TWI0_INSTANCE_INDEX 0 +#define TWI1_INSTANCE_INDEX TWI0_INSTANCE_INDEX+TWI0_ENABLED + +typedef struct { + bool initialized; + uint32_t pselsda; + uint32_t pselscl; + nrf_twi_frequency_t frequency; + bool start_twi; + +#if DEVICE_I2C_ASYNCH + volatile bool active; + uint8_t const *tx; + size_t tx_length; + uint8_t *rx; + size_t rx_length; + bool stop; + + volatile uint32_t events; + void (*handler)(void); + uint32_t evt_mask; +#endif // DEVICE_I2C_ASYNCH +} twi_info_t; +static twi_info_t m_twi_info[TWI_COUNT]; + +static NRF_TWI_Type * const m_twi_instances[TWI_COUNT] = { +#if TWI0_ENABLED + NRF_TWI0, +#endif +#if TWI1_ENABLED + NRF_TWI1, +#endif +}; + +void SPI0_TWI0_IRQHandler(void); +void SPI1_TWI1_IRQHandler(void); + +static const peripheral_handler_desc_t twi_handlers[TWI_COUNT] = +{ +#if TWI0_ENABLED + { + SPI0_TWI0_IRQn, + (uint32_t) SPI0_TWI0_IRQHandler + }, +#endif +#if TWI1_ENABLED + { + SPI1_TWI1_IRQn, + (uint32_t) SPI1_TWI1_IRQHandler + } +#endif +}; +#ifdef NRF51 + #define TWI_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW +#elif defined(NRF52) || defined(NRF52840_XXAA) + #define TWI_IRQ_PRIORITY APP_IRQ_PRIORITY_LOWEST +#endif + + +#if DEVICE_I2C_ASYNCH +static void start_asynch_rx(twi_info_t *twi_info, NRF_TWI_Type *twi) +{ + if (twi_info->rx_length == 1 && twi_info->stop) + { + nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK); + } + else + { + nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_SUSPEND_MASK); + } + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTRX); +} + +static void twi_irq_handler(uint8_t instance_idx) +{ + twi_info_t *twi_info = &m_twi_info[instance_idx]; + + NRF_TWI_Type *twi = m_twi_instances[instance_idx]; + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + + // In case of an error, force STOP. + // The current transfer may be suspended (if it is RX), so it must be + // resumed before the STOP task is triggered. + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); + + uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi); + twi_info->events |= I2C_EVENT_ERROR; + if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) + { + twi_info->events |= I2C_EVENT_ERROR_NO_SLAVE; + } + if (errorsrc & NRF_TWI_ERROR_DATA_NACK) + { + twi_info->events |= I2C_EVENT_TRANSFER_EARLY_NACK; + } + } + + bool finished = false; + + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_TXDSENT)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); + + MBED_ASSERT(twi_info->tx_length > 0); + --(twi_info->tx_length); + // Send next byte if there is still something to be sent. + if (twi_info->tx_length > 0) + { + nrf_twi_txd_set(twi, *(twi_info->tx)); + ++(twi_info->tx); + // It TX is done, start RX if requested. + } + else if (twi_info->rx_length > 0) + { + start_asynch_rx(twi_info, twi); + // If there is nothing more to do, finalize the transfer. + } + else + { + if (twi_info->stop) + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); + } + else + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND); + finished = true; + } + twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE; + } + } + + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_RXDREADY)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY); + + MBED_ASSERT(twi_info->rx_length > 0); + *(twi_info->rx) = nrf_twi_rxd_get(twi); + ++(twi_info->rx); + --(twi_info->rx_length); + + if (twi_info->rx_length > 0) + { + // If more bytes should be received, resume the transfer + // (in case the stop condition should be generated after the next + // byte, change the shortcuts configuration first). + if (twi_info->rx_length == 1 && twi_info->stop) + { + nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK); + } + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + } + else + { + // If all requested bytes were received, finalize the transfer. + finished = true; + twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE; + } + } + + if (finished || + nrf_twi_event_check(twi, NRF_TWI_EVENT_STOPPED) || + (nrf_twi_int_enable_check(twi, NRF_TWI_INT_SUSPENDED_MASK) && + nrf_twi_event_check(twi, NRF_TWI_EVENT_SUSPENDED))) + { + // There