스마트홈
[Firmware] M058 - PWM
hyeok0724.kim@gmail.com
2019. 5. 3. 16:03
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[설명]
- pin24에 LED를 연결함
- PWM0 ~ PWM7 이 존재함
- 2개씩 묶어서 PWM0, PWM1 은 channel10, PWM2, PWM3은 channel11 으로 관리함
- PWMA -> PWM0 ~ PWM3, PWMB -> PWM4 ~ PWM7 로 관리됨
- PWMA의 0번은 PWM0 이고 PWMB의 0번은 PWM4 를 가르킴
- 기본적으로 PWM_ConfigOutputChannel 함수의 맨 끝에 60 값 바꾸면 조절됨
[기본코드]
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#include <stdio.h>
#include "M051Series.h"
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable PLL and Set PLL frequency */
CLK_SetCoreClock(PLLCON_SETTING);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));
/* Enable PWM module clock */
CLK_EnableModuleClock(PWM45_MODULE);
/* Select PWM module clock source */
CLK_SetModuleClock(PWM23_MODULE, CLK_CLKSEL2_PWM45_S_HXT, 0);
/* Reset PWMB channel0~channel3 */
SYS_ResetModule(PWM47_RST);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
//SystemCoreClockUpdate();
PllClock = PLL_CLOCK; // PLL
SystemCoreClock = PLL_CLOCK / 1; // HCLK
CyclesPerUs = PLL_CLOCK / 1000000; // For SYS_SysTickDelay()
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P4 multi-function pins for PWMB Channel2 */
SYS->P2_MFP = SYS_MFP_P24_PWM4;
}
int main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Enable PWM Output pin */
PWM_EnableOutput(PWMB, 0x0);
PWM_ConfigOutputChannel(PWMB, PWM_CH0, 10000, 60);
/* Enable PWM Timer */
PWM_Start(PWMB, 0x0);
/* Wait until PWMB channel 0 Timer Stop */
while(PWMB->PDR0 != 0);
/* Disable the PWM Timer */
PWM_Stop(PWMB, 0x0);
/* Disable PWM Output pin */
PWM_DisableOutput(PWMB, 0x0);
}
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