mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
targets/TARGET_NXP/TARGET_LPC43XX/i2c_api.c@181:96ed750bd169, 2018-01-17 (annotated)
- Committer:
- Anna Bridge
- Date:
- Wed Jan 17 15:23:54 2018 +0000
- Revision:
- 181:96ed750bd169
- Parent:
- 149:156823d33999
mbed-dev libray. Release version 158
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 | * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> |
<> | 144:ef7eb2e8f9f7 | 17 | */ |
<> | 144:ef7eb2e8f9f7 | 18 | #include "i2c_api.h" |
<> | 144:ef7eb2e8f9f7 | 19 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 20 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 21 | #include "mbed_error.h" |
<> | 144:ef7eb2e8f9f7 | 22 | |
<> | 144:ef7eb2e8f9f7 | 23 | // SCU mode for I2C SCL/SDA pins |
<> | 144:ef7eb2e8f9f7 | 24 | #define SCU_PINIO_I2C SCU_PINIO_PULLNONE |
<> | 144:ef7eb2e8f9f7 | 25 | |
<> | 144:ef7eb2e8f9f7 | 26 | static const PinMap PinMap_I2C_SDA[] = { |
<> | 144:ef7eb2e8f9f7 | 27 | {P_DED, I2C_0, 0}, |
<> | 144:ef7eb2e8f9f7 | 28 | {P2_3, I2C_1, (SCU_PINIO_I2C | 1)}, |
<> | 144:ef7eb2e8f9f7 | 29 | {PE_13, I2C_1, (SCU_PINIO_I2C | 2)}, |
<> | 144:ef7eb2e8f9f7 | 30 | {NC, NC, 0} |
<> | 144:ef7eb2e8f9f7 | 31 | }; |
<> | 144:ef7eb2e8f9f7 | 32 | |
<> | 144:ef7eb2e8f9f7 | 33 | static const PinMap PinMap_I2C_SCL[] = { |
<> | 144:ef7eb2e8f9f7 | 34 | {P_DED, I2C_0, 0}, |
<> | 144:ef7eb2e8f9f7 | 35 | {P2_4, I2C_1, (SCU_PINIO_I2C | 1)}, |
<> | 144:ef7eb2e8f9f7 | 36 | {PE_14, I2C_1, (SCU_PINIO_I2C | 2)}, |
<> | 144:ef7eb2e8f9f7 | 37 | {NC, NC, 0} |
<> | 144:ef7eb2e8f9f7 | 38 | }; |
<> | 144:ef7eb2e8f9f7 | 39 | |
<> | 144:ef7eb2e8f9f7 | 40 | #define I2C_CONSET(x) (x->i2c->CONSET) |
<> | 144:ef7eb2e8f9f7 | 41 | #define I2C_CONCLR(x) (x->i2c->CONCLR) |
<> | 144:ef7eb2e8f9f7 | 42 | #define I2C_STAT(x) (x->i2c->STAT) |
<> | 144:ef7eb2e8f9f7 | 43 | #define I2C_DAT(x) (x->i2c->DAT) |
<> | 144:ef7eb2e8f9f7 | 44 | #define I2C_SCLL(x, val) (x->i2c->SCLL = val) |
<> | 144:ef7eb2e8f9f7 | 45 | #define I2C_SCLH(x, val) (x->i2c->SCLH = val) |
<> | 144:ef7eb2e8f9f7 | 46 | |
<> | 144:ef7eb2e8f9f7 | 47 | static const uint32_t I2C_addr_offset[2][4] = { |
<> | 144:ef7eb2e8f9f7 | 48 | {0x0C, 0x20, 0x24, 0x28}, |
<> | 144:ef7eb2e8f9f7 | 49 | {0x30, 0x34, 0x38, 0x3C} |
<> | 144:ef7eb2e8f9f7 | 50 | }; |
<> | 144:ef7eb2e8f9f7 | 51 | |
<> | 144:ef7eb2e8f9f7 | 52 | static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
<> | 144:ef7eb2e8f9f7 | 53 | I2C_CONCLR(obj) = (start << 5) |
<> | 144:ef7eb2e8f9f7 | 54 | | (stop << 4) |
<> | 144:ef7eb2e8f9f7 | 55 | | (interrupt << 3) |
<> | 144:ef7eb2e8f9f7 | 56 | | (acknowledge << 2); |
