Cortney Padua / capstone_i2c

initial code for i2c communication with accelerometers

Dependencies:   BLE_API mbed-dev nRF51822

Fork of capstone_i2c by Zachary Newman

wire.cpp@5:a52a03b6d13b, 2017-04-11 (annotated)

Committer:
cpadua
Date:
Tue Apr 11 20:39:41 2017 +0000
Revision:
5:a52a03b6d13b
Parent:
2:2082f0f50590 
fixed i2c-api.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
znew711 0:6a249a5be3a4 1
znew711 0:6a249a5be3a4 2 /*
znew711 0:6a249a5be3a4 3
znew711 0:6a249a5be3a4 4 Copyright (c) 2014 RedBearLab, All rights reserved.
znew711 0:6a249a5be3a4 5
znew711 0:6a249a5be3a4 6 This library is free software; you can redistribute it and/or
znew711 0:6a249a5be3a4 7 modify it under the terms of the GNU Lesser General Public
znew711 0:6a249a5be3a4 8 License as published by the Free Software Foundation; either
znew711 0:6a249a5be3a4 9 version 2.1 of the License, or (at your option) any later version.
znew711 0:6a249a5be3a4 10
znew711 0:6a249a5be3a4 11 This library is distributed in the hope that it will be useful,
znew711 0:6a249a5be3a4 12 but WITHOUT ANY WARRANTY; without even the implied warranty of
znew711 0:6a249a5be3a4 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
znew711 0:6a249a5be3a4 14 See the GNU Lesser General Public License for more details.
znew711 0:6a249a5be3a4 15
znew711 0:6a249a5be3a4 16 You should have received a copy of the GNU Lesser General Public
znew711 0:6a249a5be3a4 17 License along with this library; if not, write to the Free Software
znew711 0:6a249a5be3a4 18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
znew711 0:6a249a5be3a4 19
znew711 0:6a249a5be3a4 20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
znew711 0:6a249a5be3a4 21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
znew711 0:6a249a5be3a4 22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
znew711 0:6a249a5be3a4 23 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
znew711 0:6a249a5be3a4 24 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
znew711 0:6a249a5be3a4 25 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
znew711 0:6a249a5be3a4 26 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
znew711 0:6a249a5be3a4 27
znew711 0:6a249a5be3a4 28 */
znew711 0:6a249a5be3a4 29
znew711 0:6a249a5be3a4 30 #include "wire.h"
znew711 0:6a249a5be3a4 31 #include "nrf_soc.h"
znew711 0:6a249a5be3a4 32 #include "nrf_sdm.h"
znew711 0:6a249a5be3a4 33
znew711 0:6a249a5be3a4 34 //extern Serial pc;
znew711 0:6a249a5be3a4 35 /**********************************************************************
znew711 0:6a249a5be3a4 36 name :
znew711 0:6a249a5be3a4 37 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 38 **********************************************************************/
znew711 0:6a249a5be3a4 39 bool TwoWire::twi_master_clear_bus(void)
znew711 0:6a249a5be3a4 40 {
znew711 0:6a249a5be3a4 41 bool bus_clear;
znew711 0:6a249a5be3a4 42 uint32_t twi_state;
znew711 0:6a249a5be3a4 43 uint32_t sck_pin_config;
znew711 0:6a249a5be3a4 44 uint32_t sda_pin_config;
znew711 0:6a249a5be3a4 45
znew711 0:6a249a5be3a4 46 twi_state = twi->ENABLE;
znew711 0:6a249a5be3a4 47 twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 48
znew711 0:6a249a5be3a4 49 sck_pin_config = NRF_GPIO->PIN_CNF[SCL_Pin];
znew711 0:6a249a5be3a4 50 NRF_GPIO->PIN_CNF[SCL_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
cpadua 2:2082f0f50590 51 | (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos)
