mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_NORDIC/TARGET_NRF5/i2c_api.c@150:02e0a0aed4ec, 2016-11-08 (annotated)

Committer:
<>
Date:
Tue Nov 08 17:45:16 2016 +0000
Revision:
150:02e0a0aed4ec
Parent:
149:156823d33999
Child:
160:d5399cc887bb
This updates the lib to the mbed lib v129

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2013 Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without modification,
<> 144:ef7eb2e8f9f7 6 * are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * 1. Redistributions of source code must retain the above copyright notice, this list
<> 144:ef7eb2e8f9f7 9 * of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 12 * integrated circuit in a product or a software update for such product, must reproduce
<> 144:ef7eb2e8f9f7 13 * the above copyright notice, this list of conditions and the following disclaimer in
<> 144:ef7eb2e8f9f7 14 * the documentation and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
<> 144:ef7eb2e8f9f7 17 * used to endorse or promote products derived from this software without specific prior
<> 144:ef7eb2e8f9f7 18 * written permission.
<> 144:ef7eb2e8f9f7 19 *
<> 144:ef7eb2e8f9f7 20 * 4. This software, with or without modification, must only be used with a
<> 144:ef7eb2e8f9f7 21 * Nordic Semiconductor ASA integrated circuit.
<> 144:ef7eb2e8f9f7 22 *
<> 144:ef7eb2e8f9f7 23 * 5. Any software provided in binary or object form under this license must not be reverse
<> 144:ef7eb2e8f9f7 24 * engineered, decompiled, modified and/or disassembled.
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
<> 144:ef7eb2e8f9f7 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
<> 144:ef7eb2e8f9f7 28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 29 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
<> 144:ef7eb2e8f9f7 30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
<> 144:ef7eb2e8f9f7 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
<> 144:ef7eb2e8f9f7 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
<> 144:ef7eb2e8f9f7 33 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
<> 144:ef7eb2e8f9f7 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
<> 144:ef7eb2e8f9f7 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 36 *
<> 144:ef7eb2e8f9f7 37 */
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 #include "i2c_api.h"
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 #if DEVICE_I2C
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 45 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 46 #include "nrf_drv_twi.h"
<> 144:ef7eb2e8f9f7 47 #include "app_util_platform.h"
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 50 #define TWI_IDX(obj) ((obj)->i2c.twi_idx)
<> 144:ef7eb2e8f9f7 51 #else
<> 144:ef7eb2e8f9f7 52 #define TWI_IDX(obj) ((obj)->twi_idx)
<> 144:ef7eb2e8f9f7 53 #endif
<> 144:ef7eb2e8f9f7 54 #define TWI_INFO(obj) (&m_twi_info[TWI_IDX(obj)])
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 typedef struct {
<> 144:ef7eb2e8f9f7 57 bool initialized;
