NRF52832 PWM

1.在sdk_config.h中加入宏

// PWM_ENABLED - nrf_drv_pwm - PWM peripheral driver - legacy layer //========================================================== #ifndef PWM_ENABLED #define PWM_ENABLED 1 #endif // PWM_DEFAULT_CONFIG_OUT0_PIN - Out0 pin   

#ifndef PWM_DEFAULT_CONFIG_OUT0_PIN #define PWM_DEFAULT_CONFIG_OUT0_PIN 31 #endif

// PWM_DEFAULT_CONFIG_OUT1_PIN - Out1 pin   

#ifndef PWM_DEFAULT_CONFIG_OUT1_PIN #define PWM_DEFAULT_CONFIG_OUT1_PIN 31 #endif

// PWM_DEFAULT_CONFIG_OUT2_PIN - Out2 pin   

#ifndef PWM_DEFAULT_CONFIG_OUT2_PIN #define PWM_DEFAULT_CONFIG_OUT2_PIN 31 #endif

// PWM_DEFAULT_CONFIG_OUT3_PIN - Out3 pin   

#ifndef PWM_DEFAULT_CONFIG_OUT3_PIN #define PWM_DEFAULT_CONFIG_OUT3_PIN 31 #endif

// PWM_DEFAULT_CONFIG_BASE_CLOCK  - Base clock   // 16 MHz  // 8 MHz  // 4 MHz  // 2 MHz  // 1 MHz  // 500 kHz  // 250 kHz  // 125 kHz 

#ifndef PWM_DEFAULT_CONFIG_BASE_CLOCK #define PWM_DEFAULT_CONFIG_BASE_CLOCK 4 #endif

// PWM_DEFAULT_CONFIG_COUNT_MODE  - Count mode   // Up  // Up and Down 

#ifndef PWM_DEFAULT_CONFIG_COUNT_MODE #define PWM_DEFAULT_CONFIG_COUNT_MODE 0 #endif

// PWM_DEFAULT_CONFIG_TOP_VALUE - Top value  #ifndef PWM_DEFAULT_CONFIG_TOP_VALUE #define PWM_DEFAULT_CONFIG_TOP_VALUE 1000 #endif

// PWM_DEFAULT_CONFIG_LOAD_MODE  - Load mode   // Common  // Grouped  // Individual  // Waveform 

#ifndef PWM_DEFAULT_CONFIG_LOAD_MODE #define PWM_DEFAULT_CONFIG_LOAD_MODE 0 #endif

// PWM_DEFAULT_CONFIG_STEP_MODE  - Step mode   // Auto  // Triggered 

#ifndef PWM_DEFAULT_CONFIG_STEP_MODE #define PWM_DEFAULT_CONFIG_STEP_MODE 0 #endif

// PWM_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority  

// Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice // 0 (highest)  // 1  // 2  // 3  // 4  // 5  // 6  // 7 

#ifndef PWM_DEFAULT_CONFIG_IRQ_PRIORITY #define PWM_DEFAULT_CONFIG_IRQ_PRIORITY 6 #endif

// PWM0_ENABLED  - Enable PWM0 instance  

#ifndef PWM0_ENABLED #define PWM0_ENABLED 1 #endif

// PWM1_ENABLED  - Enable PWM1 instance  

#ifndef PWM1_ENABLED #define PWM1_ENABLED 1 #endif

// PWM2_ENABLED  - Enable PWM2 instance  

#ifndef PWM2_ENABLED #define PWM2_ENABLED 1 #endif

// PWM_NRF52_ANOMALY_109_WORKAROUND_ENABLED - Enables nRF52 Anomaly 109 workaround for PWM.

// The workaround uses interrupts to wake up the CPU and ensure // it is active when PWM is about to start a DMA transfer. For // initial transfer, done when a playback is started via PPI, // a specific EGU instance is used to generate the interrupt. // During the playback, the PWM interrupt triggered on SEQEND // event of a preceding sequence is used to protect the transfer // done for the next sequence to be played. //========================================================== #ifndef PWM_NRF52_ANOMALY_109_WORKAROUND_ENABLED #define PWM_NRF52_ANOMALY_109_WORKAROUND_ENABLED 0 #endif // PWM_NRF52_ANOMALY_109_EGU_INSTANCE  - EGU instance used by the nRF52 Anomaly 109 workaround for PWM.   // EGU0  // EGU1  // EGU2  // EGU3  // EGU4  // EGU5 

#ifndef PWM_NRF52_ANOMALY_109_EGU_INSTANCE #define PWM_NRF52_ANOMALY_109_EGU_INSTANCE 5 #endif

2.导入文件nrfx_pwm.c到工程中

3.引入头文件

#include "nrf_drv_pwm.h"

4.定义PWM实例

static nrf_drv_pwm_t m_pwm0 = NRF_DRV_PWM_INSTANCE(0);

5.定义变量

// This is for tracking PWM instances being used, so we can unintialize only // the relevant ones when switching from one demo to another. #define USED_PWM(idx) (1UL