znew711 0:6a249a5be3a4 52 | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
znew711 0:6a249a5be3a4 53 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
znew711 0:6a249a5be3a4 54 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
znew711 0:6a249a5be3a4 55
znew711 0:6a249a5be3a4 56 sda_pin_config = NRF_GPIO->PIN_CNF[SDA_Pin];
znew711 0:6a249a5be3a4 57 NRF_GPIO->PIN_CNF[SDA_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
cpadua 2:2082f0f50590 58 | (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos)
znew711 0:6a249a5be3a4 59 | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
znew711 0:6a249a5be3a4 60 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
znew711 0:6a249a5be3a4 61 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
znew711 0:6a249a5be3a4 62
znew711 0:6a249a5be3a4 63 NRF_GPIO->OUTSET = ( 1 << SCL_Pin );
znew711 0:6a249a5be3a4 64 NRF_GPIO->OUTSET = ( 1 << SDA_Pin );
znew711 0:6a249a5be3a4 65 TWI_DELAY(4);
znew711 0:6a249a5be3a4 66
znew711 0:6a249a5be3a4 67 if( ( (NRF_GPIO->IN >> SCL_Pin) & 0X1UL ) && ( (NRF_GPIO->IN >> SDA_Pin) & 0x1UL ) )
znew711 0:6a249a5be3a4 68 {
znew711 0:6a249a5be3a4 69 bus_clear = 0;
znew711 0:6a249a5be3a4 70 }
znew711 0:6a249a5be3a4 71 else
znew711 0:6a249a5be3a4 72 {
znew711 0:6a249a5be3a4 73 uint_fast8_t index;
znew711 0:6a249a5be3a4 74 bus_clear = 1;
znew711 0:6a249a5be3a4 75 for( index=18; index--;)
znew711 0:6a249a5be3a4 76 {
znew711 0:6a249a5be3a4 77 NRF_GPIO->OUTCLR = ( 1 << SCL_Pin );
znew711 0:6a249a5be3a4 78 TWI_DELAY(4);
znew711 0:6a249a5be3a4 79 NRF_GPIO->OUTSET = ( 1 << SDA_Pin );
znew711 0:6a249a5be3a4 80 TWI_DELAY(4);
znew711 0:6a249a5be3a4 81
znew711 0:6a249a5be3a4 82 if( (NRF_GPIO->IN >> SDA_Pin) & 0x1UL == 1 )
znew711 0:6a249a5be3a4 83 {
znew711 0:6a249a5be3a4 84 bus_clear = 0;
znew711 0:6a249a5be3a4 85 break;
znew711 0:6a249a5be3a4 86 }
znew711 0:6a249a5be3a4 87 }
znew711 0:6a249a5be3a4 88 }
znew711 0:6a249a5be3a4 89
znew711 0:6a249a5be3a4 90 NRF_GPIO->PIN_CNF[SCL_Pin] = sck_pin_config;
znew711 0:6a249a5be3a4 91 NRF_GPIO->PIN_CNF[SDA_Pin] = sda_pin_config;
znew711 0:6a249a5be3a4 92
znew711 0:6a249a5be3a4 93 twi->ENABLE = twi_state;
znew711 0:6a249a5be3a4 94
znew711 0:6a249a5be3a4 95 return bus_clear;
znew711 0:6a249a5be3a4 96 }
znew711 0:6a249a5be3a4 97
znew711 0:6a249a5be3a4 98 /**********************************************************************
znew711 0:6a249a5be3a4 99 name :
znew711 0:6a249a5be3a4 100 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 101 **********************************************************************/
znew711 0:6a249a5be3a4 102 bool TwoWire::twi_master_init(void)
znew711 0:6a249a5be3a4 103 {
znew711 0:6a249a5be3a4 104 uint8_t softdevice_enabled;
znew711 0:6a249a5be3a4 105 //uint32_t err_code = NRF_SUCCESS;
znew711 0:6a249a5be3a4 106
znew711 0:6a249a5be3a4 107 NRF_GPIO->PIN_CNF[SCL_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
cpadua 2:2082f0f50590 108 | (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos)
znew711 0:6a249a5be3a4 109 | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
znew711 0:6a249a5be3a4 110 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
znew711 0:6a249a5be3a4 111 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
znew711 0:6a249a5be3a4 112
znew711 0:6a249a5be3a4 113 NRF_GPIO->PIN_CNF[SDA_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
cpadua 2:2082f0f50590 114 | (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos)
