kw2xrf_spi.c
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/*
* Copyright (C) 2015 PHYTEC Messtechnik GmbH
*
* 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_kw2xrf
* @{
* @file
* @brief Implementation of SPI-functions for the kw2xrf driver
*
* @author Johann Fischer <j.fischer@phytec.de>
* @author Jonas Remmert <j.remmert@phytec.de>
* @}
*/
#include "kw2xrf.h"
#include "kw2xrf_reg.h"
#include "kw2xrf_spi.h"
#include "periph/spi.h"
#include "periph/gpio.h"
#include "cpu_conf.h"
#include "irq.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define KW2XRF_IBUF_LENGTH 9
static uint8_t ibuf[KW2XRF_IBUF_LENGTH];
/** Set up in kw2xrf_spi_init during initialization */
static gpio_t kw2xrf_cs_pin;
static spi_t kw2xrf_spi;
void kw2xrf_spi_transfer_head(void)
{
#if KW2XRF_SHARED_SPI
spi_acquire(kw2xrf_spi);
gpio_clear(kw2xrf_cs_pin);
#endif
}
void kw2xrf_spi_transfer_tail(void)
{
#if KW2XRF_SHARED_SPI
gpio_set(kw2xrf_cs_pin);
spi_release(kw2xrf_spi);
#endif
}
int kw2xrf_spi_init(spi_t spi, spi_speed_t spi_speed,
gpio_t cs_pin)
{
int res;
kw2xrf_cs_pin = cs_pin; /**< for later reference */
kw2xrf_spi = spi;
#if KW2XRF_SHARED_SPI
spi_acquire(kw2xrf_spi);
#endif
res = spi_init_master(kw2xrf_spi, SPI_CONF_FIRST_RISING, spi_speed);
#if KW2XRF_SHARED_SPI
spi_release(kw2xrf_spi);
gpio_init(kw2xrf_cs_pin, GPIO_OUT);
gpio_set(kw2xrf_cs_pin);
#endif
if (res < 0) {
DEBUG("kw2xrf_spi_init: error initializing SPI_%i device (code %i)\n",
kw2xrf_spi, res);
return -1;
}
return 0;
}
void kw2xrf_write_dreg(uint8_t addr, uint8_t value)
{
kw2xrf_spi_transfer_head();
spi_transfer_reg(kw2xrf_spi, addr, value, NULL);
kw2xrf_spi_transfer_tail();
return;
}
uint8_t kw2xrf_read_dreg(uint8_t addr)
{
uint8_t value;
kw2xrf_spi_transfer_head();
spi_transfer_reg(kw2xrf_spi, (addr | MKW2XDRF_REG_READ),
0x0, (char *)&value);
kw2xrf_spi_transfer_tail();
return value;
}
void kw2xrf_write_iregs(uint8_t addr, uint8_t *buf, uint8_t length)
{
if (length > (KW2XRF_IBUF_LENGTH - 1)) {
length = KW2XRF_IBUF_LENGTH - 1;
}
ibuf[0] = addr;
for (uint8_t i = 0; i < length; i++) {
ibuf[i + 1] = buf[i];
}
kw2xrf_spi_transfer_head();
spi_transfer_regs(kw2xrf_spi, MKW2XDM_IAR_INDEX,
(char *)ibuf, NULL, length + 1);
kw2xrf_spi_transfer_tail();
return;
}
void kw2xrf_read_iregs(uint8_t addr, uint8_t *buf, uint8_t length)
{
if (length > (KW2XRF_IBUF_LENGTH - 1)) {
length = KW2XRF_IBUF_LENGTH - 1;
}
ibuf[0] = addr;
kw2xrf_spi_transfer_head();
spi_transfer_regs(kw2xrf_spi, MKW2XDM_IAR_INDEX | MKW2XDRF_REG_READ,
(char *)ibuf, (char *)ibuf, length + 1);
kw2xrf_spi_transfer_tail();
for (uint8_t i = 0; i < length; i++) {
buf[i] = ibuf[i + 1];
}
return;
}
void kw2xrf_write_fifo(uint8_t *data, uint8_t length)
{
kw2xrf_spi_transfer_head();
spi_transfer_regs(kw2xrf_spi, MKW2XDRF_BUF_WRITE,
(char *)data, NULL, length);
kw2xrf_spi_transfer_tail();
}
void kw2xrf_read_fifo(uint8_t *data, uint8_t length)
{
kw2xrf_spi_transfer_head();
spi_transfer_regs(kw2xrf_spi, MKW2XDRF_BUF_READ, NULL,
(char *)data, length);
kw2xrf_spi_transfer_tail();
}
/** @} */