Diff: mbed/serial_api.h

Revision:

3:78f223d34f36

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed/serial_api.h	Tue Mar 05 02:34:44 2019 +0000
@@ -0,0 +1,302 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_SERIAL_API_H
+#define MBED_SERIAL_API_H
+
+#include "device.h"
+#include "buffer.h"
+#include "dma_api.h"
+
+#if DEVICE_SERIAL
+
+#define SERIAL_EVENT_TX_SHIFT (2)
+#define SERIAL_EVENT_RX_SHIFT (8)
+
+#define SERIAL_EVENT_TX_MASK (0x00FC)
+#define SERIAL_EVENT_RX_MASK (0x3F00)
+
+#define SERIAL_EVENT_ERROR (1 << 1)
+
+/**
+ * @defgroup SerialTXEvents Serial TX Events Macros
+ *
+ * @{
+ */
+#define SERIAL_EVENT_TX_COMPLETE (1 << (SERIAL_EVENT_TX_SHIFT + 0))
+#define SERIAL_EVENT_TX_ALL      (SERIAL_EVENT_TX_COMPLETE)
+/**@}*/
+
+/**
+ * @defgroup SerialRXEvents Serial RX Events Macros
+ *
+ * @{
+ */
+#define SERIAL_EVENT_RX_COMPLETE        (1 << (SERIAL_EVENT_RX_SHIFT + 0))
+#define SERIAL_EVENT_RX_OVERRUN_ERROR   (1 << (SERIAL_EVENT_RX_SHIFT + 1))
+#define SERIAL_EVENT_RX_FRAMING_ERROR   (1 << (SERIAL_EVENT_RX_SHIFT + 2))
+#define SERIAL_EVENT_RX_PARITY_ERROR    (1 << (SERIAL_EVENT_RX_SHIFT + 3))
+#define SERIAL_EVENT_RX_OVERFLOW        (1 << (SERIAL_EVENT_RX_SHIFT + 4))
+#define SERIAL_EVENT_RX_CHARACTER_MATCH (1 << (SERIAL_EVENT_RX_SHIFT + 5))
+#define SERIAL_EVENT_RX_ALL             (SERIAL_EVENT_RX_OVERFLOW | SERIAL_EVENT_RX_PARITY_ERROR | \
+                                         SERIAL_EVENT_RX_FRAMING_ERROR | SERIAL_EVENT_RX_OVERRUN_ERROR | \
+                                         SERIAL_EVENT_RX_COMPLETE | SERIAL_EVENT_RX_CHARACTER_MATCH)
+/**@}*/
+
+#define SERIAL_RESERVED_CHAR_MATCH (255)
+
+typedef enum {
+    ParityNone = 0,
+    ParityOdd = 1,
+    ParityEven = 2,
+    ParityForced1 = 3,
+    ParityForced0 = 4
+} SerialParity;
+
+typedef enum {
+    RxIrq,
+    TxIrq
+} SerialIrq;
+
+typedef enum {
+    FlowControlNone,
+    FlowControlRTS,
+    FlowControlCTS,
+    FlowControlRTSCTS
+} FlowControl;
+
+typedef void (*uart_irq_handler)(uint32_t id, SerialIrq event);
+
+#if DEVICE_SERIAL_ASYNCH
+/** Asynch serial hal structure
+ */
+typedef struct {
+    struct serial_s serial;  /**< Target specific serial structure */
+    struct buffer_s tx_buff; /**< Tx buffer */
+    struct buffer_s rx_buff; /**< Rx buffer */
+    uint8_t char_match;      /**< Character to be matched */
+    uint8_t char_found;      /**< State of the matched character */
+} serial_t;
+
+#else
+/** Non-asynch serial hal structure
+ */
+typedef struct serial_s serial_t;
+
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \defgroup GeneralSerial Serial Configuration Functions
+ * @{
+ */
+
+/** Initialize the serial peripheral. It sets the default parameters for serial
+ *  peripheral, and configure its specifieds pins.
+ *
+ * @param obj The serial object
+ * @param tx  The TX pin
+ * @param rx  The RX pin
+ */
+void serial_init(serial_t *obj, PinName tx, PinName rx);
+
+/** Release the serial peripheral, not currently invoked. It requires further
+ *  resource management.
+ *
+ * @param obj The serial object
+ */
+void serial_free(serial_t *obj);
+
+/** Configure the baud rate
+ *
+ * @param obj      The serial object
+ * @param baudrate The baud rate to be configured
+ */
+void serial_baud(serial_t *obj, int baudrate);
+
+/** Configure the format. Set the number of bits, parity and the number of stop bits
+ *
+ * @param obj       The serial object
+ * @param data_bits The number of data bits
+ * @param parity    The parity
+ * @param stop_bits The number of stop bits
+ */
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits);
+
+/** The serial interrupt handler registration.
+ *
+ * @param obj     The serial object
+ * @param handler The interrupt handler which will be invoked when interrupt fires.
+ * @param id      The SerialBase object
+ */
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id);
+
+/** Configure serial interrupt. This function is used for word-approach
+ *
+ * @param obj    The serial object
+ * @param irq    The serial IRQ type (RX or TX)
+ * @param enable Set to non-zero to enable events, or zero to disable them
+ */
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable);
+
