mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NORDIC/TARGET_NRF51822/i2c_api.c@85:e1a8e879a6a9, 2014-02-07 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Feb 07 18:00:11 2014 +0000
- Revision:
- 85:e1a8e879a6a9
- Child:
- 104:a6a92e2e5a92
Synchronized with git revision 4b2b368a6a3b1f0fd33d99917981c67436c4aebe
Full URL: https://github.com/mbedmicro/mbed/commit/4b2b368a6a3b1f0fd33d99917981c67436c4aebe/
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 85:e1a8e879a6a9 | 1 | /* mbed Microcontroller Library |
mbed_official | 85:e1a8e879a6a9 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 85:e1a8e879a6a9 | 3 | * |
mbed_official | 85:e1a8e879a6a9 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 85:e1a8e879a6a9 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 85:e1a8e879a6a9 | 6 | * You may obtain a copy of the License at |
mbed_official | 85:e1a8e879a6a9 | 7 | * |
mbed_official | 85:e1a8e879a6a9 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 85:e1a8e879a6a9 | 9 | * |
mbed_official | 85:e1a8e879a6a9 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 85:e1a8e879a6a9 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 85:e1a8e879a6a9 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 85:e1a8e879a6a9 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 85:e1a8e879a6a9 | 14 | * limitations under the License. |
mbed_official | 85:e1a8e879a6a9 | 15 | */ |
mbed_official | 85:e1a8e879a6a9 | 16 | #include "i2c_api.h" |
mbed_official | 85:e1a8e879a6a9 | 17 | #include "cmsis.h" |
mbed_official | 85:e1a8e879a6a9 | 18 | #include "pinmap.h" |
mbed_official | 85:e1a8e879a6a9 | 19 | #include "error.h" |
mbed_official | 85:e1a8e879a6a9 | 20 | |
mbed_official | 85:e1a8e879a6a9 | 21 | |
mbed_official | 85:e1a8e879a6a9 | 22 | |
mbed_official | 85:e1a8e879a6a9 | 23 | static const PinMap PinMap_I2C_SDA[] = { |
mbed_official | 85:e1a8e879a6a9 | 24 | {p22, I2C_0, 1}, |
mbed_official | 85:e1a8e879a6a9 | 25 | {p13, I2C_1, 2}, |
mbed_official | 85:e1a8e879a6a9 | 26 | {NC , NC , 0} |
mbed_official | 85:e1a8e879a6a9 | 27 | }; |
mbed_official | 85:e1a8e879a6a9 | 28 | |
mbed_official | 85:e1a8e879a6a9 | 29 | static const PinMap PinMap_I2C_SCL[] = { |
mbed_official | 85:e1a8e879a6a9 | 30 | {p20, I2C_0, 1}, |
mbed_official | 85:e1a8e879a6a9 | 31 | {p15, I2C_1, 2}, |
mbed_official | 85:e1a8e879a6a9 | 32 | {NC , NC, 0} |
mbed_official | 85:e1a8e879a6a9 | 33 | }; |
mbed_official | 85:e1a8e879a6a9 | 34 | |
mbed_official | 85:e1a8e879a6a9 | 35 | uint8_t addrSet=0; |
mbed_official | 85:e1a8e879a6a9 | 36 | |
mbed_official | 85:e1a8e879a6a9 | 37 | void i2c_interface_enable(i2c_t *obj){ |
mbed_official | 85:e1a8e879a6a9 | 38 | obj->i2c->ENABLE = (TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos); |
mbed_official | 85:e1a8e879a6a9 | 39 | } |
mbed_official | 85:e1a8e879a6a9 | 40 | |
