129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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*Timer DMA routines:
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*TIM1_CH1(PA8)
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*This example demonstrates using DMA to output PWM through TIM1_CH1(PA8) pin.
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*
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*/
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#include "debug.h"
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/* CH1CVR register Definition */
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#define TIM1_CH1CVR_ADDRESS 0x40012C34
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/* Private variables */
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u16 pbuf[3] = {10, 50, 80};
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/*********************************************************************
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* @fn TIM1_PWMOut_Init
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*
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* @brief Initializes TIM1 PWM output.
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*
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* @param arr - the period value.
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* psc - the prescaler value.
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* ccp - the pulse value.
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*
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* @return none
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*/
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void TIM1_PWMOut_Init(u16 arr, u16 psc, u16 ccp)
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{
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GPIO_InitTypeDef GPIO_InitStructure = {0};
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TIM_OCInitTypeDef TIM_OCInitStructure = {0};
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TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure = {0};
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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TIM_TimeBaseInitStructure.TIM_Period = arr;
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TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
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TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
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TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
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TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCInitStructure.TIM_Pulse = ccp;
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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TIM_OC1Init(TIM1, &TIM_OCInitStructure);
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TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);
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TIM_ARRPreloadConfig(TIM1, ENABLE);
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}
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/*********************************************************************
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* @fn TIM1_DMA_Init
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*
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* @brief Initializes the TIM DMAy Channelx configuration.
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*
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* @param DMA_CHx -
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* x can be 1 to 7.
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* ppadr - Peripheral base address.
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* memadr - Memory base address.
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* bufsize - DMA channel buffer size.
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*
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* @return none
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*/
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void TIM1_DMA_Init(DMA_Channel_TypeDef *DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)
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{
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DMA_InitTypeDef DMA_InitStructure = {0};
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
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DMA_DeInit(DMA_CHx);
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DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;
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DMA_InitStructure.DMA_MemoryBaseAddr = memadr;
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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DMA_InitStructure.DMA_BufferSize = bufsize;
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
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DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
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DMA_Init(DMA_CHx, &DMA_InitStructure);
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DMA_Cmd(DMA_CHx, ENABLE);
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}
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/*********************************************************************
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* @fn main
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*
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* @brief Main program.
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*
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* @return none
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*/
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int main(void)
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{
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SystemCoreClockUpdate();
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USART_Printf_Init(115200);
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printf("SystemClk:%d\r\n", SystemCoreClock);
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printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
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TIM1_PWMOut_Init(100, 48000 - 1, pbuf[0]);
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TIM1_DMA_Init(DMA1_Channel5, (u32)TIM1_CH1CVR_ADDRESS, (u32)pbuf, 3);
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TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
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TIM_Cmd(TIM1, ENABLE);
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TIM_CtrlPWMOutputs(TIM1, ENABLE);
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while(1);
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}
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