added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_NXP/TARGET_LPC43XX/i2c_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /* mbed Microcontroller Library |
bogdanm | 0:9b334a45a8ff | 2 | * Copyright (c) 2006-2013 ARM Limited |
bogdanm | 0:9b334a45a8ff | 3 | * |
bogdanm | 0:9b334a45a8ff | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
bogdanm | 0:9b334a45a8ff | 5 | * you may not use this file except in compliance with the License. |
bogdanm | 0:9b334a45a8ff | 6 | * You may obtain a copy of the License at |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
bogdanm | 0:9b334a45a8ff | 9 | * |
bogdanm | 0:9b334a45a8ff | 10 | * Unless required by applicable law or agreed to in writing, software |
bogdanm | 0:9b334a45a8ff | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
bogdanm | 0:9b334a45a8ff | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
bogdanm | 0:9b334a45a8ff | 13 | * See the License for the specific language governing permissions and |
bogdanm | 0:9b334a45a8ff | 14 | * limitations under the License. |
bogdanm | 0:9b334a45a8ff | 15 | * |
bogdanm | 0:9b334a45a8ff | 16 | * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> |
bogdanm | 0:9b334a45a8ff | 17 | */ |
bogdanm | 0:9b334a45a8ff | 18 | #include "i2c_api.h" |
bogdanm | 0:9b334a45a8ff | 19 | #include "cmsis.h" |
bogdanm | 0:9b334a45a8ff | 20 | #include "pinmap.h" |
bogdanm | 0:9b334a45a8ff | 21 | #include "mbed_error.h" |
bogdanm | 0:9b334a45a8ff | 22 | |
bogdanm | 0:9b334a45a8ff | 23 | // SCU mode for I2C SCL/SDA pins |
bogdanm | 0:9b334a45a8ff | 24 | #define SCU_PINIO_I2C SCU_PINIO_PULLNONE |
bogdanm | 0:9b334a45a8ff | 25 | |
bogdanm | 0:9b334a45a8ff | 26 | static const PinMap PinMap_I2C_SDA[] = { |
bogdanm | 0:9b334a45a8ff | 27 | {P_DED, I2C_0, 0}, |
bogdanm | 0:9b334a45a8ff | 28 | {P2_3, I2C_1, (SCU_PINIO_I2C | 1)}, |
bogdanm | 0:9b334a45a8ff | 29 | {PE_13, I2C_1, (SCU_PINIO_I2C | 2)}, |
bogdanm | 0:9b334a45a8ff | 30 | {NC, NC, 0} |
bogdanm | 0:9b334a45a8ff | 31 | }; |
bogdanm | 0:9b334a45a8ff | 32 | |
bogdanm | 0:9b334a45a8ff | 33 | static const PinMap PinMap_I2C_SCL[] = { |
bogdanm | 0:9b334a45a8ff | 34 | {P_DED, I2C_0, 0}, |
bogdanm | 0:9b334a45a8ff | 35 | {P2_4, I2C_1, (SCU_PINIO_I2C | 1)}, |
bogdanm | 0:9b334a45a8ff | 36 | {PE_14, I2C_1, (SCU_PINIO_I2C | 2)}, |
bogdanm | 0:9b334a45a8ff | 37 | {NC, NC, 0} |
bogdanm | 0:9b334a45a8ff | 38 | }; |
bogdanm | 0:9b334a45a8ff | 39 | |
bogdanm | 0:9b334a45a8ff | 40 | #define I2C_CONSET(x) (x->i2c->CONSET) |
bogdanm | 0:9b334a45a8ff | 41 | #define I2C_CONCLR(x) (x->i2c->CONCLR) |
bogdanm | 0:9b334a45a8ff | 42 | #define I2C_STAT(x) (x->i2c->STAT) |
bogdanm | 0:9b334a45a8ff | 43 | #define I2C_DAT(x) (x->i2c->DAT) |
bogdanm | 0:9b334a45a8ff | 44 | #define I2C_SCLL(x, val) (x->i2c->SCLL = val) |
