文章目录[隐藏]
Windows 10 20H2
HLK-W806-V1.0-KIT
WM_SDK_W806_v0.6.0
摘自《W806 芯片设计指导书 V1.0》、《W806 MCU 芯片规格书 V2.0》
PWM 控制器
5 通道 PWM 信号生成功能
2 通道输入信号捕获功能（PWM0 和 PWM4 两个通路）
频率范围：3Hz~160KHz
占空比最大精度：1/256，插入死区的计数器宽度：8bit
库函数
函数
打开wm_pwm.h，有如下的函数声明：
HAL_StatusTypeDef HAL_PWM_Init(PWM_HandleTypeDef *hpwm);
//初始化PWM通道
HAL_StatusTypeDef HAL_PWM_DeInit(PWM_HandleTypeDef *hpwm);
//将初始化之后的通道恢复成默认的状态–各个寄存器复位时的值
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm);
//用于开启对应的时钟和复用对应引脚
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm);
//将对应时钟和引脚恢复成默认的状态–各个寄存器复位时的值
HAL_StatusTypeDef HAL_PWM_Start(PWM_HandleTypeDef *hpwm, uint32_t Channel);
//开始输出波形
HAL_StatusTypeDef HAL_PWM_Stop(PWM_HandleTypeDef *hpwm, uint32_t Channel);
//停止输出波形
HAL_StatusTypeDef HAL_PWM_Duty_Set(PWM_HandleTypeDef *hpwm, uint32_t Channel, uint32_t Duty);
//设置输出波形的占空比
HAL_StatusTypeDef HAL_PWM_Freq_Set(PWM_HandleTypeDef *hpwm, uint32_t Channel, uint32_t Prescaler, uint32_t Period);
//设置输出波形的频率
参数
结构体和枚举类型
typedef struct
{
uint32_t Prescaler; /* Specifies the prescaler value used to divide the PWM clock(40MHz).
This parameter can be a number between Min_Data = 0x0000 and Max_Data = 0xFFFF */
uint32_t CounterMode; /* Specifies the counter mode.
This parameter can be a value of @ref PWM_Counter_Mode */
uint32_t Period; /* Specifies the period value to be loaded into the PERIOD
Register at the next update event.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF. */
uint32_t Pulse; /* Specifies the pulse value to be loaded into the Compare Register.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF */
uint32_t AutoReloadPreload; /* Specifies the auto-reload preload.
This parameter can be a value of @ref TIM_AutoReloadPreload */
uint32_t OutMode; /* Specifies the output mode.
This parameter can be a value of @ref PWM_Out_Mode*/
uint32_t OutInverse; /* Specifies the output polarity.
This parameter can be a value of @ref PWM_Out_Inverse */
uint32_t Dtdiv; /* Specifies the prescaler value used to divide the dead zone clock(40MHz) when in complementary mode.
This parameter can be a value of @ref PWM_DT_DIV */
uint32_t Dtcnt; /* Specifies the number of dead time clocks when in complementary mode.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF */
} PWM_InitTypeDef;
typedef struct
{
PWM_TypeDef *Instance;
PWM_InitTypeDef Init;
uint32_t Channel; /* This parameter can be a value of @ref PWM_Channel */
} PWM_HandleTypeDef;
宏参数
#define PWM ((PWM_TypeDef *)PWM_BASE)
// PWM_Channel
#define PWM_CHANNEL_0 0x00
#define PWM_CHANNEL_1 0x01
#define PWM_CHANNEL_2 0x02
#define PWM_CHANNEL_3 0x03
#define PWM_CHANNEL_4 0x04
#define PWM_CHANNEL_ALL 0x01F
// PWM_Counter_Mode
#define PWM_COUNTERMODE_EDGEALIGNED_UP 0x0 // edge-aligned up mode for capture
#define PWM_COUNTERMODE_EDGEALIGNED_DOWN 0x1 // edge-aligned up mode for out
#define PWM_COUNTERMODE_CENTERALIGNED 0x2 // center-aligned mode for out
// PWM_AutoReloadPreload
