From 324d03b53c9ebc9cd642eefc15221b246cb3871e Mon Sep 17 00:00:00 2001
From: Billy Kozak <bkozak@scanimetrics.com>
Date: Mon, 14 Sep 2015 13:18:01 -0600
Subject: [PATCH] CC26xx - fully shutdown the rf-core & abort rx op

Prior to this patch, the ieee radio driver did not explicitly abort
the rx operation or power down the analog components of the radio
prior to shutting down the rf-core.

The result of this was that the rf-core continued to use a lot of
power even while "off".

This patch fixes this problem.
---
 cpu/cc26xx-cc13xx/rf-core/ieee-mode.c |  2 ++
 cpu/cc26xx-cc13xx/rf-core/rf-core.c   | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/cpu/cc26xx-cc13xx/rf-core/ieee-mode.c b/cpu/cc26xx-cc13xx/rf-core/ieee-mode.c
index b5b5cf4c1..999160de7 100644
--- a/cpu/cc26xx-cc13xx/rf-core/ieee-mode.c
+++ b/cpu/cc26xx-cc13xx/rf-core/ieee-mode.c
@@ -1101,6 +1101,8 @@ off(void)
 
   while(transmitting());
 
+  /* stopping the rx explicitly results in lower sleep-mode power usage */
+  rx_off();
   rf_core_power_down();
 
   /* Switch HF clock source to the RCOSC to preserve power */
diff --git a/cpu/cc26xx-cc13xx/rf-core/rf-core.c b/cpu/cc26xx-cc13xx/rf-core/rf-core.c
index 45387ab42..b511ba6dd 100644
--- a/cpu/cc26xx-cc13xx/rf-core/rf-core.c
+++ b/cpu/cc26xx-cc13xx/rf-core/rf-core.c
@@ -201,6 +201,28 @@ rf_core_wait_cmd_done(void *cmd)
          == RF_CORE_RADIO_OP_STATUS_DONE_OK;
 }
 /*---------------------------------------------------------------------------*/
+static int
+fs_powerdown(void)
+{
+  rfc_CMD_FS_POWERDOWN_t cmd;
+  uint32_t cmd_status;
+
+  rf_core_init_radio_op((rfc_radioOp_t *)&cmd, sizeof(cmd), CMD_FS_POWERDOWN);
+
+  if(rf_core_send_cmd((uint32_t)&cmd, &cmd_status) != RF_CORE_CMD_OK) {
+    PRINTF("fs_powerdown: CMDSTA=0x%08lx\n", cmd_status);
+    return RF_CORE_CMD_ERROR;
+  }
+
+  if(rf_core_wait_cmd_done(&cmd) != RF_CORE_CMD_OK) {
+    PRINTF("fs_powerdown: CMDSTA=0x%08lx, status=0x%04x\n",
+           cmd_status, cmd.status);
+    return RF_CORE_CMD_ERROR;
+  }
+
+  return RF_CORE_CMD_OK;
+}
+/*---------------------------------------------------------------------------*/
 int
 rf_core_power_up()
 {
@@ -256,6 +278,9 @@ rf_core_power_down()
   if(rf_core_is_accessible()) {
     HWREG(RFC_DBELL_NONBUF_BASE + RFC_DBELL_O_RFCPEIFG) = 0x0;
     HWREG(RFC_DBELL_NONBUF_BASE + RFC_DBELL_O_RFCPEIEN) = 0x0;
+
+    /* need to send FS_POWERDOWN or analog components will use power */
+    fs_powerdown();
   }
 
   /* Shut down the RFCORE clock domain in the MCU VD */