bogdanm | 0:9b334a45a8ff | 45 | #define I2C_SCLH(x, val) (x->i2c->SCLH = val) |
bogdanm | 0:9b334a45a8ff | 46 | |
bogdanm | 0:9b334a45a8ff | 47 | static const uint32_t I2C_addr_offset[2][4] = { |
bogdanm | 0:9b334a45a8ff | 48 | {0x0C, 0x20, 0x24, 0x28}, |
bogdanm | 0:9b334a45a8ff | 49 | {0x30, 0x34, 0x38, 0x3C} |
bogdanm | 0:9b334a45a8ff | 50 | }; |
bogdanm | 0:9b334a45a8ff | 51 | |
bogdanm | 0:9b334a45a8ff | 52 | static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
bogdanm | 0:9b334a45a8ff | 53 | I2C_CONCLR(obj) = (start << 5) |
bogdanm | 0:9b334a45a8ff | 54 | | (stop << 4) |
bogdanm | 0:9b334a45a8ff | 55 | | (interrupt << 3) |
bogdanm | 0:9b334a45a8ff | 56 | | (acknowledge << 2); |
bogdanm | 0:9b334a45a8ff | 57 | } |
bogdanm | 0:9b334a45a8ff | 58 | |
bogdanm | 0:9b334a45a8ff | 59 | static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) { |
bogdanm | 0:9b334a45a8ff | 60 | I2C_CONSET(obj) = (start << 5) |
bogdanm | 0:9b334a45a8ff | 61 | | (stop << 4) |
bogdanm | 0:9b334a45a8ff | 62 | | (interrupt << 3) |
bogdanm | 0:9b334a45a8ff | 63 | | (acknowledge << 2); |
bogdanm | 0:9b334a45a8ff | 64 | } |
bogdanm | 0:9b334a45a8ff | 65 | |
bogdanm | 0:9b334a45a8ff | 66 | // Clear the Serial Interrupt (SI) |
bogdanm | 0:9b334a45a8ff | 67 | static inline void i2c_clear_SI(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 68 | i2c_conclr(obj, 0, 0, 1, 0); |
bogdanm | 0:9b334a45a8ff | 69 | } |
bogdanm | 0:9b334a45a8ff | 70 | |
bogdanm | 0:9b334a45a8ff | 71 | static inline int i2c_status(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 72 | return I2C_STAT(obj); |
bogdanm | 0:9b334a45a8ff | 73 | } |
bogdanm | 0:9b334a45a8ff | 74 | |
bogdanm | 0:9b334a45a8ff | 75 | // Wait until the Serial Interrupt (SI) is set |
bogdanm | 0:9b334a45a8ff | 76 | static int i2c_wait_SI(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 77 | int timeout = 0; |
bogdanm | 0:9b334a45a8ff | 78 | while (!(I2C_CONSET(obj) & (1 << 3))) { |
bogdanm | 0:9b334a45a8ff | 79 | timeout++; |
bogdanm | 0:9b334a45a8ff | 80 | if (timeout > 100000) return -1; |
bogdanm | 0:9b334a45a8ff | 81 | } |
bogdanm | 0:9b334a45a8ff | 82 | return 0; |
bogdanm | 0:9b334a45a8ff | 83 | } |
bogdanm | 0:9b334a45a8ff | 84 | |
bogdanm | 0:9b334a45a8ff | 85 | static inline void i2c_interface_enable(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 86 | I2C_CONSET(obj) = 0x40; |
bogdanm | 0:9b334a45a8ff | 87 | } |
bogdanm | 0:9b334a45a8ff | 88 | |
bogdanm | 0:9b334a45a8ff | 89 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
bogdanm | 0:9b334a45a8ff | 90 | // determine the SPI to use |
bogdanm | 0:9b334a45a8ff | 91 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
bogdanm | 0:9b334a45a8ff | 92 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
