243 lines
9.8 KiB
C
243 lines
9.8 KiB
C
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/**
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* Copyright (c) 2012 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**
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@defgroup dtm_standalone main.c
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@{
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@ingroup ble_sdk_app_dtm_serial
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@brief Stand-alone DTM application for UART interface.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "nrf.h"
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#include "ble_dtm.h"
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#include "nrf_gpio.h"
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#include "dtm_uart.h"
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#include "nrf_error.h"
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#include "app_util.h"
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#include "nrf_drv_uart.h"
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#include "nrf_peripherals.h"
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#include "app_util_platform.h"
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//Configuration parameters.
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#define BITRATE UART_BAUDRATE_BAUDRATE_Baud57600 /**< Serial bitrate on the UART */
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//@note: The BLE DTM 2-wire UART standard specifies 8 data bits, 1 stop bit, no flow control.
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//These parameters are not configurable in the BLE standard.
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/**@details Maximum iterations needed in the main loop between stop bit 1st byte and start bit 2nd
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* byte. DTM standard allows 5000us delay between stop bit 1st byte and start bit 2nd byte.
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* As the time is only known when a byte is received, then the time between between stop bit 1st
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* byte and stop bit 2nd byte becomes:
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* 5000us + transmission time of 2nd byte.
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*
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* Byte transmission time is (Baud rate of 19200):
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* 10bits * 1/19200 = approx. 520 us/byte (8 data bits + start & stop bit).
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*
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* Loop time on polling UART register for received byte is defined in ble_dtm.c as:
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* UART_POLL_CYCLE = 260 us
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*
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* The max time between two bytes thus becomes (loop time: 260us / iteration):
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* (5000us + 520us) / 260us / iteration = 21.2 iterations.
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*
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* This is rounded down to 21.
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*
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* @note If UART bit rate is changed, this value should be recalculated as well.
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*/
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static uint32_t m_baud_rates[] = {[UART_BAUD_RATE_1200] = NRF_UART_BAUDRATE_1200,
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[UART_BAUD_RATE_2400] = NRF_UART_BAUDRATE_2400,
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[UART_BAUD_RATE_4800] = NRF_UART_BAUDRATE_4800,
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[UART_BAUD_RATE_9600] = NRF_UART_BAUDRATE_9600,
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[UART_BAUD_RATE_14400] = NRF_UART_BAUDRATE_14400,
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[UART_BAUD_RATE_19200] = NRF_UART_BAUDRATE_19200,
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[UART_BAUD_RATE_28800] = NRF_UART_BAUDRATE_28800,
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[UART_BAUD_RATE_38400] = NRF_UART_BAUDRATE_38400,
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[UART_BAUD_RATE_57600] = NRF_UART_BAUDRATE_57600,
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[UART_BAUD_RATE_76800] = NRF_UART_BAUDRATE_76800,
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[UART_BAUD_RATE_115200] = NRF_UART_BAUDRATE_115200 };
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static uint32_t m_iteration[] = {[UART_BAUD_RATE_1200] = 51,
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[UART_BAUD_RATE_2400] = 35,
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[UART_BAUD_RATE_4800] = 27,
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[UART_BAUD_RATE_9600] = 23,
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[UART_BAUD_RATE_14400] = 21,
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[UART_BAUD_RATE_19200] = 21,
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[UART_BAUD_RATE_28800] = 20,
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[UART_BAUD_RATE_38400] = 20,
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[UART_BAUD_RATE_57600] = 19,
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[UART_BAUD_RATE_76800] = 19,
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[UART_BAUD_RATE_115200] = 19, };
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static uint32_t m_iterations_next_byte_max = 51;
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static nrf_drv_uart_t m_dtm_uart_driver = NRF_DRV_UART_INSTANCE(0);
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/**@brief Function for UART initialization.
