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drivers: lora: add support for runtime power adjustments #3

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Merged
sbowles-gp merged 1 commit into from
May 20, 2026
Merged

drivers: lora: add support for runtime power adjustments #3

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9 changes: 1 addition & 8 deletions drivers/lora/loramac_node/sx126x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -290,13 +290,6 @@ RadioOperatingModes_t SX126xGetOperatingMode(void)
return dev_data.mode;
}

#if HAVE_GPIO_FE_CTRL
static const enum {
RFO_LP,
RFO_HP,
} pa_output = DT_INST_STRING_UPPER_TOKEN(0, power_amplifier_output);
#endif

#define LORA_NODE DT_NODELABEL(lora)


Expand Down Expand Up @@ -324,7 +317,7 @@ void SX126xSetOperatingMode(RadioOperatingModes_t mode)
sx126x_set_tx_enable(1);
#endif
#if HAVE_GPIO_FE_CTRL
if (pa_output == RFO_LP) {
if (sx126x_get_tx_power_mode() == RFO_LP) {
sx126x_set_fe_ctrl(txlp_fe_ctrl_lines[0], txlp_fe_ctrl_lines[1], txlp_fe_ctrl_lines[2]);
} else {
sx126x_set_fe_ctrl(txhp_fe_ctrl_lines[0], txhp_fe_ctrl_lines[1], txhp_fe_ctrl_lines[2]);
Expand Down
8 changes: 8 additions & 0 deletions drivers/lora/loramac_node/sx126x_common.h
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Expand Up @@ -35,6 +35,7 @@
#define HAVE_GPIO_TX_ENABLE DT_INST_NODE_HAS_PROP(0, tx_enable_gpios)
#define HAVE_GPIO_RX_ENABLE DT_INST_NODE_HAS_PROP(0, rx_enable_gpios)
#define HAVE_GPIO_FE_CTRL (DT_INST_NODE_HAS_PROP(0, fe_ctrl1_enable_gpios) && !DT_INST_NODE_HAS_PROP(0, tx_enable_gpios))
#define HAVE_PA_OUTPUT_LOCKED DT_INST_NODE_HAS_PROP(0, power_amplifier_output)

struct sx126x_config {
struct spi_dt_spec bus;
Expand Down Expand Up @@ -74,6 +75,13 @@ void sx126x_dio1_irq_disable(struct sx126x_data *dev_data);

void sx126x_set_tx_params(int8_t power, RadioRampTimes_t ramp_time);

enum sx126x_pa_output {
RFO_LP,
RFO_HP,
};

enum sx126x_pa_output sx126x_get_tx_power_mode(void);

int sx126x_variant_init(const struct device *dev);

#endif /* ZEPHYR_DRIVERS_SX126X_COMMON_H_ */
30 changes: 26 additions & 4 deletions drivers/lora/loramac_node/sx126x_stm32wl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,13 @@
#include <zephyr/irq.h>
LOG_MODULE_DECLARE(sx126x, CONFIG_LORA_LOG_LEVEL);

static const enum {
RFO_LP,
RFO_HP,
} pa_output = DT_INST_STRING_UPPER_TOKEN(0, power_amplifier_output);
#if HAVE_PA_OUTPUT_LOCKED
static enum sx126x_pa_output pa_output =
DT_INST_STRING_UPPER_TOKEN(0, power_amplifier_output);
#else
static enum sx126x_pa_output pa_output = RFO_LP;
#endif
Comment thread
ringlej marked this conversation as resolved.
static const bool pa_output_locked = HAVE_PA_OUTPUT_LOCKED;

void sx126x_reset(struct sx126x_data *dev_data)
{
Expand Down Expand Up @@ -53,6 +56,18 @@ void sx126x_dio1_irq_disable(struct sx126x_data *dev_data)
void sx126x_set_tx_params(int8_t power, RadioRampTimes_t ramp_time)
{
uint8_t buf[2];
const int8_t lp_max = DT_INST_PROP(0, rfo_lp_max_power);

if (!pa_output_locked) {
/* Auto-select PA output based on requested power level */
if (power > lp_max) {
pa_output = RFO_HP;
} else {
pa_output = RFO_LP;
}
}

LOG_DBG("tx_params PA mode: %s", pa_output == RFO_LP ? "RFO_LP" : "RFO_HP");

if (pa_output == RFO_LP) {
const int8_t max_power = DT_INST_PROP(0, rfo_lp_max_power);
Expand Down Expand Up @@ -110,6 +125,8 @@ void sx126x_set_tx_params(int8_t power, RadioRampTimes_t ramp_time)
SX126xWriteRegister(REG_OCP, 0x38);
}

LOG_DBG("tx_params final: reg_power=%d ramp=%u", power, ramp_time);

buf[0] = power;
buf[1] = (uint8_t)ramp_time;
SX126xWriteCommand(RADIO_SET_TXPARAMS, buf, 2);
Expand All @@ -123,6 +140,11 @@ static void radio_isr(const struct device *dev)
k_work_submit(&dev_data->dio1_irq_work);
}

enum sx126x_pa_output sx126x_get_tx_power_mode(void)
{
return pa_output;
}

int sx126x_variant_init(const struct device *dev)
{
IRQ_CONNECT(DT_INST_IRQN(0),
Expand Down
1 change: 0 additions & 1 deletion dts/bindings/lora/st,stm32wl-subghz-radio.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,6 @@ properties:

power-amplifier-output:
type: string
required: true
description: |
Selects between the low- and high-power power amplifier output pin.
enum:
Expand Down
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