1概述
定时器能够被配置为两种模式：定时模式和计数模式,nrf52832有五个定时器，timer0--timer4 。
2常用得函数
函数功能：初始化定时器
ret_code_t nrf_drv_timer_init (
nrf_drv_timer_t const *const p_instance, //指向定时器驱动程序实例结构体的指针
nrf_drv_timer_config_t const * p_config, //初始化结构体，如果是NULL，使用默认配置参数
nrf_timer_event_handler_t timer_event_handler //事件句柄，不能为NULL
)
函数功能：毫秒转ticks函数
函数功能：Function for converting time in milliseconds to timer ticks.
__STATIC_INLINE uint32_t nrf_drv_timer_ms_to_ticks
(
nrf_drv_timer_t const *const p_instance, //指向定时器驱动程序实例结构体的指针
uint32_t time_ms //毫秒数
)
函数功能：拓展比较模式下设置Timer通道
void nrf_drv_timer_extended_compare (
nrf_drv_timer_t const *const p_instance, //指向定时器驱动程序实例结构体的指针
nrf_timer_cc_channel_t cc_channel, //比较通道编号
uint32_t cc_value, //比较值
nrf_timer_short_mask_t timer_short_mask, //该通道上的比较事件和Timer任务
bool enable_int //开启或关闭比较通道的中断
)
函数功能：开启定时器
void nrf_drv_timer_enable ( nrf_drv_timer_t const *const p_instance )
函数参数：[in] p_instance Pointer to the driver instance structure. //指向定时器驱动程序实例结构体指针
DEMO
1 裸机下定时器
const nrf_drv_timer_t mytimer = NRF_DRV_TIMER_INSTANCE(0); //定义驱动程序实例
void timer_led_handler(nrf_timer_event_t event_type, void* p_context) //定时时间到回调函数
{
switch(event_type)
{
case NRF_TIMER_EVENT_COMPARE0:
//LED翻转
nrf_gpio_pin_toggle(LED_2);
break;
default:break;
}
}
int main(void)
{
uint32_t time_ms = 500; //Time(in miliseconds) between consecutive compare events.
uint32_t time_ticks;
uint32_t err_code = NRF_SUCCESS;
LEDS_CONFIGURE(LEDS_MASK);//配置开发板上驱动LED的管脚为输出
LEDS_OFF(LEDS_MASK);
//Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other.
err_code = nrf_drv_timer_init(&TIMER_LED, NULL, timer_led_event_handler);
APP_ERROR_CHECK(err_code);
//定时时间ms转为ticks
time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);
//设置定时时间捕获/比较通道及该通道的比较值，使能通道的比较中断
nrf_drv_timer_extended_compare(
&TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
//启动定时器
nrf_drv_timer_enable(&TIMER_LED);
while(1)
{
__WFI();//进入睡眠，等待中断
}
}
2 蓝牙协议栈下，定时器和PPI配合SAADC多通道采样
/***********************************************************
例程说明：
SAADC采样开发板上电位器，光敏电阻和芯片电压，并通过BLE串口透传的方式将电压发送到APP端
时间：2018/8/10
************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "boards.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "fstorage.h"
#include "fds.h"
#include "peer_manager.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "sensorsim.h"
#include "nrf_gpio.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_state.h"
#define NRF_LOG_MODULE_NAME "APP"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
/******自己定义的宏或添加的头文件*****************/
#include "app_uart.h"
#include "ble_nus_demo.h"
#include "nrf_drv_saadc.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#define SAMPLES_IN_BUFFER 3 //定义SAADC采样缓存数组大小
#define UART_TX_BUF_SIZE 256 //定义缓存的大小
#define UART_RX_BUF_SIZE 256
#define BLE_NUS_MAX_DATA_LEN 20
static ble_nus_t m_nus;
static nrf_saadc_value_t m_buffer_pool[SAMPLES_IN_BUFFER]; //定义SAADC采样缓存数组
APP_TIMER_DEF(m_adc_sampling_timer_id); //定义指向定时器的ID
//#define ADC_SAMPLING_INTERVAL APP_TIMER_TICKS(1000, APP_TIMER_PRESCALER)/* ADC采样应用定时器定时时间：1秒 */
nrf_ppi_channel_t my_ppi_channel; //ppi通道号
static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(2); //定义Timer2的驱动程序实例
/************************************************/
#define IS_SRVC_CHANGED_CHARACT_PRESENT 1 /**< Include or not the service_changed characteristic. if not enabled, the server's database cannot be changed for the lifetime of the device*/
#if (NRF_SD_BLE_API_VERSION == 3)
#define NRF_BLE_MAX_MTU_SIZE GATT_MTU_SIZE_DEFAULT /**< MTU size used in the softdevice enabling and to reply to a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event. */
#endif
