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Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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zephyr/drivers/lora/sx127x.c

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/*
* Copyright (c) 2019 Manivannan Sadhasivam
* Copyright (c) 2020 Grinn
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/lora.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/kernel.h>
#include "sx12xx_common.h"
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(sx127x, CONFIG_LORA_LOG_LEVEL);
#if DT_HAS_COMPAT_STATUS_OKAY(semtech_sx1272)
#include <sx1272/sx1272.h>
#define DT_DRV_COMPAT semtech_sx1272
#define SX127xCheckRfFrequency SX1272CheckRfFrequency
#define SX127xGetBoardTcxoWakeupTime SX1272GetBoardTcxoWakeupTime
#define SX127xSetAntSwLowPower SX1272SetAntSwLowPower
#define SX127xSetBoardTcxo SX1272SetBoardTcxo
#define SX127xSetAntSw SX1272SetAntSw
#define SX127xReset SX1272Reset
#define SX127xIoIrqInit SX1272IoIrqInit
#define SX127xWriteBuffer SX1272WriteBuffer
#define SX127xReadBuffer SX1272ReadBuffer
#define SX127xSetRfTxPower SX1272SetRfTxPower
#define SX127xGetDio1PinState SX1272GetDio1PinState
#define SX127xInit SX1272Init
#define SX127xGetStatus SX1272GetStatus
#define SX127xSetModem SX1272SetModem
#define SX127xSetChannel SX1272SetChannel
#define SX127xIsChannelFree SX1272IsChannelFree
#define SX127xRandom SX1272Random
#define SX127xSetRxConfig SX1272SetRxConfig
#define SX127xSetTxConfig SX1272SetTxConfig
#define SX127xGetTimeOnAir SX1272GetTimeOnAir
#define SX127xSend SX1272Send
#define SX127xSetSleep SX1272SetSleep
#define SX127xSetStby SX1272SetStby
#define SX127xSetRx SX1272SetRx
#define SX127xWrite SX1272Write
#define SX127xRead SX1272Read
#define SX127xSetMaxPayloadLength SX1272SetMaxPayloadLength
#define SX127xSetPublicNetwork SX1272SetPublicNetwork
#define SX127xGetWakeupTime SX1272GetWakeupTime
#define SX127xSetTxContinuousWave SX1272SetTxContinuousWave
#elif DT_HAS_COMPAT_STATUS_OKAY(semtech_sx1276)
#include <sx1276/sx1276.h>
#define DT_DRV_COMPAT semtech_sx1276
#define SX127xCheckRfFrequency SX1276CheckRfFrequency
#define SX127xGetBoardTcxoWakeupTime SX1276GetBoardTcxoWakeupTime
#define SX127xSetAntSwLowPower SX1276SetAntSwLowPower
#define SX127xSetBoardTcxo SX1276SetBoardTcxo
#define SX127xSetAntSw SX1276SetAntSw
#define SX127xReset SX1276Reset
#define SX127xIoIrqInit SX1276IoIrqInit
#define SX127xWriteBuffer SX1276WriteBuffer
#define SX127xReadBuffer SX1276ReadBuffer
#define SX127xSetRfTxPower SX1276SetRfTxPower
#define SX127xGetDio1PinState SX1276GetDio1PinState
#define SX127xInit SX1276Init
#define SX127xGetStatus SX1276GetStatus
#define SX127xSetModem SX1276SetModem
#define SX127xSetChannel SX1276SetChannel
#define SX127xIsChannelFree SX1276IsChannelFree
#define SX127xRandom SX1276Random
#define SX127xSetRxConfig SX1276SetRxConfig
#define SX127xSetTxConfig SX1276SetTxConfig
#define SX127xGetTimeOnAir SX1276GetTimeOnAir
#define SX127xSend SX1276Send
#define SX127xSetSleep SX1276SetSleep
#define SX127xSetStby SX1276SetStby
#define SX127xSetRx SX1276SetRx
#define SX127xWrite SX1276Write
#define SX127xRead SX1276Read
#define SX127xSetMaxPayloadLength SX1276SetMaxPayloadLength
#define SX127xSetPublicNetwork SX1276SetPublicNetwork
#define SX127xGetWakeupTime SX1276GetWakeupTime
#define SX127xSetTxContinuousWave SX1276SetTxContinuousWave
#else
#error No SX127x instance in device tree.
