Mouse code for the MacroRat
mbed-dev/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/i2c_api.c@18:6a4db94011d3, 2017-05-14 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sun May 14 23:18:57 2017 +0000
- Revision:
- 18:6a4db94011d3
Publishing again
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sahilmgandhi | 18:6a4db94011d3 | 1 | /* mbed Microcontroller Library |
sahilmgandhi | 18:6a4db94011d3 | 2 | * Copyright (c) 2013 Nordic Semiconductor |
sahilmgandhi | 18:6a4db94011d3 | 3 | * |
sahilmgandhi | 18:6a4db94011d3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
sahilmgandhi | 18:6a4db94011d3 | 5 | * you may not use this file except in compliance with the License. |
sahilmgandhi | 18:6a4db94011d3 | 6 | * You may obtain a copy of the License at |
sahilmgandhi | 18:6a4db94011d3 | 7 | * |
sahilmgandhi | 18:6a4db94011d3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 9 | * |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Unless required by applicable law or agreed to in writing, software |
sahilmgandhi | 18:6a4db94011d3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
sahilmgandhi | 18:6a4db94011d3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sahilmgandhi | 18:6a4db94011d3 | 13 | * See the License for the specific language governing permissions and |
sahilmgandhi | 18:6a4db94011d3 | 14 | * limitations under the License. |
sahilmgandhi | 18:6a4db94011d3 | 15 | */ |
sahilmgandhi | 18:6a4db94011d3 | 16 | #include "mbed_assert.h" |
sahilmgandhi | 18:6a4db94011d3 | 17 | #include "i2c_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 18 | #include "cmsis.h" |
sahilmgandhi | 18:6a4db94011d3 | 19 | #include "pinmap.h" |
sahilmgandhi | 18:6a4db94011d3 | 20 | #include "twi_master.h" |
sahilmgandhi | 18:6a4db94011d3 | 21 | #include "mbed_error.h" |
sahilmgandhi | 18:6a4db94011d3 | 22 | |
sahilmgandhi | 18:6a4db94011d3 | 23 | // nRF51822's I2C_0 and SPI_0 (I2C_1, SPI_1 and SPIS1) share the same address. |
sahilmgandhi | 18:6a4db94011d3 | 24 | // They can't be used at the same time. So we use two global variable to track the usage. |
sahilmgandhi | 18:6a4db94011d3 | 25 | // See nRF51822 address information at nRF51822_PS v2.0.pdf - Table 15 Peripheral instance reference |
sahilmgandhi | 18:6a4db94011d3 | 26 | volatile i2c_spi_peripheral_t i2c0_spi0_peripheral = {0, 0, 0, 0}; |
sahilmgandhi | 18:6a4db94011d3 | 27 | volatile i2c_spi_peripheral_t i2c1_spi1_peripheral = {0, 0, 0, 0}; |
sahilmgandhi | 18:6a4db94011d3 | 28 | |
sahilmgandhi | 18:6a4db94011d3 | 29 | void i2c_interface_enable(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 30 | { |
sahilmgandhi | 18:6a4db94011d3 | 31 | obj->i2c->ENABLE = (TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos); |
sahilmgandhi | 18:6a4db94011d3 | 32 | } |
sahilmgandhi | 18:6a4db94011d3 | 33 | |