<> | 144:ef7eb2e8f9f7 | 57 | } |
<> | 144:ef7eb2e8f9f7 | 58 | |
<> | 144:ef7eb2e8f9f7 | 59 | static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
<> | 144:ef7eb2e8f9f7 | 60 | I2C_CONSET(obj) = (start << 5) |
<> | 144:ef7eb2e8f9f7 | 61 | | (stop << 4) |
<> | 144:ef7eb2e8f9f7 | 62 | | (interrupt << 3) |
<> | 144:ef7eb2e8f9f7 | 63 | | (acknowledge << 2); |
<> | 144:ef7eb2e8f9f7 | 64 | } |
<> | 144:ef7eb2e8f9f7 | 65 | |
<> | 144:ef7eb2e8f9f7 | 66 | // Clear the Serial Interrupt (SI) |
<> | 144:ef7eb2e8f9f7 | 67 | static inline void i2c_clear_SI(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 68 | i2c_conclr(obj, 0, 0, 1, 0); |
<> | 144:ef7eb2e8f9f7 | 69 | } |
<> | 144:ef7eb2e8f9f7 | 70 | |
<> | 144:ef7eb2e8f9f7 | 71 | static inline int i2c_status(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 72 | return I2C_STAT(obj); |
<> | 144:ef7eb2e8f9f7 | 73 | } |
<> | 144:ef7eb2e8f9f7 | 74 | |
<> | 144:ef7eb2e8f9f7 | 75 | // Wait until the Serial Interrupt (SI) is set |
<> | 144:ef7eb2e8f9f7 | 76 | static int i2c_wait_SI(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 77 | int timeout = 0; |
<> | 144:ef7eb2e8f9f7 | 78 | while (!(I2C_CONSET(obj) & (1 << 3))) { |
<> | 144:ef7eb2e8f9f7 | 79 | timeout++; |
<> | 144:ef7eb2e8f9f7 | 80 | if (timeout > 100000) return -1; |
<> | 144:ef7eb2e8f9f7 | 81 | } |
<> | 144:ef7eb2e8f9f7 | 82 | return 0; |
<> | 144:ef7eb2e8f9f7 | 83 | } |
<> | 144:ef7eb2e8f9f7 | 84 | |
<> | 144:ef7eb2e8f9f7 | 85 | static inline void i2c_interface_enable(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 86 | I2C_CONSET(obj) = 0x40; |
<> | 144:ef7eb2e8f9f7 | 87 | } |
<> | 144:ef7eb2e8f9f7 | 88 | |
<> | 144:ef7eb2e8f9f7 | 89 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
<> | 144:ef7eb2e8f9f7 | 90 | // determine the SPI to use |
<> | 144:ef7eb2e8f9f7 | 91 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
<> | 144:ef7eb2e8f9f7 | 92 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
<> | 144:ef7eb2e8f9f7 | 93 | obj->i2c = (LPC_I2C_T *)pinmap_merge(i2c_sda, i2c_scl); |
<> | 144:ef7eb2e8f9f7 | 94 | |
<> | 144:ef7eb2e8f9f7 | 95 | if ((int)obj->i2c == NC) { |
<> | 144:ef7eb2e8f9f7 | 96 | error("I2C pin mapping failed"); |
<> | 144:ef7eb2e8f9f7 | 97 | } |
<> | 144:ef7eb2e8f9f7 | 98 | |
<> | 144:ef7eb2e8f9f7 | 99 | // set default frequency at 100k |
<> | 144:ef7eb2e8f9f7 | 100 | i2c_frequency(obj, 100000); |
<> | 144:ef7eb2e8f9f7 | 101 | i2c_conclr(obj, 1, 1, 1, 1); |
<> | 144:ef7eb2e8f9f7 | 102 | i2c_interface_enable(obj); |
<> | 144:ef7eb2e8f9f7 | 103 | |
<> | 144:ef7eb2e8f9f7 | 104 | // Set SCU functions |
<> | 144:ef7eb2e8f9f7 | 105 | if (scl == P_DED) { |