#define PWM_AUTORELOAD_PRELOAD_DISABLE 0x00 // TIMx_ARR register is not buffered
#define PWM_AUTORELOAD_PRELOAD_ENABLE 0x01 // TIMx_ARR register is buffered
// PWM_Out_Mode
#define PWM_OUT_MODE_INDEPENDENT 0x00
#define PWM_OUT_MODE_2SYNC 0x01
#define PWM_OUT_MODE_2COMPLEMENTARY 0x02
#define PWM_OUT_MODE_5SYNC 0x03
#define PWM_OUT_MODE_BREAK 0x04
// PWM_Out_Inverse
#define PWM_OUT_INVERSE_DISABLE 0x00
#define PWM_OUT_INVERSE_ENABLE 0x01
// PWM_DT_DIV
#define PWM_DTDIV_NONE PWM_DTCR_DTDIV_1
#define PWM_DTDIV_2 PWM_DTCR_DTDIV_2
#define PWM_DTDIV_4 PWM_DTCR_DTDIV_4
#define PWM_DTDIV_8 PWM_DTCR_DTDIV_8
宏
#define IS_PWM_INSTANCE(INSTANCE) (((INSTANCE) == PWM))
#define IS_PWM_CHANNELS(__CHANNEL__) (((__CHANNEL__) == PWM_CHANNEL_0) || \
((__CHANNEL__) == PWM_CHANNEL_1) || \
((__CHANNEL__) == PWM_CHANNEL_2) || \
((__CHANNEL__) == PWM_CHANNEL_3) || \
((__CHANNEL__) == PWM_CHANNEL_4) || \
((__CHANNEL__) == PWM_CHANNEL_ALL))
#define IS_PWM_PRESCALER(__PRESCALER__) (((__PRESCALER__) >= 0x0000) && ((__PRESCALER__) <= 0x0FFFF))
#define IS_PWM_COUNTER_MODE(__MODE__) (((__MODE__) == PWM_COUNTERMODE_EDGEALIGNED_UP) || \
((__MODE__) == PWM_COUNTERMODE_EDGEALIGNED_DOWN) || \
((__MODE__) == PWM_COUNTERMODE_CENTERALIGNED))
#define IS_PWM_PERIOD(__PERIOD__) (((__PERIOD__) >= 0x00) && ((__PERIOD__) <= 0x0FF))
#define IS_PWM_PULSE(__PULSE__) (((__PULSE__) >= 0x00) && ((__PULSE__) <= 0x0FF))
#define IS_PWM_AUTORELOADPRELOAD(__AUTORELOAD__) (((__AUTORELOAD__) == PWM_AUTORELOAD_PRELOAD_DISABLE) || \
((__AUTORELOAD__) == PWM_AUTORELOAD_PRELOAD_ENABLE))
#define IS_PWM_OUTMODE(__MODE__) (((__MODE__) == PWM_OUT_MODE_INDEPENDENT) || \
((__MODE__) == PWM_OUT_MODE_2SYNC) || \
((__MODE__) == PWM_OUT_MODE_2COMPLEMENTARY) || \
((__MODE__) == PWM_OUT_MODE_5SYNC))
#define IS_PWM_OUTINVERSE(__INVERSE__) (((__INVERSE__) == PWM_OUT_INVERSE_DISABLE) || \
((__INVERSE__) == PWM_OUT_INVERSE_ENABLE))
#define IS_PWM_DTDIV(__DIV__) (((__DIV__) == PWM_DTDIV_NONE) || \
((__DIV__) == PWM_DTDIV_2) || \
((__DIV__) == PWM_DTDIV_4) || \
((__DIV__) == PWM_DTDIV_8))
#define IS_PWM_DTCNT(__CNT__) (((__CNT__) >= 0) && ((__CNT__) <= 0x0FF))
测试程序
独立模式
main.c
#include <stdio.h>
#include "wm_hal.h"
PWM_HandleTypeDef hpwm;
static void PWM_Init(void);
void Error_Handler(void);
uint32_t ch = PWM_CHANNEL_1;
int main(void)
{
int i = 0;
SystemClock_Config(CPU_CLK_160M);
printf("enter main\r\n");
PWM_Init();
HAL_PWM_Start(&hpwm, ch);
while (1)
{
for (i = 0; i < 200; i++)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
for (i = 200 - 1; i >= 0; i--)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
}
}
/* 输出波形的频率： f = 40MHz / Prescaler / (Period + 1)；
* 输出波形的占空比：
* 沿对齐模式（递减）：(Pulse + 1) / (Period + 1)
* Pulse >= Period：PWM输出一直为高电平
* Pulse < Period ：PWM输出高电平宽度为(Pulse + 1)，低电平宽度为(Period - Pulse)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(Period)
*
* 中间对齐模式 ：(2 * Pulse + 1) / (2 * (Period + 1))
* Pulse > Period ：PWM输出一直为高电平