sahilmgandhi | 18:6a4db94011d3 | 34 | void twi_master_init(i2c_t *obj, PinName sda, PinName scl, int frequency) |
sahilmgandhi | 18:6a4db94011d3 | 35 | { |
sahilmgandhi | 18:6a4db94011d3 | 36 | NRF_GPIO->PIN_CNF[scl] = ((GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 37 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 38 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 39 | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 40 | (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)); |
sahilmgandhi | 18:6a4db94011d3 | 41 | |
sahilmgandhi | 18:6a4db94011d3 | 42 | NRF_GPIO->PIN_CNF[sda] = ((GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 43 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 44 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 45 | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) | |
sahilmgandhi | 18:6a4db94011d3 | 46 | (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)); |
sahilmgandhi | 18:6a4db94011d3 | 47 | |
sahilmgandhi | 18:6a4db94011d3 | 48 | obj->i2c->PSELSCL = scl; |
sahilmgandhi | 18:6a4db94011d3 | 49 | obj->i2c->PSELSDA = sda; |
sahilmgandhi | 18:6a4db94011d3 | 50 | // set default frequency at 100k |
sahilmgandhi | 18:6a4db94011d3 | 51 | i2c_frequency(obj, frequency); |
sahilmgandhi | 18:6a4db94011d3 | 52 | i2c_interface_enable(obj); |
sahilmgandhi | 18:6a4db94011d3 | 53 | } |
sahilmgandhi | 18:6a4db94011d3 | 54 | |
sahilmgandhi | 18:6a4db94011d3 | 55 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
sahilmgandhi | 18:6a4db94011d3 | 56 | { |
sahilmgandhi | 18:6a4db94011d3 | 57 | NRF_TWI_Type *i2c = NULL; |
sahilmgandhi | 18:6a4db94011d3 | 58 | |
sahilmgandhi | 18:6a4db94011d3 | 59 | if (i2c0_spi0_peripheral.usage == I2C_SPI_PERIPHERAL_FOR_I2C && |
sahilmgandhi | 18:6a4db94011d3 | 60 | i2c0_spi0_peripheral.sda_mosi == (uint8_t)sda && |
sahilmgandhi | 18:6a4db94011d3 | 61 | i2c0_spi0_peripheral.scl_miso == (uint8_t)scl) { |
sahilmgandhi | 18:6a4db94011d3 | 62 | // The I2C with the same pins is already initialized |
sahilmgandhi | 18:6a4db94011d3 | 63 | i2c = (NRF_TWI_Type *)I2C_0; |
sahilmgandhi | 18:6a4db94011d3 | 64 | obj->peripheral = 0x1; |
sahilmgandhi | 18:6a4db94011d3 | 65 | } else if (i2c1_spi1_peripheral.usage == I2C_SPI_PERIPHERAL_FOR_I2C && |
sahilmgandhi | 18:6a4db94011d3 | 66 | i2c1_spi1_peripheral.sda_mosi == (uint8_t)sda && |
sahilmgandhi | 18:6a4db94011d3 | 67 | i2c1_spi1_peripheral.scl_miso == (uint8_t)scl) { |
sahilmgandhi | 18:6a4db94011d3 | 68 | // The I2C with the same pins is already initialized |
sahilmgandhi | 18:6a4db94011d3 | 69 | i2c = (NRF_TWI_Type *)I2C_1; |
sahilmgandhi | 18:6a4db94011d3 | 70 | obj->peripheral = 0x2; |
sahilmgandhi | 18:6a4db94011d3 | 71 | } else if (i2c0_spi0_peripheral.usage == 0) { |
sahilmgandhi | 18:6a4db94011d3 | 72 | i2c0_spi0_peripheral.usage = I2C_SPI_PERIPHERAL_FOR_I2C; |
