mirror of https://github.com/arendst/Tasmota.git
94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
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/*
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* File: spi.cpp
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* Author:
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*
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* Created on
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*
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* Inspired from spi speed test from wiringPi
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* wiringPi/examples/spiSpeed.c
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*/
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#include "spi.h"
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#include <wiringPi.h>
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#include <wiringPiSPI.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#define RF24_SPI_SPEED 8 * 1000000 // 8Mhz
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#define RF24_SPI_CHANNEL 0
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SPI::SPI():fd(-1)
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{
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printf("wiringPi RF24 DRIVER\n");
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}
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void SPI::begin(int csn_pin)
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{
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// initialize the wiringPiSPI
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if ((this->fd = wiringPiSPISetup(RF24_SPI_CHANNEL, RF24_SPI_SPEED)) < 0)
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{
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printf("Cannot configure the SPI device!\n");
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fflush(stdout);
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abort();
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}
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else
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printf("Configured SPI fd: %d - pin: %d\n", fd, csn_pin);
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}
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uint8_t SPI::transfer(uint8_t tx)
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{
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memset(&msgByte, 0, sizeof(msgByte));
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memcpy(&msgByte, &tx, sizeof(tx));
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if(wiringPiSPIDataRW(RF24_SPI_CHANNEL, &msgByte, sizeof(tx)) < 0)
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{
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printf("transfer(): Cannot send data: %s\n", strerror(errno));
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fflush(stdout);
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abort();
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}
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return msgByte;
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}
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void SPI::transfern(char* buf, uint32_t len)
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{
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printf("transfern(tx: %s)\n", buf);
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if(wiringPiSPIDataRW(RF24_SPI_CHANNEL, (uint8_t *)buf, len) < 0)
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{
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printf("transfern(): Cannot send data %s\n", strerror(errno));
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fflush(stdout);
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abort();
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}
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}
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void SPI::transfernb(char* tbuf, char* rbuf, uint32_t len)
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{
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// using an auxiliary buffer to keep tx and rx different
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memset(msg, 0, sizeof(msg));
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memcpy(msg, tbuf, len);
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if(wiringPiSPIDataRW(RF24_SPI_CHANNEL, msg, len) < 0)
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{
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printf("transfernb() Cannot send data %s\n", strerror(errno));
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fflush(stdout);
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abort();
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}
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memcpy(rbuf, msg, len);
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}
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SPI::~SPI()
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{
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if (!(this->fd < 0))
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{
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close(this->fd);
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this->fd = -1;
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}
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}
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