is no need to clear the STOPPED and SUSPENDED events here, + // they will no longer generate the interrupt - see below. + + nrf_twi_shorts_set(twi, 0); + // Disable all interrupt sources. + nrf_twi_int_disable(twi, UINT32_MAX); + twi_info->active = false; + + if (twi_info->handler) + { + twi_info->handler(); + } + } +} + +#if TWI0_ENABLED +static void irq_handler_twi0(void) +{ + twi_irq_handler(TWI0_INSTANCE_INDEX); +} +#endif +#if TWI1_ENABLED +static void irq_handler_twi1(void) +{ + twi_irq_handler(TWI1_INSTANCE_INDEX); +} +#endif +static nrf_drv_irq_handler_t const m_twi_irq_handlers[TWI_COUNT] = +{ +#if TWI0_ENABLED + irq_handler_twi0, +#endif +#if TWI1_ENABLED + irq_handler_twi1, +#endif +}; +#endif // DEVICE_I2C_ASYNCH + + +static void configure_twi_pin(uint32_t pin, nrf_gpio_pin_dir_t dir) +{ + nrf_gpio_cfg(pin, + dir, + NRF_GPIO_PIN_INPUT_CONNECT, + NRF_GPIO_PIN_PULLUP, + NRF_GPIO_PIN_S0D1, + NRF_GPIO_PIN_NOSENSE); +} + +static void twi_clear_bus(twi_info_t *twi_info) +{ + // Try to set SDA high, and check if no slave tries to drive it low. + nrf_gpio_pin_set(twi_info->pselsda); + configure_twi_pin(twi_info->pselsda, NRF_GPIO_PIN_DIR_OUTPUT); + // In case SDA is low, make up to 9 cycles on SCL line to help the slave + // that pulls SDA low release it. + if (!nrf_gpio_pin_read(twi_info->pselsda)) + { + nrf_gpio_pin_set(twi_info->pselscl); + configure_twi_pin(twi_info->pselscl, NRF_GPIO_PIN_DIR_OUTPUT); + nrf_delay_us(4); + + for (int i = 0; i < 9; i++) + { + if (nrf_gpio_pin_read(twi_info->pselsda)) + { + break; + } + nrf_gpio_pin_clear(twi_info->pselscl); + nrf_delay_us(4); + nrf_gpio_pin_set(twi_info->pselscl); + nrf_delay_us(4); + } + + // Finally, generate STOP condition to put the bus into initial state. + nrf_gpio_pin_clear(twi_info->pselsda); + nrf_delay_us(4); + nrf_gpio_pin_set(twi_info->pselsda); + } +} + +void i2c_init(i2c_t *obj, PinName sda, PinName scl) +{ + int i; + + for (i = 0; i < TWI_COUNT; ++i) + { + if (m_twi_info[i].initialized && + m_twi_info[i].pselsda == (uint32_t)sda && + m_twi_info[i].pselscl == (uint32_t)scl) + { + TWI_IDX(obj) = i; + TWI_INFO(obj)->frequency = NRF_TWI_FREQ_100K; + i2c_reset(obj); + return; + } + } + + for (i = 0; i < TWI_COUNT; ++i) + { + if (!m_twi_info[i].initialized) + { + TWI_IDX(obj) = i; + + twi_info_t *twi_info = TWI_INFO(obj); + twi_info->initialized = true; + twi_info->pselsda = (uint32_t)sda; + twi_info->pselscl = (uint32_t)scl; + twi_info->frequency = NRF_TWI_FREQ_100K; + twi_info->start_twi = false; +#if DEVICE_I2C_ASYNCH + twi_info->active = false; +#endif + + twi_clear_bus(twi_info); + + configure_twi_pin(twi_info->pselsda, NRF_GPIO_PIN_DIR_INPUT); + configure_twi_pin(twi_info->pselscl, NRF_GPIO_PIN_DIR_INPUT); + + i2c_reset(obj); + +#if DEVICE_I2C_ASYNCH + nrf_drv_common_per_res_acquire(m_twi_instances[i], + m_twi_irq_handlers[i]); + NVIC_SetVector(twi_handlers[i].IRQn, twi_handlers[i].vector); + nrf_drv_common_irq_enable(twi_handlers[i].IRQn, TWI_IRQ_PRIORITY); +#endif + + return; + } + } + + error("No available I2C peripheral\r\n"); +} + +void i2c_reset(i2c_t *obj) +{ + twi_info_t *twi_info = TWI_INFO(obj); + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + + nrf_twi_disable(twi); + nrf_twi_pins_set(twi, twi_info->pselscl, twi_info->pselsda); + nrf_twi_frequency_set(twi, twi_info->frequency); + nrf_twi_enable(twi); +} + +int i2c_start(i2c_t *obj) +{ + twi_info_t *twi_info = TWI_INFO(obj); +#if DEVICE_I2C_ASYNCH + if (twi_info->active) + { + return I2C_ERROR_BUS_BUSY; + } +#endif + twi_info->start_twi = true; + + return 0; +} + +int i2c_stop(i2c_t *obj) +{ + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + + // The current transfer may be suspended (if it is RX), so it must be + // resumed before the STOP task is triggered. + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); + uint32_t remaining_time = TIMEOUT_VALUE; + + do + { + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_STOPPED)) + { + return 0; + } + } + while (--remaining_time); + + return 