#define APP_FEATURE_NOT_SUPPORTED BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2 /**< Reply when unsupported features are requested. */
#define CENTRAL_LINK_COUNT 0 /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT 1 /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/
#define DEVICE_NAME "Nordic_Template" /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME "NordicSemiconductor" /**< Manufacturer. Will be passed to Device Information Service. */
#define APP_ADV_INTERVAL 300 /**< The advertising interval (in units of 0.625 ms. This value corresponds to 187.5 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS 180 /**< The advertising timeout in units of seconds. */
#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(100, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.1 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(200, UNIT_1_25_MS) /**< Maximum acceptable connection interval (0.2 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */
#define SEC_PARAM_BOND 1 /**< Perform bonding. */
#define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */
#define SEC_PARAM_LESC 0 /**< LE Secure Connections not enabled. */
#define SEC_PARAM_KEYPRESS 0 /**< Keypress notifications not enabled. */
#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */
#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */
#define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**< Handle of the current connection. */
/* YOUR_JOB: Declare all services structure your application is using
static ble_xx_service_t m_xxs;
static ble_yy_service_t m_yys;
*/
// YOUR_JOB: Use UUIDs for service(s) used in your application.
static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}}; /**< Universally unique service identifiers. */
static void advertising_start(void);
/**@brief Callback function for asserts in the SoftDevice.
*
* @details This function will be called in case of an assert in the SoftDevice.
*
* @warning This handler is an example only and does not fit a final product. You need to analyze
* how your product is supposed to react in case of Assert.
* @warning On assert from the SoftDevice, the system can only recover on reset.
*
* @param[in] line_num Line number of the failing ASSERT call.
* @param[in] file_name File name of the failing ASSERT call.
*/
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
app_error_handler(DEAD_BEEF, line_num, p_file_name);
}
/**@brief Function for handling Peer Manager events.
*
* @param[in] p_evt Peer Manager event.
*/
static void pm_evt_handler(pm_evt_t const * p_evt)
{
ret_code_t err_code;
switch (p_evt->evt_id)
{
case PM_EVT_BONDED_PEER_CONNECTED:
{
NRF_LOG_INFO("Connected to a previously bonded device.
");
} break;
case PM_EVT_CONN_SEC_SUCCEEDED:
{
NRF_LOG_INFO("Connection secured. Role: %d. conn_handle: %d, Procedure: %d
",
ble_conn_state_role(p_evt->conn_handle),
p_evt->conn_handle,
p_evt->params.conn_sec_succeeded.procedure);
} break;
case PM_EVT_CONN_SEC_FAILED:
{
/* Often, when securing fails, it shouldn't be restarted, for security reasons.
* Other times, it can be restarted directly.
* Sometimes it can be restarted, but only after changing some Security Parameters.
* Sometimes, it cannot be restarted until the link is disconnected and reconnected.
* Sometimes it is impossible, to secure the link, or the peer device does not support it.
* How to handle this error is highly application dependent. */
} break;
case PM_EVT_CONN_SEC_CONFIG_REQ:
{
// Reject pairing request from an already bonded peer.
pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
} break;
case PM_EVT_STORAGE_FULL:
{
// Run garbage collection on the flash.
err_code = fds_gc();
if (err_code == FDS_ERR_BUSY || err_code == FDS_ERR_NO_SPACE_IN_QUEUES)
{
// Retry.