* Pulse <= Period：PWM输出高电平宽度为(2 * Pulse + 1)，低电平宽度为(2 * (Period - Pulse) + 1)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(2 * Period + 1)
*/
static void PWM_Init(void)
{
// 输出50Hz、占空比25%的波形
hpwm.Instance = PWM;
hpwm.Init.AutoReloadPreload = PWM_AUTORELOAD_PRELOAD_ENABLE;
hpwm.Init.CounterMode = PWM_COUNTERMODE_EDGEALIGNED_DOWN;
hpwm.Init.Prescaler = 4000; //0~65535
hpwm.Init.Period = 200 - 1; //0~255 40MHz / 4000 / 200 = 50Hz (默认PWM时钟为40MHz)
hpwm.Init.Pulse = 200 / 4 - 1; //0~255 25% DUTY
hpwm.Init.OutMode = PWM_OUT_MODE_INDEPENDENT;
hpwm.Channel = ch;
HAL_PWM_Init(&hpwm);
}
void Error_Handler(void)
{
while (1)
{
}
}
void assert_failed(uint8_t *file, uint32_t line)
{
printf("Wrong parameters value: file %s on line %d\r\n", file, line);
}
wm_hal_msp.c
配置引脚复用。
#include "wm_hal.h"
void HAL_MspInit(void)
{
}
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_ENABLE();
__HAL_AFIO_REMAP_PWM1(GPIOB, GPIO_PIN_1);
}
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_DISABLE();
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_1);
}
wm_it.c
#include "wm_hal.h"
#define readl(addr) ({unsigned int __v = (*(volatile unsigned int *) (addr)); __v;})
__attribute__((isr)) void CORET_IRQHandler(void)
{
readl(0xE000E010);
HAL_IncTick();
}
实验现象
可见输出的PWM信号为50Hz，占空比在0~100%间变化。
多通道同步模式
需要注意的是
配置占空比的函数是没有关于PWM_CHANNEL_ALL的实现的：
要用PWM_CHANNEL_0才能跑出来
main.c
#include <stdio.h>
#include "wm_hal.h"
PWM_HandleTypeDef hpwm;
static void PWM_Init(void);
static void GPIO_Init(void);
void Error_Handler(void);
uint32_t ch = PWM_CHANNEL_0;
int main(void)
{
int i = 0;
SystemClock_Config(CPU_CLK_160M);
printf("enter main\r\n");
GPIO_Init();
PWM_Init();
HAL_PWM_Start(&hpwm, ch);
while (1)
{
for (i = 0; i < 200; i++)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
for (i = 200 - 1; i >= 0; i--)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
}
}
static void GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIO_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_16;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_16, GPIO_PIN_SET);
}
/* 输出波形的频率： f = 40MHz / Prescaler / (Period + 1)；
* 输出波形的占空比：
* 沿对齐模式（递减）：(Pulse + 1) / (Period + 1)
* Pulse >= Period：PWM输出一直为高电平
* Pulse < Period ：PWM输出高电平宽度为(Pulse + 1)，低电平宽度为(Period - Pulse)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(Period)
*
* 中间对齐模式 ：(2 * Pulse + 1) / (2 * (Period + 1))
* Pulse > Period ：PWM输出一直为高电平
* Pulse <= Period：PWM输出高电平宽度为(2 * Pulse + 1)，低电平宽度为(2 * (Period - Pulse) + 1)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(2 * Period + 1)
*/
static void PWM_Init(void)
{
// 输出50Hz、占空比25%的波形
hpwm.Instance = PWM;
hpwm.Init.AutoReloadPreload = PWM_AUTORELOAD_PRELOAD_ENABLE;
hpwm.Init.CounterMode = PWM_COUNTERMODE_EDGEALIGNED_DOWN;
hpwm.Init.Prescaler = 4000; //0~65535
hpwm.Init.Period = 200 - 1; //0~255 40MHz / 4000 / 200 = 50Hz (默认PWM时钟为40MHz)
hpwm.Init.Pulse = 200 / 4 - 1; //0~255 25% DUTY