sahilmgandhi | 18:6a4db94011d3 | 73 | i2c0_spi0_peripheral.sda_mosi = (uint8_t)sda; |
sahilmgandhi | 18:6a4db94011d3 | 74 | i2c0_spi0_peripheral.scl_miso = (uint8_t)scl; |
sahilmgandhi | 18:6a4db94011d3 | 75 | |
sahilmgandhi | 18:6a4db94011d3 | 76 | i2c = (NRF_TWI_Type *)I2C_0; |
sahilmgandhi | 18:6a4db94011d3 | 77 | obj->peripheral = 0x1; |
sahilmgandhi | 18:6a4db94011d3 | 78 | } else if (i2c1_spi1_peripheral.usage == 0) { |
sahilmgandhi | 18:6a4db94011d3 | 79 | i2c1_spi1_peripheral.usage = I2C_SPI_PERIPHERAL_FOR_I2C; |
sahilmgandhi | 18:6a4db94011d3 | 80 | i2c1_spi1_peripheral.sda_mosi = (uint8_t)sda; |
sahilmgandhi | 18:6a4db94011d3 | 81 | i2c1_spi1_peripheral.scl_miso = (uint8_t)scl; |
sahilmgandhi | 18:6a4db94011d3 | 82 | |
sahilmgandhi | 18:6a4db94011d3 | 83 | i2c = (NRF_TWI_Type *)I2C_1; |
sahilmgandhi | 18:6a4db94011d3 | 84 | obj->peripheral = 0x2; |
sahilmgandhi | 18:6a4db94011d3 | 85 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 86 | // No available peripheral |
sahilmgandhi | 18:6a4db94011d3 | 87 | error("No available I2C"); |
sahilmgandhi | 18:6a4db94011d3 | 88 | } |
sahilmgandhi | 18:6a4db94011d3 | 89 | |
sahilmgandhi | 18:6a4db94011d3 | 90 | twi_master_init_and_clear(i2c); |
sahilmgandhi | 18:6a4db94011d3 | 91 | |
sahilmgandhi | 18:6a4db94011d3 | 92 | obj->i2c = i2c; |
sahilmgandhi | 18:6a4db94011d3 | 93 | obj->scl = scl; |
sahilmgandhi | 18:6a4db94011d3 | 94 | obj->sda = sda; |
sahilmgandhi | 18:6a4db94011d3 | 95 | obj->i2c->EVENTS_ERROR = 0; |
sahilmgandhi | 18:6a4db94011d3 | 96 | obj->i2c->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; |
sahilmgandhi | 18:6a4db94011d3 | 97 | obj->i2c->POWER = 0; |
sahilmgandhi | 18:6a4db94011d3 | 98 | |
sahilmgandhi | 18:6a4db94011d3 | 99 | for (int i = 0; i<100; i++) { |
sahilmgandhi | 18:6a4db94011d3 | 100 | } |
sahilmgandhi | 18:6a4db94011d3 | 101 | |
sahilmgandhi | 18:6a4db94011d3 | 102 | obj->i2c->POWER = 1; |
sahilmgandhi | 18:6a4db94011d3 | 103 | twi_master_init(obj, sda, scl, 100000); |
sahilmgandhi | 18:6a4db94011d3 | 104 | } |
sahilmgandhi | 18:6a4db94011d3 | 105 | |
sahilmgandhi | 18:6a4db94011d3 | 106 | void i2c_reset(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 107 | { |
sahilmgandhi | 18:6a4db94011d3 | 108 | obj->i2c->EVENTS_ERROR = 0; |
sahilmgandhi | 18:6a4db94011d3 | 109 | obj->i2c->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; |
sahilmgandhi | 18:6a4db94011d3 | 110 | obj->i2c->POWER = 0; |
sahilmgandhi | 18:6a4db94011d3 | 111 | for (int i = 0; i<100; i++) { |
sahilmgandhi | 18:6a4db94011d3 | 112 | } |
sahilmgandhi | 18:6a4db94011d3 | 113 | |
sahilmgandhi | 18:6a4db94011d3 | 114 | obj->i2c->POWER = 1; |
sahilmgandhi | 18:6a4db94011d3 | 115 | twi_master_init(obj, obj->sda, obj->scl, obj->freq); |
sahilmgandhi | 18:6a4db94011d3 | 116 | } |
sahilmgandhi | 18:6a4db94011d3 | 117 | |