znew711 0:6a249a5be3a4 115 | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)
znew711 0:6a249a5be3a4 116 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
znew711 0:6a249a5be3a4 117 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
znew711 0:6a249a5be3a4 118
znew711 0:6a249a5be3a4 119 twi->EVENTS_RXDREADY = 0;
znew711 0:6a249a5be3a4 120 twi->EVENTS_TXDSENT = 0;
znew711 0:6a249a5be3a4 121 twi->PSELSCL = SCL_Pin;
znew711 0:6a249a5be3a4 122 twi->PSELSDA = SDA_Pin;
znew711 0:6a249a5be3a4 123 twi->FREQUENCY = twi_frequency; //TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos;
znew711 0:6a249a5be3a4 124
znew711 0:6a249a5be3a4 125 sd_softdevice_is_enabled(&softdevice_enabled);
znew711 0:6a249a5be3a4 126 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 127 if (softdevice_enabled == 0)
znew711 0:6a249a5be3a4 128 {
znew711 0:6a249a5be3a4 129 NRF_PPI->CH[7].EEP = (uint32_t)&twi->EVENTS_BB;
znew711 0:6a249a5be3a4 130 NRF_PPI->CH[7].TEP = (uint32_t)&twi->TASKS_SUSPEND;
znew711 0:6a249a5be3a4 131 NRF_PPI->CHEN &= ~(1 << 7);
znew711 0:6a249a5be3a4 132 }
znew711 0:6a249a5be3a4 133 else
znew711 0:6a249a5be3a4 134 {
znew711 0:6a249a5be3a4 135 sd_ppi_channel_assign(7, &twi->EVENTS_BB, &twi->TASKS_SUSPEND);
znew711 0:6a249a5be3a4 136 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 137 sd_ppi_channel_enable_clr(1 << 7);
znew711 0:6a249a5be3a4 138 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 139 }
znew711 0:6a249a5be3a4 140
znew711 0:6a249a5be3a4 141 twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 142
znew711 0:6a249a5be3a4 143 return twi_master_clear_bus();
znew711 0:6a249a5be3a4 144 }
znew711 0:6a249a5be3a4 145 /**********************************************************************
znew711 0:6a249a5be3a4 146 name :
znew711 0:6a249a5be3a4 147 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 148 **********************************************************************/
znew711 0:6a249a5be3a4 149 uint8_t TwoWire::twi_master_write(uint8_t *data, uint8_t data_length, uint8_t issue_stop_condition)
znew711 0:6a249a5be3a4 150 {
znew711 0:6a249a5be3a4 151 uint32_t timeout = MAX_TIMEOUT_LOOPS;
znew711 0:6a249a5be3a4 152
znew711 0:6a249a5be3a4 153 if(data_length == 0)
znew711 0:6a249a5be3a4 154 {
znew711 0:6a249a5be3a4 155 return 1;
znew711 0:6a249a5be3a4 156 }
znew711 0:6a249a5be3a4 157 twi->TXD = *data++;
znew711 0:6a249a5be3a4 158 twi->TASKS_STARTTX = 1;
znew711 0:6a249a5be3a4 159 while(1)
znew711 0:6a249a5be3a4 160 {
znew711 0:6a249a5be3a4 161 while( (twi->EVENTS_TXDSENT == 0) && (--timeout) );//&& (twi->EVENTS_ERROR == 0) );
znew711 0:6a249a5be3a4 162
znew711 0:6a249a5be3a4 163 if( 0 == timeout )//|| twi->EVENTS_ERROR != 0)
znew711 0:6a249a5be3a4 164 {
znew711 0:6a249a5be3a4 165 twi->EVENTS_ERROR = 0;
znew711 0:6a249a5be3a4 166 twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 167 twi->POWER = 0;
znew711 0:6a249a5be3a4 168 TWI_DELAY(5);
znew711 0:6a249a5be3a4 169 twi->POWER = 1;
znew711 0:6a249a5be3a4 170 twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 171
znew711 0:6a249a5be3a4 172 twi_master_init();
znew711 0:6a249a5be3a4 173 return 1;
znew711 0:6a249a5be3a4 174 }
znew711 0:6a249a5be3a4 175 twi->EVENTS_TXDSENT = 0;
znew711 0:6a249a5be3a4 176 if( --data_length == 0)
znew711 0:6a249a5be3a4 177 {
znew711 0:6a249a5be3a4 178 break;
znew711 0:6a249a5be3a4 179 }
znew711 0:6a249a5be3a4 180
znew711 0:6a249a5be3a4 181 twi->TXD = *data++;
znew711 0:6a249a5be3a4 182 }