<> | 144:ef7eb2e8f9f7 | 106 | // Enable dedicated I2C0 SDA and SCL pins (open drain) |
<> | 144:ef7eb2e8f9f7 | 107 | LPC_SCU->SFSI2C0 = (1 << 11) | (1 << 3); |
<> | 144:ef7eb2e8f9f7 | 108 | } else { |
<> | 144:ef7eb2e8f9f7 | 109 | pinmap_pinout(sda, PinMap_I2C_SDA); |
<> | 144:ef7eb2e8f9f7 | 110 | pinmap_pinout(scl, PinMap_I2C_SCL); |
<> | 144:ef7eb2e8f9f7 | 111 | } |
<> | 144:ef7eb2e8f9f7 | 112 | } |
<> | 144:ef7eb2e8f9f7 | 113 | |
<> | 144:ef7eb2e8f9f7 | 114 | inline int i2c_start(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 115 | int status = 0; |
<> | 144:ef7eb2e8f9f7 | 116 | int isInterrupted = I2C_CONSET(obj) & (1 << 3); |
<> | 144:ef7eb2e8f9f7 | 117 | |
<> | 144:ef7eb2e8f9f7 | 118 | // 8.1 Before master mode can be entered, I2CON must be initialised to: |
<> | 144:ef7eb2e8f9f7 | 119 | // - I2EN STA STO SI AA - - |
<> | 144:ef7eb2e8f9f7 | 120 | // - 1 0 0 x x - - |
<> | 144:ef7eb2e8f9f7 | 121 | // if AA = 0, it can't enter slave mode |
<> | 144:ef7eb2e8f9f7 | 122 | i2c_conclr(obj, 1, 1, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 123 | |
<> | 144:ef7eb2e8f9f7 | 124 | // The master mode may now be entered by setting the STA bit |
<> | 144:ef7eb2e8f9f7 | 125 | // this will generate a start condition when the bus becomes free |
<> | 144:ef7eb2e8f9f7 | 126 | i2c_conset(obj, 1, 0, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 127 | // Clearing SI bit when it wasn't set on entry can jump past state |
<> | 144:ef7eb2e8f9f7 | 128 | // 0x10 or 0x08 and erroneously send uninitialized slave address. |
<> | 144:ef7eb2e8f9f7 | 129 | if (isInterrupted) |
<> | 144:ef7eb2e8f9f7 | 130 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 131 | |
<> | 144:ef7eb2e8f9f7 | 132 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 133 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 134 | |
<> | 144:ef7eb2e8f9f7 | 135 | // Clear start bit now that it's transmitted |
<> | 144:ef7eb2e8f9f7 | 136 | i2c_conclr(obj, 1, 0, 0, 0); |
<> | 144:ef7eb2e8f9f7 | 137 | return status; |
<> | 144:ef7eb2e8f9f7 | 138 | } |
<> | 144:ef7eb2e8f9f7 | 139 | |
<> | 144:ef7eb2e8f9f7 | 140 | inline int i2c_stop(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 141 | int timeout = 0; |
<> | 144:ef7eb2e8f9f7 | 142 | |
<> | 144:ef7eb2e8f9f7 | 143 | // write the stop bit |
<> | 144:ef7eb2e8f9f7 | 144 | i2c_conset(obj, 0, 1, 0, 0); |
<> | 144:ef7eb2e8f9f7 | 145 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 146 | |
<> | 144:ef7eb2e8f9f7 | 147 | // wait for STO bit to reset |
<> | 144:ef7eb2e8f9f7 | 148 | while(I2C_CONSET(obj) & (1 << 4)) { |
<> | 144:ef7eb2e8f9f7 | 149 | timeout ++; |