<> 144:ef7eb2e8f9f7 58 nrf_drv_twi_config_t config;
<> 144:ef7eb2e8f9f7 59 volatile bool transfer_finished;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 62 volatile uint32_t events;
<> 144:ef7eb2e8f9f7 63 void (*handler)(void);
<> 144:ef7eb2e8f9f7 64 uint32_t event_mask;
<> 144:ef7eb2e8f9f7 65 #endif
<> 144:ef7eb2e8f9f7 66 } twi_info_t;
<> 144:ef7eb2e8f9f7 67 static twi_info_t m_twi_info[TWI_COUNT];
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 static nrf_drv_twi_t const m_twi_instances[TWI_COUNT] = {
<> 144:ef7eb2e8f9f7 70 #if TWI0_ENABLED
<> 144:ef7eb2e8f9f7 71 NRF_DRV_TWI_INSTANCE(0),
<> 144:ef7eb2e8f9f7 72 #endif
<> 144:ef7eb2e8f9f7 73 #if TWI1_ENABLED
<> 144:ef7eb2e8f9f7 74 NRF_DRV_TWI_INSTANCE(1),
<> 144:ef7eb2e8f9f7 75 #endif
<> 144:ef7eb2e8f9f7 76 };
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 static void twi_event_handler(nrf_drv_twi_evt_t const *event, void *context)
<> 144:ef7eb2e8f9f7 79 {
<> 144:ef7eb2e8f9f7 80 twi_info_t * twi_info = TWI_INFO((i2c_t *)context);
<> 144:ef7eb2e8f9f7 81 twi_info->transfer_finished = true;
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 84 switch (event->type) {
<> 144:ef7eb2e8f9f7 85 case NRF_DRV_TWI_EVT_DONE:
<> 144:ef7eb2e8f9f7 86 twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE;
<> 144:ef7eb2e8f9f7 87 break;
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 case NRF_DRV_TWI_EVT_ADDRESS_NACK:
<> 144:ef7eb2e8f9f7 90 twi_info->events |= I2C_EVENT_ERROR_NO_SLAVE;
<> 144:ef7eb2e8f9f7 91 break;
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 case NRF_DRV_TWI_EVT_DATA_NACK:
<> 144:ef7eb2e8f9f7 94 twi_info->events |= I2C_EVENT_ERROR;
<> 144:ef7eb2e8f9f7 95 break;
<> 144:ef7eb2e8f9f7 96 }
<> 144:ef7eb2e8f9f7 97
<> 144:ef7eb2e8f9f7 98 if (twi_info->handler) {
<> 144:ef7eb2e8f9f7 99 twi_info->handler();
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101 #endif // DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 102 }
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 static uint8_t twi_address(int i2c_address)
<> 144:ef7eb2e8f9f7 105 {
<> 144:ef7eb2e8f9f7 106 // The TWI driver requires 7-bit slave address (without R/W bit).
<> 144:ef7eb2e8f9f7 107 return (i2c_address >> 1);
<> 144:ef7eb2e8f9f7 108 }
<> 144:ef7eb2e8f9f7 109
<> 150:02e0a0aed4ec 110 void SPI0_TWI0_IRQHandler(void);
<> 150:02e0a0aed4ec 111 void SPI1_TWI1_IRQHandler(void);
<> 150:02e0a0aed4ec 112
<> 150:02e0a0aed4ec 113 static const peripheral_handler_desc_t twi_handlers[TWI_COUNT] =
<> 150:02e0a0aed4ec 114 {
<> 150:02e0a0aed4ec 115 #if TWI0_ENABLED
<> 150:02e0a0aed4ec 116 {
<> 150:02e0a0aed4ec 117 SPI0_TWI0_IRQn,
<> 150:02e0a0aed4ec 118 (uint32_t) SPI0_TWI0_IRQHandler
<> 150:02e0a0aed4ec 119 },
<> 150:02e0a0aed4ec 120 #endif
<> 150:02e0a0aed4ec 121 #if TWI1_ENABLED
<> 150:02e0a0aed4ec 122 {
<> 150:02e0a0aed4ec 123 SPI1_TWI1_IRQn,
<> 150:02e0a0aed4ec 124 (uint32_t) SPI1_TWI1_IRQHandler
<> 150:02e0a0aed4ec 125 }
<> 150:02e0a0aed4ec 126 #endif
<> 150:02e0a0aed4ec 127 };
<> 150:02e0a0aed4ec 128
<> 144:ef7eb2e8f9f7 129 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 144:ef7eb2e8f9f7 130 {