}
else
{
APP_ERROR_CHECK(err_code);
}
} break;
case PM_EVT_PEERS_DELETE_SUCCEEDED:
{
advertising_start();
} break;
case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
{
// The local database has likely changed, send service changed indications.
pm_local_database_has_changed();
} break;
case PM_EVT_PEER_DATA_UPDATE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peer_data_update_failed.error);
} break;
case PM_EVT_PEER_DELETE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
} break;
case PM_EVT_PEERS_DELETE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
} break;
case PM_EVT_ERROR_UNEXPECTED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
} break;
case PM_EVT_CONN_SEC_START:
case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
case PM_EVT_PEER_DELETE_SUCCEEDED:
case PM_EVT_LOCAL_DB_CACHE_APPLIED:
case PM_EVT_SERVICE_CHANGED_IND_SENT:
case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
default:
break;
}
}
//定时器回调函数，在回调函数中重新开始ADC采样
static void saadc_sampling_timeout_handler(void * p_context)
{
/*
定时时间到后，PPI触发采样任务，因此定时器的回调函数中并不做什么处理。
但函数初始化要求必须添加一个回调函数。
*/
// UNUSED_PARAMETER(p_context);
// printf("saadc_sampling_timeout_handler
");
//启动一次ADC采样。
// nrf_drv_saadc_sample();
// printf("time out
");
}
/**@brief Function for the Timer initialization.
*
* @details Initializes the timer module. This creates and starts application timers.
*/
static void timers_init(void)
{
uint32_t timer_err_code;
// Initialize timer module.
APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
//创建应用定时器
// timer_err_code=app_timer_create(&m_adc_sampling_timer_id,
// APP_TIMER_MODE_REPEATED,
// saadc_sampling_timeout_handler);
// APP_ERROR_CHECK(timer_err_code);
}
/**@brief Function for the GAP initialization.
*
* @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
* device including the device name, appearance, and the preferred connection parameters.
*/
static void gap_params_init(void)
{
uint32_t err_code;
ble_gap_conn_params_t gap_conn_params;
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
err_code = sd_ble_gap_device_name_set(&sec_mode,
(const uint8_t *)DEVICE_NAME,
strlen(DEVICE_NAME));
APP_ERROR_CHECK(err_code);
/* YOUR_JOB: Use an appearance value matching the application's use case.
err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_);
APP_ERROR_CHECK(err_code); */
memset(&gap_conn_params, 0, sizeof(gap_conn_params));
gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
gap_conn_params.slave_latency = SLAVE_LATENCY;
gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;
err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling the YYY Service events.
* YOUR_JOB implement a service handler function depending on the event the service you are using can generate
*
* @details This function will be called for all YY Service events which are passed to
* the application.
*
* @param[in] p_yy_service YY Service structure.
* @param[in] p_evt Event received from the YY Service.
*
*
static void on_yys_evt(ble_yy_service_t * p_yy_service,
ble_yy_service_evt_t * p_evt)
{
switch (p_evt->evt_type)
{
case BLE_YY_NAME_EVT_WRITE:
APPL_LOG("[APPL]: charact written with value %s.
", p_evt->params.char_xx.value.p_str);
break;
default:
// No implementation needed.
break;
}
}*/
//串口打印nus收到的数据，也就是APP端传给单片机的数据
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
//串口打印nus接收到的数据
for(uint32_t i=0;i<length;i++)
{
while(app_uart_put(p_data[i]) != NRF_SUCCESS);
}
//串口打印回车换行符
while(app_uart_put('
') != NRF_SUCCESS);
while(app_uart_put('
') != NRF_SUCCESS);
}
/**@brief Function for initializing services that will be used by the application.