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*/
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static uint32_t uart_init(app_uart_stream_comm_params_t * p_comm_params)
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{
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if (p_comm_params->baud_rate > UART_BAUD_RATE_115200)
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{
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return NRF_ERROR_INVALID_PARAM;
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}
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nrf_drv_uart_config_t config = NRF_DRV_UART_DEFAULT_CONFIG;
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config.pselrxd = p_comm_params->rx_pin_no;
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config.pseltxd = p_comm_params->tx_pin_no;
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config.baudrate = (nrf_uart_baudrate_t) m_baud_rates[p_comm_params->baud_rate];
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config.hwfc = NRF_UART_HWFC_DISABLED;
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config.parity = NRF_UART_PARITY_EXCLUDED;
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#if defined(NRF_DRV_UART_WITH_UARTE) && defined(NRF_DRV_UART_WITH_UART)
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//Current implementation of DTM requires legacy UART features and
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// it will not work on nrf52810.
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config.use_easy_dma = false;
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#endif
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nrf_drv_uart_uninit(&m_dtm_uart_driver);
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uint32_t err_code = nrf_drv_uart_init(&m_dtm_uart_driver, &config, NULL);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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nrf_drv_uart_rx_enable(&m_dtm_uart_driver);
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m_iterations_next_byte_max = m_iteration[p_comm_params->baud_rate];
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return NRF_SUCCESS;
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}
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/**@brief Function for application main entry.
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*
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* @details This function serves as an adaptation layer between a 2-wire UART interface and the
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* dtmlib. After initialization, DTM commands submitted through the UART are forwarded to
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* dtmlib and events (i.e. results from the command) is reported back through the UART.
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*/
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uint32_t dtm_start(app_uart_stream_comm_params_t uart_comm_params)
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{
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uint32_t current_time;
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uint32_t dtm_error_code;
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uint32_t msb_time = 0; //Time when MSB of the DTM command was read. Used to catch stray bytes from "misbehaving" testers.
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bool is_msb_read = false; //True when MSB of the DTM command has been read and the application is waiting for LSB.
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uint16_t dtm_cmd_from_uart = 0; //Packed command containing command_code:freqency:length:payload in 2:6:6:2 bits.
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uint8_t rx_byte; //Last byte read from UART.
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dtm_event_t result; //Result of a DTM operation.
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uint32_t err_code;
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err_code = uart_init(&uart_comm_params);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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dtm_error_code = dtm_init();
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if (dtm_error_code != DTM_SUCCESS)
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{
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//If DTM cannot be correctly initialized, then we just return.
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return NRF_ERROR_INTERNAL;
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}
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for (;; )
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{
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//Will return every timeout, 625 us.
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current_time = dtm_wait();
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if (NRF_SUCCESS != nrf_drv_uart_rx(&m_dtm_uart_driver, &rx_byte,1))
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{
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return NRF_ERROR_INTERNAL;
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}
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if (!is_msb_read)
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{
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//This is first byte of two-byte command.
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is_msb_read = true;
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dtm_cmd_from_uart = ((dtm_cmd_t)rx_byte) << 8;
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msb_time = current_time;
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//Go back and wait for 2nd byte of command word.
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continue;
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}
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//This is the second byte read; combine it with the first and process command
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if (current_time > (msb_time + m_iterations_next_byte_max))
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{
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//More than ~5mS after msb: Drop old byte, take the new byte as MSB.
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//The variable is_msb_read will remains true.
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//Go back and wait for 2nd byte of the command word.
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dtm_cmd_from_uart = ((dtm_cmd_t)rx_byte) << 8;
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msb_time = current_time;
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continue;
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}
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//2-byte UART command received.
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is_msb_read = false;
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dtm_cmd_from_uart |= (dtm_cmd_t)rx_byte;
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if (dtm_cmd(dtm_cmd_from_uart) != DTM_SUCCESS)
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{
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//Extended error handling may be put here.
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//Default behavior is to return the event on the UART (see below);
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//the event report will reflect any lack of success.
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}
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//Retrieve result of the operation. This implementation will busy-loop
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//for the duration of the byte transmissions on the UART.
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if (dtm_event_get(&result))
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{
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//Report command status on the UART.
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uint8_t tx_byte = (result >> 8) & 0xFF;
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//Transmit MSB of the result.
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(void)nrf_drv_uart_tx(&m_dtm_uart_driver, &tx_byte, 1);
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//Transmit LSB of the result.
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tx_byte = result & 0xFF;
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(void)nrf_drv_uart_tx(&m_dtm_uart_driver, &tx_byte, 1);
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}
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}
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}
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/// @}
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