test test test
Diff: snake-test/mbed/hal/serial_api.h
- Revision:
- 0:e4c5e6ec922e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/snake-test/mbed/hal/serial_api.h Mon May 25 19:06:11 2020 +0000 @@ -0,0 +1,307 @@ + +/** \addtogroup hal */ +/** @{*/ +/* 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 "hal/buffer.h" +#include "hal/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 hal_GeneralSerial Serial Configuration Functions + * @{ + */ + +/** Initialize the serial peripheral. It sets the default parameters for serial + * peripheral, and configures its specifieds pins. + * + * @param obj The serial object + * @param tx The TX pin name + * @param rx The RX pin name + */ +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 the 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); + +/** Send 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 name 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 name + * @param txflow The RX pin name + */ +void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow); + +#if DEVICE_SERIAL_ASYNCH + +/**@}*/ + +/** + * \defgroup hal_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 transmit buffer + * @param tx_length The number of bytes to transmit + * @param tx_width Deprecated argument + * @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, otherwise returns 0 + */ +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 receive buffer + * @param rx_length The number of bytes to receive + * @param rx_width Deprecated argument + * @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 an RX transfer termination condition was met; otherwise returns 0 + */ +int serial_irq_handler_asynch(serial_t *obj); + +/** Abort the ongoing TX transaction. It disables the enabled interupt for TX and + * flushes the 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 + * flushes the 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 + +/** @}*/