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targets/TARGET_NXP/TARGET_LPC11UXX/i2c_api.c@178:d650f5d4c87a, 2017-11-08 (annotated)
- Committer:
- AnnaBridge
- Date:
- Wed Nov 08 13:50:44 2017 +0000
- Revision:
- 178:d650f5d4c87a
- Parent:
- 149:156823d33999
This updates the lib to the mbed lib v 155
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 144:ef7eb2e8f9f7 | 3 | * |
<> | 144:ef7eb2e8f9f7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 144:ef7eb2e8f9f7 | 5 | * you may not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 6 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 144:ef7eb2e8f9f7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 13 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 14 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 15 | */ |
<> | 144:ef7eb2e8f9f7 | 16 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 17 | #include "i2c_api.h" |
<> | 144:ef7eb2e8f9f7 | 18 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 19 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 20 | #include "PeripheralPins.h" // For the Peripheral to Pin Definitions found in the individual Target's Platform |
<> | 144:ef7eb2e8f9f7 | 21 | |
<> | 144:ef7eb2e8f9f7 | 22 | #define I2C_CONSET(x) (x->i2c->CONSET) |
<> | 144:ef7eb2e8f9f7 | 23 | #define I2C_CONCLR(x) (x->i2c->CONCLR) |
<> | 144:ef7eb2e8f9f7 | 24 | #define I2C_STAT(x) (x->i2c->STAT) |
<> | 144:ef7eb2e8f9f7 | 25 | #define I2C_DAT(x) (x->i2c->DAT) |
<> | 144:ef7eb2e8f9f7 | 26 | #define I2C_SCLL(x, val) (x->i2c->SCLL = val) |
<> | 144:ef7eb2e8f9f7 | 27 | #define I2C_SCLH(x, val) (x->i2c->SCLH = val) |
<> | 144:ef7eb2e8f9f7 | 28 | |
<> | 144:ef7eb2e8f9f7 | 29 | static const uint32_t I2C_addr_offset[2][4] = { |
<> | 144:ef7eb2e8f9f7 | 30 | {0x0C, 0x20, 0x24, 0x28}, |
<> | 144:ef7eb2e8f9f7 | 31 | {0x30, 0x34, 0x38, 0x3C} |
<> | 144:ef7eb2e8f9f7 | 32 | }; |
<> | 144:ef7eb2e8f9f7 | 33 | |
<> | 144:ef7eb2e8f9f7 | 34 | static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
<> | 144:ef7eb2e8f9f7 | 35 | I2C_CONCLR(obj) = (start << 5) |
<> | 144:ef7eb2e8f9f7 | 36 | | (stop << 4) |
<> | 144:ef7eb2e8f9f7 | 37 | | (interrupt << 3) |
<> | 144:ef7eb2e8f9f7 | 38 | | (acknowledge << 2); |
<> | 144:ef7eb2e8f9f7 | 39 | } |
<> | 144:ef7eb2e8f9f7 | 40 | |
<> | 144:ef7eb2e8f9f7 | 41 | static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
<> | 144:ef7eb2e8f9f7 | 42 | I2C_CONSET(obj) = (start << 5) |
<> | 144:ef7eb2e8f9f7 | 43 | | (stop << 4) |
<> | 144:ef7eb2e8f9f7 | 44 | | (interrupt << 3) |
<> | 144:ef7eb2e8f9f7 | 45 | | (acknowledge << 2); |
<> | 144:ef7eb2e8f9f7 | 46 | } |
<> | 144:ef7eb2e8f9f7 | 47 | |
<> | 144:ef7eb2e8f9f7 | 48 | // Clear the Serial Interrupt (SI) |
<> | 144:ef7eb2e8f9f7 | 49 | static inline void i2c_clear_SI(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 50 | i2c_conclr(obj, 0, 0, 1, 0); |
<> | 144:ef7eb2e8f9f7 | 51 | } |
<> | 144:ef7eb2e8f9f7 | 52 | |
