fix writing fifo

components/sx127x_driver/sx127x_registers.c

@@ -256,7 +256,7 @@ esp_err_t sx127x_write_fifo(sx127x_t *hndl, const char *data, size_t data_len) {
   spi_transaction_t trans;
   memset(&trans, 0, sizeof(trans));
   trans.flags     = 0;
-  trans.addr      = SX127X_REG_FIFO;
+  trans.addr      = SX127X_REG_FIFO | 0x80;
   trans.length    = 8 * data_len;
   trans.tx_buffer = data;
   trans.rxlength  = 0;
@@ -281,7 +281,7 @@ esp_err_t sx127x_read_fifo(sx127x_t *hndl, char *data_out, size_t data_len) {
   trans.addr      = SX127X_REG_FIFO;
   trans.length    = 8 * data_len;
   trans.tx_buffer = NULL;
-  trans.rxlength  = 0;  // match length
+  trans.rxlength  = 8 * data_len;
   trans.rx_buffer = data_out;
 
   BaseType_t pdRet = xSemaphoreTake(hndl->spi_mutex, SX127X_MUTEX_TIMOUT);