1; +} + +void i2c_frequency(i2c_t *obj, int hz) +{ + twi_info_t *twi_info = TWI_INFO(obj); + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + + if (hz < 250000) + { + twi_info->frequency = NRF_TWI_FREQ_100K; + } + else if (hz < 400000) + { + twi_info->frequency = NRF_TWI_FREQ_250K; + } + else + { + twi_info->frequency = NRF_TWI_FREQ_400K; + } + nrf_twi_frequency_set(twi, twi_info->frequency); +} + +static uint8_t twi_address(int i2c_address) +{ + // The TWI peripheral requires 7-bit slave address (without R/W bit). + return (i2c_address >> 1); +} + +static void start_twi_read(NRF_TWI_Type *twi, int address) +{ + nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + (void)nrf_twi_errorsrc_get_and_clear(twi); + + nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_SUSPEND_MASK); + + nrf_twi_address_set(twi, twi_address(address)); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTRX); +} + +int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) +{ + // Zero-length RX transfers are not supported. Such transfers cannot + // be easily achieved with TWI peripheral (some dirty tricks would be + // required for this), and they are actually useless (TX can be used + // to check if the address is acknowledged by a slave). + MBED_ASSERT(length > 0); + + twi_info_t *twi_info = TWI_INFO(obj); +#if DEVICE_I2C_ASYNCH + if (twi_info->active) + { + return I2C_ERROR_BUS_BUSY; + } +#endif + twi_info->start_twi = false; + + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + start_twi_read(twi, address); + + int result = length; + + while (length > 0) + { + int byte_read_result = i2c_byte_read(obj, (stop && length == 1)); + if (byte_read_result < 0) + { + // When an error occurs, return the number of bytes that have been + // received successfully. + result -= length; + // Force STOP condition. + stop = 1; + break; + } + *data++ = (uint8_t)byte_read_result; + --length; + } + + if (stop) + { + (void)i2c_stop(obj); + } + + return result; +} + +static uint8_t twi_byte_write(NRF_TWI_Type *twi, uint8_t data) +{ + nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + + nrf_twi_txd_set(twi, data); + uint32_t remaining_time = TIMEOUT_VALUE; + + do + { + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_TXDSENT)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); + return 1; // ACK received + } + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + return 0; // some error occurred + } + } + while (--remaining_time); + + return 2; // timeout; +} + +static void start_twi_write(NRF_TWI_Type *twi, int address) +{ + nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + (void)nrf_twi_errorsrc_get_and_clear(twi); + + nrf_twi_shorts_set(twi, 0); + + nrf_twi_address_set(twi, twi_address(address)); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX); +} + +int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) +{ + twi_info_t *twi_info = TWI_INFO(obj); +#if DEVICE_I2C_ASYNCH + if (twi_info->active) + { + return I2C_ERROR_BUS_BUSY; + } +#endif + twi_info->start_twi = false; + + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + start_twi_write(twi, address); + + // Special case - transaction with no data. + // It can be used to check if a slave acknowledges the address. + if (length == 0) + { + nrf_twi_event_t event; + if (stop) + { + event = NRF_TWI_EVENT_STOPPED; + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); + } + else + { + event = NRF_TWI_EVENT_SUSPENDED; + nrf_twi_event_clear(twi, event); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND); + } + uint32_t remaining_time = TIMEOUT_VALUE; + + do + { + if (nrf_twi_event_check(twi, event)) + { + break; + } + } + while (--remaining_time); + + uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi); + if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) + { + if (!stop) + { + i2c_stop(obj); + } + return I2C_ERROR_NO_SLAVE; + } + + return (remaining_time ? 