Merge pull request #15017 from hallard/STM32WL_HP_optimal

STM32WL fixed current consumption for mode RBI_CONF_RFO_HP
ARMmbed · Aug 30, 2021 · 539d1c7 · 539d1c7
2 parents d2a88f4 + 6d07477
commit 539d1c7
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Showing 2 changed files with 20 additions and 2 deletions.
diff --git a/connectivity/drivers/lora/TARGET_STM32WL/STM32WL_LoRaRadio.cpp b/connectivity/drivers/lora/TARGET_STM32WL/STM32WL_LoRaRadio.cpp
@@ -452,7 +452,25 @@ void STM32WL_LoRaRadio::SUBGRF_SetTxParams(uint8_t paSelect, int8_t power, radio
  // RegTxClampConfig = @address 0x08D8
  write_to_register(REG_TX_CLAMP, read_register(REG_TX_CLAMP) | (0x0F << 1));
 
- set_pa_config(0x04, 0x07, 0x00, 0x01);
+ // if in mbed_app.json we have configured rf_switch_config in rfo_hp ONLY
+ // so "stm32wl-lora-driver.rf_switch_config": "RBI_CONF_RFO_HP"
+ // in this particular case it's not optimal settings for power<=20dBm
+ if (board_rf_switch_config == RBI_CONF_RFO_HP) {
+ // See Section 5.1.2 of the following Application Note
+ // https://www.st.com/resource/en/application_note/an5457-rf-matching-network-design-guide-for-stm32wl-series-stmicroelectronics.pdf
+ if (power > 20) {
+ set_pa_config(0x04, 0x07, 0x00, 0x01);
+ } else if (power > 17) {
+ set_pa_config(0x03, 0x05, 0x00, 0x01);
+ } else if (power > 14) {
+ set_pa_config(0x02, 0x03, 0x00, 0x01);
+ } else {
+ set_pa_config(0x02, 0x02, 0x00, 0x01);
+ }
+ } else {
+ set_pa_config(0x04, 0x07, 0x00, 0x01);
+ }
+
  if (power > 22) {
  power = 22;
  } else if (power < -9) {

diff --git a/connectivity/drivers/lora/TARGET_STM32WL/mbed_lib.json b/connectivity/drivers/lora/TARGET_STM32WL/mbed_lib.json
@@ -26,7 +26,7 @@
  "value": "IS_TCXO_SUPPORTED"
  },
  "rf_switch_config": {
- "help": "Default: CONF_RFO_LP_HP = 0, CONF_RFO_LP = 1, CONF_RFO_HP = 2",
+ "help": "Default: RBI_CONF_RFO_LP_HP = 0, RBI_CONF_RFO_LP = 1, RBI_CONF_RFO_HP = 2",
  "value": "RBI_CONF_RFO_LP_HP"
  },
  "rf_wakeup_time": {