121 lines
4 KiB
C++
121 lines
4 KiB
C++
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/*
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; Project: Open Vehicle Monitor System
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; Date: 14th March 2017
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;
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; Changes:
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; 1.0 Initial release
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;
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; (C) 2011 Michael Stegen / Stegen Electronics
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; (C) 2011-2017 Mark Webb-Johnson
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; (C) 2011 Sonny Chen @ EPRO/DX
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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 <string.h>
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#include <cstdarg>
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#include "spi.h"
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spi::spi(const char* name, int misopin, int mosipin, int clkpin)
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: pcp(name)
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{
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m_mtx = xSemaphoreCreateMutex();
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//CSW memset(&m_buscfg, 0, sizeof(spi_nodma_bus_config_t));
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memset(&m_buscfg, 0, sizeof(spi_bus_config_t));
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m_buscfg.miso_io_num=misopin;
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m_buscfg.mosi_io_num=mosipin;
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m_buscfg.sclk_io_num=clkpin;
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m_buscfg.quadwp_io_num=-1;
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m_buscfg.quadhd_io_num=-1;
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m_host = SPI_HOST; // CSW not yet assgined
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m_initialized = false;
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}
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spi::~spi()
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{
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}
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bool spi::LockBus(TickType_t delay)
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{
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return (xSemaphoreTake(m_mtx, delay) == pdTRUE);
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}
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void spi::UnlockBus()
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{
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xSemaphoreGive(m_mtx);
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}
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//CSW uint8_t* spi::spi_cmd(spi_nodma_device_handle_t spi, uint8_t* buf, int rxlen, int txlen, ...)
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uint8_t* spi::spi_cmd(spi_device_handle_t spi, uint8_t* buf, int rxlen, int txlen, ...)
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{
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va_list args;
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esp_err_t ret;
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memset(buf,0,rxlen+txlen);
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va_start(args, txlen);
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for (int k=0; k<txlen; k++)
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{
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buf[k] = va_arg(args,int);
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}
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va_end(args);
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//CSW spi_nodma_transaction_t t;
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spi_transaction_t t;
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memset(&t, 0, sizeof(t)); //Zero out the transaction
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t.length=(txlen+rxlen)*8; // Transmit length (in bits)
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// We are using spi_master_no_dma in full-duplex mode (even if below we return only the part received after transmitted bytes == half-duplex),
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// so here we configure the library to copy all the data SPI registers during transaction (full-duplex)
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t.rxlength=(txlen+rxlen)*8; // Receive length (in bits)
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t.tx_buffer=buf; // Buffer to send
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t.rx_buffer=buf; // Buffer to receive
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t.user=(void*)0; // D/C needs to be set to 0
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if (LockBus(portMAX_DELAY))
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{
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// Asserting and releasing the CS pin is now part of the SPI module, using callbacks if needed
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//CSW if (spi->cfg.spics_io_num == -1) {// use software CS
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//CSW spi_nodma_device_select(spi,0);
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//CSW }
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//CSW ret=spi_nodma_device_transmit(spi, &t, portMAX_DELAY); // Transmit!
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ret=spi_device_polling_transmit(spi, &t); // Transmit!
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//CSW if (spi->cfg.spics_io_num == -1) { // use software CS
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//CSW spi_nodma_device_deselect(spi);
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//CSW }
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assert(ret==ESP_OK); // Should have had no issues.
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UnlockBus();
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}
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return buf + txlen; // return only the data received after tx (half-duplex)
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}
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/************************************
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* Completely removed as superflous
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esp_err_t spi::spi_deselect(spi_nodma_device_handle_t spi)
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{
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esp_err_t ret = ESP_OK;
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if (LockBus(portMAX_DELAY))
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{
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ret = spi_nodma_device_deselect(spi);
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UnlockBus();
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}
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return ret;
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}
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****************************/
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