*/
static void services_init(void)
{
uint32_t err_code;
ble_nus_init_t nus_init; //定义一个服务初始化结构体
memset(&nus_init,0,sizeof(nus_init));//先清零化结构体
nus_init.data_handler=nus_data_handler; //结构体变量赋值，串口接收数据处理回调函数
//调用串口服务初始化函数，初始化服务，初始化成功后，协议栈返回的信息存放在m_nus中
err_code=ble_nus_init(&m_nus,&nus_init);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling the Connection Parameters Module.
*
* @details This function will be called for all events in the Connection Parameters Module which
* are passed to the application.
* @note All this function does is to disconnect. This could have been done by simply
* setting the disconnect_on_fail config parameter, but instead we use the event
* handler mechanism to demonstrate its use.
*
* @param[in] p_evt Event received from the Connection Parameters Module.
*/
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
uint32_t err_code;
if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
{
err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
APP_ERROR_CHECK(err_code);
}
}
/**@brief Function for handling a Connection Parameters error.
*
* @param[in] nrf_error Error code containing information about what went wrong.
*/
static void conn_params_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}
/**@brief Function for initializing the Connection Parameters module.
*/
static void conn_params_init(void)
{
uint32_t err_code;
ble_conn_params_init_t cp_init;
memset(&cp_init, 0, sizeof(cp_init));
cp_init.p_conn_params = NULL;
cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;
cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;
cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
cp_init.disconnect_on_fail = false;
cp_init.evt_handler = on_conn_params_evt;
cp_init.error_handler = conn_params_error_handler;
err_code = ble_conn_params_init(&cp_init);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting timers.
*/
static void application_timers_start(void)
{
/* YOUR_JOB: Start your timers. below is an example of how to start a timer.
uint32_t err_code;
err_code = app_timer_start(m_app_timer_id, TIMER_INTERVAL, NULL);
APP_ERROR_CHECK(err_code); */
// uint32_t err_code=app_timer_start(m_adc_sampling_timer_id,
// ADC_SAMPLING_INTERVAL,
// NULL);
// APP_ERROR_CHECK(err_code);
}
/**@brief Function for putting the chip into sleep mode.
*
* @note This function will not return.
*/
static void sleep_mode_enter(void)
{
uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
APP_ERROR_CHECK(err_code);
// Prepare wakeup buttons.
err_code = bsp_btn_ble_sleep_mode_prepare();
APP_ERROR_CHECK(err_code);
// Go to system-off mode (this function will not return; wakeup will cause a reset).
err_code = sd_power_system_off();
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling advertising events.
*
* @details This function will be called for advertising events which are passed to the application.
*
* @param[in] ble_adv_evt Advertising event.
*/
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
uint32_t err_code;
switch (ble_adv_evt)
{
case BLE_ADV_EVT_FAST:
NRF_LOG_INFO("Fast advertising
");
err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
APP_ERROR_CHECK(err_code);
break;
case BLE_ADV_EVT_IDLE:
sleep_mode_enter();
break;
default:
break;
}
}
/**@brief Function for handling the Application's BLE Stack events.
*
* @param[in] p_ble_evt Bluetooth stack event.
*/
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
uint32_t err_code = NRF_SUCCESS;
switch (p_ble_evt->header.evt_id)
{
case BLE_GAP_EVT_DISCONNECTED:
NRF_LOG_INFO("Disconnected.
");
err_code = bsp_indication_set(BSP_INDICATE_IDLE);
APP_ERROR_CHECK(err_code);
break; // BLE_GAP_EVT_DISCONNECTED
case BLE_GAP_EVT_CONNECTED:
NRF_LOG_INFO("Connected.
");
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
break; // BLE_GAP_EVT_CONNECTED
case BLE_GATTC_EVT_TIMEOUT:
// Disconnect on GATT Client timeout event.
NRF_LOG_DEBUG("GATT Client Timeout.
");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break; // BLE_GATTC_EVT_TIMEOUT
case BLE_GATTS_EVT_TIMEOUT:
// Disconnect on GATT Server timeout event.
NRF_LOG_DEBUG("GATT Server Timeout.