<> | 144:ef7eb2e8f9f7 | 53 | static inline int i2c_status(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 54 | return I2C_STAT(obj); |
<> | 144:ef7eb2e8f9f7 | 55 | } |
<> | 144:ef7eb2e8f9f7 | 56 | |
<> | 144:ef7eb2e8f9f7 | 57 | // Wait until the Serial Interrupt (SI) is set |
<> | 144:ef7eb2e8f9f7 | 58 | static int i2c_wait_SI(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 59 | int timeout = 0; |
<> | 144:ef7eb2e8f9f7 | 60 | while (!(I2C_CONSET(obj) & (1 << 3))) { |
<> | 144:ef7eb2e8f9f7 | 61 | timeout++; |
<> | 144:ef7eb2e8f9f7 | 62 | if (timeout > 100000) return -1; |
<> | 144:ef7eb2e8f9f7 | 63 | } |
<> | 144:ef7eb2e8f9f7 | 64 | return 0; |
<> | 144:ef7eb2e8f9f7 | 65 | } |
<> | 144:ef7eb2e8f9f7 | 66 | |
<> | 144:ef7eb2e8f9f7 | 67 | static inline void i2c_interface_enable(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 68 | I2C_CONSET(obj) = 0x40; |
<> | 144:ef7eb2e8f9f7 | 69 | } |
<> | 144:ef7eb2e8f9f7 | 70 | |
<> | 144:ef7eb2e8f9f7 | 71 | static inline void i2c_power_enable(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 72 | LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 5); |
<> | 144:ef7eb2e8f9f7 | 73 | LPC_SYSCON->PRESETCTRL |= 1 << 1; |
<> | 144:ef7eb2e8f9f7 | 74 | } |
<> | 144:ef7eb2e8f9f7 | 75 | |
<> | 144:ef7eb2e8f9f7 | 76 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
<> | 144:ef7eb2e8f9f7 | 77 | // determine the SPI to use |
<> | 144:ef7eb2e8f9f7 | 78 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
<> | 144:ef7eb2e8f9f7 | 79 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
<> | 144:ef7eb2e8f9f7 | 80 | obj->i2c = (LPC_I2C_Type *)pinmap_merge(i2c_sda, i2c_scl); |
<> | 144:ef7eb2e8f9f7 | 81 | MBED_ASSERT((int)obj->i2c != NC); |
<> | 144:ef7eb2e8f9f7 | 82 | |
<> | 144:ef7eb2e8f9f7 | 83 | // enable power |
<> | 144:ef7eb2e8f9f7 | 84 | i2c_power_enable(obj); |
<> | 144:ef7eb2e8f9f7 | 85 | |
<> | 144:ef7eb2e8f9f7 | 86 | // set default frequency at 100k |
<> | 144:ef7eb2e8f9f7 | 87 | i2c_frequency(obj, 100000); |
<> | 144:ef7eb2e8f9f7 | 88 | i2c_conclr(obj, 1, 1, 1, 1); |
<> | 144:ef7eb2e8f9f7 | 89 | i2c_interface_enable(obj); |
<> | 144:ef7eb2e8f9f7 | 90 | |
<> | 144:ef7eb2e8f9f7 | 91 | pinmap_pinout(sda, PinMap_I2C_SDA); |
<> | 144:ef7eb2e8f9f7 | 92 | pinmap_pinout(scl, PinMap_I2C_SCL); |
<> | 144:ef7eb2e8f9f7 | 93 | } |
<> | 144:ef7eb2e8f9f7 | 94 | |
<> | 144:ef7eb2e8f9f7 | 95 | inline int i2c_start(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 96 | int status = 0; |
<> | 144:ef7eb2e8f9f7 | 97 | int isInterrupted = I2C_CONSET(obj) & (1 << 3); |
<> | 144:ef7eb2e8f9f7 | 98 | |
<> | 144:ef7eb2e8f9f7 | 99 | // 8.1 Before master mode can be entered, I2CON must be initialised to: |
<> | 144:ef7eb2e8f9f7 | 100 | // - I2EN STA STO SI AA - - |
<> | 144:ef7eb2e8f9f7 | 101 | // - 1 0 0 x x - - |
<> | 144:ef7eb2e8f9f7 | 102 | // if AA = 0, it can't enter slave mode |
<> | 144:ef7eb2e8f9f7 | 103 | i2c_conclr(obj, 1, 1, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 104 | |
