a752c7ab
 elopes
add first test an...
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/*
* Copyright (c) 2016 Unwired Devices <info@unwds.com>
* 2017 Inria Chile
* 2017 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_sx127x
* @{
* @file
* @brief implementation of internal functions for sx127x
*
* @author Eugene P. <ep@unwds.com>
* @author José Ignacio Alamos <jose.alamos@inria.cl>
* @author Alexandre Abadie <alexandre.abadie@inria.fr>
* @}
*/
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <inttypes.h>
#include "irq.h"
#include "sx127x.h"
#include "sx127x_registers.h"
#include "sx127x_internal.h"
#include "sx127x_params.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define SX127X_SPI_SPEED (SPI_CLK_1MHZ)
#define SX127X_SPI_MODE (SPI_MODE_0)
bool sx127x_test(const sx127x_t *dev)
{
/* Read version number and compare with sx127x assigned revision */
uint8_t version = sx127x_reg_read(dev, SX127X_REG_VERSION);
#if defined(MODULE_SX1272)
if (version != VERSION_SX1272) {
DEBUG("[Error] sx1272 test failed, invalid version number: %d\n",
version);
return false;
}
DEBUG("SX1272 transceiver detected.\n");
#else /* MODULE_SX1276) */
if (version != VERSION_SX1276) {
DEBUG("[Error] sx1276 test failed, invalid version number: %d\n",
version);
return false;
}
DEBUG("SX1276 transceiver detected.\n");
#endif
return true;
}
void sx127x_reg_write(const sx127x_t *dev, uint8_t addr, uint8_t data)
{
sx127x_reg_write_burst(dev, addr, &data, 1);
}
uint8_t sx127x_reg_read(const sx127x_t *dev, uint8_t addr)
{
uint8_t data;
sx127x_reg_read_burst(dev, addr, &data, 1);
return data;
}
void sx127x_reg_write_burst(const sx127x_t *dev, uint8_t addr, uint8_t *buffer,
uint8_t size)
{
unsigned int cpsr;
spi_acquire(dev->params.spi, SPI_CS_UNDEF, SX127X_SPI_MODE, SX127X_SPI_SPEED);
cpsr = irq_disable();
gpio_clear(dev->params.nss_pin);
spi_transfer_regs(dev->params.spi, SPI_CS_UNDEF, addr | 0x80, (char *) buffer, NULL, size);
gpio_set(dev->params.nss_pin);
irq_restore(cpsr);
spi_release(dev->params.spi);
}
void sx127x_reg_read_burst(const sx127x_t *dev, uint8_t addr, uint8_t *buffer,
uint8_t size)
{
unsigned int cpsr;
cpsr = irq_disable();
spi_acquire(dev->params.spi, SPI_CS_UNDEF, SX127X_SPI_MODE, SX127X_SPI_SPEED);
gpio_clear(dev->params.nss_pin);
spi_transfer_regs(dev->params.spi, SPI_CS_UNDEF, addr & 0x7F, NULL, (char *) buffer, size);
gpio_set(dev->params.nss_pin);
spi_release(dev->params.spi);
irq_restore(cpsr);
}
void sx127x_write_fifo(const sx127x_t *dev, uint8_t *buffer, uint8_t size)
{
sx127x_reg_write_burst(dev, 0, buffer, size);
}
void sx127x_read_fifo(const sx127x_t *dev, uint8_t *buffer, uint8_t size)
{
sx127x_reg_read_burst(dev, 0, buffer, size);
}
void sx127x_rx_chain_calibration(sx127x_t *dev)
{
uint8_t reg_pa_config_init_val;
uint32_t initial_freq;
/* Save context */
reg_pa_config_init_val = sx127x_reg_read(dev, SX127X_REG_PACONFIG);
initial_freq = (double) (((uint32_t) sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16)
| ((uint32_t) sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8)
| ((uint32_t) sx127x_reg_read(dev, SX127X_REG_FRFLSB))) * (double) SX127X_FREQUENCY_RESOLUTION;
/* Cut the PA just in case, RFO output, power = -1 dBm */
sx127x_reg_write(dev, SX127X_REG_PACONFIG, 0x00);
/* Launch Rx chain calibration for LF band */
sx127x_reg_write(dev,
SX127X_REG_IMAGECAL,
(sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_MASK)
| SX127X_RF_IMAGECAL_IMAGECAL_START);
while ((sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_RUNNING)
== SX127X_RF_IMAGECAL_IMAGECAL_RUNNING) {
}
/* Set a frequency in HF band */
sx127x_set_channel(dev, SX127X_HF_CHANNEL_DEFAULT);
/* Launch Rx chain calibration for HF band */
sx127x_reg_write(dev,
SX127X_REG_IMAGECAL,
(sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_MASK)
| SX127X_RF_IMAGECAL_IMAGECAL_START);
while ((sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_RUNNING)
== SX127X_RF_IMAGECAL_IMAGECAL_RUNNING) {
}
/* Restore context */
sx127x_reg_write(dev, SX127X_REG_PACONFIG, reg_pa_config_init_val);
sx127x_set_channel(dev, initial_freq);
}
int16_t sx127x_read_rssi(const sx127x_t *dev)
{
int16_t rssi = 0;
switch (dev->settings.modem) {
case SX127X_MODEM_FSK:
rssi = -(sx127x_reg_read(dev, SX127X_REG_RSSIVALUE) >> 1);
break;
case SX127X_MODEM_LORA:
#if defined(MODULE_SX1272)
rssi = SX127X_RSSI_OFFSET + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
#else /* MODULE_SX1276 */
if (dev->settings.channel > SX127X_RF_MID_BAND_THRESH) {
rssi = SX127X_RSSI_OFFSET_HF + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
}
else {
rssi = SX127X_RSSI_OFFSET_LF + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
}
#endif
break;
default:
rssi = -1;
break;
}
return rssi;
}
void sx127x_start_cad(sx127x_t *dev)
{
switch (dev->settings.modem) {
case SX127X_MODEM_FSK:
break;
case SX127X_MODEM_LORA:
/* Disable all interrupts except CAD-related */
sx127x_reg_write(dev, SX127X_REG_LR_IRQFLAGSMASK,
SX127X_RF_LORA_IRQFLAGS_RXTIMEOUT |
SX127X_RF_LORA_IRQFLAGS_RXDONE |
SX127X_RF_LORA_IRQFLAGS_PAYLOADCRCERROR |
SX127X_RF_LORA_IRQFLAGS_VALIDHEADER |
SX127X_RF_LORA_IRQFLAGS_TXDONE |
/*SX127X_RF_LORA_IRQFLAGS_CADDONE |*/
SX127X_RF_LORA_IRQFLAGS_FHSSCHANGEDCHANNEL
/* | SX127X_RF_LORA_IRQFLAGS_CADDETECTED*/
);
/* DIO3 = CADDone */
sx127x_reg_write(dev, SX127X_REG_DIOMAPPING1,
(sx127x_reg_read(dev, SX127X_REG_DIOMAPPING1) &
SX127X_RF_LORA_DIOMAPPING1_DIO3_MASK) |
SX127X_RF_LORA_DIOMAPPING1_DIO3_00);
sx127x_set_state(dev, SX127X_RF_CAD);
sx127x_set_op_mode(dev, SX127X_RF_LORA_OPMODE_CAD);
break;
default:
break;
}
}
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