[374] | 1 |
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| 2 | /** \addtogroup hal */
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| 3 | /** @{*/
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| 4 | /* mbed Microcontroller Library
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| 5 | * Copyright (c) 2006-2013 ARM Limited
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 8 | * you may not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | */
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| 19 | #ifndef MBED_SERIAL_API_H
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| 20 | #define MBED_SERIAL_API_H
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| 21 |
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| 22 | #include "device.h"
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| 23 | #include "hal/buffer.h"
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| 24 | #include "hal/dma_api.h"
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| 25 |
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| 26 | #if DEVICE_SERIAL
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| 27 |
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| 28 | #define SERIAL_EVENT_TX_SHIFT (2)
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| 29 | #define SERIAL_EVENT_RX_SHIFT (8)
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| 30 |
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| 31 | #define SERIAL_EVENT_TX_MASK (0x00FC)
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| 32 | #define SERIAL_EVENT_RX_MASK (0x3F00)
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| 33 |
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| 34 | #define SERIAL_EVENT_ERROR (1 << 1)
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| 35 |
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| 36 | /**
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| 37 | * @defgroup SerialTXEvents Serial TX Events Macros
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| 38 | *
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| 39 | * @{
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| 40 | */
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| 41 | #define SERIAL_EVENT_TX_COMPLETE (1 << (SERIAL_EVENT_TX_SHIFT + 0))
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| 42 | #define SERIAL_EVENT_TX_ALL (SERIAL_EVENT_TX_COMPLETE)
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| 43 | /**@}*/
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| 44 |
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| 45 | /**
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| 46 | * @defgroup SerialRXEvents Serial RX Events Macros
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| 47 | *
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| 48 | * @{
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| 49 | */
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| 50 | #define SERIAL_EVENT_RX_COMPLETE (1 << (SERIAL_EVENT_RX_SHIFT + 0))
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| 51 | #define SERIAL_EVENT_RX_OVERRUN_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 1))
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| 52 | #define SERIAL_EVENT_RX_FRAMING_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 2))
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| 53 | #define SERIAL_EVENT_RX_PARITY_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 3))
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| 54 | #define SERIAL_EVENT_RX_OVERFLOW (1 << (SERIAL_EVENT_RX_SHIFT + 4))
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| 55 | #define SERIAL_EVENT_RX_CHARACTER_MATCH (1 << (SERIAL_EVENT_RX_SHIFT + 5))
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| 56 | #define SERIAL_EVENT_RX_ALL (SERIAL_EVENT_RX_OVERFLOW | SERIAL_EVENT_RX_PARITY_ERROR | \
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| 57 | SERIAL_EVENT_RX_FRAMING_ERROR | SERIAL_EVENT_RX_OVERRUN_ERROR | \
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| 58 | SERIAL_EVENT_RX_COMPLETE | SERIAL_EVENT_RX_CHARACTER_MATCH)
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| 59 | /**@}*/
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| 60 |
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| 61 | #define SERIAL_RESERVED_CHAR_MATCH (255)
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| 62 |
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| 63 | typedef enum {
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| 64 | ParityNone = 0,
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| 65 | ParityOdd = 1,
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| 66 | ParityEven = 2,
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| 67 | ParityForced1 = 3,
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| 68 | ParityForced0 = 4
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| 69 | } SerialParity;
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| 70 |
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| 71 | typedef enum {
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| 72 | RxIrq,
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| 73 | TxIrq
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| 74 | } SerialIrq;
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| 75 |
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| 76 | typedef enum {
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| 77 | FlowControlNone,
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| 78 | FlowControlRTS,
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| 79 | FlowControlCTS,
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| 80 | FlowControlRTSCTS
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| 81 | } FlowControl;
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| 82 |
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| 83 | typedef void (*uart_irq_handler)(uint32_t id, SerialIrq event);
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| 84 |
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| 85 | #if DEVICE_SERIAL_ASYNCH
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| 86 | /** Asynch serial HAL structure
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| 87 | */
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| 88 | typedef struct {
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| 89 | struct serial_s serial; /**< Target specific serial structure */
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| 90 | struct buffer_s tx_buff; /**< TX buffer */
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| 91 | struct buffer_s rx_buff; /**< RX buffer */
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| 92 | uint8_t char_match; /**< Character to be matched */
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| 93 | uint8_t char_found; /**< State of the matched character */
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| 94 | } serial_t;
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| 95 |
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| 96 | #else
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| 97 | /** Non-asynch serial HAL structure
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| 98 | */
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| 99 | typedef struct serial_s serial_t;
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| 100 |
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| 101 | #endif
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| 102 |
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| 103 | #ifdef __cplusplus
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| 104 | extern "C" {
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| 105 | #endif
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| 106 |
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| 107 | /**
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| 108 | * \defgroup hal_GeneralSerial Serial Configuration Functions
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| 109 | * @{
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| 110 | */
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| 111 |
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| 112 | /** Initialize the serial peripheral. It sets the default parameters for serial
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| 113 | * peripheral, and configures its specifieds pins.