<> | 144:ef7eb2e8f9f7 | 105 | // The master mode may now be entered by setting the STA bit |
<> | 144:ef7eb2e8f9f7 | 106 | // this will generate a start condition when the bus becomes free |
<> | 144:ef7eb2e8f9f7 | 107 | i2c_conset(obj, 1, 0, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 108 | // Clearing SI bit when it wasn't set on entry can jump past state |
<> | 144:ef7eb2e8f9f7 | 109 | // 0x10 or 0x08 and erroneously send uninitialized slave address. |
<> | 144:ef7eb2e8f9f7 | 110 | if (isInterrupted) |
<> | 144:ef7eb2e8f9f7 | 111 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 112 | |
<> | 144:ef7eb2e8f9f7 | 113 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 114 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 115 | |
<> | 144:ef7eb2e8f9f7 | 116 | // Clear start bit now that it's transmitted |
<> | 144:ef7eb2e8f9f7 | 117 | i2c_conclr(obj, 1, 0, 0, 0); |
<> | 144:ef7eb2e8f9f7 | 118 | return status; |
<> | 144:ef7eb2e8f9f7 | 119 | } |
<> | 144:ef7eb2e8f9f7 | 120 | |
<> | 144:ef7eb2e8f9f7 | 121 | inline int i2c_stop(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 122 | int timeout = 0; |
<> | 144:ef7eb2e8f9f7 | 123 | |
<> | 144:ef7eb2e8f9f7 | 124 | // write the stop bit |
<> | 144:ef7eb2e8f9f7 | 125 | i2c_conset(obj, 0, 1, 0, 0); |
<> | 144:ef7eb2e8f9f7 | 126 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 127 | |
<> | 144:ef7eb2e8f9f7 | 128 | // wait for STO bit to reset |
<> | 144:ef7eb2e8f9f7 | 129 | while(I2C_CONSET(obj) & (1 << 4)) { |
<> | 144:ef7eb2e8f9f7 | 130 | timeout ++; |
<> | 144:ef7eb2e8f9f7 | 131 | if (timeout > 100000) return 1; |
<> | 144:ef7eb2e8f9f7 | 132 | } |
<> | 144:ef7eb2e8f9f7 | 133 | |
<> | 144:ef7eb2e8f9f7 | 134 | return 0; |
<> | 144:ef7eb2e8f9f7 | 135 | } |
<> | 144:ef7eb2e8f9f7 | 136 | |
<> | 144:ef7eb2e8f9f7 | 137 | |
<> | 144:ef7eb2e8f9f7 | 138 | static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) { |
<> | 144:ef7eb2e8f9f7 | 139 | // write the data |
<> | 144:ef7eb2e8f9f7 | 140 | I2C_DAT(obj) = value; |
<> | 144:ef7eb2e8f9f7 | 141 | |
<> | 144:ef7eb2e8f9f7 | 142 | // clear SI to init a send |
<> | 144:ef7eb2e8f9f7 | 143 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 144 | |
<> | 144:ef7eb2e8f9f7 | 145 | // wait and return status |
<> | 144:ef7eb2e8f9f7 | 146 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 147 | return i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 148 | } |
<> | 144:ef7eb2e8f9f7 | 149 | |
<> | 144:ef7eb2e8f9f7 | 150 | static inline int i2c_do_read(i2c_t *obj, int last) { |
<> | 144:ef7eb2e8f9f7 | 151 | // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack) |
<> | 144:ef7eb2e8f9f7 | 152 | if (last) { |
<> | 144:ef7eb2e8f9f7 | 153 | i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK |
<> | 144:ef7eb2e8f9f7 | 154 | } else { |
<> | 144:ef7eb2e8f9f7 | 155 | i2c_conset(obj, 0, 0, 0, 1); // send a ACK |