bogdanm | 0:9b334a45a8ff | 93 | obj->i2c = (LPC_I2C_T *)pinmap_merge(i2c_sda, i2c_scl); |
bogdanm | 0:9b334a45a8ff | 94 | |
bogdanm | 0:9b334a45a8ff | 95 | if ((int)obj->i2c == NC) { |
bogdanm | 0:9b334a45a8ff | 96 | error("I2C pin mapping failed"); |
bogdanm | 0:9b334a45a8ff | 97 | } |
bogdanm | 0:9b334a45a8ff | 98 | |
bogdanm | 0:9b334a45a8ff | 99 | // set default frequency at 100k |
bogdanm | 0:9b334a45a8ff | 100 | i2c_frequency(obj, 100000); |
bogdanm | 0:9b334a45a8ff | 101 | i2c_conclr(obj, 1, 1, 1, 1); |
bogdanm | 0:9b334a45a8ff | 102 | i2c_interface_enable(obj); |
bogdanm | 0:9b334a45a8ff | 103 | |
bogdanm | 0:9b334a45a8ff | 104 | // Set SCU functions |
bogdanm | 0:9b334a45a8ff | 105 | if (scl == P_DED) { |
bogdanm | 0:9b334a45a8ff | 106 | // Enable dedicated I2C0 SDA and SCL pins (open drain) |
bogdanm | 0:9b334a45a8ff | 107 | LPC_SCU->SFSI2C0 = (1 << 11) | (1 << 3); |
bogdanm | 0:9b334a45a8ff | 108 | } else { |
bogdanm | 0:9b334a45a8ff | 109 | pinmap_pinout(sda, PinMap_I2C_SDA); |
bogdanm | 0:9b334a45a8ff | 110 | pinmap_pinout(scl, PinMap_I2C_SCL); |
bogdanm | 0:9b334a45a8ff | 111 | } |
bogdanm | 0:9b334a45a8ff | 112 | } |
bogdanm | 0:9b334a45a8ff | 113 | |
bogdanm | 0:9b334a45a8ff | 114 | inline int i2c_start(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 115 | int status = 0; |
bogdanm | 0:9b334a45a8ff | 116 | // 8.1 Before master mode can be entered, I2CON must be initialised to: |
bogdanm | 0:9b334a45a8ff | 117 | // - I2EN STA STO SI AA - - |
bogdanm | 0:9b334a45a8ff | 118 | // - 1 0 0 0 x - - |
bogdanm | 0:9b334a45a8ff | 119 | // if AA = 0, it can't enter slave mode |
bogdanm | 0:9b334a45a8ff | 120 | i2c_conclr(obj, 1, 1, 1, 1); |
bogdanm | 0:9b334a45a8ff | 121 | |
bogdanm | 0:9b334a45a8ff | 122 | // The master mode may now be entered by setting the STA bit |
bogdanm | 0:9b334a45a8ff | 123 | // this will generate a start condition when the bus becomes free |
bogdanm | 0:9b334a45a8ff | 124 | i2c_conset(obj, 1, 0, 0, 1); |
bogdanm | 0:9b334a45a8ff | 125 | |
bogdanm | 0:9b334a45a8ff | 126 | i2c_wait_SI(obj); |
bogdanm | 0:9b334a45a8ff | 127 | status = i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 128 | |
bogdanm | 0:9b334a45a8ff | 129 | // Clear start bit now transmitted, and interrupt bit |
bogdanm | 0:9b334a45a8ff | 130 | i2c_conclr(obj, 1, 0, 0, 0); |
bogdanm | 0:9b334a45a8ff | 131 | return status; |
bogdanm | 0:9b334a45a8ff | 132 | } |
bogdanm | 0:9b334a45a8ff | 133 | |
bogdanm | 0:9b334a45a8ff | 134 | inline int i2c_stop(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 135 | int timeout = 0; |
bogdanm | 0:9b334a45a8ff | 136 | |
bogdanm | 0:9b334a45a8ff | 137 | // write the stop bit |
bogdanm | 0:9b334a45a8ff | 138 | i2c_conset(obj, 0, 1, 0, 0); |
bogdanm | 0:9b334a45a8ff | 139 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 140 | |