mbed_official | 85:e1a8e879a6a9 | 41 | void twi_master_init(i2c_t *obj, PinName sda, PinName scl, int frequency) { |
mbed_official | 85:e1a8e879a6a9 | 42 | NRF_GPIO->PIN_CNF[scl] = ((GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 43 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 44 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 45 | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 46 | (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)); |
mbed_official | 85:e1a8e879a6a9 | 47 | |
mbed_official | 85:e1a8e879a6a9 | 48 | NRF_GPIO->PIN_CNF[sda] = ((GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 49 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 50 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 51 | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) | |
mbed_official | 85:e1a8e879a6a9 | 52 | (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)); |
mbed_official | 85:e1a8e879a6a9 | 53 | |
mbed_official | 85:e1a8e879a6a9 | 54 | obj->i2c->PSELSCL = scl; |
mbed_official | 85:e1a8e879a6a9 | 55 | obj->i2c->PSELSDA = sda; |
mbed_official | 85:e1a8e879a6a9 | 56 | // set default frequency at 100k |
mbed_official | 85:e1a8e879a6a9 | 57 | i2c_frequency(obj, frequency); |
mbed_official | 85:e1a8e879a6a9 | 58 | i2c_interface_enable(obj); |
mbed_official | 85:e1a8e879a6a9 | 59 | } |
mbed_official | 85:e1a8e879a6a9 | 60 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
mbed_official | 85:e1a8e879a6a9 | 61 | // determine the SPI to use |
mbed_official | 85:e1a8e879a6a9 | 62 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 85:e1a8e879a6a9 | 63 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 85:e1a8e879a6a9 | 64 | I2CName i2c = (I2CName)pinmap_merge(i2c_sda,i2c_scl); |
mbed_official | 85:e1a8e879a6a9 | 65 | obj->i2c = (NRF_TWI_Type *)i2c; |
mbed_official | 85:e1a8e879a6a9 | 66 | |
mbed_official | 85:e1a8e879a6a9 | 67 | if ((int)obj->i2c == NC) { |
mbed_official | 85:e1a8e879a6a9 | 68 | error("I2C pin mapping failed"); |
mbed_official | 85:e1a8e879a6a9 | 69 | } |
mbed_official | 85:e1a8e879a6a9 | 70 | |
mbed_official | 85:e1a8e879a6a9 | 71 | obj->scl=scl; |
mbed_official | 85:e1a8e879a6a9 | 72 | obj->sda=sda; |
mbed_official | 85:e1a8e879a6a9 | 73 | obj->i2c->EVENTS_ERROR = 0; |
mbed_official | 85:e1a8e879a6a9 | 74 | obj->i2c->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; |
mbed_official | 85:e1a8e879a6a9 | 75 | obj->i2c->POWER = 0; |
mbed_official | 85:e1a8e879a6a9 | 76 | |
mbed_official | 85:e1a8e879a6a9 | 77 | for(int i=0;i<100;i++){ |
mbed_official | 85:e1a8e879a6a9 | 78 | } |
mbed_official | 85:e1a8e879a6a9 | 79 | |
mbed_official | 85:e1a8e879a6a9 | 80 | obj->i2c->POWER = 1; |
mbed_official | 85:e1a8e879a6a9 | 81 | twi_master_init(obj,sda,scl,100000); |
mbed_official | 85:e1a8e879a6a9 | 82 | } |
mbed_official | 85:e1a8e879a6a9 | 83 | void i2c_reset(i2c_t *obj) { |