#endif
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(semtech_sx1272) +
DT_NUM_INST_STATUS_OKAY(semtech_sx1276) <= 1,
"Multiple SX127x instances in DT");
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_startup_delay_ms)
#define TCXO_POWER_STARTUP_DELAY_MS \
DT_INST_PROP(0, tcxo_power_startup_delay_ms)
#else
#define TCXO_POWER_STARTUP_DELAY_MS 0
#endif
/*
* Those macros must be in sync with 'power-amplifier-output' dts property.
*/
#define SX127X_PA_RFO 0
#define SX127X_PA_BOOST 1
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios) && \
DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
#define SX127X_PA_OUTPUT(power) \
((power) > 14 ? SX127X_PA_BOOST : SX127X_PA_RFO)
#elif DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios)
#define SX127X_PA_OUTPUT(power) SX127X_PA_RFO
#elif DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
#define SX127X_PA_OUTPUT(power) SX127X_PA_BOOST
#elif DT_INST_NODE_HAS_PROP(0, power_amplifier_output)
#define SX127X_PA_OUTPUT(power) \
DT_INST_ENUM_IDX(0, power_amplifier_output)
#else
BUILD_ASSERT(0, "None of rfo-enable-gpios, pa-boost-enable-gpios and "
"power-amplifier-output has been specified. "
"Look at semtech,sx127x-base.yaml to fix that.");
#endif
#define SX127X_PADAC_20DBM_ON (RF_PADAC_20DBM_ON)
#define SX127X_PADAC_20DBM_OFF (RF_PADAC_20DBM_OFF)
#define SX127X_PADAC_20DBM_MASK (~RF_PADAC_20DBM_MASK)
#define SX127X_PACONFIG_PASELECT_PABOOST (RF_PACONFIG_PASELECT_PABOOST)
#define SX127X_PACONFIG_OUTPUTPOWER_MASK (~RF_PACONFIG_OUTPUTPOWER_MASK)
#ifdef RF_PACONFIG_MAX_POWER_MASK
#define SX127X_PACONFIG_MAX_POWER_SHIFT 4
#endif
extern DioIrqHandler *DioIrq[];
/* Helper macro that UTIL_LISTIFY can use and produces an element with comma */
#define SX127X_DIO_GPIO_LEN(inst) \
DT_INST_PROP_LEN(inst, dio_gpios)
#define SX127X_DIO_GPIO_ELEM(idx, inst) \
GPIO_DT_SPEC_INST_GET_BY_IDX(inst, dio_gpios, idx)
#define SX127X_DIO_GPIO_INIT(n) \
LISTIFY(SX127X_DIO_GPIO_LEN(n), SX127X_DIO_GPIO_ELEM, (,), n)
static const struct gpio_dt_spec sx127x_dios[] = { SX127X_DIO_GPIO_INIT(0) };
#define SX127X_MAX_DIO ARRAY_SIZE(sx127x_dios)
struct sx127x_config {
struct spi_dt_spec bus;
struct gpio_dt_spec reset;
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
struct gpio_dt_spec antenna_enable;
#endif
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
struct gpio_dt_spec rfi_enable;
#endif
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios)
struct gpio_dt_spec rfo_enable;
#endif
#if DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
struct gpio_dt_spec pa_boost_enable;
#endif
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
struct gpio_dt_spec tcxo_power;
#endif
};
static const struct sx127x_config dev_config = {
.bus = SPI_DT_SPEC_INST_GET(0, SPI_WORD_SET(8) | SPI_TRANSFER_MSB, 0),
.reset = GPIO_DT_SPEC_INST_GET(0, reset_gpios),
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
.antenna_enable = GPIO_DT_SPEC_INST_GET(0, antenna_enable_gpios),
#endif
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
.rfi_enable = GPIO_DT_SPEC_INST_GET(0, rfi_enable_gpios),