bogdanm | 0:9b334a45a8ff | 141 | // wait for STO bit to reset |
bogdanm | 0:9b334a45a8ff | 142 | while(I2C_CONSET(obj) & (1 << 4)) { |
bogdanm | 0:9b334a45a8ff | 143 | timeout ++; |
bogdanm | 0:9b334a45a8ff | 144 | if (timeout > 100000) return 1; |
bogdanm | 0:9b334a45a8ff | 145 | } |
bogdanm | 0:9b334a45a8ff | 146 | |
bogdanm | 0:9b334a45a8ff | 147 | return 0; |
bogdanm | 0:9b334a45a8ff | 148 | } |
bogdanm | 0:9b334a45a8ff | 149 | |
bogdanm | 0:9b334a45a8ff | 150 | static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) { |
bogdanm | 0:9b334a45a8ff | 151 | // write the data |
bogdanm | 0:9b334a45a8ff | 152 | I2C_DAT(obj) = value; |
bogdanm | 0:9b334a45a8ff | 153 | |
bogdanm | 0:9b334a45a8ff | 154 | // clear SI to init a send |
bogdanm | 0:9b334a45a8ff | 155 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 156 | |
bogdanm | 0:9b334a45a8ff | 157 | // wait and return status |
bogdanm | 0:9b334a45a8ff | 158 | i2c_wait_SI(obj); |
bogdanm | 0:9b334a45a8ff | 159 | return i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 160 | } |
bogdanm | 0:9b334a45a8ff | 161 | |
bogdanm | 0:9b334a45a8ff | 162 | static inline int i2c_do_read(i2c_t *obj, int last) { |
bogdanm | 0:9b334a45a8ff | 163 | // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack) |
bogdanm | 0:9b334a45a8ff | 164 | if(last) { |
bogdanm | 0:9b334a45a8ff | 165 | i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK |
bogdanm | 0:9b334a45a8ff | 166 | } else { |
bogdanm | 0:9b334a45a8ff | 167 | i2c_conset(obj, 0, 0, 0, 1); // send a ACK |
bogdanm | 0:9b334a45a8ff | 168 | } |
bogdanm | 0:9b334a45a8ff | 169 | |
bogdanm | 0:9b334a45a8ff | 170 | // accept byte |
bogdanm | 0:9b334a45a8ff | 171 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 172 | |
bogdanm | 0:9b334a45a8ff | 173 | // wait for it to arrive |
bogdanm | 0:9b334a45a8ff | 174 | i2c_wait_SI(obj); |
bogdanm | 0:9b334a45a8ff | 175 | |
bogdanm | 0:9b334a45a8ff | 176 | // return the data |
bogdanm | 0:9b334a45a8ff | 177 | return (I2C_DAT(obj) & 0xFF); |
bogdanm | 0:9b334a45a8ff | 178 | } |
bogdanm | 0:9b334a45a8ff | 179 | |
bogdanm | 0:9b334a45a8ff | 180 | void i2c_frequency(i2c_t *obj, int hz) { |
bogdanm | 0:9b334a45a8ff | 181 | // [TODO] set pclk to /4 |
bogdanm | 0:9b334a45a8ff | 182 | uint32_t PCLK = SystemCoreClock / 4; |
bogdanm | 0:9b334a45a8ff | 183 | |
bogdanm | 0:9b334a45a8ff | 184 | uint32_t pulse = PCLK / (hz * 2); |
bogdanm | 0:9b334a45a8ff | 185 | |
bogdanm | 0:9b334a45a8ff | 186 | // I2C Rate |
bogdanm | 0:9b334a45a8ff | 187 | I2C_SCLL(obj, pulse); |
bogdanm | 0:9b334a45a8ff | 188 | I2C_SCLH(obj, pulse); |
bogdanm | 0:9b334a45a8ff | 189 | } |
bogdanm | 0:9b334a45a8ff | 190 | |
bogdanm | 0:9b334a45a8ff | 191 | // The I2C does a read or a write as a whole operation |
