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https://github.com/RIOT-OS/RIOT.git
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a471f3583e
The device ID returned on WLR089 is 0x13 instead of 0x12, but it appears to work just like sx1276. Also check for the other device ID to make the driver work on this module.
241 lines
7.5 KiB
C
241 lines
7.5 KiB
C
/*
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* Copyright (c) 2016 Unwired Devices <info@unwds.com>
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* 2017 Inria Chile
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* 2017 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_sx127x
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* @{
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* @file
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* @brief implementation of internal functions for sx127x
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*
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* @author Eugene P. <ep@unwds.com>
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* @author José Ignacio Alamos <jose.alamos@inria.cl>
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* @author Alexandre Abadie <alexandre.abadie@inria.fr>
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* @}
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*/
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include "ztimer.h"
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#include "net/lora.h"
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#include "sx127x.h"
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#include "sx127x_registers.h"
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#include "sx127x_internal.h"
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#include "sx127x_params.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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#define SX127X_SPI_SPEED (SPI_CLK_1MHZ)
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#define SX127X_SPI_MODE (SPI_MODE_0)
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int sx127x_check_version(const sx127x_t *dev)
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{
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/* Read version number and compare with sx127x assigned revision */
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uint8_t version = sx127x_reg_read(dev, SX127X_REG_VERSION);
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#if defined(MODULE_SX1272)
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if (version != VERSION_SX1272) {
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DEBUG("[sx127x] sx1272 test failed, invalid version number: %d\n",
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version);
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return -1;
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}
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DEBUG("[sx127x] SX1272 transceiver detected\n");
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#else /* MODULE_SX1276) */
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if (version != VERSION_SX1276 && version != VERSION_SX1276_WLR089) {
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DEBUG("[sx127x] sx1276 test failed, invalid version number: %d\n",
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version);
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return -1;
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}
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DEBUG("[sx127x] SX1276 transceiver detected\n");
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#endif
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return 0;
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}
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void sx127x_reg_write(const sx127x_t *dev, uint8_t addr, uint8_t data)
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{
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sx127x_reg_write_burst(dev, addr, &data, 1);
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}
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uint8_t sx127x_reg_read(const sx127x_t *dev, uint8_t addr)
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{
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uint8_t data;
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sx127x_reg_read_burst(dev, addr, &data, 1);
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return data;
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}
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void sx127x_reg_write_burst(const sx127x_t *dev, uint8_t addr, uint8_t *buffer,
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uint8_t size)
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{
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spi_acquire(dev->params.spi, SPI_CS_UNDEF, SX127X_SPI_MODE, SX127X_SPI_SPEED);
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gpio_clear(dev->params.nss_pin);
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spi_transfer_regs(dev->params.spi, SPI_CS_UNDEF, addr | 0x80, (char *)buffer, NULL, size);
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gpio_set(dev->params.nss_pin);
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spi_release(dev->params.spi);
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}
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void sx127x_reg_read_burst(const sx127x_t *dev, uint8_t addr, uint8_t *buffer,
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uint8_t size)
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{
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spi_acquire(dev->params.spi, SPI_CS_UNDEF, SX127X_SPI_MODE, SX127X_SPI_SPEED);
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gpio_clear(dev->params.nss_pin);
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spi_transfer_regs(dev->params.spi, SPI_CS_UNDEF, addr & 0x7F, NULL, (char *)buffer, size);
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gpio_set(dev->params.nss_pin);
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spi_release(dev->params.spi);
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}
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void sx127x_write_fifo(const sx127x_t *dev, uint8_t *buffer, uint8_t size)
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{
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sx127x_reg_write_burst(dev, 0, buffer, size);
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}
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void sx127x_read_fifo(const sx127x_t *dev, uint8_t *buffer, uint8_t size)
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{
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sx127x_reg_read_burst(dev, 0, buffer, size);
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}
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#if defined(MODULE_SX1276)
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void sx1276_rx_chain_calibration(sx127x_t *dev)
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{
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uint8_t reg_pa_config_init_val;
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uint32_t initial_freq;
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/* Save context */
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reg_pa_config_init_val = sx127x_reg_read(dev, SX127X_REG_PACONFIG);
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initial_freq = (double)(((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMSB) << 16)
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| ((uint32_t)sx127x_reg_read(dev, SX127X_REG_FRFMID) << 8)
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| ((uint32_t)sx127x_reg_read(dev,
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SX127X_REG_FRFLSB))) *
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(double)LORA_FREQUENCY_RESOLUTION_DEFAULT;
