Lee Shen / FTHR_USB_serial_qSPI

max32630fthr quad spi , unexpected spi behavior

FTHR_USB_serial/mbed-os/drivers/I2C.cpp@0:a35c40f49345, 2018-03-13 (annotated)

Committer:
boonshen
Date:
Tue Mar 13 21:12:00 2018 +0000
Revision:
0:a35c40f49345
MAX32630FTHR QuadSPI test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
boonshen 0:a35c40f49345 1 /* mbed Microcontroller Library
boonshen 0:a35c40f49345 2 * Copyright (c) 2006-2015 ARM Limited
boonshen 0:a35c40f49345 3 *
boonshen 0:a35c40f49345 4 * Licensed under the Apache License, Version 2.0 (the "License");
boonshen 0:a35c40f49345 5 * you may not use this file except in compliance with the License.
boonshen 0:a35c40f49345 6 * You may obtain a copy of the License at
boonshen 0:a35c40f49345 7 *
boonshen 0:a35c40f49345 8 * http://www.apache.org/licenses/LICENSE-2.0
boonshen 0:a35c40f49345 9 *
boonshen 0:a35c40f49345 10 * Unless required by applicable law or agreed to in writing, software
boonshen 0:a35c40f49345 11 * distributed under the License is distributed on an "AS IS" BASIS,
boonshen 0:a35c40f49345 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
boonshen 0:a35c40f49345 13 * See the License for the specific language governing permissions and
boonshen 0:a35c40f49345 14 * limitations under the License.
boonshen 0:a35c40f49345 15 */
boonshen 0:a35c40f49345 16 #include "drivers/I2C.h"
boonshen 0:a35c40f49345 17
boonshen 0:a35c40f49345 18 #if DEVICE_I2C
boonshen 0:a35c40f49345 19
boonshen 0:a35c40f49345 20 #if DEVICE_I2C_ASYNCH
boonshen 0:a35c40f49345 21 #include "platform/mbed_sleep.h"
boonshen 0:a35c40f49345 22 #endif
boonshen 0:a35c40f49345 23
boonshen 0:a35c40f49345 24 namespace mbed {
boonshen 0:a35c40f49345 25
boonshen 0:a35c40f49345 26 I2C *I2C::_owner = NULL;
boonshen 0:a35c40f49345 27 SingletonPtr<PlatformMutex> I2C::_mutex;
boonshen 0:a35c40f49345 28
boonshen 0:a35c40f49345 29 I2C::I2C(PinName sda, PinName scl) :
boonshen 0:a35c40f49345 30 #if DEVICE_I2C_ASYNCH
boonshen 0:a35c40f49345 31 _irq(this), _usage(DMA_USAGE_NEVER),
boonshen 0:a35c40f49345 32 #endif
boonshen 0:a35c40f49345 33 _i2c(), _hz(100000) {
boonshen 0:a35c40f49345 34 // No lock needed in the constructor
boonshen 0:a35c40f49345 35
boonshen 0:a35c40f49345 36 // The init function also set the frequency to 100000
boonshen 0:a35c40f49345 37 i2c_init(&_i2c, sda, scl);
boonshen 0:a35c40f49345 38
boonshen 0:a35c40f49345 39 // Used to avoid unnecessary frequency updates
boonshen 0:a35c40f49345 40 _owner = this;
boonshen 0:a35c40f49345 41 }
boonshen 0:a35c40f49345 42
boonshen 0:a35c40f49345 43 void I2C::frequency(int hz) {
boonshen 0:a35c40f49345 44 lock();
boonshen 0:a35c40f49345 45 _hz = hz;
boonshen 0:a35c40f49345 46
boonshen 0:a35c40f49345 47 // We want to update the frequency even if we are already the bus owners
boonshen 0:a35c40f49345 48 i2c_frequency(&_i2c, _hz);
boonshen 0:a35c40f49345 49
boonshen 0:a35c40f49345 50 // Updating the frequency of the bus we become the owners of it
boonshen 0:a35c40f49345 51 _owner = this;
boonshen 0:a35c40f49345 52 unlock();
boonshen 0:a35c40f49345 53 }
boonshen 0:a35c40f49345 54
boonshen 0:a35c40f49345 55 void I2C::aquire() {
boonshen 0:a35c40f49345 56 lock();
boonshen 0:a35c40f49345 57 if (_owner != this) {
boonshen 0:a35c40f49345 58 i2c_frequency(&_i2c, _hz);
boonshen 0:a35c40f49345 59 _owner = this;
boonshen 0:a35c40f49345 60 }
boonshen 0:a35c40f49345 61 unlock();
boonshen 0:a35c40f49345 62 }
boonshen 0:a35c40f49345 63
boonshen 0:a35c40f49345 64 // write - Master Transmitter Mode
boonshen 0:a35c40f49345 65 int I2C::write(int address, const char* data, int length, bool repeated) {
boonshen 0:a35c40f49345 66 lock();
boonshen 0:a35c40f49345 67 aquire();
boonshen 0:a35c40f49345 68
boonshen 0:a35c40f49345 69 int stop = (repeated) ? 0 : 1;
boonshen 0:a35c40f49345 70 int written = i2c_write(&_i2c, address, data, length, stop);
boonshen 0:a35c40f49345 71
boonshen 0:a35c40f49345 72 unlock();
boonshen 0:a35c40f49345 73 return length != written;
boonshen 0:a35c40f49345 74 }
boonshen 0:a35c40f49345 75
boonshen 0:a35c40f49345 76 int I2C::write(int data) {
boonshen 0:a35c40f49345 77 lock();