sahilmgandhi | 18:6a4db94011d3 | 118 | int i2c_start(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 119 | { |
sahilmgandhi | 18:6a4db94011d3 | 120 | int status = 0; |
sahilmgandhi | 18:6a4db94011d3 | 121 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 122 | obj->address_set = 0; |
sahilmgandhi | 18:6a4db94011d3 | 123 | return status; |
sahilmgandhi | 18:6a4db94011d3 | 124 | } |
sahilmgandhi | 18:6a4db94011d3 | 125 | |
sahilmgandhi | 18:6a4db94011d3 | 126 | int i2c_stop(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 127 | { |
sahilmgandhi | 18:6a4db94011d3 | 128 | int timeOut = 100000; |
sahilmgandhi | 18:6a4db94011d3 | 129 | obj->i2c->EVENTS_STOPPED = 0; |
sahilmgandhi | 18:6a4db94011d3 | 130 | // write the stop bit |
sahilmgandhi | 18:6a4db94011d3 | 131 | obj->i2c->TASKS_STOP = 1; |
sahilmgandhi | 18:6a4db94011d3 | 132 | while (!obj->i2c->EVENTS_STOPPED) { |
sahilmgandhi | 18:6a4db94011d3 | 133 | timeOut--; |
sahilmgandhi | 18:6a4db94011d3 | 134 | if (timeOut<0) { |
sahilmgandhi | 18:6a4db94011d3 | 135 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 136 | } |
sahilmgandhi | 18:6a4db94011d3 | 137 | } |
sahilmgandhi | 18:6a4db94011d3 | 138 | obj->address_set = 0; |
sahilmgandhi | 18:6a4db94011d3 | 139 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 140 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 141 | } |
sahilmgandhi | 18:6a4db94011d3 | 142 | |
sahilmgandhi | 18:6a4db94011d3 | 143 | int i2c_do_write(i2c_t *obj, int value) |
sahilmgandhi | 18:6a4db94011d3 | 144 | { |
sahilmgandhi | 18:6a4db94011d3 | 145 | int timeOut = 100000; |
sahilmgandhi | 18:6a4db94011d3 | 146 | obj->i2c->TXD = value; |
sahilmgandhi | 18:6a4db94011d3 | 147 | while (!obj->i2c->EVENTS_TXDSENT) { |
sahilmgandhi | 18:6a4db94011d3 | 148 | timeOut--; |
sahilmgandhi | 18:6a4db94011d3 | 149 | if (timeOut<0) { |
sahilmgandhi | 18:6a4db94011d3 | 150 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 151 | } |
sahilmgandhi | 18:6a4db94011d3 | 152 | } |
sahilmgandhi | 18:6a4db94011d3 | 153 | obj->i2c->EVENTS_TXDSENT = 0; |
sahilmgandhi | 18:6a4db94011d3 | 154 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 155 | } |
sahilmgandhi | 18:6a4db94011d3 | 156 | |
sahilmgandhi | 18:6a4db94011d3 | 157 | int i2c_do_read(i2c_t *obj, char *data, int last) |
sahilmgandhi | 18:6a4db94011d3 | 158 | { |
sahilmgandhi | 18:6a4db94011d3 | 159 | int timeOut = 100000; |
sahilmgandhi | 18:6a4db94011d3 | 160 | |
sahilmgandhi | 18:6a4db94011d3 | 161 | if (last) { |
sahilmgandhi | 18:6a4db94011d3 | 162 | // To trigger stop task when a byte is received, |
sahilmgandhi | 18:6a4db94011d3 | 163 | // must be set before resume task. |
sahilmgandhi | 18:6a4db94011d3 | 164 | obj->i2c->SHORTS = 2; |
sahilmgandhi | 18:6a4db94011d3 | 165 | } |
sahilmgandhi | 18:6a4db94011d3 | 166 | |
sahilmgandhi | 18:6a4db94011d3 | 167 | obj->i2c->TASKS_RESUME = 1; |
