本帖最后由 Swallow_0322 于 2011-4-10 08:19 编辑
菜鸟**下自己的学习历程,希望各位高手不吝赐教!
PWM0输出波形配置步骤:
① 使能PWM时钟:对任何关于PWM的操作均需调用该函数,DrvPWM_Open();
② 选择PWM0时钟源(该例程选择外部12MHZ):DrvPWM_SelectClockSource(DRVPWM_TIMER0, DRVPWM_EXT_12M);
③ 配置PWM Timer0:(包括对预分频寄存器、控制寄存器、计数器寄存器、比较寄存器)DrvPWM_SetTimerClk(DRVPWM_TIMER0, &sPt);
④ 配置PWM输出使能 (POE):DrvPWM_SetTimerIO(DRVPWM_TIMER0, 1);
⑤ 配置相应的管脚GPIO (GPA_MFP):DrvGPIO_InitFunction(E_FUNC_PWM01);
⑥ 使能PWM定时器(PCR) :DrvPWM_Enable(DRVPWM_TIMER0, 1);
手册对PWM描述摘录:
源程序如下:
/**************************************************
** 文件名称:NUC120_HOT_PWM.c
** 文件说明:NUC120助学板练习程序
** 创建日期:2011-04-09
** 修改日期:
** 备 注:PWM0输出波形测试,频率为400HZ,初始占空比为50%,可通过串口输入0~9调整占空比
**************************************************/
#include <stdio.h>
#include "NUC1xx.h"
#include "Driver\DrvGPIO.h"
#include "Driver\DrvSYS.h"
#include "Driver\DrvUART.h"
#include "Driver\DrvTIMER.h"
#include "Driver\DrvPWM.h"
#define Run_Led 2 //2----LED1 3----LED2 4----LED3 5----LED4
volatile uint8_t PWM0_Duty_Cycle = 50; //PWM占空比
/***************
** 函数声明 **
***************/
void Init_System (void);
void Init_Uart (void);
void Init_PWM0(void);
void UART_INT_HANDLE(uint32_t u32IntStatus);
/*****************************
** Name: UART_INT_HANDLE
** Function: UART Callback function
** Input: u32IntStatus
** OutPut: None
** Data: 2011-03-17
** Note:
****************************/
void UART_INT_HANDLE(uint32_t u32IntStatus)
{
uint8_t bInChar[1]={0xFF};
if(u32IntStatus & DRVUART_RDAINT)
{
/* Get all the input characters */
while(UART0->ISR.RDA_IF==1)
{
/* Get the character from UART Buffer */
DrvUART_Read(UART_PORT0,bInChar,1);
if ((bInChar[0]<='9')&&(bInChar[0]>='0'))
{
PWM0_Duty_Cycle= (bInChar[0]-0x30)*10;
printf("您输入的占空比为:%d:100.\n",PWM0_Duty_Cycle);
}
else
printf("您的输入有误!\n");
}
}
}
/*****************************
** Name: Init_System
** Function: 系统初始化函数
** Input: None
** OutPut: None
** Data: 2011-03-17
** Note:
****************************/
void Init_System(void)
{
/* Unlock the locked registers before access */
UNLOCKREG(x); //寄存器锁定键地址寄存器(RegLockAddr) :有些系统控制寄存器需要被保护起来,以防止误操作而影响芯片运行,
//这些寄存器在上电复位到用户解锁定之前是锁定的。用户可以连续依次写入“59h”, “16h” “88h”到0x5000_0100解锁定.
/* Enable the 12MHz oscillator oscillation */
DrvSYS_SetOscCtrl(E_SYS_XTL12M, 1); //SYSCLK->WRCON.XTL12M_EN = 1;
/* Waiting for 12M Xtal stable */
//while (DrvSYS_GetChipClockSourceStatus(E_SYS_XTL12M) != 1); //SYSCLK->CLKSTATUS.XTL12M_STB
/*eClkSrc - [in] E_SYS_XTL12M / E_SYS_XTL32K / E_SYS_OSC22M / E_SYS_OSC10K / E_SYS_PLL */
// Note: Only some of NuMicro NUC100 Series support this function.