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| 114 | *
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| 115 | * @param obj The serial object
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| 116 | * @param tx The TX pin name
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| 117 | * @param rx The RX pin name
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| 118 | */
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| 119 | void serial_init(serial_t *obj, PinName tx, PinName rx);
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| 120 |
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| 121 | /** Release the serial peripheral, not currently invoked. It requires further
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| 122 | * resource management.
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| 123 | *
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| 124 | * @param obj The serial object
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| 125 | */
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| 126 | void serial_free(serial_t *obj);
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| 127 |
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| 128 | /** Configure the baud rate
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| 129 | *
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| 130 | * @param obj The serial object
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| 131 | * @param baudrate The baud rate to be configured
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| 132 | */
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| 133 | void serial_baud(serial_t *obj, int baudrate);
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| 134 |
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| 135 | /** Configure the format. Set the number of bits, parity and the number of stop bits
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| 136 | *
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| 137 | * @param obj The serial object
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| 138 | * @param data_bits The number of data bits
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| 139 | * @param parity The parity
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| 140 | * @param stop_bits The number of stop bits
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| 141 | */
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| 142 | void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits);
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| 143 |
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| 144 | /** The serial interrupt handler registration
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| 145 | *
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| 146 | * @param obj The serial object
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| 147 | * @param handler The interrupt handler which will be invoked when the interrupt fires
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| 148 | * @param id The SerialBase object
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| 149 | */
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| 150 | void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id);
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| 151 |
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| 152 | /** Configure serial interrupt. This function is used for word-approach
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| 153 | *
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| 154 | * @param obj The serial object
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| 155 | * @param irq The serial IRQ type (RX or TX)
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| 156 | * @param enable Set to non-zero to enable events, or zero to disable them
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| 157 | */
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| 158 | void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable);
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| 159 |
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| 160 | /** Get character. This is a blocking call, waiting for a character
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| 161 | *
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| 162 | * @param obj The serial object
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| 163 | */
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| 164 | int serial_getc(serial_t *obj);
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| 165 |
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| 166 | /** Send a character. This is a blocking call, waiting for a peripheral to be available
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| 167 | * for writing
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| 168 | *
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| 169 | * @param obj The serial object
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| 170 | * @param c The character to be sent
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| 171 | */
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| 172 | void serial_putc(serial_t *obj, int c);
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| 173 |
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| 174 | /** Check if the serial peripheral is readable
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| 175 | *
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| 176 | * @param obj The serial object
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| 177 | * @return Non-zero value if a character can be read, 0 if nothing to read
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| 178 | */
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| 179 | int serial_readable(serial_t *obj);
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| 180 |
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| 181 | /** Check if the serial peripheral is writable
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| 182 | *
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| 183 | * @param obj The serial object
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| 184 | * @return Non-zero value if a character can be written, 0 otherwise.
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| 185 | */
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| 186 | int serial_writable(serial_t *obj);
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| 187 |
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| 188 | /** Clear the serial peripheral
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| 189 | *
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| 190 | * @param obj The serial object
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| 191 | */
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| 192 | void serial_clear(serial_t *obj);
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| 193 |
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| 194 | /** Set the break
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| 195 | *
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| 196 | * @param obj The serial object
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| 197 | */
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| 198 | void serial_break_set(serial_t *obj);
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| 199 |
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| 200 | /** Clear the break
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| 201 | *
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| 202 | * @param obj The serial object
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| 203 | */
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| 204 | void serial_break_clear(serial_t *obj);
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| 205 |
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| 206 | /** Configure the TX pin for UART function.