<> | 144:ef7eb2e8f9f7 | 156 | } |
<> | 144:ef7eb2e8f9f7 | 157 | |
<> | 144:ef7eb2e8f9f7 | 158 | // accept byte |
<> | 144:ef7eb2e8f9f7 | 159 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 160 | |
<> | 144:ef7eb2e8f9f7 | 161 | // wait for it to arrive |
<> | 144:ef7eb2e8f9f7 | 162 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 163 | |
<> | 144:ef7eb2e8f9f7 | 164 | // return the data |
<> | 144:ef7eb2e8f9f7 | 165 | return (I2C_DAT(obj) & 0xFF); |
<> | 144:ef7eb2e8f9f7 | 166 | } |
<> | 144:ef7eb2e8f9f7 | 167 | |
<> | 144:ef7eb2e8f9f7 | 168 | void i2c_frequency(i2c_t *obj, int hz) { |
<> | 144:ef7eb2e8f9f7 | 169 | // No peripheral clock divider on the M0 |
<> | 144:ef7eb2e8f9f7 | 170 | uint32_t PCLK = SystemCoreClock; |
<> | 144:ef7eb2e8f9f7 | 171 | |
<> | 144:ef7eb2e8f9f7 | 172 | uint32_t pulse = PCLK / (hz * 2); |
<> | 144:ef7eb2e8f9f7 | 173 | |
<> | 144:ef7eb2e8f9f7 | 174 | // I2C Rate |
<> | 144:ef7eb2e8f9f7 | 175 | I2C_SCLL(obj, pulse); |
<> | 144:ef7eb2e8f9f7 | 176 | I2C_SCLH(obj, pulse); |
<> | 144:ef7eb2e8f9f7 | 177 | } |
<> | 144:ef7eb2e8f9f7 | 178 | |
<> | 144:ef7eb2e8f9f7 | 179 | // The I2C does a read or a write as a whole operation |
<> | 144:ef7eb2e8f9f7 | 180 | // There are two types of error conditions it can encounter |
<> | 144:ef7eb2e8f9f7 | 181 | // 1) it can not obtain the bus |
<> | 144:ef7eb2e8f9f7 | 182 | // 2) it gets error responses at part of the transmission |
<> | 144:ef7eb2e8f9f7 | 183 | // |
<> | 144:ef7eb2e8f9f7 | 184 | // We tackle them as follows: |
<> | 144:ef7eb2e8f9f7 | 185 | // 1) we retry until we get the bus. we could have a "timeout" if we can not get it |
<> | 144:ef7eb2e8f9f7 | 186 | // which basically turns it in to a 2) |
<> | 144:ef7eb2e8f9f7 | 187 | // 2) on error, we use the standard error mechanisms to report/debug |
<> | 144:ef7eb2e8f9f7 | 188 | // |
<> | 144:ef7eb2e8f9f7 | 189 | // Therefore an I2C transaction should always complete. If it doesn't it is usually |
<> | 144:ef7eb2e8f9f7 | 190 | // because something is setup wrong (e.g. wiring), and we don't need to programatically |
<> | 144:ef7eb2e8f9f7 | 191 | // check for that |
<> | 144:ef7eb2e8f9f7 | 192 | |
<> | 144:ef7eb2e8f9f7 | 193 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
<> | 144:ef7eb2e8f9f7 | 194 | int count, status; |
<> | 144:ef7eb2e8f9f7 | 195 | |
<> | 144:ef7eb2e8f9f7 | 196 | status = i2c_start(obj); |
<> | 144:ef7eb2e8f9f7 | 197 | |
<> | 144:ef7eb2e8f9f7 | 198 | if ((status != 0x10) && (status != 0x08)) { |
<> | 144:ef7eb2e8f9f7 | 199 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 200 | return I2C_ERROR_BUS_BUSY; |
<> | 144:ef7eb2e8f9f7 | 201 | } |
<> | 144:ef7eb2e8f9f7 | 202 | |
<> | 144:ef7eb2e8f9f7 | 203 | status = i2c_do_write(obj, (address | 0x01), 1); |
<> | 144:ef7eb2e8f9f7 | 204 | if (status != 0x40) { |
<> | 144:ef7eb2e8f9f7 | 205 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 206 | return I2C_ERROR_NO_SLAVE; |