#endif
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios)
.rfo_enable = GPIO_DT_SPEC_INST_GET(0, rfo_enable_gpios),
#endif
#if DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
.pa_boost_enable = GPIO_DT_SPEC_INST_GET(0, pa_boost_enable_gpios),
#endif
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
.tcxo_power = GPIO_DT_SPEC_INST_GET(0, tcxo_power_gpios),
#endif
};
static struct sx127x_data {
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios) && \
DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
uint8_t tx_power;
#endif
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
bool tcxo_power_enabled;
#endif
struct k_work dio_work[SX127X_MAX_DIO];
} dev_data;
static int8_t clamp_int8(int8_t x, int8_t min, int8_t max)
{
if (x < min) {
return min;
} else if (x > max) {
return max;
} else {
return x;
}
}
bool SX127xCheckRfFrequency(uint32_t frequency)
{
/* TODO */
return true;
}
uint32_t SX127xGetBoardTcxoWakeupTime(void)
{
return TCXO_POWER_STARTUP_DELAY_MS;
}
static inline void sx127x_antenna_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
gpio_pin_set_dt(&dev_config.antenna_enable, val);
#endif
}
static inline void sx127x_rfi_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
gpio_pin_set_dt(&dev_config.rfi_enable, val);
#endif
}
static inline void sx127x_rfo_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios)
gpio_pin_set_dt(&dev_config.rfo_enable, val);
#endif
}
static inline void sx127x_pa_boost_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
gpio_pin_set_dt(&dev_config.pa_boost_enable, val);
#endif
}
void SX127xSetAntSwLowPower(bool low_power)
{
if (low_power) {
/* force inactive (low power) state of all antenna paths */
sx127x_rfi_enable(0);
sx127x_rfo_enable(0);
sx127x_pa_boost_enable(0);
sx127x_antenna_enable(0);
} else {
sx127x_antenna_enable(1);
/* rely on SX127xSetAntSw() to configure proper antenna path */
}
}
void SX127xSetBoardTcxo(uint8_t state)
{
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
bool enable = state;
if (enable == dev_data.tcxo_power_enabled) {
return;
}
if (enable) {
gpio_pin_set_dt(&dev_config.tcxo_power, 1);
if (TCXO_POWER_STARTUP_DELAY_MS > 0) {
k_sleep(K_MSEC(TCXO_POWER_STARTUP_DELAY_MS));
}
} else {
gpio_pin_set_dt(&dev_config.tcxo_power, 0);
}
dev_data.tcxo_power_enabled = enable;
#endif
}
void SX127xSetAntSw(uint8_t opMode)
{
switch (opMode) {
case RFLR_OPMODE_TRANSMITTER:
sx127x_rfi_enable(0);
if (SX127X_PA_OUTPUT(dev_data.tx_power) == SX127X_PA_BOOST) {
sx127x_rfo_enable(0);
sx127x_pa_boost_enable(1);
} else {
sx127x_pa_boost_enable(0);
sx127x_rfo_enable(1);
}
break;
default:
sx127x_rfo_enable(0);
sx127x_pa_boost_enable(0);
sx127x_rfi_enable(1);
break;
}
}
void SX127xReset(void)
{
SX127xSetBoardTcxo(true);
gpio_pin_set_dt(&dev_config.reset, 1);
k_sleep(K_MSEC(1));
gpio_pin_set_dt(&dev_config.reset, 0);
k_sleep(K_MSEC(6));
}
static void sx127x_dio_work_handle(struct k_work *work)
{
int dio = work - dev_data.dio_work;
(*DioIrq[dio])(NULL);
}
static void sx127x_irq_callback(const struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