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| 207 | *
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| 208 | * @param tx The pin name used for TX
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| 209 | */
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| 210 | void serial_pinout_tx(PinName tx);
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| 211 |
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| 212 | /** Configure the serial for the flow control. It sets flow control in the hardware
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| 213 | * if a serial peripheral supports it, otherwise software emulation is used.
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| 214 | *
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| 215 | * @param obj The serial object
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| 216 | * @param type The type of the flow control. Look at the available FlowControl types.
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| 217 | * @param rxflow The TX pin name
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| 218 | * @param txflow The RX pin name
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| 219 | */
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| 220 | void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow);
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| 221 |
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| 222 | #if DEVICE_SERIAL_ASYNCH
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| 223 |
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| 224 | /**@}*/
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| 225 |
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| 226 | /**
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| 227 | * \defgroup hal_AsynchSerial Asynchronous Serial Hardware Abstraction Layer
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| 228 | * @{
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| 229 | */
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| 230 |
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| 231 | /** Begin asynchronous TX transfer. The used buffer is specified in the serial object,
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| 232 | * tx_buff
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| 233 | *
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| 234 | * @param obj The serial object
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| 235 | * @param tx The transmit buffer
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| 236 | * @param tx_length The number of bytes to transmit
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| 237 | * @param tx_width Deprecated argument
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| 238 | * @param handler The serial handler
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| 239 | * @param event The logical OR of events to be registered
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| 240 | * @param hint A suggestion for how to use DMA with this transfer
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| 241 | * @return Returns number of data transfered, otherwise returns 0
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| 242 | */
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| 243 | int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length, uint8_t tx_width, uint32_t handler, uint32_t event, DMAUsage hint);
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| 244 |
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| 245 | /** Begin asynchronous RX transfer (enable interrupt for data collecting)
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| 246 | * The used buffer is specified in the serial object - rx_buff
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| 247 | *
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| 248 | * @param obj The serial object
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| 249 | * @param rx The receive buffer
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| 250 | * @param rx_length The number of bytes to receive
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| 251 | * @param rx_width Deprecated argument
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| 252 | * @param handler The serial handler
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| 253 | * @param event The logical OR of events to be registered
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| 254 | * @param handler The serial handler
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| 255 | * @param char_match A character in range 0-254 to be matched
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| 256 | * @param hint A suggestion for how to use DMA with this transfer
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| 257 | */
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| 258 | void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint);
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| 259 |
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| 260 | /** Attempts to determine if the serial peripheral is already in use for TX
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| 261 | *
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| 262 | * @param obj The serial object
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| 263 | * @return Non-zero if the RX transaction is ongoing, 0 otherwise
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| 264 | */
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| 265 | uint8_t serial_tx_active(serial_t *obj);
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| 266 |
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| 267 | /** Attempts to determine if the serial peripheral is already in use for RX
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| 268 | *
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| 269 | * @param obj The serial object
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| 270 | * @return Non-zero if the RX transaction is ongoing, 0 otherwise
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| 271 | */
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| 272 | uint8_t serial_rx_active(serial_t *obj);
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| 273 |
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| 274 | /** The asynchronous TX and RX handler.
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| 275 | *
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| 276 | * @param obj The serial object
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| 277 | * @return Returns event flags if an RX transfer termination condition was met; otherwise returns 0
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| 278 | */
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| 279 | int serial_irq_handler_asynch(serial_t *obj);
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| 280 |
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| 281 | /** Abort the ongoing TX transaction. It disables the enabled interupt for TX and
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| 282 | * flushes the TX hardware buffer if TX FIFO is used
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| 283 | *
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| 284 | * @param obj The serial object
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| 285 | */
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| 286 | void serial_tx_abort_asynch(serial_t *obj);
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| 287 |
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| 288 | /** Abort the ongoing RX transaction. It disables the enabled interrupt for RX and
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| 289 | * flushes the RX hardware buffer if RX FIFO is used
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| 290 | *
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| 291 | * @param obj The serial object
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| 292 | */
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| 293 | void serial_rx_abort_asynch(serial_t *obj);
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| 294 |
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| 295 | /**@}*/
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| 296 |
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| 297 | #endif
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| 298 |
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| 299 | #ifdef __cplusplus
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| 300 | }
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| 301 | #endif
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| 302 |
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| 303 | #endif
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| 304 |
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| 305 | #endif
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| 306 |
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| 307 | /** @}*/
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