134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "mphalport.h"
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#include "hal_twi.h"
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#ifdef HAL_TWI_MODULE_ENABLED
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static const uint32_t hal_twi_frequency_lookup[] = {
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TWI_FREQUENCY_FREQUENCY_K100, // 100 kbps
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TWI_FREQUENCY_FREQUENCY_K250, // 250 kbps
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TWI_FREQUENCY_FREQUENCY_K400, // 400 kbps
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};
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void hal_twi_master_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
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#if NRF52840_XXAA
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p_instance->PSEL.SCL = p_twi_init->scl_pin->pin;
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p_instance->PSEL.SDA = p_twi_init->sda_pin->pin;
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p_instance->PSEL.SCL |= (p_twi_init->scl_pin->port << TWI_PSEL_SCL_PORT_Pos);
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p_instance->PSEL.SDA |= (p_twi_init->sda_pin->port << TWI_PSEL_SDA_PORT_Pos);
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#else
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p_instance->PSELSCL = p_twi_init->scl_pin->pin;
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p_instance->PSELSDA = p_twi_init->sda_pin->pin;
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#endif
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p_instance->FREQUENCY = hal_twi_frequency_lookup[p_twi_init->freq];
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p_instance->ENABLE = (TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos);
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}
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#include <stdio.h>
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void hal_twi_master_tx(NRF_TWI_Type * p_instance,
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uint8_t addr,
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uint16_t transfer_size,
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const uint8_t * tx_data,
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bool stop) {
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uint16_t number_of_txd_bytes = 0;
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p_instance->ADDRESS = addr;
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p_instance->EVENTS_TXDSENT = 0;
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p_instance->TXD = tx_data[number_of_txd_bytes];
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p_instance->TASKS_STARTTX = 1;
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while (number_of_txd_bytes < transfer_size) {
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// wait for the transaction complete
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while (p_instance->EVENTS_TXDSENT == 0) {
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;
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}
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number_of_txd_bytes++;
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// TODO: This could go one byte out of bound.
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p_instance->TXD = tx_data[number_of_txd_bytes];
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p_instance->EVENTS_TXDSENT = 0;
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}
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if (stop) {
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p_instance->EVENTS_STOPPED = 0;
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p_instance->TASKS_STOP = 1;
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while (p_instance->EVENTS_STOPPED == 0) {
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;
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}
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}
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}
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void hal_twi_master_rx(NRF_TWI_Type * p_instance,
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uint8_t addr,
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uint16_t transfer_size,
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uint8_t * rx_data,
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bool stop) {
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uint16_t number_of_rxd_bytes = 0;
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p_instance->ADDRESS = addr;
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p_instance->EVENTS_RXDREADY = 0;
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p_instance->TASKS_STARTRX = 1;
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while (number_of_rxd_bytes < transfer_size) {
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// wait for the transaction complete
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while (p_instance->EVENTS_RXDREADY == 0) {
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;
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}
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rx_data[number_of_rxd_bytes] = p_instance->RXD;
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p_instance->EVENTS_RXDREADY = 0;
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number_of_rxd_bytes++;
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}
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if (stop) {
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p_instance->EVENTS_STOPPED = 0;
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p_instance->TASKS_STOP = 1;
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while (p_instance->EVENTS_STOPPED == 0) {
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;
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}
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}
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}
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void hal_twi_slave_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
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}
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#endif // HAL_TWI_MODULE_ENABLED
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