cc2420_internal.c
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/*
* Copyright (C) 2015-2016 Freie Universität Berlin
* 2016 Inria
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup drivers_cc2420
* @{
*
* @file
* @brief Implementation of driver internal functions
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Francisco Acosta <francisco.acosta@inria.fr>
*
* @}
*/
#include "periph/spi.h"
#include "periph/gpio.h"
#include "xtimer.h"
#include "cc2420_internal.h"
#include "cc2420_registers.h"
uint8_t cc2420_strobe(const cc2420_t *dev, const uint8_t command)
{
char res;
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_byte(dev->params.spi, (char)command, (char *)&res);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
return res;
}
void cc2420_reg_write(const cc2420_t *dev,
const uint8_t addr,
const uint16_t value)
{
uint16_t tmp = byteorder_htons(value).u16;
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_regs(dev->params.spi, CC2420_REG_WRITE | addr,
(char *)&tmp, NULL, 2);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
}
uint16_t cc2420_reg_read(const cc2420_t *dev, const uint8_t addr)
{
network_uint16_t tmp;
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_regs(dev->params.spi, CC2420_REG_READ | addr,
NULL, (char *)&tmp, 2);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
return byteorder_ntohs(tmp);
}
void cc2420_ram_read(const cc2420_t *dev, const uint16_t addr,
uint8_t *data, const size_t len)
{
char tmp[] = { (CC2420_RAM | (addr & 0x7f)),
(CC2420_RAM_READ | ((addr >> 1) & 0xc0)) };
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_bytes(dev->params.spi, tmp, NULL, 2);
spi_transfer_bytes(dev->params.spi, NULL, (char*)data, len);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
}
void cc2420_ram_write(const cc2420_t *dev, const uint16_t addr,
const uint8_t *data, const size_t len)
{
char tmp[] = { (CC2420_RAM | (addr & 0x7f)),
(CC2420_RAM_WRITE | ((addr >> 1) & 0xc0)) };
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_bytes(dev->params.spi, tmp, NULL, 2);
spi_transfer_bytes(dev->params.spi, (char*)data, NULL, len);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
}
void cc2420_fifo_read(const cc2420_t *dev, uint8_t *data, const size_t len)
{
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_regs(dev->params.spi, CC2420_FIFO_READ,
NULL, (char *)data, len);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
}
void cc2420_fifo_write(const cc2420_t *dev, uint8_t *data, const size_t len)
{
spi_acquire(dev->params.spi);
gpio_clear(dev->params.pin_cs);
spi_transfer_regs(dev->params.spi, CC2420_FIFO_WRITE,
(char *)data, NULL, len);
gpio_set(dev->params.pin_cs);
spi_release(dev->params.spi);
}
uint8_t cc2420_status(cc2420_t *dev)
{
return cc2420_strobe(dev, CC2420_STROBE_NOP);
}
uint8_t cc2420_state(cc2420_t *dev)
{
return (uint8_t)cc2420_reg_read(dev, CC2420_REG_FSMSTATE);
}
void cc2420_en_xosc(cc2420_t *dev)
{
cc2420_strobe(dev, CC2420_STROBE_XOSCON);
xtimer_usleep(CC2420_XOSCON_DELAY);
}