unsigned int i, pin;
pin = find_lsb_set(pins) - 1;
for (i = 0; i < SX127X_MAX_DIO; i++) {
if (dev == sx127x_dios[i].port &&
pin == sx127x_dios[i].pin) {
k_work_submit(&dev_data.dio_work[i]);
}
}
}
void SX127xIoIrqInit(DioIrqHandler **irqHandlers)
{
unsigned int i;
static struct gpio_callback callbacks[SX127X_MAX_DIO];
/* Setup DIO gpios */
for (i = 0; i < SX127X_MAX_DIO; i++) {
if (!irqHandlers[i]) {
continue;
}
if (!gpio_is_ready_dt(&sx127x_dios[i])) {
LOG_ERR("GPIO port %s not ready",
sx127x_dios[i].port->name);
return;
}
k_work_init(&dev_data.dio_work[i], sx127x_dio_work_handle);
gpio_pin_configure_dt(&sx127x_dios[i], GPIO_INPUT);
gpio_init_callback(&callbacks[i],
sx127x_irq_callback,
BIT(sx127x_dios[i].pin));
if (gpio_add_callback(sx127x_dios[i].port, &callbacks[i]) < 0) {
LOG_ERR("Could not set gpio callback.");
return;
}
gpio_pin_interrupt_configure_dt(&sx127x_dios[i],
GPIO_INT_EDGE_TO_ACTIVE);
}
}
static int sx127x_transceive(uint8_t reg, bool write, void *data, size_t length)
{
const struct spi_buf buf[2] = {
{
.buf = &reg,
.len = sizeof(reg)
},
{
.buf = data,
.len = length
}
};
struct spi_buf_set tx = {
.buffers = buf,
.count = ARRAY_SIZE(buf),
};
if (!write) {
const struct spi_buf_set rx = {
.buffers = buf,
.count = ARRAY_SIZE(buf)
};
return spi_transceive_dt(&dev_config.bus, &tx, &rx);
}
return spi_write_dt(&dev_config.bus, &tx);
}
int sx127x_read(uint8_t reg_addr, uint8_t *data, uint8_t len)
{
return sx127x_transceive(reg_addr, false, data, len);
}
int sx127x_write(uint8_t reg_addr, uint8_t *data, uint8_t len)
{
return sx127x_transceive(reg_addr | BIT(7), true, data, len);
}
void SX127xWriteBuffer(uint32_t addr, uint8_t *buffer, uint8_t size)
{
int ret;
ret = sx127x_write(addr, buffer, size);
if (ret < 0) {
LOG_ERR("Unable to write address: 0x%x", addr);
}
}
void SX127xReadBuffer(uint32_t addr, uint8_t *buffer, uint8_t size)
{
int ret;
ret = sx127x_read(addr, buffer, size);
if (ret < 0) {
LOG_ERR("Unable to read address: 0x%x", addr);
}
}
void SX127xSetRfTxPower(int8_t power)
{
int ret;
uint8_t pa_config = 0;
uint8_t pa_dac = 0;
ret = sx127x_read(REG_PADAC, &pa_dac, 1);
if (ret < 0) {
LOG_ERR("Unable to read PA dac");
return;
}
pa_dac &= ~SX127X_PADAC_20DBM_MASK;
if (SX127X_PA_OUTPUT(power) == SX127X_PA_BOOST) {
power = clamp_int8(power, 2, 20);
pa_config |= SX127X_PACONFIG_PASELECT_PABOOST;
if (power > 17) {
pa_dac |= SX127X_PADAC_20DBM_ON;
pa_config |= (power - 5) & SX127X_PACONFIG_OUTPUTPOWER_MASK;
} else {
pa_dac |= SX127X_PADAC_20DBM_OFF;
pa_config |= (power - 2) & SX127X_PACONFIG_OUTPUTPOWER_MASK;
}
} else {
#ifdef SX127X_PACONFIG_MAX_POWER_SHIFT
power = clamp_int8(power, -4, 15);
pa_dac |= SX127X_PADAC_20DBM_OFF;
if (power > 0) {
/* Set the power range to 0 -- 10.8+0.6*7 dBm */
pa_config |= 7 << SX127X_PACONFIG_MAX_POWER_SHIFT;
pa_config |= power & SX127X_PACONFIG_OUTPUTPOWER_MASK;
} else {
/* Set the power range to -4.2 -- 10.8+0.6*0 dBm */
pa_config |= (power + 4) & SX127X_PACONFIG_OUTPUTPOWER_MASK;
}
#else
power = clamp_int8(power, -1, 14);