DrvSYS_Delay(5000);
LOCKREG(x);
//向“0x5000_0100”写入任何值,就可以重锁保护寄存器
}
/*****************************
** Name: Init_Uart
** Function: UART初始化函数
** Input: None
** OutPut: None
** Data: 2011-03-17
** Note:
****************************/
void Init_Uart(void)
{
STR_UART_T param;
/*
声明 UART设置的结构体 位于DRVUART.H
结构体如下
typedef struct DRVUART_STRUCT
{
uint32_t u32BaudRate;
E_DATABITS_SETTINS u8cDataBits;
E_STOPBITS_SETTINS u8cStopBits;
E_PARITY_SETTINS u8cParity;
E_FIFO_SETTINGS u8cRxTriggerLevel;
uint8_t u8TimeOut ;
}STR_UART_T;
*/
DrvSYS_SelectIPClockSource(E_SYS_UART_CLKSRC,0); //使能UART时钟
//SYSCLK->CLKSEL1.UART_S = 0; //UART时钟源选择. 00 =外部12MHz 晶振 01 = PLL 1x =内部 22MHz 振荡器
DrvGPIO_InitFunction(E_FUNC_UART0); //GPB_MFP0-1-2-3置位 GPIO使能UART功能
//outpw(&SYS->GPBMFP, inpw(&SYS->GPBMFP) | (0xF<<0));
param.u32BaudRate = 115200; // 波特率
param.u8cDataBits = DRVUART_DATABITS_8; // 数据位
param.u8cStopBits = DRVUART_STOPBITS_1; // 停止位
param.u8cParity = DRVUART_PARITY_NONE; // 校验位
param.u8cRxTriggerLevel = DRVUART_FIFO_1BYTES; // FIFO存储深度 1 字节
param.u8TimeOut = 0; // FIFO超时设定
/* Set UART Configuration */
if(DrvUART_Open(UART_PORT0,¶m) != E_SUCCESS) // 串口开启、结构体整体赋值
printf("UART0 open failed\n");
/* u32Port -[in] UART Channel: UART_PORT0 / UART_PORT1 /UART_PORT2 */
/* sParam -[in] the struct parameter to configure UART */
/* Enable Interrupt and install the call back function */
DrvUART_EnableInt(UART_PORT0, DRVUART_RDAINT,UART_INT_HANDLE);
/*u32Port -[in] UART Channel: UART_PORT0 / UART_PORT1 / UART_PORT2 */
/*u32InterruptFlag -[in] DRVUART_LININT/DRVUART_WAKEUPINT/DRVUART_BUFERRINT/DRVUART_RLSINT */
/* DRVUART_MOSINT/DRVUART_THREINT/DRVUART_RDAINT/DRVUART_TOUTINT */
/*pfncallback -[in] A function pointer for callback function */
}
/*****************************
** Name: Init_PWM0
** Function: Timer0初始化函数
** Input: None
** OutPut: None
** Data: 2011-04-09
** Note:
****************************/
void Init_PWM0(void)
{
S_DRVPWM_TIME_DATA_T sPt;
/*
声明 PWM Timer设置的结构体 位于DRVPWM.H
结构体如下:
typedef struct
{
uint8_t u8Mode;
uint8_t u8HighPulseRatio;
uint8_t u8ClockSelector;
uint8_t u8PreScale;
uint32_t u32Frequency;
uint32_t u32Duty;
int32_t i32Inverter;
}S_DRVPWM_TIME_DATA_T;
*/
/* PWM Timer property */
sPt.u8Mode = DRVPWM_AUTO_RELOAD_MODE; /*自动重载模式 DRVPWM_ONE_SHOT_MODE为单触发模式*/
sPt.u32Frequency = 400; /*PWM 频率 为400HZ即2500us为一周期*/
sPt.u8HighPulseRatio = PWM0_Duty_Cycle; /* 高脉冲宽度 : 总脉冲宽度 = 1 : 100 */
sPt.i32Inverter = 0; /*反向关闭*/
/* Enable PWM clock */
DrvPWM_Open();
/* Select PWM engine clock */
DrvPWM_SelectClockSource(DRVPWM_TIMER0, DRVPWM_EXT_12M);
/* Set PWM Timer0 Configuration */
DrvPWM_SetTimerClk(DRVPWM_TIMER0, &sPt);
/* Enable Output for PWM Timer0 */
DrvPWM_SetTimerIO(DRVPWM_TIMER0, 1);
/* Set PWM pins */
DrvGPIO_InitFunction(E_FUNC_PWM01);
/* Enable the PWM Timer 0 */
DrvPWM_Enable(DRVPWM_TIMER0, 1);
}
int main (void)
{
uint8_t test = 250;
uint8_t PWM0_Duty_Cycle_tmp = 50;
uint16_t PWM_CNR0_tmp = 0;
uint16_t tmp;
Init_System();
Init_Uart();
Init_PWM0();
DrvGPIO_Open(E_GPA,Run_Led, E_IO_OUTPUT); //程序运行指示
DrvGPIO_ClrBit(E_GPA,Run_Led);
printf("\n");
printf("/*==========================\n");
printf("======菜农 %d 助学计划======\n",test);
printf("========NUC120助学板========\n");
printf("======程序参考新唐BSP库======\n");
printf("=======2010年04月09日=======\n");
printf("=========PWM实验=========\n");
printf("WM基本配置如下:\n");
printf("WMA 预分频为:0x%x\n",PWMA->PR.CP01);
printf("WMA 时钟选择寄存器:0x%x\n",PWMA->CSR.CSR0);
PWM_CNR0_tmp = PWMA->CNR0;
printf("WM 计数器寄存器CNR0: 0x%x\n",PWM_CNR0_tmp);
printf("WM 比较寄存器 CMR0: 0x%x\n", PWMA->CMR0);
printf("请输入0~9(占空比*10/100)调整占空比开始测试!\n");
printf("==========================*/\n");
while(1)
{
if (PWM0_Duty_Cycle_tmp!=PWM0_Duty_Cycle)
{
//更改CMR0 调整PWM0输出占空比
PWM0_Duty_Cycle_tmp = PWM0_Duty_Cycle;
if (0==PWM0_Duty_Cycle)
{
PWMA->CMR0 = 0;
}
else
{
tmp = (PWM_CNR0_tmp+1)*PWM0_Duty_Cycle/100-1;
PWMA->CMR0 = tmp;
}
}
}
}
工程结构:
串口调试助手截图:
初始占空比为50%时 GPA.12波形图:
串口发送‘8’时 GPA.12波形图:
串口发送‘6时 GPA.12波形图:
串口发送‘4’时 GPA.12波形图:
串口发送‘2’时 GPA.12波形图:
工程文件:
NUC120_HOT_PWM.rar
(1.58 MB)
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