znew711 0:6a249a5be3a4 183 if(issue_stop_condition)
znew711 0:6a249a5be3a4 184 {
znew711 0:6a249a5be3a4 185 twi->EVENTS_STOPPED = 0;
znew711 0:6a249a5be3a4 186 twi->TASKS_STOP = 1;
znew711 0:6a249a5be3a4 187 while(twi->EVENTS_STOPPED == 0)
znew711 0:6a249a5be3a4 188 {
znew711 0:6a249a5be3a4 189 //do nothing, wait for stop sequence is sent
znew711 0:6a249a5be3a4 190 }
znew711 0:6a249a5be3a4 191 }
znew711 0:6a249a5be3a4 192 return 0;
znew711 0:6a249a5be3a4 193 }
znew711 0:6a249a5be3a4 194 /**********************************************************************
znew711 0:6a249a5be3a4 195 name :
znew711 0:6a249a5be3a4 196 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 197 **********************************************************************/
znew711 0:6a249a5be3a4 198 uint8_t TwoWire::twi_master_read(uint8_t *data, uint8_t data_length, uint8_t issue_stop_condition)
znew711 0:6a249a5be3a4 199 {
znew711 0:6a249a5be3a4 200 uint8_t softdevice_enabled;
znew711 0:6a249a5be3a4 201 uint32_t timeout = MAX_TIMEOUT_LOOPS;// err_code = NRF_SUCCESS;
znew711 0:6a249a5be3a4 202
znew711 0:6a249a5be3a4 203 sd_softdevice_is_enabled(&softdevice_enabled);
znew711 0:6a249a5be3a4 204 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 205 if( 0 == data_length )
znew711 0:6a249a5be3a4 206 {
znew711 0:6a249a5be3a4 207 return 1;
znew711 0:6a249a5be3a4 208 }
znew711 0:6a249a5be3a4 209 else if( 1== data_length )//&& issue_stop_condition == 1)
znew711 0:6a249a5be3a4 210 {
znew711 0:6a249a5be3a4 211 if (softdevice_enabled == 0)
znew711 0:6a249a5be3a4 212 {
znew711 0:6a249a5be3a4 213 NRF_PPI->CH[7].EEP = (uint32_t)&twi->EVENTS_BB;
znew711 0:6a249a5be3a4 214 NRF_PPI->CH[7].TEP = (uint32_t)&twi->TASKS_STOP;
znew711 0:6a249a5be3a4 215 NRF_PPI->CHEN |= (1 << 7);
znew711 0:6a249a5be3a4 216 }
znew711 0:6a249a5be3a4 217 else
znew711 0:6a249a5be3a4 218 {
znew711 0:6a249a5be3a4 219 sd_ppi_channel_assign(7, &twi->EVENTS_BB, &twi->TASKS_STOP);
znew711 0:6a249a5be3a4 220 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 221 sd_ppi_channel_enable_set(1 << 7);
znew711 0:6a249a5be3a4 222 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 223 }
znew711 0:6a249a5be3a4 224 }
znew711 0:6a249a5be3a4 225 else
znew711 0:6a249a5be3a4 226 {
znew711 0:6a249a5be3a4 227 if (softdevice_enabled == 0)
znew711 0:6a249a5be3a4 228 {
znew711 0:6a249a5be3a4 229 NRF_PPI->CH[7].EEP = (uint32_t)&twi->EVENTS_BB;
znew711 0:6a249a5be3a4 230 NRF_PPI->CH[7].TEP = (uint32_t)&twi->TASKS_SUSPEND;
znew711 0:6a249a5be3a4 231 NRF_PPI->CHEN |= (1 << 7);
znew711 0:6a249a5be3a4 232 }
znew711 0:6a249a5be3a4 233 else
znew711 0:6a249a5be3a4 234 {
znew711 0:6a249a5be3a4 235 sd_ppi_channel_assign(7, &twi->EVENTS_BB, &twi->TASKS_SUSPEND);
znew711 0:6a249a5be3a4 236 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 237 sd_ppi_channel_enable_set(1 << 7);
znew711 0:6a249a5be3a4 238 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 239 }
znew711 0:6a249a5be3a4 240 }
znew711 0:6a249a5be3a4 241
znew711 0:6a249a5be3a4 242 twi->EVENTS_RXDREADY = 0;
znew711 0:6a249a5be3a4 243 twi->TASKS_STARTRX = 1;
znew711 0:6a249a5be3a4 244
znew711 0:6a249a5be3a4 245 while(1)
znew711 0:6a249a5be3a4 246 {
znew711 0:6a249a5be3a4 247 while( twi->EVENTS_RXDREADY == 0 && (--timeout) )
znew711 0:6a249a5be3a4 248 {
znew711 0:6a249a5be3a4 249 //do nothing, just wait
znew711 0:6a249a5be3a4 250 }
znew711 0:6a249a5be3a4 251
znew711 0:6a249a5be3a4 252 if( timeout == 0 )
