diff --git a/src/modules/LR2021/LR2021.cpp b/src/modules/LR2021/LR2021.cpp
index e8b1c530..b72443a2 100644
--- a/src/modules/LR2021/LR2021.cpp
+++ b/src/modules/LR2021/LR2021.cpp
@@ -21,6 +21,27 @@ LR2021::LR2021(Module* mod) : PhysicalLayer() {
   this->irqMap[RADIOLIB_IRQ_TIMEOUT] = RADIOLIB_LR2021_IRQ_TIMEOUT;
 }
 
+int16_t LR2021::sleep() {
+  return(this->sleep(RADIOLIB_LR2021_SLEEP_RETENTION_ENABLED, 0));
+}
+
+int16_t LR2021::sleep(uint8_t cfg, uint32_t time) {
+  // set RF switch (if present)
+  this->mod->setRfSwitchState(Module::MODE_IDLE);
+
+  uint8_t buff[] = { cfg,
+    (uint8_t)((time >> 24) & 0xFF), (uint8_t)((time >> 16) & 0xFF),
+    (uint8_t)((time >> 8) & 0xFF), (uint8_t)(time & 0xFF),
+  };
+
+  int16_t state = this->SPIcommand(RADIOLIB_LR2021_CMD_SET_SLEEP, true, buff, sizeof(buff));
+
+  // wait for the module to safely enter sleep mode
+  this->mod->hal->delay(1);
+
+  return(state);
+}
+
 Module* LR2021::getMod() {
   return(this->mod);
 }
diff --git a/src/modules/LR2021/LR2021.h b/src/modules/LR2021/LR2021.h
index 8cd2dede..20e9d776 100644
--- a/src/modules/LR2021/LR2021.h
+++ b/src/modules/LR2021/LR2021.h
@@ -187,6 +187,16 @@
 #define RADIOLIB_LR2021_IRQ_RNG_EXCH_VALID                      (0x01UL << 30)  //  31    0                master receive valid ranging response
 #define RADIOLIB_LR2021_IRQ_RNG_TIMEOUT                         (0x01UL << 31)  //  31    0                ranging timeout
 
+// RADIOLIB_LR2021_CMD_WRITE_REG_MEM
+#define RADIOLIB_LR2021_SPI_MAX_READ_WRITE_LEN                  (256)           //  7     0     maximum length of read/write SPI payload in bytes
+
+// RADIOLIB_LR2021_CMD_SET_SLEEP
+#define RADIOLIB_LR2021_SLEEP_32K_CLK_DISABLED                  (0x00UL << 0)   //  0     0     32 kHz clock: disabled
+#define RADIOLIB_LR2021_SLEEP_32K_CLK_ENABLED                   (0x01UL << 0)   //  0     0                   enabled
+#define RADIOLIB_LR2021_SLEEP_RETENTION_DISABLED                (0x00UL << 1)   //  1     1     configuration retention in sleep mode: disabled
+#define RADIOLIB_LR2021_SLEEP_RETENTION_ENABLED                 (0x01UL << 1)   //  1     1                                            enabled
+
+
 /*!
   \class LR2021
   \brief 
@@ -206,6 +216,9 @@ class LR2021: public PhysicalLayer {
     */
     explicit LR2021(Module* mod);
     
+    int16_t sleep();
+    int16_t sleep(uint8_t cfg, uint32_t time);
+    
 #if !RADIOLIB_GODMODE && !RADIOLIB_LOW_LEVEL
   protected:
 #endif
@@ -223,6 +236,13 @@ class LR2021: public PhysicalLayer {
 
     static int16_t SPIparseStatus(uint8_t in);
     static int16_t SPIcheckStatus(Module* mod);
+
+    int16_t readRadioRxFifo(uint8_t* data, size_t len);
+    int16_t writeRadioTxFifo(uint8_t* data, size_t len);
+    int16_t writeRegMem32(uint32_t addr, const uint32_t* data, size_t len);
+    int16_t writeRegMemMask32(uint32_t addr, uint32_t mask, uint32_t data);
+    int16_t readRegMem32(uint32_t addr, uint32_t* data, size_t len);
+
 };
 
 #endif
diff --git a/src/modules/LR2021/LR2021_commands.cpp b/src/modules/LR2021/LR2021_commands.cpp
index e11aa494..599d2da6 100644
--- a/src/modules/LR2021/LR2021_commands.cpp
+++ b/src/modules/LR2021/LR2021_commands.cpp
@@ -1,10 +1,74 @@
 #include "LR2021.h"
 
