117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
/*
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This file is part of the MKR WiFi 1010 firmware.
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Copyright (C) 2018 Arduino AG (http://www.arduino.cc/)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <driver/gpio.h>
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#include <driver/spi_slave.h>
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#include "wiring_digital.h"
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#include "WInterrupts.h"
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#include "SPIS.h"
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SPISClass::SPISClass(spi_host_device_t hostDevice, int dmaChannel, int mosiPin, int misoPin, int sclkPin, int csPin, int readyPin) :
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_hostDevice(hostDevice),
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_dmaChannel(dmaChannel),
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_mosiPin(mosiPin),
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_misoPin(misoPin),
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_sclkPin(sclkPin),
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_csPin(csPin),
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_readyPin(readyPin)
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{
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}
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int SPISClass::begin()
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{
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spi_bus_config_t busCfg;
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spi_slave_interface_config_t slvCfg;
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pinMode(_readyPin, OUTPUT);
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digitalWrite(_readyPin, HIGH);
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_readySemaphore = xSemaphoreCreateCounting(1, 0);
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attachInterrupt(_csPin, onChipSelect, FALLING);
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memset(&busCfg, 0x00, sizeof(busCfg));
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busCfg.mosi_io_num = _mosiPin;
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busCfg.miso_io_num = _misoPin;
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busCfg.sclk_io_num = _sclkPin;
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memset(&slvCfg, 0x00, sizeof(slvCfg));
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slvCfg.mode = 0;
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slvCfg.spics_io_num = _csPin;
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slvCfg.queue_size = 1;
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slvCfg.flags = 0;
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slvCfg.post_setup_cb = SPISClass::onSetupComplete;
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slvCfg.post_trans_cb = NULL;
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gpio_set_pull_mode((gpio_num_t)_mosiPin, GPIO_FLOATING);
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gpio_set_pull_mode((gpio_num_t)_sclkPin, GPIO_PULLDOWN_ONLY);
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gpio_set_pull_mode((gpio_num_t)_csPin, GPIO_PULLUP_ONLY);
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spi_slave_initialize(_hostDevice, &busCfg, &slvCfg, _dmaChannel);
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return 1;
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}
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int SPISClass::transfer(uint8_t out[], uint8_t in[], size_t len)
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{
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spi_slave_transaction_t slvTrans;
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spi_slave_transaction_t* slvRetTrans;
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memset(&slvTrans, 0x00, sizeof(slvTrans));
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slvTrans.length = len * 8;
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slvTrans.trans_len = 0;
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slvTrans.tx_buffer = out;
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slvTrans.rx_buffer = in;
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spi_slave_queue_trans(_hostDevice, &slvTrans, portMAX_DELAY);
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xSemaphoreTake(_readySemaphore, portMAX_DELAY);
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digitalWrite(_readyPin, LOW);
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spi_slave_get_trans_result(_hostDevice, &slvRetTrans, portMAX_DELAY);
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digitalWrite(_readyPin, HIGH);
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return (slvTrans.trans_len / 8);
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}
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void SPISClass::onChipSelect()
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{
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SPIS.handleOnChipSelect();
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}
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void SPISClass::handleOnChipSelect()
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{
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digitalWrite(_readyPin, HIGH);
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}
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void SPISClass::onSetupComplete(spi_slave_transaction_t*)
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{
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SPIS.handleSetupComplete();
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}
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void SPISClass::handleSetupComplete()
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{
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xSemaphoreGiveFromISR(_readySemaphore, NULL);
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}
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SPISClass SPIS(VSPI_HOST, 1, 12, 23, 18, 5, 33);
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