mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Maxim/TARGET_MAX32630/i2c_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 157:ff67d9f36b67 1 /*******************************************************************************
<> 157:ff67d9f36b67 2 * Copyright (c) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 157:ff67d9f36b67 3 *
<> 157:ff67d9f36b67 4 * Permission is hereby granted, free of charge, to any person obtaining a
<> 157:ff67d9f36b67 5 * copy of this software and associated documentation files (the "Software"),
<> 157:ff67d9f36b67 6 * to deal in the Software without restriction, including without limitation
<> 157:ff67d9f36b67 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 157:ff67d9f36b67 8 * and/or sell copies of the Software, and to permit persons to whom the
<> 157:ff67d9f36b67 9 * Software is furnished to do so, subject to the following conditions:
<> 157:ff67d9f36b67 10 *
<> 157:ff67d9f36b67 11 * The above copyright notice and this permission notice shall be included
<> 157:ff67d9f36b67 12 * in all copies or substantial portions of the Software.
<> 157:ff67d9f36b67 13 *
<> 157:ff67d9f36b67 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 157:ff67d9f36b67 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 157:ff67d9f36b67 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 157:ff67d9f36b67 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 157:ff67d9f36b67 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 157:ff67d9f36b67 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 157:ff67d9f36b67 20 * OTHER DEALINGS IN THE SOFTWARE.
<> 157:ff67d9f36b67 21 *
<> 157:ff67d9f36b67 22 * Except as contained in this notice, the name of Maxim Integrated
<> 157:ff67d9f36b67 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 157:ff67d9f36b67 24 * Products, Inc. Branding Policy.
<> 157:ff67d9f36b67 25 *
<> 157:ff67d9f36b67 26 * The mere transfer of this software does not imply any licenses
<> 157:ff67d9f36b67 27 * of trade secrets, proprietary technology, copyrights, patents,
<> 157:ff67d9f36b67 28 * trademarks, maskwork rights, or any other form of intellectual
<> 157:ff67d9f36b67 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 157:ff67d9f36b67 30 * ownership rights.
<> 157:ff67d9f36b67 31 *******************************************************************************
<> 157:ff67d9f36b67 32 */
<> 157:ff67d9f36b67 33
<> 157:ff67d9f36b67 34 #include "mbed_assert.h"
<> 157:ff67d9f36b67 35 #include "i2c_api.h"
<> 157:ff67d9f36b67 36 #include "i2cm_regs.h"
<> 157:ff67d9f36b67 37 #include "i2cm.h"
<> 157:ff67d9f36b67 38 #include "pinmap.h"
<> 157:ff67d9f36b67 39 #include "PeripheralPins.h"
<> 157:ff67d9f36b67 40
<> 157:ff67d9f36b67 41 #ifndef MXC_I2CM_RX_TIMEOUT
<> 157:ff67d9f36b67 42 #define MXC_I2CM_RX_TIMEOUT 0x5000
<> 157:ff67d9f36b67 43 #endif
<> 157:ff67d9f36b67 44
<> 157:ff67d9f36b67 45 #define MBED_NAK 0
<> 157:ff67d9f36b67 46 #define MBED_ACK 1
<> 157:ff67d9f36b67 47 #define MBED_TIMEOUT 2
<> 157:ff67d9f36b67 48
<> 157:ff67d9f36b67 49 //******************************************************************************
<> 157:ff67d9f36b67 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 157:ff67d9f36b67 51 {
<> 157:ff67d9f36b67 52 // SDA and SCL must map to same peripheral instance
<> 157:ff67d9f36b67 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 157:ff67d9f36b67 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 157:ff67d9f36b67 55 mxc_i2cm_regs_t *i2c = (mxc_i2cm_regs_t*)pinmap_merge(i2c_sda, i2c_scl);
<> 157:ff67d9f36b67 56 MBED_ASSERT((int)i2c != NC);
<> 157:ff67d9f36b67 57
<> 157:ff67d9f36b67 58 obj->i2c = i2c;
<> 157:ff67d9f36b67 59 obj->fifo = MXC_I2CM_GET_FIFO(MXC_I2CM_GET_IDX(i2c));