hpwm.Init.OutMode = PWM_OUT_MODE_5SYNC;
hpwm.Channel = ch;
HAL_PWM_Init(&hpwm);
}
void Error_Handler(void)
{
while (1)
{
}
}
void assert_failed(uint8_t *file, uint32_t line)
{
printf("Wrong parameters value: file %s on line %d\r\n", file, line);
}
wm_hal_msp.c
#include "wm_hal.h"
void HAL_MspInit(void)
{
}
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_ENABLE();
__HAL_AFIO_REMAP_PWM0(GPIOB, GPIO_PIN_0);
__HAL_AFIO_REMAP_PWM1(GPIOB, GPIO_PIN_1);
__HAL_AFIO_REMAP_PWM2(GPIOB, GPIO_PIN_2);
__HAL_AFIO_REMAP_PWM3(GPIOB, GPIO_PIN_3);
__HAL_AFIO_REMAP_PWM4(GPIOB, GPIO_PIN_16);
}
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_DISABLE();
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_0);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_1);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_2);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_3);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_16);
}
wm_it.c
#include "wm_hal.h"
#define readl(addr) ({unsigned int __v = (*(volatile unsigned int *) (addr)); __v;})
__attribute__((isr)) void CORET_IRQHandler(void)
{
readl(0xE000E010);
HAL_IncTick();
}
实验现象
可见3个LED都实现了类似呼吸灯的效果
版权声明：本文为CSDN博主「乙酸氧铍」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_44457994/article/details/122597641
Windows 10 20H2
HLK-W806-V1.0-KIT
WM_SDK_W806_v0.6.0
摘自《W806 芯片设计指导书 V1.0》、《W806 MCU 芯片规格书 V2.0》
PWM 控制器
5 通道 PWM 信号生成功能
2 通道输入信号捕获功能（PWM0 和 PWM4 两个通路）
频率范围：3Hz~160KHz
占空比最大精度：1/256，插入死区的计数器宽度：8bit
库函数
函数
打开wm_pwm.h，有如下的函数声明：
HAL_StatusTypeDef HAL_PWM_Init(PWM_HandleTypeDef *hpwm);
//初始化PWM通道
HAL_StatusTypeDef HAL_PWM_DeInit(PWM_HandleTypeDef *hpwm);
//将初始化之后的通道恢复成默认的状态–各个寄存器复位时的值
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm);
//用于开启对应的时钟和复用对应引脚
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm);
//将对应时钟和引脚恢复成默认的状态–各个寄存器复位时的值
HAL_StatusTypeDef HAL_PWM_Start(PWM_HandleTypeDef *hpwm, uint32_t Channel);
//开始输出波形
HAL_StatusTypeDef HAL_PWM_Stop(PWM_HandleTypeDef *hpwm, uint32_t Channel);
//停止输出波形
HAL_StatusTypeDef HAL_PWM_Duty_Set(PWM_HandleTypeDef *hpwm, uint32_t Channel, uint32_t Duty);
//设置输出波形的占空比
HAL_StatusTypeDef HAL_PWM_Freq_Set(PWM_HandleTypeDef *hpwm, uint32_t Channel, uint32_t Prescaler, uint32_t Period);
//设置输出波形的频率
参数
结构体和枚举类型
typedef struct
{
uint32_t Prescaler; /* Specifies the prescaler value used to divide the PWM clock(40MHz).
This parameter can be a number between Min_Data = 0x0000 and Max_Data = 0xFFFF */
uint32_t CounterMode; /* Specifies the counter mode.
This parameter can be a value of @ref PWM_Counter_Mode */
uint32_t Period; /* Specifies the period value to be loaded into the PERIOD
Register at the next update event.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF. */
uint32_t Pulse; /* Specifies the pulse value to be loaded into the Compare Register.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF */
uint32_t AutoReloadPreload; /* Specifies the auto-reload preload.