znew711 0:6a249a5be3a4 253 {
znew711 0:6a249a5be3a4 254 twi->EVENTS_ERROR = 0;
znew711 0:6a249a5be3a4 255 twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 256 twi->POWER = 0;
znew711 0:6a249a5be3a4 257 TWI_DELAY(5);
znew711 0:6a249a5be3a4 258 twi->POWER = 1;
znew711 0:6a249a5be3a4 259 twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
znew711 0:6a249a5be3a4 260
znew711 0:6a249a5be3a4 261 twi_master_init();
znew711 0:6a249a5be3a4 262
znew711 0:6a249a5be3a4 263 return 1;
znew711 0:6a249a5be3a4 264 }
znew711 0:6a249a5be3a4 265
znew711 0:6a249a5be3a4 266 twi->EVENTS_RXDREADY = 0;
znew711 0:6a249a5be3a4 267 *data++ = twi->RXD;
znew711 0:6a249a5be3a4 268
znew711 0:6a249a5be3a4 269 if( --data_length == 1 )
znew711 0:6a249a5be3a4 270 {
znew711 0:6a249a5be3a4 271 if (softdevice_enabled == 0)
znew711 0:6a249a5be3a4 272 {
znew711 0:6a249a5be3a4 273 //NRF_PPI->CH[7].EEP = (uint32_t)&twi->EVENTS_BB;
znew711 0:6a249a5be3a4 274 NRF_PPI->CH[7].TEP = (uint32_t)&twi->TASKS_STOP;
znew711 0:6a249a5be3a4 275 }
znew711 0:6a249a5be3a4 276 else
znew711 0:6a249a5be3a4 277 {
znew711 0:6a249a5be3a4 278 sd_ppi_channel_assign(7, &twi->EVENTS_BB, &twi->TASKS_STOP);
znew711 0:6a249a5be3a4 279 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 280 }
znew711 0:6a249a5be3a4 281 }
znew711 0:6a249a5be3a4 282
znew711 0:6a249a5be3a4 283 if( data_length == 0 )
znew711 0:6a249a5be3a4 284 {
znew711 0:6a249a5be3a4 285 twi->TASKS_STOP = 1;
znew711 0:6a249a5be3a4 286 break;
znew711 0:6a249a5be3a4 287 }
znew711 0:6a249a5be3a4 288 TWI_DELAY(20);
znew711 0:6a249a5be3a4 289 twi->TASKS_RESUME = 1;
znew711 0:6a249a5be3a4 290 }
znew711 0:6a249a5be3a4 291 while( twi->EVENTS_STOPPED == 0 )
znew711 0:6a249a5be3a4 292 {
znew711 0:6a249a5be3a4 293 //do nothing
znew711 0:6a249a5be3a4 294 }
znew711 0:6a249a5be3a4 295
znew711 0:6a249a5be3a4 296 twi->EVENTS_STOPPED = 0;
znew711 0:6a249a5be3a4 297
znew711 0:6a249a5be3a4 298 if (softdevice_enabled == 0)
znew711 0:6a249a5be3a4 299 {
znew711 0:6a249a5be3a4 300 NRF_PPI->CHEN &= ~(1 << 7);
znew711 0:6a249a5be3a4 301 }
znew711 0:6a249a5be3a4 302 else
znew711 0:6a249a5be3a4 303 {
znew711 0:6a249a5be3a4 304 sd_ppi_channel_enable_clr( 1 << 7 );
znew711 0:6a249a5be3a4 305 //APP_ERROR_CHECK(err_code);
znew711 0:6a249a5be3a4 306 }
znew711 0:6a249a5be3a4 307 return 0;
znew711 0:6a249a5be3a4 308 }
znew711 0:6a249a5be3a4 309
znew711 0:6a249a5be3a4 310 /**********************************************************************
znew711 0:6a249a5be3a4 311 name :
znew711 0:6a249a5be3a4 312 function :
znew711 0:6a249a5be3a4 313 **********************************************************************/
znew711 0:6a249a5be3a4 314 TwoWire::TwoWire(NRF_TWI_Type *twi_use)
znew711 0:6a249a5be3a4 315 {
znew711 0:6a249a5be3a4 316 twi = twi_use;
znew711 0:6a249a5be3a4 317
znew711 0:6a249a5be3a4 318 RX_BufferIndex = 0;
znew711 0:6a249a5be3a4 319 RX_BufferLength = 0;
znew711 0:6a249a5be3a4 320 TX_BufferIndex = 0;
znew711 0:6a249a5be3a4 321 TX_BufferLength = 0;
znew711 0:6a249a5be3a4 322
znew711 0:6a249a5be3a4 323 Transform_Addr = 0;
znew711 0:6a249a5be3a4 324
znew711 0:6a249a5be3a4 325 twi_status = UNINITIALIZED;
znew711 0:6a249a5be3a4 326 }
znew711 0:6a249a5be3a4 327 /**********************************************************************
znew711 0:6a249a5be3a4 328 name :
znew711 0:6a249a5be3a4 329 function :
znew711 0:6a249a5be3a4 330 **********************************************************************/