mbed_official | 85:e1a8e879a6a9 | 84 | obj->i2c->EVENTS_ERROR = 0; |
mbed_official | 85:e1a8e879a6a9 | 85 | obj->i2c->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; |
mbed_official | 85:e1a8e879a6a9 | 86 | obj->i2c->POWER = 0; |
mbed_official | 85:e1a8e879a6a9 | 87 | for(int i=0;i<100;i++){ |
mbed_official | 85:e1a8e879a6a9 | 88 | } |
mbed_official | 85:e1a8e879a6a9 | 89 | |
mbed_official | 85:e1a8e879a6a9 | 90 | obj->i2c->POWER = 1; |
mbed_official | 85:e1a8e879a6a9 | 91 | twi_master_init(obj,obj->sda,obj->scl,obj->freq); |
mbed_official | 85:e1a8e879a6a9 | 92 | } |
mbed_official | 85:e1a8e879a6a9 | 93 | |
mbed_official | 85:e1a8e879a6a9 | 94 | int i2c_start(i2c_t *obj) { |
mbed_official | 85:e1a8e879a6a9 | 95 | int status = 0; |
mbed_official | 85:e1a8e879a6a9 | 96 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 97 | addrSet=0; |
mbed_official | 85:e1a8e879a6a9 | 98 | return status; |
mbed_official | 85:e1a8e879a6a9 | 99 | } |
mbed_official | 85:e1a8e879a6a9 | 100 | |
mbed_official | 85:e1a8e879a6a9 | 101 | int i2c_stop(i2c_t *obj) { |
mbed_official | 85:e1a8e879a6a9 | 102 | int timeOut = 100000; |
mbed_official | 85:e1a8e879a6a9 | 103 | obj->i2c->EVENTS_STOPPED = 0; |
mbed_official | 85:e1a8e879a6a9 | 104 | // write the stop bit |
mbed_official | 85:e1a8e879a6a9 | 105 | obj->i2c->TASKS_STOP = 1; |
mbed_official | 85:e1a8e879a6a9 | 106 | while(!obj->i2c->EVENTS_STOPPED){ |
mbed_official | 85:e1a8e879a6a9 | 107 | timeOut--; |
mbed_official | 85:e1a8e879a6a9 | 108 | if(timeOut<0) |
mbed_official | 85:e1a8e879a6a9 | 109 | return 1; |
mbed_official | 85:e1a8e879a6a9 | 110 | } |
mbed_official | 85:e1a8e879a6a9 | 111 | addrSet = 0; |
mbed_official | 85:e1a8e879a6a9 | 112 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 113 | return 0; |
mbed_official | 85:e1a8e879a6a9 | 114 | } |
mbed_official | 85:e1a8e879a6a9 | 115 | |
mbed_official | 85:e1a8e879a6a9 | 116 | |
mbed_official | 85:e1a8e879a6a9 | 117 | int i2c_do_write(i2c_t *obj, int value) { |
mbed_official | 85:e1a8e879a6a9 | 118 | int timeOut = 100000; |
mbed_official | 85:e1a8e879a6a9 | 119 | obj->i2c->TXD = value; |
mbed_official | 85:e1a8e879a6a9 | 120 | while(!obj->i2c->EVENTS_TXDSENT){ |
mbed_official | 85:e1a8e879a6a9 | 121 | timeOut--; |
mbed_official | 85:e1a8e879a6a9 | 122 | if(timeOut<0) |
mbed_official | 85:e1a8e879a6a9 | 123 | return 1; |
mbed_official | 85:e1a8e879a6a9 | 124 | } |
mbed_official | 85:e1a8e879a6a9 | 125 | obj->i2c->EVENTS_TXDSENT = 0; |
mbed_official | 85:e1a8e879a6a9 | 126 | return 0; |
mbed_official | 85:e1a8e879a6a9 | 127 | } |
mbed_official | 85:e1a8e879a6a9 | 128 | |
mbed_official | 85:e1a8e879a6a9 | 129 | int i2c_do_read(i2c_t *obj, char * data, int last) { |
mbed_official | 85:e1a8e879a6a9 | 130 | int timeOut = 100000; |
mbed_official | 85:e1a8e879a6a9 | 131 | while(!obj->i2c->EVENTS_RXDREADY){ |
