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Bluetooth: nble: Implement bt_enable

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Resets Nordic BLE chip and opens communication channel to UART.

Change-Id: Ie516869a4d978fc1622361ebc42894430fdf9ea6
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
This commit is contained in:
Andrei Emeltchenko 2016-01-15 15:45:13 +02:00 • committed by Anas Nashif
commit 124795afed
3 changed files with 119 additions and 1 deletions
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112
drivers/nble/gap.c
View file

@ -16,12 +16,122 @@
#include <errno.h>
#include <nanokernel.h>
#include <device.h>
#include <gpio.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/conn.h>
#include <bluetooth/log.h>
#include "uart.h"
#define NBLE_SWDIO_PIN 6
#define NBLE_RESET_PIN NBLE_SWDIO_PIN
#define NBLE_CHANNEL 0
static void *channel;
/**
* Function handling the events from the UART IPC (irq).
*
* @param channel Channel on which the event applies
* @param request IPC_MSG_TYPE_MESSAGE when a new message was received,
* IPC_MSG_TYPE_FREE when the previous message was sent and can be freed.
* @param len Length of the data
* @param p_data Pointer to the data
* @return 0
*/
static int recv_cb(int channel, int request, int len, void *p_data)
{
BT_DBG("channel %d request %d len %d", channel, request, len);
switch (request) {
case IPC_MSG_TYPE_MESSAGE:
break;
case IPC_MSG_TYPE_FREE:
/* TODO: Try to send another message immediately */
break;
default:
/* Free the message */
BT_ERR("Unsupported RPC request");
break;
}
return 0;
}
int bt_enable(bt_ready_cb_t cb)
{
return -ENOSYS;
struct device *gpio;
int ret;
BT_DBG("");
gpio = device_get_binding(CONFIG_GPIO_DW_0_NAME);
if (!gpio) {
BT_ERR("Cannot find %", CONFIG_GPIO_DW_0_NAME);
return -ENODEV;
}
ret = gpio_pin_configure(gpio, NBLE_RESET_PIN, GPIO_DIR_OUT);
if (ret) {
BT_ERR("Error configuring pin %d", NBLE_RESET_PIN);
return -ENODEV;
}
/* Reset hold time is 0.2us (normal) or 100us (SWD debug) */
ret = gpio_pin_write(gpio, NBLE_RESET_PIN, 0);
if (ret) {
BT_ERR("Error pin write %d", NBLE_RESET_PIN);
return -EINVAL;
}
/**
* NBLE reset is achieved by asserting low the SWDIO pin.
* However, the BLE Core chip can be in SWD debug mode,
* and NRF_POWER->RESET = 0 due to, other constraints: therefore,
* this reset might not work everytime, especially after
* flashing or debugging.
*/
/* sleep 1ms depending on context */
switch (sys_execution_context_type_get()) {
case NANO_CTX_FIBER:
fiber_sleep(MSEC(1));
break;
case NANO_CTX_TASK:
task_sleep(MSEC(1));
break;
default:
BT_ERR("ISR context is not supported");
return -EINVAL;
}
/* Open the UART channel for RPC while Nordic is in reset */
channel = ipc_uart_channel_open(NBLE_CHANNEL, recv_cb);
BT_DBG("channel %p", channel);
ret = nble_open();
if (ret) {
return ret;
}
ret = gpio_pin_write(gpio, NBLE_RESET_PIN, 1);
if (ret) {
BT_ERR("Error pin write %d", NBLE_RESET_PIN);
return -EINVAL;
}
/* Set back GPIO to input to avoid interfering with external debugger */
ret = gpio_pin_configure(gpio, NBLE_RESET_PIN, GPIO_DIR_IN);
if (ret) {
BT_ERR("Error configuring pin %d", NBLE_RESET_PIN);
return -ENODEV;
}
return 0;
}
int bt_le_adv_start(const struct bt_le_adv_param *param,