基本信息
源码名称：nrf51822 PPI开发demo
源码大小：0.58M
文件格式：.zip
开发语言：C/C++
更新时间：2019-07-18
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源码介绍
/****************************************Copyright (c)****************************************************
**
** [艾克姆科技]
** IIKMSIK
**--------------File Info---------------------------------------------------------------------------------
** File name: main.c
** Last modified Date:
** Last Version:
** Descriptions: 使用的SDK版本-SDK_11.0.0
**
**--------------------------------------------------------------------------------------------------------
** Created by: FiYu
** Created date: 2016-5-19
** Version: 1.0
** Descriptions: UART控制指示灯实验
**--------------------------------------------------------------------------------------------------------*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "boards.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
/* 开发板中LED和串口占用的nRF51822管脚资源
P0.21：输出：驱动指示灯D1
P0.22：输出：驱动指示灯D2
P0.23：输出：驱动指示灯D3
P0.24：输出：驱动指示灯D4
P0.09：UART_TXD ：串口发送
P0.11：UART_RXD ：串口接收
P0.08：UART_CTS
P0.10：UART_RTS
需要短接对应的跳线帽
*/
#define UART_TX_BUF_SIZE 256 /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 1 /**< UART RX buffer size. */
const nrf_drv_timer_t timer0 = NRF_DRV_TIMER_INSTANCE(0);
const nrf_drv_timer_t timer1 = NRF_DRV_TIMER_INSTANCE(1);
const nrf_drv_timer_t timer2 = NRF_DRV_TIMER_INSTANCE(2);
nrf_ppi_channel_t ppi_channel1, ppi_channel2;
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);
}
}
// Timer even handler. Not used since timer is used only for PPI.
void timer_event_handler(nrf_timer_event_t event_type, void * p_context){}
/** @brief Function for initializing the PPI peripheral.
*/
static void ppi_init(void)
{
uint32_t err_code = NRF_SUCCESS;
err_code = nrf_drv_ppi_init();//初始化PPI。检查PPI模块是否已经被初始化，若未初始化，将初始化标志置位
APP_ERROR_CHECK(err_code);
// 配置第一个PPI通道(本实验中使用了2个PPI通道)TIMER1 COMPARE[0]匹配事件作为事件端点触发TIMER0计数器的STOP Task(任务端点)
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel1);//分配PPI通道，成功分配通道后，ppi_channel1指向被分配的通道
APP_ERROR_CHECK(err_code);
// 设置通道的事件端点和任务端点
err_code = nrf_drv_ppi_channel_assign(ppi_channel1,
nrf_drv_timer_event_address_get(&timer1, NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&timer0, NRF_TIMER_TASK_STOP));
APP_ERROR_CHECK(err_code);
// 配置第二个PPI通道(本实验中使用了2个PPI通道)TIMER2 COMPARE[0]匹配事件作为事件端点触发TIMER0计数器的START Task(任务端点)
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel2);//分配PPI通道，成功分配通道后，ppi_channel2指向被分配的通道
APP_ERROR_CHECK(err_code);
// 设置通道的事件端点和任务端点
err_code = nrf_drv_ppi_channel_assign(ppi_channel2,
nrf_drv_timer_event_address_get(&timer2, NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&timer0, NRF_TIMER_TASK_START));
APP_ERROR_CHECK(err_code);
// 使能两个已经配置了事件端点和任务端点的PPI通道
err_code = nrf_drv_ppi_channel_enable(ppi_channel1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_enable(ppi_channel2);
APP_ERROR_CHECK(err_code);
}
/** @brief Function for Timer 0 initialization, which will be started and stopped by timer1 and timer2 using PPI.
*/
static void timer0_init(void)
{
ret_code_t err_code = nrf_drv_timer_init(&timer0, NULL, timer_event_handler);
APP_ERROR_CHECK(err_code);
}
/** @brief Function for Timer 1 initialization.