boonshen 0:a35c40f49345 78 int ret = i2c_byte_write(&_i2c, data);
boonshen 0:a35c40f49345 79 unlock();
boonshen 0:a35c40f49345 80 return ret;
boonshen 0:a35c40f49345 81 }
boonshen 0:a35c40f49345 82
boonshen 0:a35c40f49345 83 // read - Master Reciever Mode
boonshen 0:a35c40f49345 84 int I2C::read(int address, char* data, int length, bool repeated) {
boonshen 0:a35c40f49345 85 lock();
boonshen 0:a35c40f49345 86 aquire();
boonshen 0:a35c40f49345 87
boonshen 0:a35c40f49345 88 int stop = (repeated) ? 0 : 1;
boonshen 0:a35c40f49345 89 int read = i2c_read(&_i2c, address, data, length, stop);
boonshen 0:a35c40f49345 90
boonshen 0:a35c40f49345 91 unlock();
boonshen 0:a35c40f49345 92 return length != read;
boonshen 0:a35c40f49345 93 }
boonshen 0:a35c40f49345 94
boonshen 0:a35c40f49345 95 int I2C::read(int ack) {
boonshen 0:a35c40f49345 96 lock();
boonshen 0:a35c40f49345 97 int ret;
boonshen 0:a35c40f49345 98 if (ack) {
boonshen 0:a35c40f49345 99 ret = i2c_byte_read(&_i2c, 0);
boonshen 0:a35c40f49345 100 } else {
boonshen 0:a35c40f49345 101 ret = i2c_byte_read(&_i2c, 1);
boonshen 0:a35c40f49345 102 }
boonshen 0:a35c40f49345 103 unlock();
boonshen 0:a35c40f49345 104 return ret;
boonshen 0:a35c40f49345 105 }
boonshen 0:a35c40f49345 106
boonshen 0:a35c40f49345 107 void I2C::start(void) {
boonshen 0:a35c40f49345 108 lock();
boonshen 0:a35c40f49345 109 i2c_start(&_i2c);
boonshen 0:a35c40f49345 110 unlock();
boonshen 0:a35c40f49345 111 }
boonshen 0:a35c40f49345 112
boonshen 0:a35c40f49345 113 void I2C::stop(void) {
boonshen 0:a35c40f49345 114 lock();
boonshen 0:a35c40f49345 115 i2c_stop(&_i2c);
boonshen 0:a35c40f49345 116 unlock();
boonshen 0:a35c40f49345 117 }
boonshen 0:a35c40f49345 118
boonshen 0:a35c40f49345 119 void I2C::lock() {
boonshen 0:a35c40f49345 120 _mutex->lock();
boonshen 0:a35c40f49345 121 }
boonshen 0:a35c40f49345 122
boonshen 0:a35c40f49345 123 void I2C::unlock() {
boonshen 0:a35c40f49345 124 _mutex->unlock();
boonshen 0:a35c40f49345 125 }
boonshen 0:a35c40f49345 126
boonshen 0:a35c40f49345 127 #if DEVICE_I2C_ASYNCH
boonshen 0:a35c40f49345 128
boonshen 0:a35c40f49345 129 int I2C::transfer(int address, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, const event_callback_t& callback, int event, bool repeated)
boonshen 0:a35c40f49345 130 {
boonshen 0:a35c40f49345 131 lock();
boonshen 0:a35c40f49345 132 if (i2c_active(&_i2c)) {
boonshen 0:a35c40f49345 133 unlock();
boonshen 0:a35c40f49345 134 return -1; // transaction ongoing
boonshen 0:a35c40f49345 135 }
boonshen 0:a35c40f49345 136 sleep_manager_lock_deep_sleep();
boonshen 0:a35c40f49345 137 aquire();
boonshen 0:a35c40f49345 138
boonshen 0:a35c40f49345 139 _callback = callback;
boonshen 0:a35c40f49345 140 int stop = (repeated) ? 0 : 1;
boonshen 0:a35c40f49345 141 _irq.callback(&I2C::irq_handler_asynch);
boonshen 0:a35c40f49345 142 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
boonshen 0:a35c40f49345 143 unlock();
boonshen 0:a35c40f49345 144 return 0;
boonshen 0:a35c40f49345 145 }
boonshen 0:a35c40f49345 146
boonshen 0:a35c40f49345 147 void I2C::abort_transfer(void)
boonshen 0:a35c40f49345 148 {
boonshen 0:a35c40f49345 149 lock();
boonshen 0:a35c40f49345 150 i2c_abort_asynch(&_i2c);
boonshen 0:a35c40f49345 151 sleep_manager_unlock_deep_sleep();
boonshen 0:a35c40f49345 152 unlock();
boonshen 0:a35c40f49345 153 }
boonshen 0:a35c40f49345 154
boonshen 0:a35c40f49345 155 void I2C::irq_handler_asynch(void)
boonshen 0:a35c40f49345 156 {
boonshen 0:a35c40f49345 157 int event = i2c_irq_handler_asynch(&_i2c);
boonshen 0:a35c40f49345 158 if (_callback && event) {
boonshen 0:a35c40f49345 159 _callback.call(event);
boonshen 0:a35c40f49345 160 }
boonshen 0:a35c40f49345 161 if (event) {
boonshen 0:a35c40f49345 162 sleep_manager_unlock_deep_sleep();
boonshen 0:a35c40f49345 163 }
boonshen 0:a35c40f49345 164
boonshen 0:a35c40f49345 165 }
boonshen 0:a35c40f49345 166
boonshen 0:a35c40f49345 167
boonshen 0:a35c40f49345 168 #endif
boonshen 0:a35c40f49345 169
boonshen 0:a35c40f49345 170 } // namespace mbed
boonshen 0:a35c40f49345 171
boonshen 0:a35c40f49345 172 #endif