mbed_official | 85:e1a8e879a6a9 | 132 | timeOut--; |
mbed_official | 85:e1a8e879a6a9 | 133 | if(timeOut<0) |
mbed_official | 85:e1a8e879a6a9 | 134 | return 1; |
mbed_official | 85:e1a8e879a6a9 | 135 | } |
mbed_official | 85:e1a8e879a6a9 | 136 | obj->i2c->EVENTS_RXDREADY = 0; |
mbed_official | 85:e1a8e879a6a9 | 137 | |
mbed_official | 85:e1a8e879a6a9 | 138 | if (last){ |
mbed_official | 85:e1a8e879a6a9 | 139 | obj->i2c->TASKS_STOP = 1; |
mbed_official | 85:e1a8e879a6a9 | 140 | } |
mbed_official | 85:e1a8e879a6a9 | 141 | *data = obj->i2c->RXD; |
mbed_official | 85:e1a8e879a6a9 | 142 | |
mbed_official | 85:e1a8e879a6a9 | 143 | for(int i=0;i<320;i++){ |
mbed_official | 85:e1a8e879a6a9 | 144 | } |
mbed_official | 85:e1a8e879a6a9 | 145 | |
mbed_official | 85:e1a8e879a6a9 | 146 | obj->i2c->TASKS_RESUME = 1; |
mbed_official | 85:e1a8e879a6a9 | 147 | |
mbed_official | 85:e1a8e879a6a9 | 148 | return 0; |
mbed_official | 85:e1a8e879a6a9 | 149 | } |
mbed_official | 85:e1a8e879a6a9 | 150 | |
mbed_official | 85:e1a8e879a6a9 | 151 | |
mbed_official | 85:e1a8e879a6a9 | 152 | void i2c_frequency(i2c_t *obj, int hz) { |
mbed_official | 85:e1a8e879a6a9 | 153 | if(hz<250000){ |
mbed_official | 85:e1a8e879a6a9 | 154 | obj->freq = 100000; |
mbed_official | 85:e1a8e879a6a9 | 155 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos); |
mbed_official | 85:e1a8e879a6a9 | 156 | } |
mbed_official | 85:e1a8e879a6a9 | 157 | else if(hz<400000){ |
mbed_official | 85:e1a8e879a6a9 | 158 | obj->freq = 250000; |
mbed_official | 85:e1a8e879a6a9 | 159 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K250 << TWI_FREQUENCY_FREQUENCY_Pos); |
mbed_official | 85:e1a8e879a6a9 | 160 | } |
mbed_official | 85:e1a8e879a6a9 | 161 | else{ |
mbed_official | 85:e1a8e879a6a9 | 162 | obj->freq = 400000; |
mbed_official | 85:e1a8e879a6a9 | 163 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K400 << TWI_FREQUENCY_FREQUENCY_Pos); |
mbed_official | 85:e1a8e879a6a9 | 164 | } |
mbed_official | 85:e1a8e879a6a9 | 165 | } |
mbed_official | 85:e1a8e879a6a9 | 166 | |
mbed_official | 85:e1a8e879a6a9 | 167 | int checkError(i2c_t *obj){ |
mbed_official | 85:e1a8e879a6a9 | 168 | if (obj->i2c->EVENTS_ERROR == 1){ |
mbed_official | 85:e1a8e879a6a9 | 169 | if (obj->i2c->ERRORSRC & TWI_ERRORSRC_ANACK_Msk){ |
mbed_official | 85:e1a8e879a6a9 | 170 | obj->i2c->EVENTS_ERROR = 0; |
mbed_official | 85:e1a8e879a6a9 | 171 | obj->i2c->TASKS_STOP = 1; |
mbed_official | 85:e1a8e879a6a9 | 172 | return I2C_ERROR_BUS_BUSY; |
mbed_official | 85:e1a8e879a6a9 | 173 | } |
mbed_official | 85:e1a8e879a6a9 | 174 | |
mbed_official | 85:e1a8e879a6a9 | 175 | obj->i2c->EVENTS_ERROR = 0; |
mbed_official | 85:e1a8e879a6a9 | 176 | obj->i2c->TASKS_STOP = 1; |
mbed_official | 85:e1a8e879a6a9 | 177 | return I2C_ERROR_NO_SLAVE; |
mbed_official | 85:e1a8e879a6a9 | 178 | } |
mbed_official | 85:e1a8e879a6a9 | 179 | return 0; |