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/* Cut the PA just in case, RFO output, power = -1 dBm */
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sx127x_reg_write(dev, SX127X_REG_PACONFIG, 0x00);
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/* Launch Rx chain calibration for LF band */
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sx127x_reg_write(dev,
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SX127X_REG_IMAGECAL,
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(sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_MASK)
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| SX127X_RF_IMAGECAL_IMAGECAL_START);
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while ((sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_RUNNING)
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== SX127X_RF_IMAGECAL_IMAGECAL_RUNNING) {}
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/* Set a frequency in HF band */
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sx127x_set_channel(dev, SX127X_HF_CHANNEL_DEFAULT);
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/* Launch Rx chain calibration for HF band */
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sx127x_reg_write(dev,
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SX127X_REG_IMAGECAL,
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(sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_MASK)
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| SX127X_RF_IMAGECAL_IMAGECAL_START);
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while ((sx127x_reg_read(dev, SX127X_REG_IMAGECAL) & SX127X_RF_IMAGECAL_IMAGECAL_RUNNING)
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== SX127X_RF_IMAGECAL_IMAGECAL_RUNNING) {}
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/* Restore context */
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sx127x_reg_write(dev, SX127X_REG_PACONFIG, reg_pa_config_init_val);
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sx127x_set_channel(dev, initial_freq);
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}
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#endif
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int16_t sx127x_read_rssi(const sx127x_t *dev)
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{
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int16_t rssi = 0;
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switch (dev->settings.modem) {
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case SX127X_MODEM_FSK:
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rssi = -(sx127x_reg_read(dev, SX127X_REG_RSSIVALUE) >> 1);
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break;
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case SX127X_MODEM_LORA:
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#if defined(MODULE_SX1272)
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rssi = SX127X_RSSI_OFFSET + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
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#else /* MODULE_SX1276 */
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if (dev->settings.channel > SX127X_RF_MID_BAND_THRESH) {
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rssi = SX127X_RSSI_OFFSET_HF + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
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}
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else {
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rssi = SX127X_RSSI_OFFSET_LF + sx127x_reg_read(dev, SX127X_REG_LR_RSSIVALUE);
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}
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#endif
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break;
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default:
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rssi = -1;
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break;
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}
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return rssi;
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}
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void sx127x_start_cad(sx127x_t *dev)
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{
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switch (dev->settings.modem) {
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case SX127X_MODEM_FSK:
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break;
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case SX127X_MODEM_LORA:
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/* Disable all interrupts except CAD-related */
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sx127x_reg_write(dev, SX127X_REG_LR_IRQFLAGSMASK,
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SX127X_RF_LORA_IRQFLAGS_RXTIMEOUT |
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SX127X_RF_LORA_IRQFLAGS_RXDONE |
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SX127X_RF_LORA_IRQFLAGS_PAYLOADCRCERROR |
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SX127X_RF_LORA_IRQFLAGS_VALIDHEADER |
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SX127X_RF_LORA_IRQFLAGS_TXDONE |
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/*SX127X_RF_LORA_IRQFLAGS_CADDONE |*/
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SX127X_RF_LORA_IRQFLAGS_FHSSCHANGEDCHANNEL
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/* | SX127X_RF_LORA_IRQFLAGS_CADDETECTED*/
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);
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if (gpio_is_valid(dev->params.dio3_pin)) {
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/* DIO3 = CADDone */
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sx127x_reg_write(dev, SX127X_REG_DIOMAPPING1,
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(sx127x_reg_read(dev, SX127X_REG_DIOMAPPING1) &
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SX127X_RF_LORA_DIOMAPPING1_DIO3_MASK) |
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SX127X_RF_LORA_DIOMAPPING1_DIO3_00);
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}
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else {
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/* DIO0 = CADDone */
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sx127x_reg_write(dev, SX127X_REG_DIOMAPPING1,
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(sx127x_reg_read(dev, SX127X_REG_DIOMAPPING1) &
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SX127X_RF_LORA_DIOMAPPING1_DIO0_MASK) |
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SX127X_RF_LORA_DIOMAPPING1_DIO0_10);
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}
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sx127x_set_state(dev, SX127X_RF_CAD);
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sx127x_set_op_mode(dev, SX127X_RF_LORA_OPMODE_CAD);
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break;
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default:
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break;
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}
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}
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bool sx127x_is_channel_free(sx127x_t *dev, uint32_t freq, int16_t rssi_threshold)
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{
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int16_t rssi = 0;
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sx127x_set_channel(dev, freq);
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sx127x_set_op_mode(dev, SX127X_RF_OPMODE_RECEIVER);
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ztimer_sleep(ZTIMER_MSEC, 1); /* wait 1 millisecond */
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rssi = sx127x_read_rssi(dev);
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sx127x_set_sleep(dev);
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return (rssi <= rssi_threshold);
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}
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