nrf52官方串口例程

最新推荐文章于 2025-05-13 10:02:31 发布

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nrf52开发板拿到手快半年了，之前只跑过一次官方例程，然后就放一边了，现在准备学习一下，首先从串口开始。

串口例程有两个，这里直接使用ble_app_uart这个例程，这是基于ble的例程，可以通过ble主机和开发版进行通讯，收发数据通过串口实现。

看了初始化函数，知道了默认波特率是38400,（可以通过修改宏改变波特率），然后将例程编译烧录，例程跑起来了，但是串口助手却没有输出任何数据，很奇怪，于是开关串口助手，偶尔会打印出来一个字符，不知道哪里的问题，于是换了一个串口助手，还是一样，拿手机可以连接ble，并且单步调试也是可以运行的，一时不知道怎么回事了，于是在网上找资料，看到一篇51串口讲解的，串口配置图都有，对比了一下，发下里面还配置了串口中断超时100ms，以前从来没有调过这个参数，然后找到自己助手里有读间隔超时1ms，改为100ms，奇迹出现了，串口好了（自己已经改了波特率115200了），这个问题是字符传输间隔时间过程导致了超时。

串口通了，可以继续学习nrf52了

将uart添加到其它工程非常方便，当然下面这样操作是不推荐的，最快捷添加uart的方式是直接往main函数上面添加如下代码：

struct ble_nus_s;

/* Forward declaration of the ble_nus_t type. */
typedef struct ble_nus_s ble_nus_t;

/**@brief Nordic UART Service event handler type. */
typedef void (*ble_nus_data_handler_t) (ble_nus_t * p_nus, uint8_t * p_data, uint16_t length);

struct ble_nus_s
{
uint8_t uuid_type; /**< UUID type for Nordic UART Service Base UUID. */
uint16_t service_handle; /**< Handle of Nordic UART Service (as provided by the S110 SoftDevice). */
ble_gatts_char_handles_t tx_handles; /**< Handles related to the TX characteristic (as provided by the S110 SoftDevice). */
ble_gatts_char_handles_t rx_handles; /**< Handles related to the RX characteristic (as provided by the S110 SoftDevice). */
uint16_t conn_handle; /**< Handle of the current connection (as provided by the S110 SoftDevice). BLE_CONN_HANDLE_INVALID if not in a connection. */
bool is_notification_enabled; /**< Variable to indicate if the peer has enabled notification of the RX characteristic.*/
ble_nus_data_handler_t data_handler; /**< Event handler to be called for handling received data. */
};

/* Forward declaration of the ble_nus_t type. */
typedef struct ble_nus_s ble_nus_t;

#define BLE_UUID_NUS_SERVICE 0x0001 /**< The UUID of the Nordic UART Service. */
#define BLE_NUS_MAX_DATA_LEN (GATT_MTU_SIZE_DEFAULT - 3) /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */

static ble_nus_t m_nus; /**< Structure to identify the Nordic UART Service. */

/**@brief Function for handling app_uart events.
*
* @details This function will receive a single character from the app_uart module and append it to
* a string. The string will be be sent over BLE when the last character received was a
* 'new line' i.e '\n' (hex 0x0D) or if the string has reached a length of
* @ref NUS_MAX_DATA_LENGTH.
*/
/**@snippet [Handling the data received over UART] */
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:
UNUSED_VARIABLE(app_uart_get(&data_array[index]));
index++;

if ((data_array[index - 1] == '\n') || (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:
APP_ERROR_HANDLER(p_event->data.error_communication);
break;

case APP_UART_FIFO_ERROR:
APP_ERROR_HANDLER(p_event->data.error_code);
break;

default:
break;
}
}
/**@snippet [Handling the data received over UART] */

/**@brief Function for initializing the UART module.
*/
/**@snippet [UART Initialization] */
static void uart_init(void)
{
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_ENABLED,
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_LOW,
err_code);
APP_ERROR_CHECK(err_code);
}
/**@snippet [UART Initialization] */

/**@brief Function for application main entry.
*/
int main(void)
{
bool erase_bonds;
uint32_t err_code;

// Initialize.
app_trace_init();
timers_init();
buttons_leds_init(&erase_bonds);
ble_stack_init();
scheduler_init();
device_manager_init(erase_bonds);
gap_params_init();
advertising_init();
services_init();
sensor_simulator_init();
conn_params_init();
buffer_init();
//add by allen
uart_init();

// Start execution.
timers_start();
err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
printf("hello nordic...\n");
// Enter main loop.
for (;;)
{
app_sched_execute();
power_manage();
}
}

/**
* @}
*/