bogdanm | 0:9b334a45a8ff | 192 | // There are two types of error conditions it can encounter |
bogdanm | 0:9b334a45a8ff | 193 | // 1) it can not obtain the bus |
bogdanm | 0:9b334a45a8ff | 194 | // 2) it gets error responses at part of the transmission |
bogdanm | 0:9b334a45a8ff | 195 | // |
bogdanm | 0:9b334a45a8ff | 196 | // We tackle them as follows: |
bogdanm | 0:9b334a45a8ff | 197 | // 1) we retry until we get the bus. we could have a "timeout" if we can not get it |
bogdanm | 0:9b334a45a8ff | 198 | // which basically turns it in to a 2) |
bogdanm | 0:9b334a45a8ff | 199 | // 2) on error, we use the standard error mechanisms to report/debug |
bogdanm | 0:9b334a45a8ff | 200 | // |
bogdanm | 0:9b334a45a8ff | 201 | // Therefore an I2C transaction should always complete. If it doesn't it is usually |
bogdanm | 0:9b334a45a8ff | 202 | // because something is setup wrong (e.g. wiring), and we don't need to programatically |
bogdanm | 0:9b334a45a8ff | 203 | // check for that |
bogdanm | 0:9b334a45a8ff | 204 | |
bogdanm | 0:9b334a45a8ff | 205 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
bogdanm | 0:9b334a45a8ff | 206 | int count, status; |
bogdanm | 0:9b334a45a8ff | 207 | |
bogdanm | 0:9b334a45a8ff | 208 | status = i2c_start(obj); |
bogdanm | 0:9b334a45a8ff | 209 | |
bogdanm | 0:9b334a45a8ff | 210 | if ((status != 0x10) && (status != 0x08)) { |
bogdanm | 0:9b334a45a8ff | 211 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 212 | return I2C_ERROR_BUS_BUSY; |
bogdanm | 0:9b334a45a8ff | 213 | } |
bogdanm | 0:9b334a45a8ff | 214 | |
bogdanm | 0:9b334a45a8ff | 215 | status = i2c_do_write(obj, (address | 0x01), 1); |
bogdanm | 0:9b334a45a8ff | 216 | if (status != 0x40) { |
bogdanm | 0:9b334a45a8ff | 217 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 218 | return I2C_ERROR_NO_SLAVE; |
bogdanm | 0:9b334a45a8ff | 219 | } |
bogdanm | 0:9b334a45a8ff | 220 | |
bogdanm | 0:9b334a45a8ff | 221 | // Read in all except last byte |
bogdanm | 0:9b334a45a8ff | 222 | for (count = 0; count < (length - 1); count++) { |
bogdanm | 0:9b334a45a8ff | 223 | int value = i2c_do_read(obj, 0); |
bogdanm | 0:9b334a45a8ff | 224 | status = i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 225 | if (status != 0x50) { |
bogdanm | 0:9b334a45a8ff | 226 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 227 | return count; |
bogdanm | 0:9b334a45a8ff | 228 | } |
bogdanm | 0:9b334a45a8ff | 229 | data[count] = (char) value; |
bogdanm | 0:9b334a45a8ff | 230 | } |
bogdanm | 0:9b334a45a8ff | 231 | |
bogdanm | 0:9b334a45a8ff | 232 | // read in last byte |
bogdanm | 0:9b334a45a8ff | 233 | int value = i2c_do_read(obj, 1); |
bogdanm | 0:9b334a45a8ff | 234 | status = i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 235 | if (status != 0x58) { |