<> | 144:ef7eb2e8f9f7 | 207 | } |
<> | 144:ef7eb2e8f9f7 | 208 | |
<> | 144:ef7eb2e8f9f7 | 209 | // Read in all except last byte |
<> | 144:ef7eb2e8f9f7 | 210 | for (count = 0; count < (length - 1); count++) { |
<> | 144:ef7eb2e8f9f7 | 211 | int value = i2c_do_read(obj, 0); |
<> | 144:ef7eb2e8f9f7 | 212 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 213 | if (status != 0x50) { |
<> | 144:ef7eb2e8f9f7 | 214 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 215 | return count; |
<> | 144:ef7eb2e8f9f7 | 216 | } |
<> | 144:ef7eb2e8f9f7 | 217 | data[count] = (char) value; |
<> | 144:ef7eb2e8f9f7 | 218 | } |
<> | 144:ef7eb2e8f9f7 | 219 | |
<> | 144:ef7eb2e8f9f7 | 220 | // read in last byte |
<> | 144:ef7eb2e8f9f7 | 221 | int value = i2c_do_read(obj, 1); |
<> | 144:ef7eb2e8f9f7 | 222 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 223 | if (status != 0x58) { |
<> | 144:ef7eb2e8f9f7 | 224 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 225 | return length - 1; |
<> | 144:ef7eb2e8f9f7 | 226 | } |
<> | 144:ef7eb2e8f9f7 | 227 | |
<> | 144:ef7eb2e8f9f7 | 228 | data[count] = (char) value; |
<> | 144:ef7eb2e8f9f7 | 229 | |
<> | 144:ef7eb2e8f9f7 | 230 | // If not repeated start, send stop. |
<> | 144:ef7eb2e8f9f7 | 231 | if (stop) { |
<> | 144:ef7eb2e8f9f7 | 232 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 233 | } |
<> | 144:ef7eb2e8f9f7 | 234 | |
<> | 144:ef7eb2e8f9f7 | 235 | return length; |
<> | 144:ef7eb2e8f9f7 | 236 | } |
<> | 144:ef7eb2e8f9f7 | 237 | |
<> | 144:ef7eb2e8f9f7 | 238 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
<> | 144:ef7eb2e8f9f7 | 239 | int i, status; |
<> | 144:ef7eb2e8f9f7 | 240 | |
<> | 144:ef7eb2e8f9f7 | 241 | status = i2c_start(obj); |
<> | 144:ef7eb2e8f9f7 | 242 | |
<> | 144:ef7eb2e8f9f7 | 243 | if ((status != 0x10) && (status != 0x08)) { |
<> | 144:ef7eb2e8f9f7 | 244 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 245 | return I2C_ERROR_BUS_BUSY; |
<> | 144:ef7eb2e8f9f7 | 246 | } |
<> | 144:ef7eb2e8f9f7 | 247 | |
<> | 144:ef7eb2e8f9f7 | 248 | status = i2c_do_write(obj, (address & 0xFE), 1); |
<> | 144:ef7eb2e8f9f7 | 249 | if (status != 0x18) { |
<> | 144:ef7eb2e8f9f7 | 250 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 251 | return I2C_ERROR_NO_SLAVE; |
<> | 144:ef7eb2e8f9f7 | 252 | } |
<> | 144:ef7eb2e8f9f7 | 253 | |
<> | 144:ef7eb2e8f9f7 | 254 | for (i=0; i<length; i++) { |
<> | 144:ef7eb2e8f9f7 | 255 | status = i2c_do_write(obj, data[i], 0); |
<> | 144:ef7eb2e8f9f7 | 256 | if(status != 0x28) { |
<> | 144:ef7eb2e8f9f7 | 257 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 258 | return i; |
<> | 144:ef7eb2e8f9f7 | 259 | } |
<> | 144:ef7eb2e8f9f7 | 260 | } |
<> | 144:ef7eb2e8f9f7 | 261 | |
<> | 144:ef7eb2e8f9f7 | 262 | // clearing the serial interrupt here might cause an unintended rewrite of the last byte |
<> | 144:ef7eb2e8f9f7 | 263 | // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1 |