znew711 0:6a249a5be3a4 331 void TwoWire::begin(uint32_t scl, uint32_t sda, uint8_t speed)
znew711 0:6a249a5be3a4 332 {
znew711 0:6a249a5be3a4 333 if( speed == 2 )
znew711 0:6a249a5be3a4 334 {
znew711 0:6a249a5be3a4 335 twi_frequency = TWI_FREQUENCY_FREQUENCY_K400;
znew711 0:6a249a5be3a4 336 }
znew711 0:6a249a5be3a4 337 else if( speed == 1 )
znew711 0:6a249a5be3a4 338 {
znew711 0:6a249a5be3a4 339 twi_frequency = TWI_FREQUENCY_FREQUENCY_K250;
znew711 0:6a249a5be3a4 340 }
znew711 0:6a249a5be3a4 341 else
znew711 0:6a249a5be3a4 342 {
znew711 0:6a249a5be3a4 343 twi_frequency = TWI_FREQUENCY_FREQUENCY_K100;
znew711 0:6a249a5be3a4 344 }
znew711 0:6a249a5be3a4 345
znew711 0:6a249a5be3a4 346 SCL_Pin = scl;
znew711 0:6a249a5be3a4 347 SDA_Pin = sda;
znew711 0:6a249a5be3a4 348 twi_master_init();
znew711 0:6a249a5be3a4 349
znew711 0:6a249a5be3a4 350 twi_status = MASTER_IDLE;
znew711 0:6a249a5be3a4 351 }
znew711 0:6a249a5be3a4 352 /**********************************************************************
znew711 0:6a249a5be3a4 353 name :
znew711 0:6a249a5be3a4 354 function :
znew711 0:6a249a5be3a4 355 **********************************************************************/
znew711 0:6a249a5be3a4 356 void TwoWire::begin()
znew711 0:6a249a5be3a4 357 {
znew711 0:6a249a5be3a4 358 begin(TWI_SCL, TWI_SDA, 0);
znew711 0:6a249a5be3a4 359 }
znew711 0:6a249a5be3a4 360 /**********************************************************************
znew711 0:6a249a5be3a4 361 name :
znew711 0:6a249a5be3a4 362 function :
znew711 0:6a249a5be3a4 363 **********************************************************************/
znew711 0:6a249a5be3a4 364 void TwoWire::beginTransmission( uint8_t address )
znew711 0:6a249a5be3a4 365 {
znew711 0:6a249a5be3a4 366 Transform_Addr = address;
znew711 0:6a249a5be3a4 367 TX_BufferIndex = 0;
znew711 0:6a249a5be3a4 368 twi_status = MASTER_SEND;
znew711 0:6a249a5be3a4 369 }
znew711 0:6a249a5be3a4 370 /**********************************************************************
znew711 0:6a249a5be3a4 371 name :
znew711 0:6a249a5be3a4 372 function :
znew711 0:6a249a5be3a4 373 **********************************************************************/
znew711 0:6a249a5be3a4 374 void TwoWire::beginTransmission( int address )
znew711 0:6a249a5be3a4 375 {
znew711 0:6a249a5be3a4 376 beginTransmission( (uint8_t)address );
znew711 0:6a249a5be3a4 377 }
znew711 0:6a249a5be3a4 378 /**********************************************************************
znew711 0:6a249a5be3a4 379 name :
znew711 0:6a249a5be3a4 380 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 381 **********************************************************************/
znew711 0:6a249a5be3a4 382 uint8_t TwoWire::endTransmission( uint8_t stop)
znew711 0:6a249a5be3a4 383 {
znew711 0:6a249a5be3a4 384 uint8_t twi_flag = 1;
znew711 0:6a249a5be3a4 385
znew711 0:6a249a5be3a4 386 if(TX_BufferLength > 0 && !(twi_master_clear_bus()) )
znew711 0:6a249a5be3a4 387 {
znew711 0:6a249a5be3a4 388 twi->ADDRESS = ( Transform_Addr >> 1);
znew711 0:6a249a5be3a4 389 twi_flag = twi_master_write(TX_Buffer, TX_BufferLength, stop);
znew711 0:6a249a5be3a4 390 }
znew711 0:6a249a5be3a4 391
znew711 0:6a249a5be3a4 392 TX_BufferLength = 0;
znew711 0:6a249a5be3a4 393 twi_status = MASTER_IDLE;
znew711 0:6a249a5be3a4 394
znew711 0:6a249a5be3a4 395 return twi_flag;
znew711 0:6a249a5be3a4 396 }
znew711 0:6a249a5be3a4 397 /**********************************************************************