sahilmgandhi | 18:6a4db94011d3 | 168 | |
sahilmgandhi | 18:6a4db94011d3 | 169 | while (!obj->i2c->EVENTS_RXDREADY) { |
sahilmgandhi | 18:6a4db94011d3 | 170 | timeOut--; |
sahilmgandhi | 18:6a4db94011d3 | 171 | if (timeOut<0) { |
sahilmgandhi | 18:6a4db94011d3 | 172 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 173 | } |
sahilmgandhi | 18:6a4db94011d3 | 174 | } |
sahilmgandhi | 18:6a4db94011d3 | 175 | obj->i2c->EVENTS_RXDREADY = 0; |
sahilmgandhi | 18:6a4db94011d3 | 176 | *data = obj->i2c->RXD; |
sahilmgandhi | 18:6a4db94011d3 | 177 | |
sahilmgandhi | 18:6a4db94011d3 | 178 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 179 | } |
sahilmgandhi | 18:6a4db94011d3 | 180 | |
sahilmgandhi | 18:6a4db94011d3 | 181 | void i2c_frequency(i2c_t *obj, int hz) |
sahilmgandhi | 18:6a4db94011d3 | 182 | { |
sahilmgandhi | 18:6a4db94011d3 | 183 | if (hz<250000) { |
sahilmgandhi | 18:6a4db94011d3 | 184 | obj->freq = 100000; |
sahilmgandhi | 18:6a4db94011d3 | 185 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos); |
sahilmgandhi | 18:6a4db94011d3 | 186 | } else if (hz<400000) { |
sahilmgandhi | 18:6a4db94011d3 | 187 | obj->freq = 250000; |
sahilmgandhi | 18:6a4db94011d3 | 188 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K250 << TWI_FREQUENCY_FREQUENCY_Pos); |
sahilmgandhi | 18:6a4db94011d3 | 189 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 190 | obj->freq = 400000; |
sahilmgandhi | 18:6a4db94011d3 | 191 | obj->i2c->FREQUENCY = (TWI_FREQUENCY_FREQUENCY_K400 << TWI_FREQUENCY_FREQUENCY_Pos); |
sahilmgandhi | 18:6a4db94011d3 | 192 | } |
sahilmgandhi | 18:6a4db94011d3 | 193 | } |
sahilmgandhi | 18:6a4db94011d3 | 194 | |
sahilmgandhi | 18:6a4db94011d3 | 195 | int checkError(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 196 | { |
sahilmgandhi | 18:6a4db94011d3 | 197 | if (obj->i2c->EVENTS_ERROR == 1) { |
sahilmgandhi | 18:6a4db94011d3 | 198 | if (obj->i2c->ERRORSRC & TWI_ERRORSRC_ANACK_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 199 | obj->i2c->EVENTS_ERROR = 0; |
sahilmgandhi | 18:6a4db94011d3 | 200 | obj->i2c->TASKS_STOP = 1; |
sahilmgandhi | 18:6a4db94011d3 | 201 | return I2C_ERROR_BUS_BUSY; |
sahilmgandhi | 18:6a4db94011d3 | 202 | } |
sahilmgandhi | 18:6a4db94011d3 | 203 | |
sahilmgandhi | 18:6a4db94011d3 | 204 | obj->i2c->EVENTS_ERROR = 0; |
sahilmgandhi | 18:6a4db94011d3 | 205 | obj->i2c->TASKS_STOP = 1; |
sahilmgandhi | 18:6a4db94011d3 | 206 | return I2C_ERROR_NO_SLAVE; |
sahilmgandhi | 18:6a4db94011d3 | 207 | } |
sahilmgandhi | 18:6a4db94011d3 | 208 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 209 | } |
sahilmgandhi | 18:6a4db94011d3 | 210 | |
sahilmgandhi | 18:6a4db94011d3 | 211 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
sahilmgandhi | 18:6a4db94011d3 | 212 | { |
sahilmgandhi | 18:6a4db94011d3 | 213 | int status, count, errorResult; |