<> | 144:ef7eb2e8f9f7 | 150 | if (timeout > 100000) return 1; |
<> | 144:ef7eb2e8f9f7 | 151 | } |
<> | 144:ef7eb2e8f9f7 | 152 | |
<> | 144:ef7eb2e8f9f7 | 153 | return 0; |
<> | 144:ef7eb2e8f9f7 | 154 | } |
<> | 144:ef7eb2e8f9f7 | 155 | |
<> | 144:ef7eb2e8f9f7 | 156 | static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) { |
<> | 144:ef7eb2e8f9f7 | 157 | // write the data |
<> | 144:ef7eb2e8f9f7 | 158 | I2C_DAT(obj) = value; |
<> | 144:ef7eb2e8f9f7 | 159 | |
<> | 144:ef7eb2e8f9f7 | 160 | // clear SI to init a send |
<> | 144:ef7eb2e8f9f7 | 161 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 162 | |
<> | 144:ef7eb2e8f9f7 | 163 | // wait and return status |
<> | 144:ef7eb2e8f9f7 | 164 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 165 | return i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 166 | } |
<> | 144:ef7eb2e8f9f7 | 167 | |
<> | 144:ef7eb2e8f9f7 | 168 | static inline int i2c_do_read(i2c_t *obj, int last) { |
<> | 144:ef7eb2e8f9f7 | 169 | // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack) |
<> | 144:ef7eb2e8f9f7 | 170 | if(last) { |
<> | 144:ef7eb2e8f9f7 | 171 | i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK |
<> | 144:ef7eb2e8f9f7 | 172 | } else { |
<> | 144:ef7eb2e8f9f7 | 173 | i2c_conset(obj, 0, 0, 0, 1); // send a ACK |
<> | 144:ef7eb2e8f9f7 | 174 | } |
<> | 144:ef7eb2e8f9f7 | 175 | |
<> | 144:ef7eb2e8f9f7 | 176 | // accept byte |
<> | 144:ef7eb2e8f9f7 | 177 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 178 | |
<> | 144:ef7eb2e8f9f7 | 179 | // wait for it to arrive |
<> | 144:ef7eb2e8f9f7 | 180 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 181 | |
<> | 144:ef7eb2e8f9f7 | 182 | // return the data |
<> | 144:ef7eb2e8f9f7 | 183 | return (I2C_DAT(obj) & 0xFF); |
<> | 144:ef7eb2e8f9f7 | 184 | } |
<> | 144:ef7eb2e8f9f7 | 185 | |
<> | 144:ef7eb2e8f9f7 | 186 | void i2c_frequency(i2c_t *obj, int hz) { |
<> | 144:ef7eb2e8f9f7 | 187 | // [TODO] set pclk to /4 |
<> | 144:ef7eb2e8f9f7 | 188 | uint32_t PCLK = SystemCoreClock / 4; |
<> | 144:ef7eb2e8f9f7 | 189 | |
<> | 144:ef7eb2e8f9f7 | 190 | uint32_t pulse = PCLK / (hz * 2); |
<> | 144:ef7eb2e8f9f7 | 191 | |
<> | 144:ef7eb2e8f9f7 | 192 | // I2C Rate |
<> | 144:ef7eb2e8f9f7 | 193 | I2C_SCLL(obj, pulse); |
<> | 144:ef7eb2e8f9f7 | 194 | I2C_SCLH(obj, pulse); |
<> | 144:ef7eb2e8f9f7 | 195 | } |
<> | 144:ef7eb2e8f9f7 | 196 | |
<> | 144:ef7eb2e8f9f7 | 197 | // The I2C does a read or a write as a whole operation |
<> | 144:ef7eb2e8f9f7 | 198 | // There are two types of error conditions it can encounter |
<> | 144:ef7eb2e8f9f7 | 199 | // 1) it can not obtain the bus |