");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break; // BLE_GATTS_EVT_TIMEOUT
case BLE_EVT_USER_MEM_REQUEST:
err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);
APP_ERROR_CHECK(err_code);
break; // BLE_EVT_USER_MEM_REQUEST
case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
{
ble_gatts_evt_rw_authorize_request_t req;
ble_gatts_rw_authorize_reply_params_t auth_reply;
req = p_ble_evt->evt.gatts_evt.params.authorize_request;
if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
{
if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ) ||
(req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||
(req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
{
if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
{
auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
}
else
{
auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
}
auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;
err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,
&auth_reply);
APP_ERROR_CHECK(err_code);
}
}
} break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST
#if (NRF_SD_BLE_API_VERSION == 3)
case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,
NRF_BLE_MAX_MTU_SIZE);
APP_ERROR_CHECK(err_code);
break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
#endif
default:
// No implementation needed.
break;
}
}
/**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
*
* @details This function is called from the BLE Stack event interrupt handler after a BLE stack
* event has been received.
*
* @param[in] p_ble_evt Bluetooth stack event.
*/
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
/** The Connection state module has to be fed BLE events in order to function correctly
* Remember to call ble_conn_state_on_ble_evt before calling any ble_conns_state_* functions. */
ble_conn_state_on_ble_evt(p_ble_evt);
pm_on_ble_evt(p_ble_evt);
ble_conn_params_on_ble_evt(p_ble_evt);
bsp_btn_ble_on_ble_evt(p_ble_evt);
on_ble_evt(p_ble_evt);
ble_advertising_on_ble_evt(p_ble_evt);
ble_nus_on_ble_evt(&m_nus,p_ble_evt); //nus事件处理
/*YOUR_JOB add calls to _on_ble_evt functions from each service your application is using
ble_xxs_on_ble_evt(&m_xxs, p_ble_evt);
ble_yys_on_ble_evt(&m_yys, p_ble_evt);
*/
}
/**@brief Function for dispatching a system event to interested modules.
*
* @details This function is called from the System event interrupt handler after a system
* event has been received.
*
* @param[in] sys_evt System stack event.
*/
static void sys_evt_dispatch(uint32_t sys_evt)
{
// Dispatch the system event to the fstorage module, where it will be
// dispatched to the Flash Data Storage (FDS) module.
fs_sys_event_handler(sys_evt);
// Dispatch to the Advertising module last, since it will check if there are any
// pending flash operations in fstorage. Let fstorage process system events first,
// so that it can report correctly to the Advertising module.
ble_advertising_on_sys_evt(sys_evt);
}
/**@brief Function for initializing the BLE stack.
*
* @details Initializes the SoftDevice and the BLE event interrupt.
*/
static void ble_stack_init(void)
{
uint32_t err_code;
/*************************初始化协议栈处理模块**************************************/
nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
ble_enable_params_t ble_enable_params;
err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
PERIPHERAL_LINK_COUNT,
&ble_enable_params);
APP_ERROR_CHECK(err_code);
/*************************使能协议栈***********************************/
// Check the ram settings against the used number of links
CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT, PERIPHERAL_LINK_COUNT);
// Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
err_code = softdevice_enable(&ble_enable_params);
APP_ERROR_CHECK(err_code);
/****************************注册派发函数**************************************/
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for the Peer Manager initialization.
*
* @param[in] erase_bonds Indicates whether bonding information should be cleared from
* persistent storage during initialization of the Peer Manager.
*/
static void peer_manager_init(bool erase_bonds)
{
ble_gap_sec_params_t sec_param;
ret_code_t err_code;
err_code = pm_init();
APP_ERROR_CHECK(err_code);
if (erase_bonds)
{
err_code = pm_peers_delete();
APP_ERROR_CHECK(err_code);
}
memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));
// Security parameters to be used for all security procedures.
sec_param.bond = SEC_PARAM_BOND;
sec_param.mitm = SEC_PARAM_MITM;
sec_param.lesc = SEC_PARAM_LESC;
sec_param.keypress = SEC_PARAM_KEYPRESS;
sec_param.io_caps = SEC_PARAM_IO_CAPABILITIES;
sec_param.oob = SEC_PARAM_OOB;
sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
sec_param.kdist_own.enc = 1;
sec_param.kdist_own.id = 1;
sec_param.kdist_peer.enc = 1;
sec_param.kdist_peer.id = 1;
err_code = pm_sec_params_set(&sec_param);
APP_ERROR_CHECK(err_code);
err_code = pm_register(pm_evt_handler);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling events from the BSP module.