* @details Initializes Timer 1 peripheral, creates event and interrupt every 2 seconds,
* by configuring CC[0] to timer overflow value, we create events at even number of seconds
* for example, events are created at 2,4,6 ... seconds. This event can be used to stop Timer 0
* with Timer1->Event_Compare[0] triggering Timer 0 TASK_STOP through PPI.
*/
static void timer1_init(void)
{
// Configure Timer 1 to overflow every 2 seconds. Check TIMER1 configuration for details
// The overflow occurs every 0xFFFF/(SysClk/2^PRESCALER).
// = 65535/31250 = 2.097 sec
ret_code_t err_code = nrf_drv_timer_init(&timer1, NULL, timer_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&timer1, NRF_TIMER_CC_CHANNEL0, 0xFFFFUL, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, false);
}
/** @brief Function for Timer 2 initialization.
* @details Initializes Timer 2 peripheral, creates event and interrupt every 2 seconds
* by configuring CC[0] to half of timer overflow value. Events are created at odd number of seconds.
* For example, events are created at 1,3,5,... seconds. This event can be used to start Timer 0
* with Timer2->Event_Compare[0] triggering Timer 0 TASK_START through PPI.
*/
static void timer2_init(void)
{
// Generate interrupt/event when half of time before the timer overflows has past, that is at 1,3,5,7... seconds from start.
// Check TIMER1 configuration for details
// now the overflow occurs every 0xFFFF/(SysClk/2^PRESCALER)
// = 65535/31250 = 2.097 sec */
ret_code_t err_code = nrf_drv_timer_init(&timer2, NULL, timer_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&timer2, NRF_TIMER_CC_CHANNEL0, 0x7FFFUL, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, false);
}
//串口初始化
void uart_init(void)
{
uint32_t err_code;
//配置串口
const app_uart_comm_params_t comm_params =
{
RX_PIN_NUMBER, //设置UART的管脚
TX_PIN_NUMBER,
RTS_PIN_NUMBER,
CTS_PIN_NUMBER,
APP_UART_FLOW_CONTROL_DISABLED, //关闭流控
false,
UART_BAUDRATE_BAUDRATE_Baud115200 //设置波特率为115200
};
APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_error_handle,
APP_IRQ_PRIORITY_LOW,
err_code);
APP_ERROR_CHECK(err_code);
}
/**********************************************************************************************
* 描 述 : main函数
* 入 参 : 无
* 返回值 : 无
***********************************************************************************************/
int main(void)
{
LEDS_CONFIGURE(LEDS_MASK); //配置驱动LED指示灯的管脚
LEDS_OFF(LEDS_MASK); //关闭所有指示灯
timer0_init(); // 初始化Timer0用作计数器
timer1_init(); // 初始化Timer1用作定时器，偶数秒产生匹配事件
timer2_init(); // 初始化Timer2用作定时器，奇数秒产生匹配事件
ppi_init(); // 初始化PPI
uart_init(); //初始化串口。波特率115200，流控关闭
// Enabling constant latency as indicated by PAN 11 "HFCLK: Base current with HFCLK
// running is too high" found at Product Anomaly document found at
// https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads
//
// @note This example does not go to low power mode therefore constant latency is not needed.
// However this setting will ensure correct behaviour when routing TIMER events through
// PPI (shown in this example) and low power mode simultaneously.
NRF_POWER->TASKS_CONSTLAT = 1;
// Start clock.
nrf_drv_timer_enable(&timer0);//使能Timer0
nrf_drv_timer_enable(&timer1);//使能Timer1
nrf_drv_timer_enable(&timer2);//使能Timer2
while (true)
{
printf("Current count: %d\r\n", (int)nrf_drv_timer_capture(&timer0,NRF_TIMER_CC_CHANNEL0));//打印出Timer0计数值
nrf_drv_timer_increment(&timer0);//计数器Timer0计数值加1
nrf_delay_ms(100);
nrf_gpio_pin_toggle(LED_1);//翻转指示灯D1的状态，用于指示程序的运行
}
}
/********************************************END FILE*******************************************/