kopia lustrzana https://github.com/micropython/micropython
116 wiersze
4.1 KiB
C
116 wiersze
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_TWIE_MODULE_ENABLED
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// EasyDMA variants
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#define TWI_MASTER_BASE(x) ((NRF_TWIM_Type *)TWI_BASE_POINTERS[x])
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#define TWI_SLAVE_BASE(x) ((NRF_TWIS_Type *)TWI_BASE_POINTERS[x])
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static const uint32_t hal_twi_frequency_lookup[] = {
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TWIM_FREQUENCY_FREQUENCY_K100, // 100 kbps
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TWIM_FREQUENCY_FREQUENCY_K250, // 250 kbps
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TWIM_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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// cast to master type
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NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
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twim_instance->PSEL.SCL = p_twi_init->scl_pin->pin;
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twim_instance->PSEL.SDA = p_twi_init->sda_pin->pin;
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#if NRF52840_XXAA
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twim_instance->PSEL.SCL |= (p_twi_init->scl_pin->port << TWIM_PSEL_SCL_PORT_Pos);
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twim_instance->PSEL.SDA |= (p_twi_init->sda_pin->port << TWIM_PSEL_SDA_PORT_Pos);
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#endif
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twim_instance->FREQUENCY = hal_twi_frequency_lookup[p_twi_init->freq];
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twim_instance->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_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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// cast to master type
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NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
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twim_instance->ADDRESS = addr;
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printf("Hal I2C transfer size: %u, addr: %x, stop: %u\n", transfer_size, addr, stop);
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twim_instance->TXD.MAXCNT = transfer_size;
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twim_instance->TXD.PTR = (uint32_t)tx_data;
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if (stop) {
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twim_instance->SHORTS = TWIM_SHORTS_LASTTX_STOP_Msk;
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} else {
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twim_instance->SHORTS = TWIM_SHORTS_LASTTX_SUSPEND_Msk;
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}
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if (twim_instance->EVENTS_SUSPENDED == 1) {
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printf("Resuming\n");
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twim_instance->EVENTS_SUSPENDED = 0;
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twim_instance->EVENTS_STOPPED = 0;
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twim_instance->TASKS_RESUME = 1; // in case of resume
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} else {
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printf("Starting\n");
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twim_instance->EVENTS_SUSPENDED = 0;
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twim_instance->EVENTS_STOPPED = 0;
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twim_instance->TASKS_STARTTX = 1;
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}
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printf("Going into loop\n");
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while (twim_instance->EVENTS_STOPPED == 0 && twim_instance->EVENTS_SUSPENDED == 0) {
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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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const uint8_t * rx_data) {
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// cast to master type
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NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
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twim_instance->ADDRESS = addr;
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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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// cast to slave type
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NRF_TWIS_Type * twis_instance = (NRF_TWIS_Type *)p_instance;
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(void)twis_instance;
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}
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#endif // HAL_TWIE_MODULE_ENABLED
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