diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/uart/app_uart_fifo.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/uart/app_uart_fifo.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/uart/app_uart_fifo.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/uart/app_uart_fifo.c new file mode 100644 index 0000000..7ff7bd8 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/uart/app_uart_fifo.c @@ -0,0 +1,244 @@ +/** + * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, must reproduce the above copyright notice, this list of + * conditions and the following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#include "sdk_common.h" +#if NRF_MODULE_ENABLED(APP_UART) +#include "app_uart.h" +#include "app_fifo.h" +#include "nrf_drv_uart.h" +#include "nrf_assert.h" + +static nrf_drv_uart_t app_uart_inst = NRF_DRV_UART_INSTANCE(APP_UART_DRIVER_INSTANCE); + +static __INLINE uint32_t fifo_length(app_fifo_t * const fifo) +{ + uint32_t tmp = fifo->read_pos; + return fifo->write_pos - tmp; +} + +#define FIFO_LENGTH(F) fifo_length(&F) /**< Macro to calculate length of a FIFO. */ + + +static app_uart_event_handler_t m_event_handler; /**< Event handler function. */ +static uint8_t tx_buffer[1]; +static uint8_t rx_buffer[1]; +static bool m_rx_ovf; + +static app_fifo_t m_rx_fifo; /**< RX FIFO buffer for storing data received on the UART until the application fetches them using app_uart_get(). */ +static app_fifo_t m_tx_fifo; /**< TX FIFO buffer for storing data to be transmitted on the UART when TXD is ready. Data is put to the buffer on using app_uart_put(). */ + +static void uart_event_handler(nrf_drv_uart_event_t * p_event, void* p_context) +{ + app_uart_evt_t app_uart_event; + uint32_t err_code; + + switch (p_event->type) + { + case NRF_DRV_UART_EVT_RX_DONE: + // Write received byte to FIFO. + err_code = app_fifo_put(&m_rx_fifo, p_event->data.rxtx.p_data[0]); + if (err_code != NRF_SUCCESS) + { + app_uart_event.evt_type = APP_UART_FIFO_ERROR; + app_uart_event.data.error_code = err_code; + m_event_handler(&app_uart_event); + } + // Notify that there are data available. + else if (FIFO_LENGTH(m_rx_fifo) != 0) + { + app_uart_event.evt_type = APP_UART_DATA_READY; + m_event_handler(&app_uart_event); + } + + // Start new RX if size in buffer. + if (FIFO_LENGTH(m_rx_fifo) <= m_rx_fifo.buf_size_mask) + { + (void)nrf_drv_uart_rx(&app_uart_inst, rx_buffer, 1); + } + else + { + // Overflow in RX FIFO. + m_rx_ovf = true; + } + + break; + + case NRF_DRV_UART_EVT_ERROR: + app_uart_event.evt_type = APP_UART_COMMUNICATION_ERROR; + app_uart_event.data.error_communication = p_event->data.error.error_mask; + (void)nrf_drv_uart_rx(&app_uart_inst, rx_buffer, 1); + m_event_handler(&app_uart_event); + break; + + case NRF_DRV_UART_EVT_TX_DONE: + // Get next byte from FIFO. + if (app_fifo_get(&m_tx_fifo, tx_buffer) == NRF_SUCCESS) + { + (void)nrf_drv_uart_tx(&app_uart_inst, tx_buffer, 1); + } + else + { + // Last byte from FIFO transmitted, notify the application. + app_uart_event.evt_type = APP_UART_TX_EMPTY; + m_event_handler(&app_uart_event); + } + break; + + default: + break; + } +} + + +uint32_t app_uart_init(const app_uart_comm_params_t * p_comm_params, + app_uart_buffers_t * p_buffers, + app_uart_event_handler_t event_handler, + app_irq_priority_t irq_priority) +{ + uint32_t err_code; + + m_event_handler = event_handler; + + if (p_buffers == NULL) + { + return NRF_ERROR_INVALID_PARAM; + } + + // Configure buffer RX buffer. + err_code = app_fifo_init(&m_rx_fifo, p_buffers->rx_buf, p_buffers->rx_buf_size); + VERIFY_SUCCESS(err_code); + + // Configure buffer TX buffer. + err_code = app_fifo_init(&m_tx_fifo, p_buffers->tx_buf, p_buffers->tx_buf_size); + VERIFY_SUCCESS(err_code); + + nrf_drv_uart_config_t config = NRF_DRV_UART_DEFAULT_CONFIG; + config.baudrate = (nrf_uart_baudrate_t)p_comm_params->baud_rate; + config.hwfc = (p_comm_params->flow_control == APP_UART_FLOW_CONTROL_DISABLED) ? + NRF_UART_HWFC_DISABLED : NRF_UART_HWFC_ENABLED; + config.interrupt_priority = irq_priority; + config.parity = p_comm_params->use_parity ? NRF_UART_PARITY_INCLUDED : NRF_UART_PARITY_EXCLUDED; + config.pselcts = p_comm_params->cts_pin_no; + config.pselrts = p_comm_params->rts_pin_no; + config.pselrxd = p_comm_params->rx_pin_no; + config.pseltxd = p_comm_params->tx_pin_no; + + err_code = nrf_drv_uart_init(&app_uart_inst, &config, uart_event_handler); + VERIFY_SUCCESS(err_code); + m_rx_ovf = false; + + // Turn on receiver if RX pin is connected + if (p_comm_params->rx_pin_no != UART_PIN_DISCONNECTED) + { + return nrf_drv_uart_rx(&app_uart_inst, rx_buffer,1); + } + else + { + return NRF_SUCCESS; + } +} + + +uint32_t app_uart_flush(void) +{ + uint32_t err_code; + + err_code = app_fifo_flush(&m_rx_fifo); + VERIFY_SUCCESS(err_code); + + err_code = app_fifo_flush(&m_tx_fifo); + VERIFY_SUCCESS(err_code); + + return NRF_SUCCESS; +} + + +uint32_t app_uart_get(uint8_t * p_byte) +{ + ASSERT(p_byte); + bool rx_ovf = m_rx_ovf; + + ret_code_t err_code = app_fifo_get(&m_rx_fifo, p_byte); + + // If FIFO was full new request to receive one byte was not scheduled. Must be done here. + if (rx_ovf) + { + m_rx_ovf = false; + uint32_t uart_err_code = nrf_drv_uart_rx(&app_uart_inst, rx_buffer, 1); + + // RX resume should never fail. + APP_ERROR_CHECK(uart_err_code); + } + + return err_code; +} + + +uint32_t app_uart_put(uint8_t byte) +{ + uint32_t err_code; + err_code = app_fifo_put(&m_tx_fifo, byte); + if (err_code == NRF_SUCCESS) + { + // The new byte has been added to FIFO. It will be picked up from there + // (in 'uart_event_handler') when all preceding bytes are transmitted. + // But if UART is not transmitting anything at the moment, we must start + // a new transmission here. + if (!nrf_drv_uart_tx_in_progress(&app_uart_inst)) + { + // This operation should be almost always successful, since we've + // just added a byte to FIFO, but if some bigger delay occurred + // (some heavy interrupt handler routine has been executed) since + // that time, FIFO might be empty already. + if (app_fifo_get(&m_tx_fifo, tx_buffer) == NRF_SUCCESS) + { + err_code = nrf_drv_uart_tx(&app_uart_inst, tx_buffer, 1); + } + } + } + return err_code; +} + + +uint32_t app_uart_close(void) +{ + nrf_drv_uart_uninit(&app_uart_inst); + return NRF_SUCCESS; +} +#endif //NRF_MODULE_ENABLED(APP_UART) |