znew711 0:6a249a5be3a4 398 name :
znew711 0:6a249a5be3a4 399 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 400 **********************************************************************/
znew711 0:6a249a5be3a4 401 uint8_t TwoWire::endTransmission(void)
znew711 0:6a249a5be3a4 402 {
znew711 0:6a249a5be3a4 403 uint8_t twi_flag;
znew711 0:6a249a5be3a4 404
znew711 0:6a249a5be3a4 405 twi_flag = endTransmission(1);
znew711 0:6a249a5be3a4 406
znew711 0:6a249a5be3a4 407 return twi_flag;
znew711 0:6a249a5be3a4 408 }
znew711 0:6a249a5be3a4 409 /**********************************************************************
znew711 0:6a249a5be3a4 410 name :
znew711 0:6a249a5be3a4 411 function : return: 0--SUCCESS, -1--FAIL,
znew711 0:6a249a5be3a4 412 **********************************************************************/
znew711 0:6a249a5be3a4 413 int TwoWire::write(uint8_t data)
znew711 0:6a249a5be3a4 414 {
znew711 0:6a249a5be3a4 415 if(twi_status == MASTER_SEND)
znew711 0:6a249a5be3a4 416 {
znew711 0:6a249a5be3a4 417 if(TX_BufferLength >= BUFF_MAX_LENGTH)
znew711 0:6a249a5be3a4 418 {
znew711 0:6a249a5be3a4 419 return -1;
znew711 0:6a249a5be3a4 420 }
znew711 0:6a249a5be3a4 421 TX_Buffer[TX_BufferLength++] = data;
znew711 0:6a249a5be3a4 422 return 0;
znew711 0:6a249a5be3a4 423 }
znew711 0:6a249a5be3a4 424 else
znew711 0:6a249a5be3a4 425 {
znew711 0:6a249a5be3a4 426 return -1;
znew711 0:6a249a5be3a4 427 }
znew711 0:6a249a5be3a4 428 }
znew711 0:6a249a5be3a4 429 /**********************************************************************
znew711 0:6a249a5be3a4 430 name :
znew711 0:6a249a5be3a4 431 function : return: -1--FAIL, else--the length of data stored
znew711 0:6a249a5be3a4 432 **********************************************************************/
znew711 0:6a249a5be3a4 433 int TwoWire::write(const uint8_t *data, size_t quantity )
znew711 0:6a249a5be3a4 434 {
znew711 0:6a249a5be3a4 435 if( twi_status == MASTER_SEND )
znew711 0:6a249a5be3a4 436 {
znew711 0:6a249a5be3a4 437 for( size_t i=0; i<quantity; ++i )
znew711 0:6a249a5be3a4 438 {
znew711 0:6a249a5be3a4 439 if(TX_BufferLength >= BUFF_MAX_LENGTH)
znew711 0:6a249a5be3a4 440 {
znew711 0:6a249a5be3a4 441 return i;
znew711 0:6a249a5be3a4 442 }
znew711 0:6a249a5be3a4 443 TX_Buffer[TX_BufferLength++] = data[i];
znew711 0:6a249a5be3a4 444 }
znew711 0:6a249a5be3a4 445 }
znew711 0:6a249a5be3a4 446 else
znew711 0:6a249a5be3a4 447 {
znew711 0:6a249a5be3a4 448 return -1;
znew711 0:6a249a5be3a4 449 }
znew711 0:6a249a5be3a4 450
znew711 0:6a249a5be3a4 451 return quantity;
znew711 0:6a249a5be3a4 452 }
znew711 0:6a249a5be3a4 453 /**********************************************************************
znew711 0:6a249a5be3a4 454 name :
znew711 0:6a249a5be3a4 455 function : return: 0--SUCCESS, 1--FAIL
znew711 0:6a249a5be3a4 456 **********************************************************************/
znew711 0:6a249a5be3a4 457 uint8_t TwoWire::requestFrom(uint8_t addr, uint8_t quantity, uint8_t stop)
znew711 0:6a249a5be3a4 458 {
znew711 0:6a249a5be3a4 459 uint8_t twi_flag = 1;
znew711 0:6a249a5be3a4 460
znew711 0:6a249a5be3a4 461 if(quantity > BUFF_MAX_LENGTH)
znew711 0:6a249a5be3a4 462 {
znew711 0:6a249a5be3a4 463 quantity = BUFF_MAX_LENGTH;
znew711 0:6a249a5be3a4 464 }
znew711 0:6a249a5be3a4 465 if(quantity > 0 && !(twi_master_clear_bus()) )
znew711 0:6a249a5be3a4 466 {
znew711 0:6a249a5be3a4 467 twi->ADDRESS = ( addr >> 1 );
znew711 0:6a249a5be3a4 468 twi_flag = twi_master_read(RX_Buffer, quantity, stop);