This parameter can be a value of @ref TIM_AutoReloadPreload */
uint32_t OutMode; /* Specifies the output mode.
This parameter can be a value of @ref PWM_Out_Mode*/
uint32_t OutInverse; /* Specifies the output polarity.
This parameter can be a value of @ref PWM_Out_Inverse */
uint32_t Dtdiv; /* Specifies the prescaler value used to divide the dead zone clock(40MHz) when in complementary mode.
This parameter can be a value of @ref PWM_DT_DIV */
uint32_t Dtcnt; /* Specifies the number of dead time clocks when in complementary mode.
This parameter can be a number between Min_Data = 0x00 and Max_Data = 0xFF */
} PWM_InitTypeDef;
typedef struct
{
PWM_TypeDef *Instance;
PWM_InitTypeDef Init;
uint32_t Channel; /* This parameter can be a value of @ref PWM_Channel */
} PWM_HandleTypeDef;
宏参数
#define PWM ((PWM_TypeDef *)PWM_BASE)
// PWM_Channel
#define PWM_CHANNEL_0 0x00
#define PWM_CHANNEL_1 0x01
#define PWM_CHANNEL_2 0x02
#define PWM_CHANNEL_3 0x03
#define PWM_CHANNEL_4 0x04
#define PWM_CHANNEL_ALL 0x01F
// PWM_Counter_Mode
#define PWM_COUNTERMODE_EDGEALIGNED_UP 0x0 // edge-aligned up mode for capture
#define PWM_COUNTERMODE_EDGEALIGNED_DOWN 0x1 // edge-aligned up mode for out
#define PWM_COUNTERMODE_CENTERALIGNED 0x2 // center-aligned mode for out
// PWM_AutoReloadPreload
#define PWM_AUTORELOAD_PRELOAD_DISABLE 0x00 // TIMx_ARR register is not buffered
#define PWM_AUTORELOAD_PRELOAD_ENABLE 0x01 // TIMx_ARR register is buffered
// PWM_Out_Mode
#define PWM_OUT_MODE_INDEPENDENT 0x00
#define PWM_OUT_MODE_2SYNC 0x01
#define PWM_OUT_MODE_2COMPLEMENTARY 0x02
#define PWM_OUT_MODE_5SYNC 0x03
#define PWM_OUT_MODE_BREAK 0x04
// PWM_Out_Inverse
#define PWM_OUT_INVERSE_DISABLE 0x00
#define PWM_OUT_INVERSE_ENABLE 0x01
// PWM_DT_DIV
#define PWM_DTDIV_NONE PWM_DTCR_DTDIV_1
#define PWM_DTDIV_2 PWM_DTCR_DTDIV_2
#define PWM_DTDIV_4 PWM_DTCR_DTDIV_4
#define PWM_DTDIV_8 PWM_DTCR_DTDIV_8
宏
#define IS_PWM_INSTANCE(INSTANCE) (((INSTANCE) == PWM))
#define IS_PWM_CHANNELS(__CHANNEL__) (((__CHANNEL__) == PWM_CHANNEL_0) || \
((__CHANNEL__) == PWM_CHANNEL_1) || \
((__CHANNEL__) == PWM_CHANNEL_2) || \
((__CHANNEL__) == PWM_CHANNEL_3) || \
((__CHANNEL__) == PWM_CHANNEL_4) || \
((__CHANNEL__) == PWM_CHANNEL_ALL))
#define IS_PWM_PRESCALER(__PRESCALER__) (((__PRESCALER__) >= 0x0000) && ((__PRESCALER__) <= 0x0FFFF))
#define IS_PWM_COUNTER_MODE(__MODE__) (((__MODE__) == PWM_COUNTERMODE_EDGEALIGNED_UP) || \
((__MODE__) == PWM_COUNTERMODE_EDGEALIGNED_DOWN) || \
((__MODE__) == PWM_COUNTERMODE_CENTERALIGNED))
#define IS_PWM_PERIOD(__PERIOD__) (((__PERIOD__) >= 0x00) && ((__PERIOD__) <= 0x0FF))
#define IS_PWM_PULSE(__PULSE__) (((__PULSE__) >= 0x00) && ((__PULSE__) <= 0x0FF))
#define IS_PWM_AUTORELOADPRELOAD(__AUTORELOAD__) (((__AUTORELOAD__) == PWM_AUTORELOAD_PRELOAD_DISABLE) || \
((__AUTORELOAD__) == PWM_AUTORELOAD_PRELOAD_ENABLE))