bogdanm | 0:9b334a45a8ff | 236 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 237 | return length - 1; |
bogdanm | 0:9b334a45a8ff | 238 | } |
bogdanm | 0:9b334a45a8ff | 239 | |
bogdanm | 0:9b334a45a8ff | 240 | data[count] = (char) value; |
bogdanm | 0:9b334a45a8ff | 241 | |
bogdanm | 0:9b334a45a8ff | 242 | // If not repeated start, send stop. |
bogdanm | 0:9b334a45a8ff | 243 | if (stop) { |
bogdanm | 0:9b334a45a8ff | 244 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 245 | } |
bogdanm | 0:9b334a45a8ff | 246 | |
bogdanm | 0:9b334a45a8ff | 247 | return length; |
bogdanm | 0:9b334a45a8ff | 248 | } |
bogdanm | 0:9b334a45a8ff | 249 | |
bogdanm | 0:9b334a45a8ff | 250 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
bogdanm | 0:9b334a45a8ff | 251 | int i, status; |
bogdanm | 0:9b334a45a8ff | 252 | |
bogdanm | 0:9b334a45a8ff | 253 | status = i2c_start(obj); |
bogdanm | 0:9b334a45a8ff | 254 | |
bogdanm | 0:9b334a45a8ff | 255 | if ((status != 0x10) && (status != 0x08)) { |
bogdanm | 0:9b334a45a8ff | 256 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 257 | return I2C_ERROR_BUS_BUSY; |
bogdanm | 0:9b334a45a8ff | 258 | } |
bogdanm | 0:9b334a45a8ff | 259 | |
bogdanm | 0:9b334a45a8ff | 260 | status = i2c_do_write(obj, (address & 0xFE), 1); |
bogdanm | 0:9b334a45a8ff | 261 | if (status != 0x18) { |
bogdanm | 0:9b334a45a8ff | 262 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 263 | return I2C_ERROR_NO_SLAVE; |
bogdanm | 0:9b334a45a8ff | 264 | } |
bogdanm | 0:9b334a45a8ff | 265 | |
bogdanm | 0:9b334a45a8ff | 266 | for (i=0; i<length; i++) { |
bogdanm | 0:9b334a45a8ff | 267 | status = i2c_do_write(obj, data[i], 0); |
bogdanm | 0:9b334a45a8ff | 268 | if(status != 0x28) { |
bogdanm | 0:9b334a45a8ff | 269 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 270 | return i; |
bogdanm | 0:9b334a45a8ff | 271 | } |
bogdanm | 0:9b334a45a8ff | 272 | } |
bogdanm | 0:9b334a45a8ff | 273 | |
bogdanm | 0:9b334a45a8ff | 274 | // clearing the serial interrupt here might cause an unintended rewrite of the last byte |
bogdanm | 0:9b334a45a8ff | 275 | // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1 |
bogdanm | 0:9b334a45a8ff | 276 | // i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 277 | |
bogdanm | 0:9b334a45a8ff | 278 | // If not repeated start, send stop. |
bogdanm | 0:9b334a45a8ff | 279 | if (stop) { |
bogdanm | 0:9b334a45a8ff | 280 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 281 | } |
bogdanm | 0:9b334a45a8ff | 282 | |
bogdanm | 0:9b334a45a8ff | 283 | return length; |
bogdanm | 0:9b334a45a8ff | 284 | } |
bogdanm | 0:9b334a45a8ff | 285 | |
bogdanm | 0:9b334a45a8ff | 286 | void i2c_reset(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 287 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 288 | } |
bogdanm | 0:9b334a45a8ff | 289 | |