<> 157:ff67d9f36b67 60 obj->start_pending = 0;
<> 157:ff67d9f36b67 61
<> 157:ff67d9f36b67 62 // Merge pin function requests for use with CMSIS init func
<> 157:ff67d9f36b67 63 ioman_req_t io_req;
<> 157:ff67d9f36b67 64 pin_function_t *pin_func;
<> 157:ff67d9f36b67 65 pin_func = (pin_function_t *)pinmap_find_function(sda, PinMap_I2C_SDA);
<> 157:ff67d9f36b67 66 io_req.value = pin_func->req_val;
<> 157:ff67d9f36b67 67 pin_func = (pin_function_t *)pinmap_find_function(scl, PinMap_I2C_SCL);
<> 157:ff67d9f36b67 68 io_req.value |= pin_func->req_val;
<> 157:ff67d9f36b67 69
<> 157:ff67d9f36b67 70 obj->sys_cfg.io_cfg.req_reg = pin_func->reg_req;
<> 157:ff67d9f36b67 71 obj->sys_cfg.io_cfg.ack_reg = pin_func->reg_ack;
<> 157:ff67d9f36b67 72 obj->sys_cfg.io_cfg.req_val = io_req;
<> 157:ff67d9f36b67 73 obj->sys_cfg.clk_scale = CLKMAN_SCALE_DIV_1;
<> 157:ff67d9f36b67 74
<> 157:ff67d9f36b67 75 I2CM_Init(obj->i2c, &obj->sys_cfg, I2CM_SPEED_400KHZ);
<> 157:ff67d9f36b67 76 }
<> 157:ff67d9f36b67 77
<> 157:ff67d9f36b67 78 //******************************************************************************
<> 157:ff67d9f36b67 79 void i2c_frequency(i2c_t *obj, int hz)
<> 157:ff67d9f36b67 80 {
Anna Bridge 186:707f6e361f3e 81 I2CM_Init(obj->i2c, &obj->sys_cfg, (i2cm_speed_t)hz);
<> 157:ff67d9f36b67 82 }
<> 157:ff67d9f36b67 83
<> 157:ff67d9f36b67 84 //******************************************************************************
<> 157:ff67d9f36b67 85 int i2c_start(i2c_t *obj)
<> 157:ff67d9f36b67 86 {
<> 157:ff67d9f36b67 87 obj->start_pending = 1;
<> 157:ff67d9f36b67 88 return 0;
<> 157:ff67d9f36b67 89 }
<> 157:ff67d9f36b67 90
<> 157:ff67d9f36b67 91 //******************************************************************************
<> 157:ff67d9f36b67 92 int i2c_stop(i2c_t *obj)
<> 157:ff67d9f36b67 93 {
<> 157:ff67d9f36b67 94 obj->start_pending = 0;
<> 157:ff67d9f36b67 95 I2CM_WriteTxFifo(obj->i2c, obj->fifo, MXC_S_I2CM_TRANS_TAG_STOP);
<> 157:ff67d9f36b67 96 I2CM_TxInProgress(obj->i2c);
<> 157:ff67d9f36b67 97 return 0;
<> 157:ff67d9f36b67 98 }
<> 157:ff67d9f36b67 99
<> 157:ff67d9f36b67 100 //******************************************************************************
<> 157:ff67d9f36b67 101 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 157:ff67d9f36b67 102 {
<> 157:ff67d9f36b67 103 return I2CM_Read(obj->i2c, address >> 1, NULL, 0, (uint8_t *)data, length);
<> 157:ff67d9f36b67 104 }
<> 157:ff67d9f36b67 105
<> 157:ff67d9f36b67 106 //******************************************************************************
<> 157:ff67d9f36b67 107 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 157:ff67d9f36b67 108 {
<> 157:ff67d9f36b67 109 mxc_i2cm_regs_t *i2cm = obj->i2c;
<> 157:ff67d9f36b67 110 mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
<> 157:ff67d9f36b67 111
<> 157:ff67d9f36b67 112 if (stop) {
<> 157:ff67d9f36b67 113 return I2CM_Write(i2cm, address >> 1, NULL, 0, (uint8_t *)data, length);
<> 157:ff67d9f36b67 114 }
<> 157:ff67d9f36b67 115
<> 157:ff67d9f36b67 116 i2cm->inten = 0;
<> 157:ff67d9f36b67 117 i2cm->intfl = i2cm->intfl;
<> 157:ff67d9f36b67 118 if (I2CM_Tx(i2cm, fifo, address >> 1, (uint8_t *)data, length, 0) == E_NO_ERROR) {
<> 157:ff67d9f36b67 119 return length;
<> 157:ff67d9f36b67 120 } else {
<> 157:ff67d9f36b67 121 return -1;
<> 157:ff67d9f36b67 122 }
<> 157:ff67d9f36b67 123 }
<> 157:ff67d9f36b67 124
<> 157:ff67d9f36b67 125 //******************************************************************************
<> 157:ff67d9f36b67 126 void i2c_reset(i2c_t *obj)
<> 157:ff67d9f36b67 127 {
<> 157:ff67d9f36b67 128 I2CM_Recover(obj->i2c);
<> 157:ff67d9f36b67 129 }
<> 157:ff67d9f36b67 130