#define IS_PWM_OUTMODE(__MODE__) (((__MODE__) == PWM_OUT_MODE_INDEPENDENT) || \
((__MODE__) == PWM_OUT_MODE_2SYNC) || \
((__MODE__) == PWM_OUT_MODE_2COMPLEMENTARY) || \
((__MODE__) == PWM_OUT_MODE_5SYNC))
#define IS_PWM_OUTINVERSE(__INVERSE__) (((__INVERSE__) == PWM_OUT_INVERSE_DISABLE) || \
((__INVERSE__) == PWM_OUT_INVERSE_ENABLE))
#define IS_PWM_DTDIV(__DIV__) (((__DIV__) == PWM_DTDIV_NONE) || \
((__DIV__) == PWM_DTDIV_2) || \
((__DIV__) == PWM_DTDIV_4) || \
((__DIV__) == PWM_DTDIV_8))
#define IS_PWM_DTCNT(__CNT__) (((__CNT__) >= 0) && ((__CNT__) <= 0x0FF))
测试程序
独立模式
main.c
#include <stdio.h>
#include "wm_hal.h"
PWM_HandleTypeDef hpwm;
static void PWM_Init(void);
void Error_Handler(void);
uint32_t ch = PWM_CHANNEL_1;
int main(void)
{
int i = 0;
SystemClock_Config(CPU_CLK_160M);
printf("enter main\r\n");
PWM_Init();
HAL_PWM_Start(&hpwm, ch);
while (1)
{
for (i = 0; i < 200; i++)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
for (i = 200 - 1; i >= 0; i--)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
}
}
/* 输出波形的频率： f = 40MHz / Prescaler / (Period + 1)；
* 输出波形的占空比：
* 沿对齐模式（递减）：(Pulse + 1) / (Period + 1)
* Pulse >= Period：PWM输出一直为高电平
* Pulse < Period ：PWM输出高电平宽度为(Pulse + 1)，低电平宽度为(Period - Pulse)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(Period)
*
* 中间对齐模式 ：(2 * Pulse + 1) / (2 * (Period + 1))
* Pulse > Period ：PWM输出一直为高电平
* Pulse <= Period：PWM输出高电平宽度为(2 * Pulse + 1)，低电平宽度为(2 * (Period - Pulse) + 1)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(2 * Period + 1)
*/
static void PWM_Init(void)
{
// 输出50Hz、占空比25%的波形
hpwm.Instance = PWM;
hpwm.Init.AutoReloadPreload = PWM_AUTORELOAD_PRELOAD_ENABLE;
hpwm.Init.CounterMode = PWM_COUNTERMODE_EDGEALIGNED_DOWN;
hpwm.Init.Prescaler = 4000; //0~65535
hpwm.Init.Period = 200 - 1; //0~255 40MHz / 4000 / 200 = 50Hz (默认PWM时钟为40MHz)
hpwm.Init.Pulse = 200 / 4 - 1; //0~255 25% DUTY
hpwm.Init.OutMode = PWM_OUT_MODE_INDEPENDENT;
hpwm.Channel = ch;
HAL_PWM_Init(&hpwm);
}
void Error_Handler(void)
{
while (1)
{
}
}
void assert_failed(uint8_t *file, uint32_t line)
{
printf("Wrong parameters value: file %s on line %d\r\n", file, line);
}
wm_hal_msp.c
配置引脚复用。
#include "wm_hal.h"
void HAL_MspInit(void)
{
}
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_ENABLE();
__HAL_AFIO_REMAP_PWM1(GPIOB, GPIO_PIN_1);
}
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_DISABLE();
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_1);
}
wm_it.c
#include "wm_hal.h"
#define readl(addr) ({unsigned int __v = (*(volatile unsigned int *) (addr)); __v;})
__attribute__((isr)) void CORET_IRQHandler(void)
{
readl(0xE000E010);
HAL_IncTick();
}
实验现象
可见输出的PWM信号为50Hz，占空比在0~100%间变化。
多通道同步模式
需要注意的是
配置占空比的函数是没有关于PWM_CHANNEL_ALL的实现的：
要用PWM_CHANNEL_0才能跑出来
main.c
#include <stdio.h>
#include "wm_hal.h"
PWM_HandleTypeDef hpwm;
