Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

hal/spi_api.h@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?

UserRevisionLine numberNew 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 #ifndef MBED_SPI_API_H
bogdanm 0:9b334a45a8ff 17 #define MBED_SPI_API_H
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "device.h"
bogdanm 0:9b334a45a8ff 20 #include "dma_api.h"
bogdanm 0:9b334a45a8ff 21 #include "buffer.h"
bogdanm 0:9b334a45a8ff 22
bogdanm 0:9b334a45a8ff 23 #if DEVICE_SPI
bogdanm 0:9b334a45a8ff 24
bogdanm 0:9b334a45a8ff 25 #define SPI_EVENT_ERROR (1 << 1)
bogdanm 0:9b334a45a8ff 26 #define SPI_EVENT_COMPLETE (1 << 2)
bogdanm 0:9b334a45a8ff 27 #define SPI_EVENT_RX_OVERFLOW (1 << 3)
bogdanm 0:9b334a45a8ff 28 #define SPI_EVENT_ALL (SPI_EVENT_ERROR | SPI_EVENT_COMPLETE | SPI_EVENT_RX_OVERFLOW)
bogdanm 0:9b334a45a8ff 29
bogdanm 0:9b334a45a8ff 30 #define SPI_EVENT_INTERNAL_TRANSFER_COMPLETE (1 << 30) // internal flag to report an event occurred
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 #define SPI_FILL_WORD (0xFFFF)
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #if DEVICE_SPI_ASYNCH
bogdanm 0:9b334a45a8ff 35 /** Asynch spi hal structure
bogdanm 0:9b334a45a8ff 36 */
bogdanm 0:9b334a45a8ff 37 typedef struct {
bogdanm 0:9b334a45a8ff 38 struct spi_s spi; /**< Target specific spi structure */
bogdanm 0:9b334a45a8ff 39 struct buffer_s tx_buff; /**< Tx buffer */
bogdanm 0:9b334a45a8ff 40 struct buffer_s rx_buff; /**< Rx buffer */
bogdanm 0:9b334a45a8ff 41 } spi_t;
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 #else
bogdanm 0:9b334a45a8ff 44 /** Non-asynch spi hal structure
bogdanm 0:9b334a45a8ff 45 */
bogdanm 0:9b334a45a8ff 46 typedef struct spi_s spi_t;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 #endif
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 51 extern "C" {
bogdanm 0:9b334a45a8ff 52 #endif
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 /**
bogdanm 0:9b334a45a8ff 55 * \defgroup GeneralSPI SPI Configuration Functions
bogdanm 0:9b334a45a8ff 56 * @{
bogdanm 0:9b334a45a8ff 57 */
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 /** Initialize the SPI peripheral
bogdanm 0:9b334a45a8ff 60 *
bogdanm 0:9b334a45a8ff 61 * Configures the pins used by SPI, sets a default format and frequency, and enables the peripheral
bogdanm 0:9b334a45a8ff 62 * @param[out] obj The SPI object to initialize
bogdanm 0:9b334a45a8ff 63 * @param[in] mosi The pin to use for MOSI
bogdanm 0:9b334a45a8ff 64 * @param[in] miso The pin to use for MISO
bogdanm 0:9b334a45a8ff 65 * @param[in] sclk The pin to use for SCLK
bogdanm 0:9b334a45a8ff 66 * @param[in] ssel The pin to use for SSEL
bogdanm 0:9b334a45a8ff 67 */
bogdanm 0:9b334a45a8ff 68 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel);
bogdanm 0:9b334a45a8ff 69
bogdanm 0:9b334a45a8ff 70 /** Release a SPI object
bogdanm 0:9b334a45a8ff 71 *
bogdanm 0:9b334a45a8ff 72 * TODO: spi_free is currently unimplemented
bogdanm 0:9b334a45a8ff 73 * This will require reference counting at the C++ level to be safe
bogdanm 0:9b334a45a8ff 74 *
bogdanm 0:9b334a45a8ff 75 * Return the pins owned by the SPI object to their reset state
bogdanm 0:9b334a45a8ff 76 * Disable the SPI peripheral
bogdanm 0:9b334a45a8ff 77 * Disable the SPI clock
bogdanm 0:9b334a45a8ff 78 * @param[in] obj The SPI object to deinitialize
bogdanm 0:9b334a45a8ff 79 */
bogdanm 0:9b334a45a8ff 80 void spi_free(spi_t *obj);
bogdanm 0:9b334a45a8ff 81
bogdanm 0:9b334a45a8ff 82 /** Configure the SPI format
bogdanm 0:9b334a45a8ff 83 *
bogdanm 0:9b334a45a8ff 84 * Set the number of bits per frame, configure clock polarity and phase, shift order and master/slave mode
bogdanm 0:9b334a45a8ff 85 * @param[in,out] obj The SPI object to configure