sahilmgandhi | 18:6a4db94011d3 | 214 | obj->i2c->ADDRESS = (address >> 1); |
sahilmgandhi | 18:6a4db94011d3 | 215 | obj->i2c->SHORTS = 1; // to trigger suspend task when a byte is received |
sahilmgandhi | 18:6a4db94011d3 | 216 | obj->i2c->EVENTS_RXDREADY = 0; |
sahilmgandhi | 18:6a4db94011d3 | 217 | obj->i2c->TASKS_STARTRX = 1; |
sahilmgandhi | 18:6a4db94011d3 | 218 | |
sahilmgandhi | 18:6a4db94011d3 | 219 | // Read in all except last byte |
sahilmgandhi | 18:6a4db94011d3 | 220 | for (count = 0; count < (length - 1); count++) { |
sahilmgandhi | 18:6a4db94011d3 | 221 | status = i2c_do_read(obj, &data[count], 0); |
sahilmgandhi | 18:6a4db94011d3 | 222 | if (status) { |
sahilmgandhi | 18:6a4db94011d3 | 223 | errorResult = checkError(obj); |
sahilmgandhi | 18:6a4db94011d3 | 224 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 225 | if (errorResult<0) { |
sahilmgandhi | 18:6a4db94011d3 | 226 | return errorResult; |
sahilmgandhi | 18:6a4db94011d3 | 227 | } |
sahilmgandhi | 18:6a4db94011d3 | 228 | return count; |
sahilmgandhi | 18:6a4db94011d3 | 229 | } |
sahilmgandhi | 18:6a4db94011d3 | 230 | } |
sahilmgandhi | 18:6a4db94011d3 | 231 | |
sahilmgandhi | 18:6a4db94011d3 | 232 | // read in last byte |
sahilmgandhi | 18:6a4db94011d3 | 233 | status = i2c_do_read(obj, &data[length - 1], 1); |
sahilmgandhi | 18:6a4db94011d3 | 234 | if (status) { |
sahilmgandhi | 18:6a4db94011d3 | 235 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 236 | return length - 1; |
sahilmgandhi | 18:6a4db94011d3 | 237 | } |
sahilmgandhi | 18:6a4db94011d3 | 238 | // If not repeated start, send stop. |
sahilmgandhi | 18:6a4db94011d3 | 239 | if (stop) { |
sahilmgandhi | 18:6a4db94011d3 | 240 | while (!obj->i2c->EVENTS_STOPPED) { |
sahilmgandhi | 18:6a4db94011d3 | 241 | } |
sahilmgandhi | 18:6a4db94011d3 | 242 | obj->i2c->EVENTS_STOPPED = 0; |
sahilmgandhi | 18:6a4db94011d3 | 243 | } |
sahilmgandhi | 18:6a4db94011d3 | 244 | return length; |
sahilmgandhi | 18:6a4db94011d3 | 245 | } |
sahilmgandhi | 18:6a4db94011d3 | 246 | |
sahilmgandhi | 18:6a4db94011d3 | 247 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
sahilmgandhi | 18:6a4db94011d3 | 248 | { |
sahilmgandhi | 18:6a4db94011d3 | 249 | int status, errorResult; |
sahilmgandhi | 18:6a4db94011d3 | 250 | obj->i2c->ADDRESS = (address >> 1); |
sahilmgandhi | 18:6a4db94011d3 | 251 | obj->i2c->SHORTS = 0; |
sahilmgandhi | 18:6a4db94011d3 | 252 | obj->i2c->TASKS_STARTTX = 1; |
sahilmgandhi | 18:6a4db94011d3 | 253 | |
sahilmgandhi | 18:6a4db94011d3 | 254 | for (int i = 0; i<length; i++) { |
sahilmgandhi | 18:6a4db94011d3 | 255 | status = i2c_do_write(obj, data[i]); |
sahilmgandhi | 18:6a4db94011d3 | 256 | if (status) { |
sahilmgandhi | 18:6a4db94011d3 | 257 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 258 | errorResult = checkError(obj); |