<> | 144:ef7eb2e8f9f7 | 200 | // 2) it gets error responses at part of the transmission |
<> | 144:ef7eb2e8f9f7 | 201 | // |
<> | 144:ef7eb2e8f9f7 | 202 | // We tackle them as follows: |
<> | 144:ef7eb2e8f9f7 | 203 | // 1) we retry until we get the bus. we could have a "timeout" if we can not get it |
<> | 144:ef7eb2e8f9f7 | 204 | // which basically turns it in to a 2) |
<> | 144:ef7eb2e8f9f7 | 205 | // 2) on error, we use the standard error mechanisms to report/debug |
<> | 144:ef7eb2e8f9f7 | 206 | // |
<> | 144:ef7eb2e8f9f7 | 207 | // Therefore an I2C transaction should always complete. If it doesn't it is usually |
<> | 144:ef7eb2e8f9f7 | 208 | // because something is setup wrong (e.g. wiring), and we don't need to programatically |
<> | 144:ef7eb2e8f9f7 | 209 | // check for that |
<> | 144:ef7eb2e8f9f7 | 210 | |
<> | 144:ef7eb2e8f9f7 | 211 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
<> | 144:ef7eb2e8f9f7 | 212 | int count, status; |
<> | 144:ef7eb2e8f9f7 | 213 | |
<> | 144:ef7eb2e8f9f7 | 214 | status = i2c_start(obj); |
<> | 144:ef7eb2e8f9f7 | 215 | |
<> | 144:ef7eb2e8f9f7 | 216 | if ((status != 0x10) && (status != 0x08)) { |
<> | 144:ef7eb2e8f9f7 | 217 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 218 | return I2C_ERROR_BUS_BUSY; |
<> | 144:ef7eb2e8f9f7 | 219 | } |
<> | 144:ef7eb2e8f9f7 | 220 | |
<> | 144:ef7eb2e8f9f7 | 221 | status = i2c_do_write(obj, (address | 0x01), 1); |
<> | 144:ef7eb2e8f9f7 | 222 | if (status != 0x40) { |
<> | 144:ef7eb2e8f9f7 | 223 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 224 | return I2C_ERROR_NO_SLAVE; |
<> | 144:ef7eb2e8f9f7 | 225 | } |
<> | 144:ef7eb2e8f9f7 | 226 | |
<> | 144:ef7eb2e8f9f7 | 227 | // Read in all except last byte |
<> | 144:ef7eb2e8f9f7 | 228 | for (count = 0; count < (length - 1); count++) { |
<> | 144:ef7eb2e8f9f7 | 229 | int value = i2c_do_read(obj, 0); |
<> | 144:ef7eb2e8f9f7 | 230 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 231 | if (status != 0x50) { |
<> | 144:ef7eb2e8f9f7 | 232 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 233 | return count; |
<> | 144:ef7eb2e8f9f7 | 234 | } |
<> | 144:ef7eb2e8f9f7 | 235 | data[count] = (char) value; |
<> | 144:ef7eb2e8f9f7 | 236 | } |
<> | 144:ef7eb2e8f9f7 | 237 | |
<> | 144:ef7eb2e8f9f7 | 238 | // read in last byte |
<> | 144:ef7eb2e8f9f7 | 239 | int value = i2c_do_read(obj, 1); |
<> | 144:ef7eb2e8f9f7 | 240 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 241 | if (status != 0x58) { |
<> | 144:ef7eb2e8f9f7 | 242 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 243 | return length - 1; |
<> | 144:ef7eb2e8f9f7 | 244 | } |
<> | 144:ef7eb2e8f9f7 | 245 | |