<> 144:ef7eb2e8f9f7 131 int i;
<> 144:ef7eb2e8f9f7 132 for (i = 0; i < TWI_COUNT; ++i) {
<> 144:ef7eb2e8f9f7 133 if (m_twi_info[i].initialized &&
<> 144:ef7eb2e8f9f7 134 m_twi_info[i].config.sda == (uint32_t)sda &&
<> 144:ef7eb2e8f9f7 135 m_twi_info[i].config.scl == (uint32_t)scl) {
<> 144:ef7eb2e8f9f7 136 TWI_IDX(obj) = i;
<> 144:ef7eb2e8f9f7 137 TWI_INFO(obj)->config.frequency = NRF_TWI_FREQ_100K;
<> 144:ef7eb2e8f9f7 138 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 139 return;
<> 144:ef7eb2e8f9f7 140 }
<> 144:ef7eb2e8f9f7 141 }
<> 144:ef7eb2e8f9f7 142
<> 144:ef7eb2e8f9f7 143 nrf_drv_twi_config_t const config = {
<> 144:ef7eb2e8f9f7 144 .scl = scl,
<> 144:ef7eb2e8f9f7 145 .sda = sda,
<> 150:02e0a0aed4ec 146 .frequency = NRF_TWI_FREQ_100K,
<> 150:02e0a0aed4ec 147 #ifdef NRF51
<> 150:02e0a0aed4ec 148 .interrupt_priority = APP_IRQ_PRIORITY_LOW
<> 150:02e0a0aed4ec 149 #elif defined(NRF52)
<> 150:02e0a0aed4ec 150 .interrupt_priority = APP_IRQ_PRIORITY_LOWEST
<> 150:02e0a0aed4ec 151 #endif
<> 150:02e0a0aed4ec 152
<> 144:ef7eb2e8f9f7 153 };
<> 144:ef7eb2e8f9f7 154
<> 144:ef7eb2e8f9f7 155 for (i = 0; i < TWI_COUNT; ++i) {
<> 144:ef7eb2e8f9f7 156 if (!m_twi_info[i].initialized) {
<> 150:02e0a0aed4ec 157
<> 150:02e0a0aed4ec 158 NVIC_SetVector(twi_handlers[i].IRQn, twi_handlers[i].vector);
<> 150:02e0a0aed4ec 159
<> 144:ef7eb2e8f9f7 160 nrf_drv_twi_t const *twi = &m_twi_instances[i];
<> 144:ef7eb2e8f9f7 161 ret_code_t ret_code =
<> 144:ef7eb2e8f9f7 162 nrf_drv_twi_init(twi, &config, twi_event_handler, obj);
<> 144:ef7eb2e8f9f7 163 if (ret_code == NRF_SUCCESS) {
<> 144:ef7eb2e8f9f7 164 TWI_IDX(obj) = i;
<> 144:ef7eb2e8f9f7 165 TWI_INFO(obj)->initialized = true;
<> 144:ef7eb2e8f9f7 166 TWI_INFO(obj)->config = config;
<> 144:ef7eb2e8f9f7 167
<> 144:ef7eb2e8f9f7 168 nrf_drv_twi_enable(twi);
<> 144:ef7eb2e8f9f7 169 return;
<> 144:ef7eb2e8f9f7 170 }
<> 144:ef7eb2e8f9f7 171 }
<> 144:ef7eb2e8f9f7 172 }
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 // No available peripheral
<> 144:ef7eb2e8f9f7 175 error("No available I2C peripheral\r\n");
<> 144:ef7eb2e8f9f7 176 }
<> 144:ef7eb2e8f9f7 177
<> 144:ef7eb2e8f9f7 178 void i2c_reset(i2c_t *obj)
<> 144:ef7eb2e8f9f7 179 {
<> 144:ef7eb2e8f9f7 180 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 181 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 182
<> 144:ef7eb2e8f9f7 183 nrf_drv_twi_uninit(twi);
<> 144:ef7eb2e8f9f7 184 nrf_drv_twi_init(twi, &twi_info->config, twi_event_handler, obj);
<> 144:ef7eb2e8f9f7 185 nrf_drv_twi_enable(twi);
<> 144:ef7eb2e8f9f7 186 }
<> 144:ef7eb2e8f9f7 187
<> 144:ef7eb2e8f9f7 188 int i2c_start(i2c_t *obj)
<> 144:ef7eb2e8f9f7 189 {
<> 144:ef7eb2e8f9f7 190 (void)obj;
<> 144:ef7eb2e8f9f7 191
<> 144:ef7eb2e8f9f7 192 return -1; // Not implemented.
<> 144:ef7eb2e8f9f7 193 }
<> 144:ef7eb2e8f9f7 194
<> 144:ef7eb2e8f9f7 195 int i2c_stop(i2c_t *obj)
<> 144:ef7eb2e8f9f7 196 {
<> 144:ef7eb2e8f9f7 197 (void)obj;
<> 144:ef7eb2e8f9f7 198
<> 144:ef7eb2e8f9f7 199 return -1; // Not implemented.