*
* @param[in] event Event generated when button is pressed.
*/
static void bsp_event_handler(bsp_event_t event)
{
uint32_t err_code;
//判断不同的事件类型,不同的事件类型执行不同的操作
switch (event)
{
case BSP_EVENT_SLEEP:
sleep_mode_enter();
break; // BSP_EVENT_SLEEP
case BSP_EVENT_DISCONNECT:
err_code = sd_ble_gap_disconnect(m_conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
break; // BSP_EVENT_DISCONNECT
//移除广播白名单
case BSP_EVENT_WHITELIST_OFF:
if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
{
err_code = ble_advertising_restart_without_whitelist();
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
}
break; // BSP_EVENT_KEY_0
default:
break;
}
}
/**@brief Function for initializing the Advertising functionality.
*/
static void advertising_init(void)
{
uint32_t err_code;
ble_advdata_t advdata;
ble_adv_modes_config_t options;
// Build advertising data struct to pass into @ref ble_advertising_init.
memset(&advdata, 0, sizeof(advdata));
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = true;
advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
advdata.uuids_complete.p_uuids = m_adv_uuids;
memset(&options, 0, sizeof(options));
options.ble_adv_fast_enabled = true;
options.ble_adv_fast_interval = APP_ADV_INTERVAL;
options.ble_adv_fast_timeout = APP_ADV_TIMEOUT_IN_SECONDS;
err_code = ble_advertising_init(&advdata, NULL, &options, on_adv_evt, NULL);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for initializing buttons and leds.
*
* @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up.
*/
static void buttons_leds_init(bool * p_erase_bonds)
{
bsp_event_t startup_event;
uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),
bsp_event_handler);
APP_ERROR_CHECK(err_code);
err_code = bsp_btn_ble_init(NULL, &startup_event);
APP_ERROR_CHECK(err_code);
*p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}
/**@brief Function for the Power manager.
*/
static void power_manage(void)
{
uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}
//十六进制转字符
uint8_t HexToChar(uint8_t temp)
{
uint8_t dst;
if (temp < 10)
{
dst = temp + '0';
}else
{
dst = temp -10 +'A';
}
return dst;
}
//16进制数组转换为字符串数组
void HexToString(uint8_t *pbDest, uint8_t *pbSrc, uint16_t nLen)
{
uint16_t i;
for (i=0; i<nLen; i++)
{
pbDest[i*2] = HexToChar(pbSrc[i] / 16);
pbDest[i*2+1] = HexToChar(pbSrc[i] % 16);
}
}
//saadc回调函数
void saadc_callback(nrf_drv_saadc_evt_t const *p_event)
{
ret_code_t err_code;
uint8_t adc_result[SAMPLES_IN_BUFFER*2],adc_string[SAMPLES_IN_BUFFER*4];
if(p_event->type == NRF_DRV_SAADC_EVT_DONE)
{
//设置好缓存，为下一次采样做准备
err_code=nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer,
SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
//读取采样结果，使用串口发送
for(uint32_t i=0;i<p_event->data.done.size;i++)
{
adc_result[(i*2)] = p_event->data.done.p_buffer[i] >> 8;
adc_result[(i*2)+1] = p_event->data.done.p_buffer[i];
}
//将采样结果转换为字符串数组，这么做的目的是为了让nRF CONNECT应用能显示出数据，否则直接发送16进制数据的话，显示的是乱码
HexToString(adc_string,adc_result,SAMPLES_IN_BUFFER*2);