sahilmgandhi | 18:6a4db94011d3 | 259 | if (errorResult<0) { |
sahilmgandhi | 18:6a4db94011d3 | 260 | return errorResult; |
sahilmgandhi | 18:6a4db94011d3 | 261 | } |
sahilmgandhi | 18:6a4db94011d3 | 262 | return i; |
sahilmgandhi | 18:6a4db94011d3 | 263 | } |
sahilmgandhi | 18:6a4db94011d3 | 264 | } |
sahilmgandhi | 18:6a4db94011d3 | 265 | |
sahilmgandhi | 18:6a4db94011d3 | 266 | // If not repeated start, send stop. |
sahilmgandhi | 18:6a4db94011d3 | 267 | if (stop) { |
sahilmgandhi | 18:6a4db94011d3 | 268 | if (i2c_stop(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 269 | return I2C_ERROR_NO_SLAVE; |
sahilmgandhi | 18:6a4db94011d3 | 270 | } |
sahilmgandhi | 18:6a4db94011d3 | 271 | } |
sahilmgandhi | 18:6a4db94011d3 | 272 | return length; |
sahilmgandhi | 18:6a4db94011d3 | 273 | } |
sahilmgandhi | 18:6a4db94011d3 | 274 | |
sahilmgandhi | 18:6a4db94011d3 | 275 | int i2c_byte_read(i2c_t *obj, int last) |
sahilmgandhi | 18:6a4db94011d3 | 276 | { |
sahilmgandhi | 18:6a4db94011d3 | 277 | char data; |
sahilmgandhi | 18:6a4db94011d3 | 278 | int status; |
sahilmgandhi | 18:6a4db94011d3 | 279 | |
sahilmgandhi | 18:6a4db94011d3 | 280 | status = i2c_do_read(obj, &data, last); |
sahilmgandhi | 18:6a4db94011d3 | 281 | if (status) { |
sahilmgandhi | 18:6a4db94011d3 | 282 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 283 | } |
sahilmgandhi | 18:6a4db94011d3 | 284 | return data; |
sahilmgandhi | 18:6a4db94011d3 | 285 | } |
sahilmgandhi | 18:6a4db94011d3 | 286 | |
sahilmgandhi | 18:6a4db94011d3 | 287 | int i2c_byte_write(i2c_t *obj, int data) |
sahilmgandhi | 18:6a4db94011d3 | 288 | { |
sahilmgandhi | 18:6a4db94011d3 | 289 | int status = 0; |
sahilmgandhi | 18:6a4db94011d3 | 290 | if (!obj->address_set) { |
sahilmgandhi | 18:6a4db94011d3 | 291 | obj->address_set = 1; |
sahilmgandhi | 18:6a4db94011d3 | 292 | obj->i2c->ADDRESS = (data >> 1); |
sahilmgandhi | 18:6a4db94011d3 | 293 | |
sahilmgandhi | 18:6a4db94011d3 | 294 | if (data & 1) { |
sahilmgandhi | 18:6a4db94011d3 | 295 | obj->i2c->EVENTS_RXDREADY = 0; |
sahilmgandhi | 18:6a4db94011d3 | 296 | obj->i2c->SHORTS = 1; |
sahilmgandhi | 18:6a4db94011d3 | 297 | obj->i2c->TASKS_STARTRX = 1; |
sahilmgandhi | 18:6a4db94011d3 | 298 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 299 | obj->i2c->SHORTS = 0; |
sahilmgandhi | 18:6a4db94011d3 | 300 | obj->i2c->TASKS_STARTTX = 1; |
sahilmgandhi | 18:6a4db94011d3 | 301 | } |
sahilmgandhi | 18:6a4db94011d3 | 302 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 303 | status = i2c_do_write(obj, data); |
sahilmgandhi | 18:6a4db94011d3 | 304 | if (status) { |
sahilmgandhi | 18:6a4db94011d3 | 305 | i2c_reset(obj); |
sahilmgandhi | 18:6a4db94011d3 | 306 | } |
sahilmgandhi | 18:6a4db94011d3 | 307 | } |
sahilmgandhi | 18:6a4db94011d3 | 308 | return (1 - status); |
sahilmgandhi | 18:6a4db94011d3 | 309 | } |