mbed_official | 85:e1a8e879a6a9 | 180 | } |
mbed_official | 85:e1a8e879a6a9 | 181 | |
mbed_official | 85:e1a8e879a6a9 | 182 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
mbed_official | 85:e1a8e879a6a9 | 183 | int status,count,errorResult; |
mbed_official | 85:e1a8e879a6a9 | 184 | obj->i2c->ADDRESS = (address>>1); |
mbed_official | 85:e1a8e879a6a9 | 185 | obj->i2c->SHORTS = 0; |
mbed_official | 85:e1a8e879a6a9 | 186 | obj->i2c->EVENTS_RXDREADY = 0; |
mbed_official | 85:e1a8e879a6a9 | 187 | obj->i2c->TASKS_STARTRX = 1; |
mbed_official | 85:e1a8e879a6a9 | 188 | |
mbed_official | 85:e1a8e879a6a9 | 189 | // Read in all except last byte |
mbed_official | 85:e1a8e879a6a9 | 190 | for (count = 0; count < (length - 1); count++) { |
mbed_official | 85:e1a8e879a6a9 | 191 | status = i2c_do_read(obj,&data[count], 0); |
mbed_official | 85:e1a8e879a6a9 | 192 | if (status) { |
mbed_official | 85:e1a8e879a6a9 | 193 | errorResult = checkError(obj); |
mbed_official | 85:e1a8e879a6a9 | 194 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 195 | if(errorResult<0){ |
mbed_official | 85:e1a8e879a6a9 | 196 | return errorResult; |
mbed_official | 85:e1a8e879a6a9 | 197 | } |
mbed_official | 85:e1a8e879a6a9 | 198 | return count; |
mbed_official | 85:e1a8e879a6a9 | 199 | } |
mbed_official | 85:e1a8e879a6a9 | 200 | } |
mbed_official | 85:e1a8e879a6a9 | 201 | |
mbed_official | 85:e1a8e879a6a9 | 202 | // read in last byte |
mbed_official | 85:e1a8e879a6a9 | 203 | status = i2c_do_read(obj,&data[length-1], 1); |
mbed_official | 85:e1a8e879a6a9 | 204 | if (status) { |
mbed_official | 85:e1a8e879a6a9 | 205 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 206 | return length - 1; |
mbed_official | 85:e1a8e879a6a9 | 207 | } |
mbed_official | 85:e1a8e879a6a9 | 208 | // If not repeated start, send stop. |
mbed_official | 85:e1a8e879a6a9 | 209 | if (stop) { |
mbed_official | 85:e1a8e879a6a9 | 210 | while(!obj->i2c->EVENTS_STOPPED){ |
mbed_official | 85:e1a8e879a6a9 | 211 | } |
mbed_official | 85:e1a8e879a6a9 | 212 | obj->i2c->EVENTS_STOPPED = 0; |
mbed_official | 85:e1a8e879a6a9 | 213 | } |
mbed_official | 85:e1a8e879a6a9 | 214 | return length; |
mbed_official | 85:e1a8e879a6a9 | 215 | } |
mbed_official | 85:e1a8e879a6a9 | 216 | |
mbed_official | 85:e1a8e879a6a9 | 217 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
mbed_official | 85:e1a8e879a6a9 | 218 | int status, errorResult; |
mbed_official | 85:e1a8e879a6a9 | 219 | obj->i2c->ADDRESS = (address>>1); |
mbed_official | 85:e1a8e879a6a9 | 220 | obj->i2c->SHORTS = 0; |
mbed_official | 85:e1a8e879a6a9 | 221 | obj->i2c->TASKS_STARTTX = 1; |
mbed_official | 85:e1a8e879a6a9 | 222 | |
mbed_official | 85:e1a8e879a6a9 | 223 | for (int i=0; i<length; i++) { |
mbed_official | 85:e1a8e879a6a9 | 224 | status = i2c_do_write(obj, data[i]); |
mbed_official | 85:e1a8e879a6a9 | 225 | if(status) { |