<> 144:ef7eb2e8f9f7 200 }
<> 144:ef7eb2e8f9f7 201
<> 144:ef7eb2e8f9f7 202 void i2c_frequency(i2c_t *obj, int hz)
<> 144:ef7eb2e8f9f7 203 {
<> 144:ef7eb2e8f9f7 204 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 205 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 206
<> 144:ef7eb2e8f9f7 207 if (hz < 250000) {
<> 144:ef7eb2e8f9f7 208 twi_info->config.frequency = NRF_TWI_FREQ_100K;
<> 144:ef7eb2e8f9f7 209 } else if (hz < 400000) {
<> 144:ef7eb2e8f9f7 210 twi_info->config.frequency = NRF_TWI_FREQ_250K;
<> 144:ef7eb2e8f9f7 211 } else {
<> 144:ef7eb2e8f9f7 212 twi_info->config.frequency = NRF_TWI_FREQ_400K;
<> 144:ef7eb2e8f9f7 213 }
<> 144:ef7eb2e8f9f7 214 nrf_twi_frequency_set(twi->reg.p_twi, twi_info->config.frequency);
<> 144:ef7eb2e8f9f7 215 }
<> 144:ef7eb2e8f9f7 216
<> 144:ef7eb2e8f9f7 217 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 218 {
<> 144:ef7eb2e8f9f7 219 (void)stop;
<> 144:ef7eb2e8f9f7 220
<> 144:ef7eb2e8f9f7 221 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 222 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 223
<> 144:ef7eb2e8f9f7 224 twi_info->transfer_finished = false;
<> 144:ef7eb2e8f9f7 225 ret_code_t ret_code = nrf_drv_twi_rx(twi, twi_address(address),
<> 144:ef7eb2e8f9f7 226 (uint8_t *)data, length);
<> 144:ef7eb2e8f9f7 227 if (ret_code != NRF_SUCCESS) {
<> 144:ef7eb2e8f9f7 228 return 0;
<> 144:ef7eb2e8f9f7 229 }
<> 144:ef7eb2e8f9f7 230 while (!twi_info->transfer_finished) {}
<> 144:ef7eb2e8f9f7 231 return nrf_drv_twi_data_count_get(twi);
<> 144:ef7eb2e8f9f7 232 }
<> 144:ef7eb2e8f9f7 233
<> 144:ef7eb2e8f9f7 234 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 235 {
<> 144:ef7eb2e8f9f7 236 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 237 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 238
<> 144:ef7eb2e8f9f7 239 twi_info->transfer_finished = false;
<> 144:ef7eb2e8f9f7 240 ret_code_t ret_code = nrf_drv_twi_tx(twi, twi_address(address),
<> 144:ef7eb2e8f9f7 241 (uint8_t const *)data, length, (stop == 0));
<> 144:ef7eb2e8f9f7 242 if (ret_code != NRF_SUCCESS) {
<> 144:ef7eb2e8f9f7 243 return 0;
<> 144:ef7eb2e8f9f7 244 }
<> 144:ef7eb2e8f9f7 245 while (!twi_info->transfer_finished) {}
<> 144:ef7eb2e8f9f7 246 return nrf_drv_twi_data_count_get(twi);
<> 144:ef7eb2e8f9f7 247 }
<> 144:ef7eb2e8f9f7 248
<> 144:ef7eb2e8f9f7 249 int i2c_byte_read(i2c_t *obj, int last)
<> 144:ef7eb2e8f9f7 250 {
<> 144:ef7eb2e8f9f7 251 (void)obj;
<> 144:ef7eb2e8f9f7 252 (void)last;
<> 144:ef7eb2e8f9f7 253
<> 144:ef7eb2e8f9f7 254 return -1; // Not implemented.
<> 144:ef7eb2e8f9f7 255 }
<> 144:ef7eb2e8f9f7 256
<> 144:ef7eb2e8f9f7 257 int i2c_byte_write(i2c_t *obj, int data)
<> 144:ef7eb2e8f9f7 258 {
<> 144:ef7eb2e8f9f7 259 (void)obj;
<> 144:ef7eb2e8f9f7 260 (void)data;
<> 144:ef7eb2e8f9f7 261
<> 144:ef7eb2e8f9f7 262 return -1; // Not implemented.