0 : I2C_ERROR_BUS_BUSY); + } + + int result = length; + + do + { + uint8_t byte_write_result = twi_byte_write(twi, (uint8_t)*data++); + if (byte_write_result != 1) + { + if (byte_write_result == 0) + { + // Check what kind of error has been signaled by TWI. + uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi); + if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) + { + result = I2C_ERROR_NO_SLAVE; + } + else + { + // Some other error - return the number of bytes that + // have been sent successfully. + result -= length; + } + } + else + { + result = I2C_ERROR_BUS_BUSY; + } + // Force STOP condition. + stop = 1; + break; + } + --length; + } + while (length > 0); + + if (stop) + { + (void)i2c_stop(obj); + } + + return result; +} + +int i2c_byte_read(i2c_t *obj, int last) +{ + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + + if (last) + { + nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK); + } + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + + uint32_t remaining_time = TIMEOUT_VALUE; + + do + { + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_RXDREADY)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY); + return nrf_twi_rxd_get(twi); + } + if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) + { + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + return I2C_ERROR_NO_SLAVE; + } + } + while (--remaining_time); + + return I2C_ERROR_BUS_BUSY; +} + +int i2c_byte_write(i2c_t *obj, int data) +{ + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + twi_info_t *twi_info = TWI_INFO(obj); + if (twi_info->start_twi) + { + twi_info->start_twi = false; + + if (data & 1) + { + start_twi_read(twi, data); + } + else + { + start_twi_write(twi, data); + } + return 1; + } + else + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + // 0 - TWI signaled error (NAK is the only possibility here) + // 1 - ACK received + // 2 - timeout (clock stretched for too long?) + return twi_byte_write(twi, (uint8_t)data); + } +} + + +#if DEVICE_I2C_ASYNCH +void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, + void *rx, size_t rx_length, uint32_t address, + uint32_t stop, uint32_t handler, + uint32_t event, DMAUsage hint) +{ + (void)hint; + + twi_info_t *twi_info = TWI_INFO(obj); + if (twi_info->active) + { + return; + } + twi_info->active = true; + twi_info->events = 0; + twi_info->handler = (void (*)(void))handler; + twi_info->evt_mask = event; + twi_info->tx_length = tx_length; + twi_info->tx = tx; + twi_info->rx_length = rx_length; + twi_info->rx = rx; + twi_info->stop = stop; + + NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; + + nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_SUSPENDED); + nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); + (void)nrf_twi_errorsrc_get_and_clear(twi); + + nrf_twi_address_set(twi, twi_address(address)); + nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); + // TX only, or TX + RX (after a repeated start). + if (tx_length > 0) + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX); + nrf_twi_txd_set(twi, *(twi_info->tx)); + ++(twi_info->tx); + // RX only. + } + else if (rx_length > 0) + { + start_asynch_rx(twi_info, twi); + // Both 'tx_length' and 'rx_length' are 0 - this case may be used + // to test if the slave is presentand ready for transfer (by just + // sending the address and checking if it is acknowledged). + } + else + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX); + if (stop) + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); + } + else + { + nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND); + nrf_twi_int_enable(twi, NRF_TWI_INT_SUSPENDED_MASK); + } + twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE; + } + + nrf_twi_int_enable(twi, NRF_TWI_INT_TXDSENT_MASK | + NRF_TWI_INT_RXDREADY_MASK | + NRF_TWI_INT_STOPPED_MASK | + NRF_TWI_INT_ERROR_MASK); +} + +uint32_t i2c_irq_handler_asynch(i2c_t *obj) +{ + twi_info_t *twi_info = TWI_INFO(obj); + return (twi_info->events & twi_info->evt_mask); +} + +uint8_t i2c_active(i2c_t *obj) +{ + twi_info_t *twi_info = TWI_INFO(obj); + return twi_info->active; +} + +void i2c_abort_asynch(i2c_t *obj) +{ + i2c_reset(obj); +} +#endif // DEVICE_I2C_ASYNCH + +#endif // DEVICE_I2C