static void PWM_Init(void);
static void GPIO_Init(void);
void Error_Handler(void);
uint32_t ch = PWM_CHANNEL_0;
int main(void)
{
int i = 0;
SystemClock_Config(CPU_CLK_160M);
printf("enter main\r\n");
GPIO_Init();
PWM_Init();
HAL_PWM_Start(&hpwm, ch);
while (1)
{
for (i = 0; i < 200; i++)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
for (i = 200 - 1; i >= 0; i--)
{
HAL_PWM_Duty_Set(&hpwm, ch, i);
HAL_Delay(20);
}
}
}
static void GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIO_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_16;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_16, GPIO_PIN_SET);
}
/* 输出波形的频率： f = 40MHz / Prescaler / (Period + 1)；
* 输出波形的占空比：
* 沿对齐模式（递减）：(Pulse + 1) / (Period + 1)
* Pulse >= Period：PWM输出一直为高电平
* Pulse < Period ：PWM输出高电平宽度为(Pulse + 1)，低电平宽度为(Period - Pulse)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(Period)
*
* 中间对齐模式 ：(2 * Pulse + 1) / (2 * (Period + 1))
* Pulse > Period ：PWM输出一直为高电平
* Pulse <= Period：PWM输出高电平宽度为(2 * Pulse + 1)，低电平宽度为(2 * (Period - Pulse) + 1)
* Pulse = 0 ：PWM输出高电平宽度为(1)，低电平宽度为(2 * Period + 1)
*/
static void PWM_Init(void)
{
// 输出50Hz、占空比25%的波形
hpwm.Instance = PWM;
hpwm.Init.AutoReloadPreload = PWM_AUTORELOAD_PRELOAD_ENABLE;
hpwm.Init.CounterMode = PWM_COUNTERMODE_EDGEALIGNED_DOWN;
hpwm.Init.Prescaler = 4000; //0~65535
hpwm.Init.Period = 200 - 1; //0~255 40MHz / 4000 / 200 = 50Hz (默认PWM时钟为40MHz)
hpwm.Init.Pulse = 200 / 4 - 1; //0~255 25% DUTY
hpwm.Init.OutMode = PWM_OUT_MODE_5SYNC;
hpwm.Channel = ch;
HAL_PWM_Init(&hpwm);
}
void Error_Handler(void)
{
while (1)
{
}
}
void assert_failed(uint8_t *file, uint32_t line)
{
printf("Wrong parameters value: file %s on line %d\r\n", file, line);
}
wm_hal_msp.c
#include "wm_hal.h"
void HAL_MspInit(void)
{
}
void HAL_PWM_MspInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_ENABLE();
__HAL_AFIO_REMAP_PWM0(GPIOB, GPIO_PIN_0);
__HAL_AFIO_REMAP_PWM1(GPIOB, GPIO_PIN_1);
__HAL_AFIO_REMAP_PWM2(GPIOB, GPIO_PIN_2);
__HAL_AFIO_REMAP_PWM3(GPIOB, GPIO_PIN_3);
__HAL_AFIO_REMAP_PWM4(GPIOB, GPIO_PIN_16);
}
void HAL_PWM_MspDeInit(PWM_HandleTypeDef *hpwm)
{
__HAL_RCC_PWM_CLK_DISABLE();
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_0);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_1);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_2);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_3);
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_16);
}
wm_it.c
#include "wm_hal.h"
#define readl(addr) ({unsigned int __v = (*(volatile unsigned int *) (addr)); __v;})
__attribute__((isr)) void CORET_IRQHandler(void)
{
readl(0xE000E010);
HAL_IncTick();
}
实验现象
可见3个LED都实现了类似呼吸灯的效果
版权声明：本文为CSDN博主「乙酸氧铍」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_44457994/article/details/122597641
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