<> 144:ef7eb2e8f9f7 263 }
<> 144:ef7eb2e8f9f7 264
<> 144:ef7eb2e8f9f7 265
<> 144:ef7eb2e8f9f7 266 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 267
<> 144:ef7eb2e8f9f7 268 void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length,
<> 144:ef7eb2e8f9f7 269 void *rx, size_t rx_length, uint32_t address,
<> 144:ef7eb2e8f9f7 270 uint32_t stop, uint32_t handler,
<> 144:ef7eb2e8f9f7 271 uint32_t event, DMAUsage hint)
<> 144:ef7eb2e8f9f7 272 {
<> 144:ef7eb2e8f9f7 273 (void)stop;
<> 144:ef7eb2e8f9f7 274 (void)hint;
<> 144:ef7eb2e8f9f7 275
<> 144:ef7eb2e8f9f7 276 if (i2c_active(obj)) {
<> 144:ef7eb2e8f9f7 277 return;
<> 144:ef7eb2e8f9f7 278 }
<> 144:ef7eb2e8f9f7 279 if ((tx_length == 0) && (rx_length == 0)) {
<> 144:ef7eb2e8f9f7 280 return;
<> 144:ef7eb2e8f9f7 281 }
<> 144:ef7eb2e8f9f7 282
<> 144:ef7eb2e8f9f7 283 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 284 twi_info->events = 0;
<> 144:ef7eb2e8f9f7 285 twi_info->handler = (void (*)(void))handler;
<> 144:ef7eb2e8f9f7 286 twi_info->event_mask = event;
<> 144:ef7eb2e8f9f7 287
<> 144:ef7eb2e8f9f7 288 uint8_t twi_addr = twi_address(address);
<> 144:ef7eb2e8f9f7 289 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 290
<> 144:ef7eb2e8f9f7 291 if ((tx_length > 0) && (rx_length == 0)) {
<> 144:ef7eb2e8f9f7 292 nrf_drv_twi_xfer_desc_t const xfer =
<> 144:ef7eb2e8f9f7 293 NRF_DRV_TWI_XFER_DESC_TX(twi_addr, (uint8_t *)tx, tx_length);
<> 144:ef7eb2e8f9f7 294 nrf_drv_twi_xfer(twi, &xfer,
<> 144:ef7eb2e8f9f7 295 stop ? 0 : NRF_DRV_TWI_FLAG_TX_NO_STOP);
<> 144:ef7eb2e8f9f7 296 }
<> 144:ef7eb2e8f9f7 297 else if ((tx_length == 0) && (rx_length > 0)) {
<> 144:ef7eb2e8f9f7 298 nrf_drv_twi_xfer_desc_t const xfer =
<> 144:ef7eb2e8f9f7 299 NRF_DRV_TWI_XFER_DESC_RX(twi_addr, rx, rx_length);
<> 144:ef7eb2e8f9f7 300 nrf_drv_twi_xfer(twi, &xfer, 0);
<> 144:ef7eb2e8f9f7 301 }
<> 144:ef7eb2e8f9f7 302 else if ((tx_length > 0) && (rx_length > 0)) {
<> 144:ef7eb2e8f9f7 303 nrf_drv_twi_xfer_desc_t const xfer =
<> 144:ef7eb2e8f9f7 304 NRF_DRV_TWI_XFER_DESC_TXRX(twi_addr,
<> 144:ef7eb2e8f9f7 305 (uint8_t *)tx, tx_length, rx, rx_length);
<> 144:ef7eb2e8f9f7 306 nrf_drv_twi_xfer(twi, &xfer, 0);
<> 144:ef7eb2e8f9f7 307 }
<> 144:ef7eb2e8f9f7 308 }
<> 144:ef7eb2e8f9f7 309
<> 144:ef7eb2e8f9f7 310 uint32_t i2c_irq_handler_asynch(i2c_t *obj)
<> 144:ef7eb2e8f9f7 311 {
<> 144:ef7eb2e8f9f7 312 twi_info_t *twi_info = TWI_INFO(obj);
<> 144:ef7eb2e8f9f7 313 return (twi_info->events & twi_info->event_mask);
<> 144:ef7eb2e8f9f7 314 }
<> 144:ef7eb2e8f9f7 315
<> 144:ef7eb2e8f9f7 316 uint8_t i2c_active(i2c_t *obj)
<> 144:ef7eb2e8f9f7 317 {
<> 144:ef7eb2e8f9f7 318 nrf_drv_twi_t const *twi = &m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 319 return nrf_drv_twi_is_busy(twi);
<> 144:ef7eb2e8f9f7 320 }
<> 144:ef7eb2e8f9f7 321
<> 144:ef7eb2e8f9f7 322 void i2c_abort_asynch(i2c_t *obj)
<> 144:ef7eb2e8f9f7 323 {
<> 144:ef7eb2e8f9f7 324 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 325 }
<> 144:ef7eb2e8f9f7 326
<> 144:ef7eb2e8f9f7 327 #endif // DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 328
<> 144:ef7eb2e8f9f7 329 #endif // DEVICE_I2C