<> | 144:ef7eb2e8f9f7 | 246 | data[count] = (char) value; |
<> | 144:ef7eb2e8f9f7 | 247 | |
<> | 144:ef7eb2e8f9f7 | 248 | // If not repeated start, send stop. |
<> | 144:ef7eb2e8f9f7 | 249 | if (stop) { |
<> | 144:ef7eb2e8f9f7 | 250 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 251 | } |
<> | 144:ef7eb2e8f9f7 | 252 | |
<> | 144:ef7eb2e8f9f7 | 253 | return length; |
<> | 144:ef7eb2e8f9f7 | 254 | } |
<> | 144:ef7eb2e8f9f7 | 255 | |
<> | 144:ef7eb2e8f9f7 | 256 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
<> | 144:ef7eb2e8f9f7 | 257 | int i, status; |
<> | 144:ef7eb2e8f9f7 | 258 | |
<> | 144:ef7eb2e8f9f7 | 259 | status = i2c_start(obj); |
<> | 144:ef7eb2e8f9f7 | 260 | |
<> | 144:ef7eb2e8f9f7 | 261 | if ((status != 0x10) && (status != 0x08)) { |
<> | 144:ef7eb2e8f9f7 | 262 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 263 | return I2C_ERROR_BUS_BUSY; |
<> | 144:ef7eb2e8f9f7 | 264 | } |
<> | 144:ef7eb2e8f9f7 | 265 | |
<> | 144:ef7eb2e8f9f7 | 266 | status = i2c_do_write(obj, (address & 0xFE), 1); |
<> | 144:ef7eb2e8f9f7 | 267 | if (status != 0x18) { |
<> | 144:ef7eb2e8f9f7 | 268 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 269 | return I2C_ERROR_NO_SLAVE; |
<> | 144:ef7eb2e8f9f7 | 270 | } |
<> | 144:ef7eb2e8f9f7 | 271 | |
<> | 144:ef7eb2e8f9f7 | 272 | for (i=0; i<length; i++) { |
<> | 144:ef7eb2e8f9f7 | 273 | status = i2c_do_write(obj, data[i], 0); |
<> | 144:ef7eb2e8f9f7 | 274 | if(status != 0x28) { |
<> | 144:ef7eb2e8f9f7 | 275 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 276 | return i; |
<> | 144:ef7eb2e8f9f7 | 277 | } |
<> | 144:ef7eb2e8f9f7 | 278 | } |
<> | 144:ef7eb2e8f9f7 | 279 | |
<> | 144:ef7eb2e8f9f7 | 280 | // clearing the serial interrupt here might cause an unintended rewrite of the last byte |
<> | 144:ef7eb2e8f9f7 | 281 | // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1 |
<> | 144:ef7eb2e8f9f7 | 282 | // i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 283 | |
<> | 144:ef7eb2e8f9f7 | 284 | // If not repeated start, send stop. |
<> | 144:ef7eb2e8f9f7 | 285 | if (stop) { |
<> | 144:ef7eb2e8f9f7 | 286 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 287 | } |
<> | 144:ef7eb2e8f9f7 | 288 | |
<> | 144:ef7eb2e8f9f7 | 289 | return length; |
<> | 144:ef7eb2e8f9f7 | 290 | } |
<> | 144:ef7eb2e8f9f7 | 291 | |
<> | 144:ef7eb2e8f9f7 | 292 | void i2c_reset(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 293 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 294 | } |
<> | 144:ef7eb2e8f9f7 | 295 | |
<> | 144:ef7eb2e8f9f7 | 296 | int i2c_byte_read(i2c_t *obj, int last) { |