+#include "../LR11x0/LR_common.h"
+
 #include <string.h>
 #include <math.h>
 
 #if !RADIOLIB_EXCLUDE_LR2021
 
+int16_t LR2021::readRadioRxFifo(uint8_t* data, size_t len) {
+  return(this->SPIcommand(RADIOLIB_LR2021_CMD_READ_RX_FIFO, false, data, len, NULL, 0));
+}
 
+int16_t LR2021::writeRadioTxFifo(uint8_t* data, size_t len) {
+  return(this->SPIcommand(RADIOLIB_LR2021_CMD_WRITE_TX_FIFO, true, data, len, NULL, 0));
+}
 
+// TODO reuse LR11x0 method
+int16_t LR2021::writeRegMem32(uint32_t addr, const uint32_t* data, size_t len) {
+  // check maximum size
+  if(len > (RADIOLIB_LR2021_SPI_MAX_READ_WRITE_LEN/sizeof(uint32_t))) {
+    return(RADIOLIB_ERR_SPI_CMD_INVALID);
+  }
+  return(LR_writeCommon(this->mod, RADIOLIB_LR2021_CMD_WRITE_REG_MEM_32, addr, data, len, false));
+}
+
+// TODO reuse LR11x0 method
+int16_t LR2021::writeRegMemMask32(uint32_t addr, uint32_t mask, uint32_t data) {
+  uint8_t buff[12] = {
+    (uint8_t)((addr >> 24) & 0xFF), (uint8_t)((addr >> 16) & 0xFF), (uint8_t)((addr >> 8) & 0xFF), (uint8_t)(addr & 0xFF),
+    (uint8_t)((mask >> 24) & 0xFF), (uint8_t)((mask >> 16) & 0xFF), (uint8_t)((mask >> 8) & 0xFF), (uint8_t)(mask & 0xFF),
+    (uint8_t)((data >> 24) & 0xFF), (uint8_t)((data >> 16) & 0xFF), (uint8_t)((data >> 8) & 0xFF), (uint8_t)(data & 0xFF),
+  };
+  return(this->SPIcommand(RADIOLIB_LR2021_CMD_WRITE_REG_MEM_MASK_32, true, buff, sizeof(buff)));
+}
+
+// TODO reuse LR11x0 method
+int16_t LR2021::readRegMem32(uint32_t addr, uint32_t* data, size_t len) {
+  // check maximum size
+  if(len >= (RADIOLIB_LR2021_SPI_MAX_READ_WRITE_LEN/sizeof(uint32_t))) {
+    return(RADIOLIB_ERR_SPI_CMD_INVALID);
+  }
+
+  // the request contains the address and length
+  uint8_t reqBuff[5] = {
+    (uint8_t)((addr >> 24) & 0xFF), (uint8_t)((addr >> 16) & 0xFF),
+    (uint8_t)((addr >> 8) & 0xFF), (uint8_t)(addr & 0xFF),
+    (uint8_t)len,
+  };
+
+  // build buffers - later we need to ensure endians are correct, 
+  // so there is probably no way to do this without copying buffers and iterating
+  #if RADIOLIB_STATIC_ONLY
+    uint8_t rplBuff[RADIOLIB_LR2021_SPI_MAX_READ_WRITE_LEN];
+  #else
+    uint8_t* rplBuff = new uint8_t[len*sizeof(uint32_t)];
+  #endif
+
+  int16_t state = this->SPIcommand(RADIOLIB_LR2021_CMD_READ_REG_MEM_32, false, rplBuff, len*sizeof(uint32_t), reqBuff, sizeof(reqBuff));
+
+  // convert endians
+  if(data && (state == RADIOLIB_ERR_NONE)) {
+    for(size_t i = 0; i < len; i++) {
+      data[i] = ((uint32_t)rplBuff[2 + i*sizeof(uint32_t)] << 24) | ((uint32_t)rplBuff[3 + i*sizeof(uint32_t)] << 16) | ((uint32_t)rplBuff[4 + i*sizeof(uint32_t)] << 8) | (uint32_t)rplBuff[5 + i*sizeof(uint32_t)];
+    }
+  }
+
+  #if !RADIOLIB_STATIC_ONLY
+    delete[] rplBuff;
+  #endif
+  
+  return(state);
+}
 #endif