circuitpython/nrf5/hal/hal_twie.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Glenn Ruben Bakke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "mphalport.h"
#include "hal_twi.h"
#ifdef HAL_TWIE_MODULE_ENABLED
// EasyDMA variants
#define TWI_MASTER_BASE(x) ((NRF_TWIM_Type *)TWI_BASE_POINTERS[x])
#define TWI_SLAVE_BASE(x) ((NRF_TWIS_Type *)TWI_BASE_POINTERS[x])
static const uint32_t hal_twi_frequency_lookup[] = {
TWIM_FREQUENCY_FREQUENCY_K100, // 100 kbps
TWIM_FREQUENCY_FREQUENCY_K250, // 250 kbps
TWIM_FREQUENCY_FREQUENCY_K400, // 400 kbps
};
void hal_twi_master_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
// cast to master type
NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
twim_instance->PSEL.SCL = p_twi_init->scl_pin->pin;
twim_instance->PSEL.SDA = p_twi_init->sda_pin->pin;
#if NRF52840_XXAA
twim_instance->PSEL.SCL |= (p_twi_init->scl_pin->port << TWIM_PSEL_SCL_PORT_Pos);
twim_instance->PSEL.SDA |= (p_twi_init->sda_pin->port << TWIM_PSEL_SDA_PORT_Pos);
#endif
twim_instance->FREQUENCY = hal_twi_frequency_lookup[p_twi_init->freq];
twim_instance->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
}
#include <stdio.h>
void hal_twi_master_tx(NRF_TWI_Type * p_instance,
uint8_t addr,
uint16_t transfer_size,
const uint8_t * tx_data,
bool stop) {
// cast to master type
NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
twim_instance->ADDRESS = addr;
printf("Hal I2C transfer size: %u, addr: %x, stop: %u\n", transfer_size, addr, stop);
twim_instance->TXD.MAXCNT = transfer_size;
twim_instance->TXD.PTR = (uint32_t)tx_data;
if (stop) {
twim_instance->SHORTS = TWIM_SHORTS_LASTTX_STOP_Msk;
} else {
twim_instance->SHORTS = TWIM_SHORTS_LASTTX_SUSPEND_Msk;
}
if (twim_instance->EVENTS_SUSPENDED == 1) {
printf("Resuming\n");
twim_instance->EVENTS_SUSPENDED = 0;
twim_instance->EVENTS_STOPPED = 0;
twim_instance->TASKS_RESUME = 1; // in case of resume
} else {
printf("Starting\n");
twim_instance->EVENTS_SUSPENDED = 0;
twim_instance->EVENTS_STOPPED = 0;
twim_instance->TASKS_STARTTX = 1;
}
printf("Going into loop\n");
while (twim_instance->EVENTS_STOPPED == 0 && twim_instance->EVENTS_SUSPENDED == 0) {
;
}
}
void hal_twi_master_rx(NRF_TWI_Type * p_instance,
uint8_t addr,
uint16_t transfer_size,
const uint8_t * rx_data) {
// cast to master type
NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
twim_instance->ADDRESS = addr;
}
void hal_twi_slave_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
// cast to slave type
NRF_TWIS_Type * twis_instance = (NRF_TWIS_Type *)p_instance;
(void)twis_instance;
}
#endif // HAL_TWIE_MODULE_ENABLED