mbed_official | 85:e1a8e879a6a9 | 226 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 227 | errorResult = checkError(obj); |
mbed_official | 85:e1a8e879a6a9 | 228 | if(errorResult<0){ |
mbed_official | 85:e1a8e879a6a9 | 229 | return errorResult; |
mbed_official | 85:e1a8e879a6a9 | 230 | } |
mbed_official | 85:e1a8e879a6a9 | 231 | return i; |
mbed_official | 85:e1a8e879a6a9 | 232 | } |
mbed_official | 85:e1a8e879a6a9 | 233 | } |
mbed_official | 85:e1a8e879a6a9 | 234 | |
mbed_official | 85:e1a8e879a6a9 | 235 | // If not repeated start, send stop. |
mbed_official | 85:e1a8e879a6a9 | 236 | if (stop) { |
mbed_official | 85:e1a8e879a6a9 | 237 | if(i2c_stop(obj)){ |
mbed_official | 85:e1a8e879a6a9 | 238 | return I2C_ERROR_NO_SLAVE; |
mbed_official | 85:e1a8e879a6a9 | 239 | } |
mbed_official | 85:e1a8e879a6a9 | 240 | } |
mbed_official | 85:e1a8e879a6a9 | 241 | return length; |
mbed_official | 85:e1a8e879a6a9 | 242 | } |
mbed_official | 85:e1a8e879a6a9 | 243 | |
mbed_official | 85:e1a8e879a6a9 | 244 | int i2c_byte_read(i2c_t *obj, int last) { |
mbed_official | 85:e1a8e879a6a9 | 245 | char data; |
mbed_official | 85:e1a8e879a6a9 | 246 | int status; |
mbed_official | 85:e1a8e879a6a9 | 247 | |
mbed_official | 85:e1a8e879a6a9 | 248 | status = i2c_do_read(obj,&data, last); |
mbed_official | 85:e1a8e879a6a9 | 249 | if (status) { |
mbed_official | 85:e1a8e879a6a9 | 250 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 251 | } |
mbed_official | 85:e1a8e879a6a9 | 252 | return data; |
mbed_official | 85:e1a8e879a6a9 | 253 | } |
mbed_official | 85:e1a8e879a6a9 | 254 | |
mbed_official | 85:e1a8e879a6a9 | 255 | int i2c_byte_write(i2c_t *obj, int data) { |
mbed_official | 85:e1a8e879a6a9 | 256 | int status = 0; |
mbed_official | 85:e1a8e879a6a9 | 257 | if(!addrSet){ |
mbed_official | 85:e1a8e879a6a9 | 258 | addrSet = 1; |
mbed_official | 85:e1a8e879a6a9 | 259 | obj->i2c->ADDRESS = (data>>1); |
mbed_official | 85:e1a8e879a6a9 | 260 | |
mbed_official | 85:e1a8e879a6a9 | 261 | if(data&1){ |
mbed_official | 85:e1a8e879a6a9 | 262 | obj->i2c->EVENTS_RXDREADY = 0; |
mbed_official | 85:e1a8e879a6a9 | 263 | obj->i2c->TASKS_STARTRX = 1; |
mbed_official | 85:e1a8e879a6a9 | 264 | } |
mbed_official | 85:e1a8e879a6a9 | 265 | else{ |
mbed_official | 85:e1a8e879a6a9 | 266 | obj->i2c->TASKS_STARTTX = 1; |
mbed_official | 85:e1a8e879a6a9 | 267 | } |
mbed_official | 85:e1a8e879a6a9 | 268 | } |
mbed_official | 85:e1a8e879a6a9 | 269 | else{ |
mbed_official | 85:e1a8e879a6a9 | 270 | status = i2c_do_write(obj, data); |
mbed_official | 85:e1a8e879a6a9 | 271 | if(status) { |
mbed_official | 85:e1a8e879a6a9 | 272 | i2c_reset(obj); |
mbed_official | 85:e1a8e879a6a9 | 273 | } |
mbed_official | 85:e1a8e879a6a9 | 274 | } |
mbed_official | 85:e1a8e879a6a9 | 275 | return (1-status); |
mbed_official | 85:e1a8e879a6a9 | 276 | } |