//BLE传输的数据长度不能超过20个字节
if(SAMPLES_IN_BUFFER <= 5)
{
//发送数据
ble_nus_string_send(&m_nus, &adc_string[0], SAMPLES_IN_BUFFER*4);
}
}
}
//SAADC初始化函数
void saadc_init(void)
{
ret_code_t err_code;
//定义SAADC采样通道0初始化配置结构体变量,并用默认参数初始化
nrf_saadc_channel_config_t channel_0_config=
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);
channel_0_config.gain=NRF_SAADC_GAIN1_6;
channel_0_config.reference=NRF_SAADC_REFERENCE_INTERNAL; //使用内部的0.6V作为参考电压
//定义SAADC采样通道1初始化配置结构体，并用默认参数初始化
nrf_saadc_channel_config_t channel_1_config=
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);
channel_1_config.gain=NRF_SAADC_GAIN1_6;
channel_1_config.reference=NRF_SAADC_REFERENCE_INTERNAL; //使用内部的0.6V作为参考电压
//定义SAADC采样通道2初始化配置结构体
nrf_saadc_channel_config_t channel_2_config=
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(SAADC_CH_PSELP_PSELP_VDD);
channel_2_config.gain=NRF_SAADC_GAIN1_6;
channel_2_config.reference=NRF_SAADC_REFERENCE_INTERNAL; //使用内部的0.6V作为参考电压
//初始化SAADC
err_code=nrf_drv_saadc_init(NULL,saadc_callback);
APP_ERROR_CHECK(err_code);
//初始化SAADC的通道0
err_code = nrf_drv_saadc_channel_init(0, &channel_0_config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(1, &channel_1_config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(2, &channel_2_config);
APP_ERROR_CHECK(err_code);
//使用双缓存
//设置好第一个缓存
err_code=nrf_drv_saadc_buffer_convert(m_buffer_pool,SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
// //设置好第二个缓存
// err_code=nrf_drv_saadc_buffer_convert(m_buffer_pool[1],SAMPLES_IN_BUFFER);
// APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting advertising.
*/
static void advertising_start(void)
{
uint32_t err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
}
//串口事件回调函数
void uart_event_handle(app_uart_evt_t * p_event)
{
static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
static uint8_t index = 0;
uint32_t err_code;
switch (p_event->evt_type)
{
case APP_UART_DATA_READY: //串口数据接收事件
UNUSED_VARIABLE(app_uart_get(&data_array[index]));
index++;
printf("receive data
");
//判断数据是否接收完成，这里接收完成的标志是"
"或者字节数大于20
if ((data_array[index - 1] == '
') || (index >= (BLE_NUS_MAX_DATA_LEN)))
{
err_code = ble_nus_string_send(&m_nus, data_array, index);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
index = 0;
}
break;
case APP_UART_COMMUNICATION_ERROR: //通讯错误事件
APP_ERROR_HANDLER(p_event->data.error_communication);
break;
case APP_UART_FIFO_ERROR: //FIFO错误事件
APP_ERROR_HANDLER(p_event->data.error_code);
break;
default:
break;
}
}
//串口初始化程序
static void uart_init()
{
uint32_t err_code;
const app_uart_comm_params_t comm_params =
{
RX_PIN_NUMBER,
TX_PIN_NUMBER,
RTS_PIN_NUMBER,
CTS_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED,
false,
UART_BAUDRATE_BAUDRATE_Baud115200
};
APP_UART_FIFO_INIT( &comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_event_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);
APP_ERROR_CHECK(err_code);
}
//定时器2初始化函数
static void timers2_init()
{
uint32_t time_ms=1000;
