OVMS3/OVMS.V3/components/spi/spi.cpp

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