<> | 144:ef7eb2e8f9f7 | 297 | return (i2c_do_read(obj, last) & 0xFF); |
<> | 144:ef7eb2e8f9f7 | 298 | } |
<> | 144:ef7eb2e8f9f7 | 299 | |
<> | 144:ef7eb2e8f9f7 | 300 | int i2c_byte_write(i2c_t *obj, int data) { |
<> | 144:ef7eb2e8f9f7 | 301 | int ack; |
<> | 144:ef7eb2e8f9f7 | 302 | int status = i2c_do_write(obj, (data & 0xFF), 0); |
<> | 144:ef7eb2e8f9f7 | 303 | |
<> | 144:ef7eb2e8f9f7 | 304 | switch(status) { |
<> | 144:ef7eb2e8f9f7 | 305 | case 0x18: case 0x28: // Master transmit ACKs |
<> | 144:ef7eb2e8f9f7 | 306 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 307 | break; |
<> | 144:ef7eb2e8f9f7 | 308 | case 0x40: // Master receive address transmitted ACK |
<> | 144:ef7eb2e8f9f7 | 309 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 310 | break; |
<> | 144:ef7eb2e8f9f7 | 311 | case 0xB8: // Slave transmit ACK |
<> | 144:ef7eb2e8f9f7 | 312 | ack = 1; |
<> | 144:ef7eb2e8f9f7 | 313 | break; |
<> | 144:ef7eb2e8f9f7 | 314 | default: |
<> | 144:ef7eb2e8f9f7 | 315 | ack = 0; |
<> | 144:ef7eb2e8f9f7 | 316 | break; |
<> | 144:ef7eb2e8f9f7 | 317 | } |
<> | 144:ef7eb2e8f9f7 | 318 | |
<> | 144:ef7eb2e8f9f7 | 319 | return ack; |
<> | 144:ef7eb2e8f9f7 | 320 | } |
<> | 144:ef7eb2e8f9f7 | 321 | |
<> | 144:ef7eb2e8f9f7 | 322 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
<> | 144:ef7eb2e8f9f7 | 323 | if (enable_slave != 0) { |
<> | 144:ef7eb2e8f9f7 | 324 | i2c_conclr(obj, 1, 1, 1, 0); |
<> | 144:ef7eb2e8f9f7 | 325 | i2c_conset(obj, 0, 0, 0, 1); |
<> | 144:ef7eb2e8f9f7 | 326 | } else { |
<> | 144:ef7eb2e8f9f7 | 327 | i2c_conclr(obj, 1, 1, 1, 1); |
<> | 144:ef7eb2e8f9f7 | 328 | } |
<> | 144:ef7eb2e8f9f7 | 329 | } |
<> | 144:ef7eb2e8f9f7 | 330 | |
<> | 144:ef7eb2e8f9f7 | 331 | int i2c_slave_receive(i2c_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 332 | int status; |
<> | 144:ef7eb2e8f9f7 | 333 | int retval; |
<> | 144:ef7eb2e8f9f7 | 334 | |
<> | 144:ef7eb2e8f9f7 | 335 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 336 | switch(status) { |
<> | 144:ef7eb2e8f9f7 | 337 | case 0x60: retval = 3; break; |
<> | 144:ef7eb2e8f9f7 | 338 | case 0x70: retval = 2; break; |
<> | 144:ef7eb2e8f9f7 | 339 | case 0xA8: retval = 1; break; |
<> | 144:ef7eb2e8f9f7 | 340 | default : retval = 0; break; |
<> | 144:ef7eb2e8f9f7 | 341 | } |
<> | 144:ef7eb2e8f9f7 | 342 | |
<> | 144:ef7eb2e8f9f7 | 343 | return(retval); |
<> | 144:ef7eb2e8f9f7 | 344 | } |
<> | 144:ef7eb2e8f9f7 | 345 | |
<> | 144:ef7eb2e8f9f7 | 346 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
<> | 144:ef7eb2e8f9f7 | 347 | int count = 0; |
<> | 144:ef7eb2e8f9f7 | 348 | int status; |
<> | 144:ef7eb2e8f9f7 | 349 | |
<> | 144:ef7eb2e8f9f7 | 350 | do { |