znew711 0:6a249a5be3a4 469 }
znew711 0:6a249a5be3a4 470 RX_BufferIndex = 0;
znew711 0:6a249a5be3a4 471 RX_BufferLength = quantity;
znew711 0:6a249a5be3a4 472
znew711 0:6a249a5be3a4 473 return twi_flag;
znew711 0:6a249a5be3a4 474 }
znew711 0:6a249a5be3a4 475 /**********************************************************************
znew711 0:6a249a5be3a4 476 name :
znew711 0:6a249a5be3a4 477 function :
znew711 0:6a249a5be3a4 478 **********************************************************************/
znew711 0:6a249a5be3a4 479 uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
znew711 0:6a249a5be3a4 480 {
znew711 0:6a249a5be3a4 481 return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) true);
znew711 0:6a249a5be3a4 482 }
znew711 0:6a249a5be3a4 483 /**********************************************************************
znew711 0:6a249a5be3a4 484 name :
znew711 0:6a249a5be3a4 485 function :
znew711 0:6a249a5be3a4 486 **********************************************************************/
znew711 0:6a249a5be3a4 487 uint8_t TwoWire::requestFrom(int address, int quantity)
znew711 0:6a249a5be3a4 488 {
znew711 0:6a249a5be3a4 489 return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) true);
znew711 0:6a249a5be3a4 490 }
znew711 0:6a249a5be3a4 491 /**********************************************************************
znew711 0:6a249a5be3a4 492 name :
znew711 0:6a249a5be3a4 493 function :
znew711 0:6a249a5be3a4 494 **********************************************************************/
znew711 0:6a249a5be3a4 495 uint8_t TwoWire::requestFrom(int address, int quantity, int sendStop)
znew711 0:6a249a5be3a4 496 {
znew711 0:6a249a5be3a4 497 return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) sendStop);
znew711 0:6a249a5be3a4 498 }
znew711 0:6a249a5be3a4 499 /**********************************************************************
znew711 0:6a249a5be3a4 500 name :
znew711 0:6a249a5be3a4 501 function : return:-1--FAIL, else:the length of data that could be read
znew711 0:6a249a5be3a4 502 **********************************************************************/
znew711 0:6a249a5be3a4 503 int TwoWire::available(void)
znew711 0:6a249a5be3a4 504 {
znew711 0:6a249a5be3a4 505 if(RX_BufferIndex <= RX_BufferLength)
znew711 0:6a249a5be3a4 506 {
znew711 0:6a249a5be3a4 507 return (RX_BufferLength - RX_BufferIndex);
znew711 0:6a249a5be3a4 508 }
znew711 0:6a249a5be3a4 509 else
znew711 0:6a249a5be3a4 510 {
znew711 0:6a249a5be3a4 511 return -1;
znew711 0:6a249a5be3a4 512 }
znew711 0:6a249a5be3a4 513 }
znew711 0:6a249a5be3a4 514 /**********************************************************************
znew711 0:6a249a5be3a4 515 name :
znew711 0:6a249a5be3a4 516 function :
znew711 0:6a249a5be3a4 517 **********************************************************************/
znew711 0:6a249a5be3a4 518 int TwoWire::read(void)
znew711 0:6a249a5be3a4 519 {
znew711 0:6a249a5be3a4 520 if(RX_BufferIndex < RX_BufferLength)
znew711 0:6a249a5be3a4 521 {
znew711 0:6a249a5be3a4 522 return RX_Buffer[RX_BufferIndex++];
znew711 0:6a249a5be3a4 523 }
znew711 0:6a249a5be3a4 524 else
znew711 0:6a249a5be3a4 525 {
znew711 0:6a249a5be3a4 526 return -1;
znew711 0:6a249a5be3a4 527 }
znew711 0:6a249a5be3a4 528 }
znew711 0:6a249a5be3a4 529
znew711 0:6a249a5be3a4 530
znew711 0:6a249a5be3a4 531
znew711 0:6a249a5be3a4 532
znew711 0:6a249a5be3a4 533
znew711 0:6a249a5be3a4 534
znew711 0:6a249a5be3a4 535