bogdanm | 0:9b334a45a8ff | 290 | int i2c_byte_read(i2c_t *obj, int last) { |
bogdanm | 0:9b334a45a8ff | 291 | return (i2c_do_read(obj, last) & 0xFF); |
bogdanm | 0:9b334a45a8ff | 292 | } |
bogdanm | 0:9b334a45a8ff | 293 | |
bogdanm | 0:9b334a45a8ff | 294 | int i2c_byte_write(i2c_t *obj, int data) { |
bogdanm | 0:9b334a45a8ff | 295 | int ack; |
bogdanm | 0:9b334a45a8ff | 296 | int status = i2c_do_write(obj, (data & 0xFF), 0); |
bogdanm | 0:9b334a45a8ff | 297 | |
bogdanm | 0:9b334a45a8ff | 298 | switch(status) { |
bogdanm | 0:9b334a45a8ff | 299 | case 0x18: case 0x28: // Master transmit ACKs |
bogdanm | 0:9b334a45a8ff | 300 | ack = 1; |
bogdanm | 0:9b334a45a8ff | 301 | break; |
bogdanm | 0:9b334a45a8ff | 302 | case 0x40: // Master receive address transmitted ACK |
bogdanm | 0:9b334a45a8ff | 303 | ack = 1; |
bogdanm | 0:9b334a45a8ff | 304 | break; |
bogdanm | 0:9b334a45a8ff | 305 | case 0xB8: // Slave transmit ACK |
bogdanm | 0:9b334a45a8ff | 306 | ack = 1; |
bogdanm | 0:9b334a45a8ff | 307 | break; |
bogdanm | 0:9b334a45a8ff | 308 | default: |
bogdanm | 0:9b334a45a8ff | 309 | ack = 0; |
bogdanm | 0:9b334a45a8ff | 310 | break; |
bogdanm | 0:9b334a45a8ff | 311 | } |
bogdanm | 0:9b334a45a8ff | 312 | |
bogdanm | 0:9b334a45a8ff | 313 | return ack; |
bogdanm | 0:9b334a45a8ff | 314 | } |
bogdanm | 0:9b334a45a8ff | 315 | |
bogdanm | 0:9b334a45a8ff | 316 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
bogdanm | 0:9b334a45a8ff | 317 | if (enable_slave != 0) { |
bogdanm | 0:9b334a45a8ff | 318 | i2c_conclr(obj, 1, 1, 1, 0); |
bogdanm | 0:9b334a45a8ff | 319 | i2c_conset(obj, 0, 0, 0, 1); |
bogdanm | 0:9b334a45a8ff | 320 | } else { |
bogdanm | 0:9b334a45a8ff | 321 | i2c_conclr(obj, 1, 1, 1, 1); |
bogdanm | 0:9b334a45a8ff | 322 | } |
bogdanm | 0:9b334a45a8ff | 323 | } |
bogdanm | 0:9b334a45a8ff | 324 | |
bogdanm | 0:9b334a45a8ff | 325 | int i2c_slave_receive(i2c_t *obj) { |
bogdanm | 0:9b334a45a8ff | 326 | int status; |
bogdanm | 0:9b334a45a8ff | 327 | int retval; |
bogdanm | 0:9b334a45a8ff | 328 | |
bogdanm | 0:9b334a45a8ff | 329 | status = i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 330 | switch(status) { |
bogdanm | 0:9b334a45a8ff | 331 | case 0x60: retval = 3; break; |
bogdanm | 0:9b334a45a8ff | 332 | case 0x70: retval = 2; break; |
bogdanm | 0:9b334a45a8ff | 333 | case 0xA8: retval = 1; break; |
bogdanm | 0:9b334a45a8ff | 334 | default : retval = 0; break; |
bogdanm | 0:9b334a45a8ff | 335 | } |
bogdanm | 0:9b334a45a8ff | 336 | |
bogdanm | 0:9b334a45a8ff | 337 | return(retval); |
bogdanm | 0:9b334a45a8ff | 338 | } |
bogdanm | 0:9b334a45a8ff | 339 | |
bogdanm | 0:9b334a45a8ff | 340 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
bogdanm | 0:9b334a45a8ff | 341 | int count = 0; |
bogdanm | 0:9b334a45a8ff | 342 | int status; |
bogdanm | 0:9b334a45a8ff | 343 | |
