3-uart 示例
1.关键文件
1.1 nrf52811.h
芯片寄存器定义
nRF5_SDK_17.1.0_ddde560\\modules\\nrfx\\mdk\\nrf52811.h
1.2nrf52811_bitfields.h
nRF5_SDK_17.1.0_ddde560\\modules\\nrfx\\mdk\\nrf52811_bitfields.h
1.3nrfx_common.h
nRF5_SDK_17.1.0_ddde560\\modules\\nrfx\\drivers\\nrfx_common.h
1.4PCA10040.h
目标板管脚定义
nRF5_SDK_17.1.0_ddde560\\components\\boards\\PCA10040.h
1.5nrf_uart.h
串口寄存器操作
NnRF5_SDK_17.1.0_ddde560\\modules\\nrfx\\hal\\nrf_uart.h
1.6nrfx_uart.c
uart驱动,调用nrf_uart.h
nRF5_SDK_17.1.0_ddde560\\modules\\nrfx\\drivers\\src\\nrfx_uart.c
1.7nrf_drv_uart.h/nrf_drv_uart.c(legacy)
nRF5_SDK_17.1.0_ddde560\\integration\\nrfx\\legacy\\nrf_drv_uart.h
SDK\\nRF5_SDK_17.1.0_ddde560\\integration\\nrfx\\legacy\\nrf_drv_uart.c
1.8app_uart.h
nRF5_SDK_17.1.0_ddde560\\components\\libraries\\uart\\app_uart.h
2.示例
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif
//#define ENABLE_LOOPBACK_TEST /**< if defined, then this example will be a loopback test, which means that TX should be connected to RX to get data loopback. */
#define MAX_TEST_DATA_BYTES (15U) /**< max number of test bytes to be used for tx and rx. */
#define UART_TX_BUF_SIZE 256 /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256 /**< UART RX buffer size. */
#define UART_BUFFER_SIZE 256
static uint8_t m_uart_buffer[UART_BUFFER_SIZE];
static uint8_t m_rx_data;
static uint8_t m_rx_index = 0;
static void uart_event_handler(app_uart_evt_t *p_event)
{
switch (p_event->evt_type)
{
case APP_UART_DATA_READY:
while (app_uart_get(&m_rx_data) == NRF_SUCCESS)
{
if (m_rx_data == '\\r' || m_rx_data == '\\n')
{
m_uart_buffer[m_rx_index] = '\\0';
//NRF_LOG_INFO("Received data: %s", m_uart_buffer);
//printf("\\r\\nrecv data:%s\\r\\n",m_uart_buffer);
m_rx_index = 0;
}
else if (m_rx_index < UART_BUFFER_SIZE - 1)
{
m_uart_buffer[m_rx_index++] = m_rx_data;
}
}
break;
case APP_UART_COMMUNICATION_ERROR:
//NRF_LOG_ERROR("Communication error occurred");
APP_ERROR_HANDLER(p_event->data.error_communication);
break;
case APP_UART_FIFO_ERROR:
//NRF_LOG_ERROR("FIFO error occurred");
APP_ERROR_HANDLER(p_event->data.error_code);
break;
default:
break;
}
}
# if 0
static uint8_t m_uart_buffer[UART_BUFFER_SIZE];
static uint8_t m_rx_data;
static uint8_t m_rx_index = 0;
void uart_error_handle(app_uart_evt_t * p_event)
{
if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
{
APP_ERROR_HANDLER(p_event->data.error_communication);
}
else if (p_event->evt_type == APP_UART_FIFO_ERROR)
{
APP_ERROR_HANDLER(p_event->data.error_code);
}
else if(p_event->evt_type == APP_UART_DATA_READY)
{
UNUSED_VARIABLE(app_uart_get(&data_recv[index]));
index++;
if((data_recv[index-1]=='\\n')||(data_recv[index-1]=='\\r')||(index>=255))
{
if(index>1)
{
printf("\\r\\nrecv data:%s\\r\\n",data_recv);
}
index=0;
data_recv[0]='\\n';
//memset(data_recv,0,sizeof(data_recv));
}
}
}
#endif
#ifdef ENABLE_LOOPBACK_TEST
/* Use flow control in loopback test. */
#define UART_HWFC APP_UART_FLOW_CONTROL_ENABLED
/** @brief Function for setting the @ref ERROR_PIN high, and then enter an infinite loop.
*/
static void show_error(void)
{
bsp_board_leds_on();
while (true)
{
// Do nothing.
}
}
/** @brief Function for testing UART loop back.
* @details Transmitts one character at a time to check if the data received from the loopback is same as the transmitted data.
* @note @ref TX_PIN_NUMBER must be connected to @ref RX_PIN_NUMBER)
*/
static void uart_loopback_test()
{
uint8_t * tx_data = (uint8_t *)("\\r\\nLOOPBACK_TEST\\r\\n");
uint8_t rx_data;
// Start sending one byte and see if you get the same
for (uint32_t i = 0; i < MAX_TEST_DATA_BYTES; i++)
{
uint32_t err_code;
while (app_uart_put(tx_data[i]) != NRF_SUCCESS);
nrf_delay_ms(10);
err_code = app_uart_get(&rx_data);
if ((rx_data != tx_data[i]) || (err_code != NRF_SUCCESS))
{
show_error();
}
}
return;
}
#else
/* When UART is used for communication with the host do not use flow control.*/
#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED
#endif
/**
* @brief Function for main application entry.
*/
int main(void)
{
uint32_t err_code;
bsp_board_init(BSP_INIT_LEDS);
const app_uart_comm_params_t comm_params =
{
RX_PIN_NUMBER,
TX_PIN_NUMBER,
RTS_PIN_NUMBER,
CTS_PIN_NUMBER,
UART_HWFC,
false,
#if defined (UART_PRESENT)
NRF_UART_BAUDRATE_115200
#else
NRF_UARTE_BAUDRATE_115200
#endif
};
APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_event_handler,
APP_IRQ_PRIORITY_LOWEST,
err_code);
APP_ERROR_CHECK(err_code);
#ifndef ENABLE_LOOPBACK_TEST
printf("\\r\\nUART example started.\\r\\n");
while (true)
{
uint8_t cr;
while (app_uart_get(&cr) != NRF_SUCCESS);
while (app_uart_put(cr) != NRF_SUCCESS);
if (cr == 'q' || cr == 'Q')
{
printf(" \\r\\nExit!\\r\\n");
while (true)
{
// Do nothing.
}
}
}
#else
// This part of the example is just for testing the loopback .
while (true)
{
uart_loopback_test();
}
#endif
}