<> | 144:ef7eb2e8f9f7 | 351 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 352 | i2c_wait_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 353 | status = i2c_status(obj); |
<> | 144:ef7eb2e8f9f7 | 354 | if((status == 0x80) || (status == 0x90)) { |
<> | 144:ef7eb2e8f9f7 | 355 | data[count] = I2C_DAT(obj) & 0xFF; |
<> | 144:ef7eb2e8f9f7 | 356 | } |
<> | 144:ef7eb2e8f9f7 | 357 | count++; |
<> | 144:ef7eb2e8f9f7 | 358 | } while (((status == 0x80) || (status == 0x90) || |
<> | 144:ef7eb2e8f9f7 | 359 | (status == 0x060) || (status == 0x70)) && (count < length)); |
<> | 144:ef7eb2e8f9f7 | 360 | |
<> | 144:ef7eb2e8f9f7 | 361 | if(status != 0xA0) { |
<> | 144:ef7eb2e8f9f7 | 362 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 363 | } |
<> | 144:ef7eb2e8f9f7 | 364 | |
<> | 144:ef7eb2e8f9f7 | 365 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 366 | |
<> | 144:ef7eb2e8f9f7 | 367 | return count; |
<> | 144:ef7eb2e8f9f7 | 368 | } |
<> | 144:ef7eb2e8f9f7 | 369 | |
<> | 144:ef7eb2e8f9f7 | 370 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
<> | 144:ef7eb2e8f9f7 | 371 | int count = 0; |
<> | 144:ef7eb2e8f9f7 | 372 | int status; |
<> | 144:ef7eb2e8f9f7 | 373 | |
<> | 144:ef7eb2e8f9f7 | 374 | if(length <= 0) { |
<> | 144:ef7eb2e8f9f7 | 375 | return(0); |
<> | 144:ef7eb2e8f9f7 | 376 | } |
<> | 144:ef7eb2e8f9f7 | 377 | |
<> | 144:ef7eb2e8f9f7 | 378 | do { |
<> | 144:ef7eb2e8f9f7 | 379 | status = i2c_do_write(obj, data[count], 0); |
<> | 144:ef7eb2e8f9f7 | 380 | count++; |
<> | 144:ef7eb2e8f9f7 | 381 | } while ((count < length) && (status == 0xB8)); |
<> | 144:ef7eb2e8f9f7 | 382 | |
<> | 144:ef7eb2e8f9f7 | 383 | if ((status != 0xC0) && (status != 0xC8)) { |
<> | 144:ef7eb2e8f9f7 | 384 | i2c_stop(obj); |
<> | 144:ef7eb2e8f9f7 | 385 | } |
<> | 144:ef7eb2e8f9f7 | 386 | |
<> | 144:ef7eb2e8f9f7 | 387 | i2c_clear_SI(obj); |
<> | 144:ef7eb2e8f9f7 | 388 | |
<> | 144:ef7eb2e8f9f7 | 389 | return(count); |
<> | 144:ef7eb2e8f9f7 | 390 | } |
<> | 144:ef7eb2e8f9f7 | 391 | |
<> | 144:ef7eb2e8f9f7 | 392 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
<> | 144:ef7eb2e8f9f7 | 393 | uint32_t addr; |
<> | 144:ef7eb2e8f9f7 | 394 | |
<> | 144:ef7eb2e8f9f7 | 395 | if ((idx >= 0) && (idx <= 3)) { |
<> | 144:ef7eb2e8f9f7 | 396 | addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx]; |
<> | 144:ef7eb2e8f9f7 | 397 | *((uint32_t *) addr) = address & 0xFF; |
<> | 144:ef7eb2e8f9f7 | 398 | addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx]; |
<> | 144:ef7eb2e8f9f7 | 399 | *((uint32_t *) addr) = mask & 0xFE; |
<> | 144:ef7eb2e8f9f7 | 400 | } |
<> | 144:ef7eb2e8f9f7 | 401 | } |