bogdanm | 0:9b334a45a8ff | 344 | do { |
bogdanm | 0:9b334a45a8ff | 345 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 346 | i2c_wait_SI(obj); |
bogdanm | 0:9b334a45a8ff | 347 | status = i2c_status(obj); |
bogdanm | 0:9b334a45a8ff | 348 | if((status == 0x80) || (status == 0x90)) { |
bogdanm | 0:9b334a45a8ff | 349 | data[count] = I2C_DAT(obj) & 0xFF; |
bogdanm | 0:9b334a45a8ff | 350 | } |
bogdanm | 0:9b334a45a8ff | 351 | count++; |
bogdanm | 0:9b334a45a8ff | 352 | } while (((status == 0x80) || (status == 0x90) || |
bogdanm | 0:9b334a45a8ff | 353 | (status == 0x060) || (status == 0x70)) && (count < length)); |
bogdanm | 0:9b334a45a8ff | 354 | |
bogdanm | 0:9b334a45a8ff | 355 | if(status != 0xA0) { |
bogdanm | 0:9b334a45a8ff | 356 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 357 | } |
bogdanm | 0:9b334a45a8ff | 358 | |
bogdanm | 0:9b334a45a8ff | 359 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 360 | |
bogdanm | 0:9b334a45a8ff | 361 | return count; |
bogdanm | 0:9b334a45a8ff | 362 | } |
bogdanm | 0:9b334a45a8ff | 363 | |
bogdanm | 0:9b334a45a8ff | 364 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
bogdanm | 0:9b334a45a8ff | 365 | int count = 0; |
bogdanm | 0:9b334a45a8ff | 366 | int status; |
bogdanm | 0:9b334a45a8ff | 367 | |
bogdanm | 0:9b334a45a8ff | 368 | if(length <= 0) { |
bogdanm | 0:9b334a45a8ff | 369 | return(0); |
bogdanm | 0:9b334a45a8ff | 370 | } |
bogdanm | 0:9b334a45a8ff | 371 | |
bogdanm | 0:9b334a45a8ff | 372 | do { |
bogdanm | 0:9b334a45a8ff | 373 | status = i2c_do_write(obj, data[count], 0); |
bogdanm | 0:9b334a45a8ff | 374 | count++; |
bogdanm | 0:9b334a45a8ff | 375 | } while ((count < length) && (status == 0xB8)); |
bogdanm | 0:9b334a45a8ff | 376 | |
bogdanm | 0:9b334a45a8ff | 377 | if ((status != 0xC0) && (status != 0xC8)) { |
bogdanm | 0:9b334a45a8ff | 378 | i2c_stop(obj); |
bogdanm | 0:9b334a45a8ff | 379 | } |
bogdanm | 0:9b334a45a8ff | 380 | |
bogdanm | 0:9b334a45a8ff | 381 | i2c_clear_SI(obj); |
bogdanm | 0:9b334a45a8ff | 382 | |
bogdanm | 0:9b334a45a8ff | 383 | return(count); |
bogdanm | 0:9b334a45a8ff | 384 | } |
bogdanm | 0:9b334a45a8ff | 385 | |
bogdanm | 0:9b334a45a8ff | 386 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
bogdanm | 0:9b334a45a8ff | 387 | uint32_t addr; |
bogdanm | 0:9b334a45a8ff | 388 | |
bogdanm | 0:9b334a45a8ff | 389 | if ((idx >= 0) && (idx <= 3)) { |
bogdanm | 0:9b334a45a8ff | 390 | addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx]; |
bogdanm | 0:9b334a45a8ff | 391 | *((uint32_t *) addr) = address & 0xFF; |
bogdanm | 0:9b334a45a8ff | 392 | addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx]; |
bogdanm | 0:9b334a45a8ff | 393 | *((uint32_t *) addr) = mask & 0xFE; |
bogdanm | 0:9b334a45a8ff | 394 | } |
bogdanm | 0:9b334a45a8ff | 395 | } |