<> | 144:ef7eb2e8f9f7 | 264 | // i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 265 | |
<> | 144:ef7eb2e8f9f7 | 266 | // If not repeated start, send stop. |
<> | 144:ef7eb2e8f9f7 | 267 | if (stop) { |
<> | 144:ef7eb2e8f9f7 | 268 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 269 | } |
<> | 144:ef7eb2e8f9f7 | 270 | |
<> | 144:ef7eb2e8f9f7 | 271 | return length; |
<> | 144:ef7eb2e8f9f7 | 272 | } |
<> | 144:ef7eb2e8f9f7 | 273 | |
<> | 144:ef7eb2e8f9f7 | 274 | void i2c_reset(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 275 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 276 | } |
<> | 144:ef7eb2e8f9f7 | 277 | |
<> | 144:ef7eb2e8f9f7 | 278 | int i2c_byte_read(i2c_t *obj, int last) { |
<> | 144:ef7eb2e8f9f7 | 279 | return (i2c_do_read(obj, last) & 0xFF); |
<> | 144:ef7eb2e8f9f7 | 280 | } |
<> | 144:ef7eb2e8f9f7 | 281 | |
<> | 144:ef7eb2e8f9f7 | 282 | int i2c_byte_write(i2c_t *obj, int data) { |
<> | 144:ef7eb2e8f9f7 | 283 | int ack; |
<> | 144:ef7eb2e8f9f7 | 284 | int status = i2c_do_write(obj, (data & 0xFF), 0); |
<> | 144:ef7eb2e8f9f7 | 285 | |
<> | 144:ef7eb2e8f9f7 | 286 | switch(status) { |
<> | 144:ef7eb2e8f9f7 | 287 | case 0x18: case 0x28: // Master transmit ACKs |
<> | 144:ef7eb2e8f9f7 | 288 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 289 | break; |
<> | 144:ef7eb2e8f9f7 | 290 | case 0x40: // Master receive address transmitted ACK |
<> | 144:ef7eb2e8f9f7 | 291 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 292 | break; |
<> | 144:ef7eb2e8f9f7 | 293 | case 0xB8: // Slave transmit ACK |
<> | 144:ef7eb2e8f9f7 | 294 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 295 | break; |
<> | 144:ef7eb2e8f9f7 | 296 | default: |
<> | 144:ef7eb2e8f9f7 | 297 | ack = 0; |
<> | 144:ef7eb2e8f9f7 | 298 | break; |
<> | 144:ef7eb2e8f9f7 | 299 | } |
<> | 144:ef7eb2e8f9f7 | 300 | |
<> | 144:ef7eb2e8f9f7 | 301 | return ack; |
<> | 144:ef7eb2e8f9f7 | 302 | } |
<> | 144:ef7eb2e8f9f7 | 303 | |
<> | 144:ef7eb2e8f9f7 | 304 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
<> | 144:ef7eb2e8f9f7 | 305 | if (enable_slave != 0) { |
<> | 144:ef7eb2e8f9f7 | 306 | i2c_conclr(obj, 1, 1, 1, 0); |
<> | 144:ef7eb2e8f9f7 | 307 | i2c_conset(obj, 0, 0, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 308 | } else { |
<> | 144:ef7eb2e8f9f7 | 309 | i2c_conclr(obj, 1, 1, 1, 1); |
<> | 144:ef7eb2e8f9f7 | 310 | } |
<> | 144:ef7eb2e8f9f7 | 311 | } |
<> | 144:ef7eb2e8f9f7 | 312 | |
<> | 144:ef7eb2e8f9f7 | 313 | int i2c_slave_receive(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 314 | int status; |
<> | 144:ef7eb2e8f9f7 | 315 | int retval; |
<> | 144:ef7eb2e8f9f7 | 316 | |
<> | 144:ef7eb2e8f9f7 | 317 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 318 | switch(status) { |
<> | 144:ef7eb2e8f9f7 | 319 | case 0x60: retval = 3; break; |
<> | 144:ef7eb2e8f9f7 | 320 | case 0x70: retval = 2; break; |
<> | 144:ef7eb2e8f9f7 | 321 | case 0xA8: retval = 1; break; |