+/** Get character. This is a blocking call, waiting for a character
+ *
+ * @param obj The serial object
+ */
+int  serial_getc(serial_t *obj);
+
+/** Put a character. This is a blocking call, waiting for a peripheral to be available
+ *  for writing
+ *
+ * @param obj The serial object
+ * @param c   The character to be sent
+ */
+void serial_putc(serial_t *obj, int c);
+
+/** Check if the serial peripheral is readable
+ *
+ * @param obj The serial object
+ * @return Non-zero value if a character can be read, 0 if nothing to read.
+ */
+int  serial_readable(serial_t *obj);
+
+/** Check if the serial peripheral is writable
+ *
+ * @param obj The serial object
+ * @return Non-zero value if a character can be written, 0 otherwise.
+ */
+int  serial_writable(serial_t *obj);
+
+/** Clear the serial peripheral
+ *
+ * @param obj The serial object
+ */
+void serial_clear(serial_t *obj);
+
+/** Set the break
+ *
+ * @param obj The serial object
+ */
+void serial_break_set(serial_t *obj);
+
+/** Clear the break
+ *
+ * @param obj The serial object
+ */
+void serial_break_clear(serial_t *obj);
+
+/** Configure the TX pin for UART function.
+ *
+ * @param tx The pin used for TX
+ */
+void serial_pinout_tx(PinName tx);
+
+/** Configure the serial for the flow control. It sets flow control in the hardware
+ *  if a serial peripheral supports it, otherwise software emulation is used.
+ *
+ * @param obj    The serial object
+ * @param type   The type of the flow control. Look at the available FlowControl types.
+ * @param rxflow The tx pin
+ * @param txflow The rx pin
+ */
+void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow);
+
+#if DEVICE_SERIAL_ASYNCH
+
+/**@}*/
+
+/**
+ * \defgroup AsynchSerial Asynchronous Serial Hardware Abstraction Layer
+ * @{
+ */
+
+/** Begin asynchronous TX transfer. The used buffer is specified in the serial object,
+ *  tx_buff
+ *
+ * @param obj       The serial object
+ * @param tx        The buffer for sending
+ * @param tx_length The number of words to transmit
+ * @param tx_width  The bit width of buffer word
+ * @param handler   The serial handler
+ * @param event     The logical OR of events to be registered
+ * @param hint      A suggestion for how to use DMA with this transfer
+ * @return Returns number of data transfered, or 0 otherwise
+ */
+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);
+
+/** Begin asynchronous RX transfer (enable interrupt for data collecting)
+ *  The used buffer is specified in the serial object - rx_buff
+ *
+ * @param obj        The serial object
+ * @param rx         The buffer for sending
+ * @param rx_length  The number of words to transmit
+ * @param rx_width   The bit width of buffer word
+ * @param handler    The serial handler
+ * @param event      The logical OR of events to be registered
+ * @param handler    The serial handler
+ * @param char_match A character in range 0-254 to be matched
+ * @param hint       A suggestion for how to use DMA with this transfer
+ */
+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);
+
+/** Attempts to determine if the serial peripheral is already in use for TX
+ *
+ * @param obj The serial object
+ * @return Non-zero if the RX transaction is ongoing, 0 otherwise
+ */
+uint8_t serial_tx_active(serial_t *obj);
+
+/** Attempts to determine if the serial peripheral is already in use for RX
+ *
+ * @param obj The serial object
+ * @return Non-zero if the RX transaction is ongoing, 0 otherwise
+ */
+uint8_t serial_rx_active(serial_t *obj);
+
+/** The asynchronous TX and RX handler.
+ *
+ * @param obj The serial object
+ * @return Returns event flags if a RX transfer termination condition was met or 0 otherwise
+ */
+int serial_irq_handler_asynch(serial_t *obj);
+
+/** Abort the ongoing TX transaction. It disables the enabled interupt for TX and
+ *  flush TX hardware buffer if TX FIFO is used
+ *
+ * @param obj The serial object
+ */
+void serial_tx_abort_asynch(serial_t *obj);
+
+/** Abort the ongoing RX transaction It disables the enabled interrupt for RX and
+ *  flush RX hardware buffer if RX FIFO is used
+ *
+ * @param obj The serial object
+ */
+void serial_rx_abort_asynch(serial_t *obj);
+
+/**@}*/
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#endif