uint32_t time_ticks=0;
uint32_t err_code=NRF_SUCCESS;
//定义定时器配置结构体，并使用默认配置参数初始化结构体
nrf_drv_timer_config_t timer_cfg=NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_31250Hz;
//初始化定时器，初始化时会注册事件回调函数
err_code=nrf_drv_timer_init(&m_timer,&timer_cfg,saadc_sampling_timeout_handler);
APP_ERROR_CHECK(err_code);
//定时时间ms转化为ticks
time_ticks=nrf_drv_timer_ms_to_ticks(&m_timer,time_ms);
//设置定时器捕获/比较通道及该通道的比较值，使能通道的比较中断
nrf_drv_timer_extended_compare(&m_timer,NRF_TIMER_CC_CHANNEL0,time_ticks,
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,true);
//启动定时器
nrf_drv_timer_enable(&m_timer);
}
//PPI初始化函数
void ppi_config(void)
{
uint32_t err_code=NRF_SUCCESS;
//初始化PPI程序模块
err_code=nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
//分配PPI通道，注意PPI的通道分配是驱动函数完成的，分配的通道号保存到my_ppi_channel
err_code=nrf_drv_ppi_channel_alloc(&my_ppi_channel);
APP_ERROR_CHECK(err_code);
//分配PPI通道的EEP和TEP
err_code=nrf_drv_ppi_channel_assign(my_ppi_channel,
nrf_drv_timer_compare_event_address_get(&m_timer, NRF_TIMER_CC_CHANNEL0),
nrf_drv_saadc_sample_task_get());
APP_ERROR_CHECK(err_code);
//使能PPI通道
err_code=nrf_drv_ppi_channel_enable(my_ppi_channel);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for application main entry.
*/
int main(void)
{
uint32_t err_code;
bool erase_bonds;
// Initialize.
err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
uart_init(); //串口初始化程序
timers_init();//定时器初始化
timers2_init(); //定时器2初始化
buttons_leds_init(&erase_bonds);//板卡外设的初始化
ble_stack_init();
peer_manager_init(erase_bonds);//配对管理器
if (erase_bonds == true)
{
NRF_LOG_INFO("Bonds erased!
");
}
gap_params_init(); //GAP层初始化
advertising_init(); //广播配置
services_init();
conn_params_init();
// Start execution.
NRF_LOG_INFO("Template started
");
saadc_init(); //SAADC初始化函数
application_timers_start(); //开始定时器
err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
ppi_config();
// Enter main loop.
for (;;)
{
if (NRF_LOG_PROCESS() == false)
{
power_manage();
}
}
}
/**
* @}
*/
注意
1 设置的定时时间不要超过定时器的最大定时时间，如果超过最大定时时间，可以修改定时器的频率，如下这行语句修改了定时器的频率
timer_cfg.frequency = NRF_TIMER_FREQ_31250Hz;
2 定时器初始化时
nrf_drv_timer_config_t timer_cfg=NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency=NRF_TIMER_FREQ_31250Hz;
其中NRF_DRV_TIMER_DEFAULT_CONFIG宏用来初始化定时器，可以查看一下该宏的定义
#define NRF_DRV_TIMER_DEFAULT_CONFIG
{
.frequency = (nrf_timer_frequency_t)TIMER_DEFAULT_CONFIG_FREQUENCY,
.mode = (nrf_timer_mode_t)TIMER_DEFAULT_CONFIG_MODE,
.bit_width = (nrf_timer_bit_width_t)TIMER_DEFAULT_CONFIG_BIT_WIDTH,
.interrupt_priority = TIMER_DEFAULT_CONFIG_IRQ_PRIORITY,
.p_context = NULL
}
在NRF_DRV_TIMER_DEFAULT_CONFIG宏中初始化了Timer的时钟频率，Timer的工作模式(定时或计数)，Timer的位宽，Timer的中断优先级等。以位宽为例，TIMER_DEFAULT_CONFIG_BIT_WIDTH的定义可以在sdk_config.h中查看到。
// <o> TIMER_DEFAULT_CONFIG_BIT_WIDTH - Timer counter bit width
// <0=> 16 bit
// <1=> 8 bit
// <2=> 24 bit
// <3=> 32 bit
#ifndef TIMER_DEFAULT_CONFIG_BIT_WIDTH
#define TIMER_DEFAULT_CONFIG_BIT_WIDTH 0
#endif
Timer的位宽可以设置为16bit，8bit，24bit，32bit。
参考资料
1 nRF52832 API
2 艾克姆科技资料