<> | 144:ef7eb2e8f9f7 | 322 | default : retval = 0; break; |
<> | 144:ef7eb2e8f9f7 | 323 | } |
<> | 144:ef7eb2e8f9f7 | 324 | |
<> | 144:ef7eb2e8f9f7 | 325 | return(retval); |
<> | 144:ef7eb2e8f9f7 | 326 | } |
<> | 144:ef7eb2e8f9f7 | 327 | |
<> | 144:ef7eb2e8f9f7 | 328 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
<> | 144:ef7eb2e8f9f7 | 329 | int count = 0; |
<> | 144:ef7eb2e8f9f7 | 330 | int status; |
<> | 144:ef7eb2e8f9f7 | 331 | |
<> | 144:ef7eb2e8f9f7 | 332 | do { |
<> | 144:ef7eb2e8f9f7 | 333 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 334 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 335 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 336 | if((status == 0x80) || (status == 0x90)) { |
<> | 144:ef7eb2e8f9f7 | 337 | data[count] = I2C_DAT(obj) & 0xFF; |
<> | 144:ef7eb2e8f9f7 | 338 | } |
<> | 144:ef7eb2e8f9f7 | 339 | count++; |
<> | 144:ef7eb2e8f9f7 | 340 | } while (((status == 0x80) || (status == 0x90) || |
<> | 144:ef7eb2e8f9f7 | 341 | (status == 0x060) || (status == 0x70)) && (count < length)); |
<> | 144:ef7eb2e8f9f7 | 342 | |
<> | 144:ef7eb2e8f9f7 | 343 | if(status != 0xA0) { |
<> | 144:ef7eb2e8f9f7 | 344 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 345 | } |
<> | 144:ef7eb2e8f9f7 | 346 | |
<> | 144:ef7eb2e8f9f7 | 347 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 348 | |
<> | 144:ef7eb2e8f9f7 | 349 | return count; |
<> | 144:ef7eb2e8f9f7 | 350 | } |
<> | 144:ef7eb2e8f9f7 | 351 | |
<> | 144:ef7eb2e8f9f7 | 352 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
<> | 144:ef7eb2e8f9f7 | 353 | int count = 0; |
<> | 144:ef7eb2e8f9f7 | 354 | int status; |
<> | 144:ef7eb2e8f9f7 | 355 | |
<> | 144:ef7eb2e8f9f7 | 356 | if(length <= 0) { |
<> | 144:ef7eb2e8f9f7 | 357 | return(0); |
<> | 144:ef7eb2e8f9f7 | 358 | } |
<> | 144:ef7eb2e8f9f7 | 359 | |
<> | 144:ef7eb2e8f9f7 | 360 | do { |
<> | 144:ef7eb2e8f9f7 | 361 | status = i2c_do_write(obj, data[count], 0); |
<> | 144:ef7eb2e8f9f7 | 362 | count++; |
<> | 144:ef7eb2e8f9f7 | 363 | } while ((count < length) && (status == 0xB8)); |
<> | 144:ef7eb2e8f9f7 | 364 | |
<> | 144:ef7eb2e8f9f7 | 365 | if((status != 0xC0) && (status != 0xC8)) { |
<> | 144:ef7eb2e8f9f7 | 366 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 367 | } |
<> | 144:ef7eb2e8f9f7 | 368 | |
<> | 144:ef7eb2e8f9f7 | 369 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 370 | |
<> | 144:ef7eb2e8f9f7 | 371 | return(count); |
<> | 144:ef7eb2e8f9f7 | 372 | } |
<> | 144:ef7eb2e8f9f7 | 373 | |
<> | 144:ef7eb2e8f9f7 | 374 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
<> | 144:ef7eb2e8f9f7 | 375 | uint32_t addr; |
<> | 144:ef7eb2e8f9f7 | 376 | |
<> | 144:ef7eb2e8f9f7 | 377 | if ((idx >= 0) && (idx <= 3)) { |
<> | 144:ef7eb2e8f9f7 | 378 | addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx]; |
<> | 144:ef7eb2e8f9f7 | 379 | *((uint32_t *) addr) = address & 0xFF; |
<> | 144:ef7eb2e8f9f7 | 380 | } |
<> | 144:ef7eb2e8f9f7 | 381 | } |