bogdanm 0:9b334a45a8ff 86 * @param[in] bits The number of bits per frame
bogdanm 0:9b334a45a8ff 87 * @param[in] mode The SPI mode (clock polarity, phase, and shift direction)
bogdanm 0:9b334a45a8ff 88 * @param[in] slave Zero for master mode or non-zero for slave mode
bogdanm 0:9b334a45a8ff 89 */
bogdanm 0:9b334a45a8ff 90 void spi_format(spi_t *obj, int bits, int mode, int slave);
bogdanm 0:9b334a45a8ff 91
bogdanm 0:9b334a45a8ff 92 /** Set the SPI baud rate
bogdanm 0:9b334a45a8ff 93 *
bogdanm 0:9b334a45a8ff 94 * Actual frequency may differ from the desired frequency due to available dividers and bus clock
bogdanm 0:9b334a45a8ff 95 * Configures the SPI peripheral's baud rate
bogdanm 0:9b334a45a8ff 96 * @param[in,out] obj The SPI object to configure
bogdanm 0:9b334a45a8ff 97 * @param[in] hz The baud rate in Hz
bogdanm 0:9b334a45a8ff 98 */
bogdanm 0:9b334a45a8ff 99 void spi_frequency(spi_t *obj, int hz);
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 /**@}*/
bogdanm 0:9b334a45a8ff 102 /**
bogdanm 0:9b334a45a8ff 103 * \defgroup SynchSPI Synchronous SPI Hardware Abstraction Layer
bogdanm 0:9b334a45a8ff 104 * @{
bogdanm 0:9b334a45a8ff 105 */
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 /** Write a byte out in master mode and receive a value
bogdanm 0:9b334a45a8ff 108 *
bogdanm 0:9b334a45a8ff 109 * @param[in] obj The SPI peripheral to use for sending
bogdanm 0:9b334a45a8ff 110 * @param[in] value The value to send
bogdanm 0:9b334a45a8ff 111 * @return Returns the value received during send
bogdanm 0:9b334a45a8ff 112 */
bogdanm 0:9b334a45a8ff 113 int spi_master_write(spi_t *obj, int value);
bogdanm 0:9b334a45a8ff 114
bogdanm 0:9b334a45a8ff 115 /** Check if a value is available to read
bogdanm 0:9b334a45a8ff 116 *
bogdanm 0:9b334a45a8ff 117 * @param[in] obj The SPI peripheral to check
bogdanm 0:9b334a45a8ff 118 * @return non-zero if a value is available
bogdanm 0:9b334a45a8ff 119 */
bogdanm 0:9b334a45a8ff 120 int spi_slave_receive(spi_t *obj);
bogdanm 0:9b334a45a8ff 121
bogdanm 0:9b334a45a8ff 122 /** Get a received value out of the SPI receive buffer in slave mode
bogdanm 0:9b334a45a8ff 123 *
bogdanm 0:9b334a45a8ff 124 * Blocks until a value is available
bogdanm 0:9b334a45a8ff 125 * @param[in] obj The SPI peripheral to read
bogdanm 0:9b334a45a8ff 126 * @return The value received
bogdanm 0:9b334a45a8ff 127 */
bogdanm 0:9b334a45a8ff 128 int spi_slave_read(spi_t *obj);
bogdanm 0:9b334a45a8ff 129
bogdanm 0:9b334a45a8ff 130 /** Write a value to the SPI peripheral in slave mode
bogdanm 0:9b334a45a8ff 131 *
bogdanm 0:9b334a45a8ff 132 * Blocks until the SPI peripheral can be written to
bogdanm 0:9b334a45a8ff 133 * @param[in] obj The SPI peripheral to write
bogdanm 0:9b334a45a8ff 134 * @param[in] value The value to write
bogdanm 0:9b334a45a8ff 135 */
bogdanm 0:9b334a45a8ff 136 void spi_slave_write(spi_t *obj, int value);
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 /** Checks if the specified SPI peripheral is in use
bogdanm 0:9b334a45a8ff 139 *
bogdanm 0:9b334a45a8ff 140 * @param[in] obj The SPI peripheral to check
bogdanm 0:9b334a45a8ff 141 * @return non-zero if the peripheral is currently transmitting
bogdanm 0:9b334a45a8ff 142 */
bogdanm 0:9b334a45a8ff 143 int spi_busy(spi_t *obj);
bogdanm 0:9b334a45a8ff 144
bogdanm 0:9b334a45a8ff 145 /** Get the module number
bogdanm 0:9b334a45a8ff 146 *
bogdanm 0:9b334a45a8ff 147 * @param[in] obj The SPI peripheral to check
bogdanm 0:9b334a45a8ff 148 * @return The module number
bogdanm 0:9b334a45a8ff 149 */
bogdanm 0:9b334a45a8ff 150 uint8_t spi_get_module(spi_t *obj);
bogdanm 0:9b334a45a8ff 151
bogdanm 0:9b334a45a8ff 152 /**@}*/
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 #if DEVICE_SPI_ASYNCH
