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This commit is contained in:
Erik Tylek Kettenburg
2015-06-23 12:42:35 -07:00
parent bc55c9bb45
commit 6ca6b114d5
3581 changed files with 93 additions and 51 deletions
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132
digistump-sam/libraries/RF24/librf24-rpi/librf24/spi.cpp Normal file
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/*
* File: spi.cpp
* Author: Purinda Gunasekara <purinda@gmail.com>
*
* Created on 24 June 2012, 11:00 AM
*
* Inspired from spidev test in linux kernel documentation
* www.kernel.org/doc/Documentation/spi/spidev_test.c
*/
#include "spi.h"
SPI::SPI() {
// this->device = "/dev/spidev0.0";;
this->bits = 8;
// this->speed = 24000000; // 24Mhz - proly doesnt work
// this->speed = 16000000; // 16Mhz
// this->speed = 8000000; // 8Mhz
this->speed = 2000000; // 2Mhz
this->mode = 0;
// this->init();
}
void SPI::setbits( uint8_t bits )
{
this->bits = bits;
}
void SPI::setspeed( uint32_t speed )
{
this->speed = speed;
}
void SPI::setdevice( string devicefile )
{
this->device = devicefile;
}
void SPI::init()
{
int ret;
this->fd = open(this->device.c_str(), O_RDWR);
if (this->fd < 0)
{
perror("can't open device");
abort();
}
/*
* spi mode
*/
ret = ioctl(this->fd, SPI_IOC_WR_MODE, &this->mode);
if (ret == -1)
{
perror("can't set spi mode");
abort();
}
ret = ioctl(this->fd, SPI_IOC_RD_MODE, &this->mode);
if (ret == -1)
{
perror("can't set spi mode");
abort();
}
/*
* bits per word
*/
ret = ioctl(this->fd, SPI_IOC_WR_BITS_PER_WORD, &this->bits);
if (ret == -1)
{
perror("can't set bits per word");
abort();
}
ret = ioctl(this->fd, SPI_IOC_RD_BITS_PER_WORD, &this->bits);
if (ret == -1)
{
perror("can't set bits per word");
abort();
}
/*
* max speed hz
*/
ret = ioctl(this->fd, SPI_IOC_WR_MAX_SPEED_HZ, &this->speed);
if (ret == -1)
{
perror("can't set max speed hz");
abort();
}
ret = ioctl(this->fd, SPI_IOC_RD_MAX_SPEED_HZ, &this->speed);
if (ret == -1)
{
perror("can't set max speed hz");
abort();
}
}
uint8_t SPI::transfer(uint8_t tx_)
{
int ret;
// One byte is transfered at once
uint8_t tx[] = {0};
tx[0] = tx_;
uint8_t rx[ARRAY_SIZE(tx)] = {0};
struct spi_ioc_transfer tr;
tr.tx_buf = (unsigned long)tx;
tr.rx_buf = (unsigned long)rx;
tr.len = ARRAY_SIZE(tx);
tr.delay_usecs = 0;
// tr.cs_change = 1;
tr.speed_hz = this->speed;
tr.bits_per_word = this->bits;
ret = ioctl(this->fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
{
perror("can't send spi message");
abort();
}
return rx[0];
}
SPI::~SPI() {
close(this->fd);
}