pa_dac |= SX127X_PADAC_20DBM_OFF;
pa_config |= (power + 1) & SX127X_PACONFIG_OUTPUTPOWER_MASK;
#endif
}
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios) && \
DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
dev_data.tx_power = power;
#endif
ret = sx127x_write(REG_PACONFIG, &pa_config, 1);
if (ret < 0) {
LOG_ERR("Unable to write PA config");
return;
}
ret = sx127x_write(REG_PADAC, &pa_dac, 1);
if (ret < 0) {
LOG_ERR("Unable to write PA dac");
return;
}
}
uint32_t SX127xGetDio1PinState(void)
{
#if SX127X_DIO_GPIO_LEN(0) >= 2
if (gpio_pin_get_dt(&sx127x_dios[1]) > 0) {
return 1U;
}
#endif
return 0U;
}
/* Initialize Radio driver callbacks */
const struct Radio_s Radio = {
.Init = SX127xInit,
.GetStatus = SX127xGetStatus,
.SetModem = SX127xSetModem,
.SetChannel = SX127xSetChannel,
.IsChannelFree = SX127xIsChannelFree,
.Random = SX127xRandom,
.SetRxConfig = SX127xSetRxConfig,
.SetTxConfig = SX127xSetTxConfig,
.CheckRfFrequency = SX127xCheckRfFrequency,
.TimeOnAir = SX127xGetTimeOnAir,
.Send = SX127xSend,
.Sleep = SX127xSetSleep,
.Standby = SX127xSetStby,
.Rx = SX127xSetRx,
.Write = SX127xWrite,
.Read = SX127xRead,
.WriteBuffer = SX127xWriteBuffer,
.ReadBuffer = SX127xReadBuffer,
.SetMaxPayloadLength = SX127xSetMaxPayloadLength,
.SetPublicNetwork = SX127xSetPublicNetwork,
.GetWakeupTime = SX127xGetWakeupTime,
.IrqProcess = NULL,
.RxBoosted = NULL,
.SetRxDutyCycle = NULL,
.SetTxContinuousWave = SX127xSetTxContinuousWave,
};
static int sx127x_antenna_configure(void)
{
int ret;
ret = sx12xx_configure_pin(antenna_enable, GPIO_OUTPUT_INACTIVE);
if (ret) {
return ret;
}
ret = sx12xx_configure_pin(rfi_enable, GPIO_OUTPUT_INACTIVE);
if (ret) {
return ret;
}
ret = sx12xx_configure_pin(rfo_enable, GPIO_OUTPUT_INACTIVE);
if (ret) {
return ret;
}
ret = sx12xx_configure_pin(pa_boost_enable, GPIO_OUTPUT_INACTIVE);
if (ret) {
return ret;
}
return 0;
}
static int sx127x_lora_init(const struct device *dev)
{
int ret;
uint8_t regval;
if (!spi_is_ready_dt(&dev_config.bus)) {
LOG_ERR("SPI device not ready");
return -ENODEV;
}
ret = sx12xx_configure_pin(tcxo_power, GPIO_OUTPUT_INACTIVE);
if (ret) {
return ret;
}
/* Setup Reset gpio and perform soft reset */
ret = sx12xx_configure_pin(reset, GPIO_OUTPUT_ACTIVE);
if (ret) {
return ret;
}
k_sleep(K_MSEC(100));
gpio_pin_set_dt(&dev_config.reset, 0);
k_sleep(K_MSEC(100));
ret = sx127x_read(REG_VERSION, &regval, 1);
if (ret < 0) {
LOG_ERR("Unable to read version info");
return -EIO;
}
LOG_INF("SX127x version 0x%02x found", regval);
ret = sx127x_antenna_configure();
if (ret < 0) {
LOG_ERR("Unable to configure antenna");
return -EIO;
}
ret = sx12xx_init(dev);
if (ret < 0) {
LOG_ERR("Failed to initialize SX12xx common");
return ret;
}
return 0;
}
static DEVICE_API(lora, sx127x_lora_api) = {
.config = sx12xx_lora_config,
.send = sx12xx_lora_send,
.send_async = sx12xx_lora_send_async,
.recv = sx12xx_lora_recv,
.recv_async = sx12xx_lora_recv_async,
.test_cw = sx12xx_lora_test_cw,
};
DEVICE_DT_INST_DEFINE(0, &sx127x_lora_init, NULL, NULL,
NULL, POST_KERNEL, CONFIG_LORA_INIT_PRIORITY,
&sx127x_lora_api);