bogdanm 0:9b334a45a8ff 155 /**
bogdanm 0:9b334a45a8ff 156 * \defgroup AsynchSPI Asynchronous SPI Hardware Abstraction Layer
bogdanm 0:9b334a45a8ff 157 * @{
bogdanm 0:9b334a45a8ff 158 */
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 /** Begin the SPI transfer. Buffer pointers and lengths are specified in tx_buff and rx_buff
bogdanm 0:9b334a45a8ff 161 *
bogdanm 0:9b334a45a8ff 162 * @param[in] obj The SPI object which holds the transfer information
bogdanm 0:9b334a45a8ff 163 * @param[in] tx The buffer to send
bogdanm 0:9b334a45a8ff 164 * @param[in] tx_length The number of words to transmit
bogdanm 0:9b334a45a8ff 165 * @param[in] rx The buffer to receive
bogdanm 0:9b334a45a8ff 166 * @param[in] rx_length The number of words to receive
bogdanm 0:9b334a45a8ff 167 * @param[in] bit_width The bit width of buffer words
bogdanm 0:9b334a45a8ff 168 * @param[in] event The logical OR of events to be registered
bogdanm 0:9b334a45a8ff 169 * @param[in] handler SPI interrupt handler
bogdanm 0:9b334a45a8ff 170 * @param[in] hint A suggestion for how to use DMA with this transfer
bogdanm 0:9b334a45a8ff 171 */
bogdanm 0:9b334a45a8ff 172 void spi_master_transfer(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint8_t bit_width, uint32_t handler, uint32_t event, DMAUsage hint);
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 /** The asynchronous IRQ handler
bogdanm 0:9b334a45a8ff 175 *
bogdanm 0:9b334a45a8ff 176 * Reads the received values out of the RX FIFO, writes values into the TX FIFO and checks for transfer termination
bogdanm 0:9b334a45a8ff 177 * conditions, such as buffer overflows or transfer complete.
bogdanm 0:9b334a45a8ff 178 * @param[in] obj The SPI object which holds the transfer information
bogdanm 0:9b334a45a8ff 179 * @return event flags if a transfer termination condition was met or 0 otherwise.
bogdanm 0:9b334a45a8ff 180 */
bogdanm 0:9b334a45a8ff 181 uint32_t spi_irq_handler_asynch(spi_t *obj);
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 /** Attempts to determine if the SPI peripheral is already in use.
bogdanm 0:9b334a45a8ff 184 *
bogdanm 0:9b334a45a8ff 185 * If a temporary DMA channel has been allocated, peripheral is in use.
bogdanm 0:9b334a45a8ff 186 * If a permanent DMA channel has been allocated, check if the DMA channel is in use. If not, proceed as though no DMA
bogdanm 0:9b334a45a8ff 187 * channel were allocated.
bogdanm 0:9b334a45a8ff 188 * If no DMA channel is allocated, check whether tx and rx buffers have been assigned. For each assigned buffer, check
bogdanm 0:9b334a45a8ff 189 * if the corresponding buffer position is less than the buffer length. If buffers do not indicate activity, check if
bogdanm 0:9b334a45a8ff 190 * there are any bytes in the FIFOs.
bogdanm 0:9b334a45a8ff 191 * @param[in] obj The SPI object to check for activity
bogdanm 0:9b334a45a8ff 192 * @return non-zero if the SPI port is active or zero if it is not.
bogdanm 0:9b334a45a8ff 193 */
bogdanm 0:9b334a45a8ff 194 uint8_t spi_active(spi_t *obj);
bogdanm 0:9b334a45a8ff 195
bogdanm 0:9b334a45a8ff 196 /** Abort an SPI transfer
bogdanm 0:9b334a45a8ff 197 *
bogdanm 0:9b334a45a8ff 198 * @param obj The SPI peripheral to stop
bogdanm 0:9b334a45a8ff 199 */
bogdanm 0:9b334a45a8ff 200 void spi_abort_asynch(spi_t *obj);
bogdanm 0:9b334a45a8ff 201
bogdanm 0:9b334a45a8ff 202
bogdanm 0:9b334a45a8ff 203 #endif
bogdanm 0:9b334a45a8ff 204
bogdanm 0:9b334a45a8ff 205 /**@}*/
bogdanm 0:9b334a45a8ff 206
bogdanm 0:9b334a45a8ff 207 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 208 }
bogdanm 0:9b334a45a8ff 209 #endif // __cplusplus
bogdanm 0:9b334a45a8ff 210
bogdanm 0:9b334a45a8ff 211 #endif // SPI_DEVICE
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 #endif // MBED_SPI_API_H