<> 157:ff67d9f36b67 131 //******************************************************************************
<> 157:ff67d9f36b67 132 int i2c_byte_read(i2c_t *obj, int last)
<> 157:ff67d9f36b67 133 {
<> 157:ff67d9f36b67 134 mxc_i2cm_regs_t *i2cm = obj->i2c;
<> 157:ff67d9f36b67 135 mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
<> 157:ff67d9f36b67 136 int tmp;
<> 157:ff67d9f36b67 137
<> 157:ff67d9f36b67 138 // Start the transaction if it is not currently ongoing
<> 157:ff67d9f36b67 139 if (!(i2cm->trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
<> 157:ff67d9f36b67 140 i2cm->trans |= MXC_F_I2CM_TRANS_TX_START;
<> 157:ff67d9f36b67 141 }
<> 157:ff67d9f36b67 142
<> 157:ff67d9f36b67 143 if (last) {
<> 157:ff67d9f36b67 144 // NACK the last read byte
<> 157:ff67d9f36b67 145 if (I2CM_WriteTxFifo(i2cm, fifo, MXC_S_I2CM_TRANS_TAG_RXDATA_NACK) != E_NO_ERROR) {
<> 157:ff67d9f36b67 146 goto byte_read_err;
<> 157:ff67d9f36b67 147 }
<> 157:ff67d9f36b67 148 } else {
<> 157:ff67d9f36b67 149 if (I2CM_WriteTxFifo(i2cm, fifo, MXC_S_I2CM_TRANS_TAG_RXDATA_COUNT) != E_NO_ERROR) {
<> 157:ff67d9f36b67 150 goto byte_read_err;
<> 157:ff67d9f36b67 151 }
<> 157:ff67d9f36b67 152 }
<> 157:ff67d9f36b67 153
<> 157:ff67d9f36b67 154 do {
<> 157:ff67d9f36b67 155 // Wait for data in RX FIFO
<> 157:ff67d9f36b67 156 int timeout = MXC_I2CM_RX_TIMEOUT;
<> 157:ff67d9f36b67 157 while (!(i2cm->intfl & MXC_F_I2CM_INTFL_RX_FIFO_NOT_EMPTY) &&
<> 157:ff67d9f36b67 158 ((i2cm->bb & MXC_F_I2CM_BB_RX_FIFO_CNT) == 0)) {
<> 157:ff67d9f36b67 159
<> 157:ff67d9f36b67 160 if((timeout-- < 0) || (i2cm->trans & MXC_F_I2CM_TRANS_TX_TIMEOUT)) {
<> 157:ff67d9f36b67 161 goto byte_read_err;
<> 157:ff67d9f36b67 162 }
<> 157:ff67d9f36b67 163
<> 157:ff67d9f36b67 164 if (i2cm->trans & (MXC_F_I2CM_TRANS_TX_LOST_ARBITR | MXC_F_I2CM_TRANS_TX_NACKED)) {
<> 157:ff67d9f36b67 165 goto byte_read_err;
<> 157:ff67d9f36b67 166 }
<> 157:ff67d9f36b67 167 }
<> 157:ff67d9f36b67 168 i2cm->intfl = MXC_F_I2CM_INTFL_RX_FIFO_NOT_EMPTY;
<> 157:ff67d9f36b67 169
<> 157:ff67d9f36b67 170 } while ((tmp = fifo->rx) & MXC_S_I2CM_RSTLS_TAG_EMPTY);
<> 157:ff67d9f36b67 171
<> 157:ff67d9f36b67 172 return (uint8_t)tmp;
<> 157:ff67d9f36b67 173
<> 157:ff67d9f36b67 174 byte_read_err:
<> 157:ff67d9f36b67 175 i2c_reset(obj);
<> 157:ff67d9f36b67 176 return -1;
<> 157:ff67d9f36b67 177 }
<> 157:ff67d9f36b67 178
<> 157:ff67d9f36b67 179 //******************************************************************************
<> 157:ff67d9f36b67 180 int i2c_byte_write(i2c_t *obj, int data)
<> 157:ff67d9f36b67 181 {
<> 157:ff67d9f36b67 182 mxc_i2cm_regs_t *i2cm = obj->i2c;
<> 157:ff67d9f36b67 183 mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
<> 157:ff67d9f36b67 184 int result;
<> 157:ff67d9f36b67 185
<> 157:ff67d9f36b67 186 if (obj->start_pending) {
<> 157:ff67d9f36b67 187 obj->start_pending = 0;
<> 157:ff67d9f36b67 188 data |= MXC_S_I2CM_TRANS_TAG_START;
<> 157:ff67d9f36b67 189 } else {
<> 157:ff67d9f36b67 190 data |= MXC_S_I2CM_TRANS_TAG_TXDATA_ACK;
<> 157:ff67d9f36b67 191 }
<> 157:ff67d9f36b67 192
<> 157:ff67d9f36b67 193 if ((result = I2CM_WriteTxFifo(i2cm, fifo, data)) != E_NO_ERROR) {
<> 157:ff67d9f36b67 194 i2c_reset(obj);
<> 157:ff67d9f36b67 195 if (result == E_COMM_ERR) {
<> 157:ff67d9f36b67 196 return MBED_NAK;
<> 157:ff67d9f36b67 197 }
<> 157:ff67d9f36b67 198 return MBED_TIMEOUT;
<> 157:ff67d9f36b67 199 }
<> 157:ff67d9f36b67 200
<> 157:ff67d9f36b67 201 // Start the transaction if it is not currently ongoing
<> 157:ff67d9f36b67 202 if (!(i2cm->trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
<> 157:ff67d9f36b67 203 i2cm->trans |= MXC_F_I2CM_TRANS_TX_START;
<> 157:ff67d9f36b67 204 }
<> 157:ff67d9f36b67 205
<> 157:ff67d9f36b67 206 return MBED_ACK;
<> 157:ff67d9f36b67 207 }