STM32定时器触发DMA采集捕获输入值

int main( void ) {

// //系统初始化 // system_init( ); //时钟初始化

drv_rcc_init( 0, 0, 64, APB1_PRESC_2, APB2_PRESC_1, 0x08000000 );

hal_timer_init( 5000 );

//TIM1配置为编码器模式DMA触发请求为外部其他定时的触发输出

//TIM4 配置为触发输出用于定时器给一个触发信号到TIM1 //输入通道引脚初始化

drv_rcc_ahb1_clk_enable( RCC_AHBENR_GPIOEEN ); drv_gpio_alternate_function_init( drv_gpio_alternate_function_init(

GPIOE, GPIOE,

GPIO_PIN_9, GPIO_PIN_11,

GPIOE, GPIOE,

GPIO_PUPD_PULL, GPIO_OTYPE_OD, GPIO_SPEED_MID ); GPIO_PUPD_PULL, GPIO_OTYPE_OD, GPIO_SPEED_MID );

drv_gpio_alternate_function_connect( GPIO_PINSOURCE9, GPIO_AF2_TIM1 );

drv_gpio_alternate_function_connect( GPIO_PINSOURCE11, GPIO_AF2_TIM1 );

//TIM1初始化

drv_rcc_apb2_clk_enable( RCC_APB2ENR_TIM1EN ); drv_timer_base_init( TIM_EDGE_CNT_MODE_UP );

drv_timer_select_input_trigger( TIM1, TIM_TS_ITR3 ); drv_timer_select_slave_mode( TIM_SLAVE_MODE_EQEP_3 ); //

TIM1,

TIM1,

0,

0xFFFF,

TIM_SLAVE_MODE_TRIGGER //输入通道配置 drv_timer_ic1_init( drv_timer_ic2_init(

TIM1, TIM1,

TIM_IC_POLARITY_RISING, TIM_IC_POLARITY_RISING,

TIM_IC_PSC_DIV_1, TIM_IC_SELECTION_1, Filter_NO ); TIM_IC_PSC_DIV_1, TIM_IC_SELECTION_1, Filter_NO );

drv_timer_ic1_enable( TIM1 ); drv_timer_ic2_enable( TIM1 ); //TIM定时器配置

TIM1->DIER.bit.TDE = 1; //使能触发DMA请求 TIM1->DCR.bit.DBL = 0; //传输个数

TIM1->DCR.bit.DBA = 9; //基地址为TIM1->CNT //TIM1 DMA初始化DMA1 CHANNEL4 :TIM1_TRIG drv_rcc_ahb1_clk_enable( RCC_AHBENR_DMA1EN ); drv_dma_stream_deinit( DMA1_Channel4 ); drv_dma_stream_init( (UINT32)g_TimerCntBuffer,

(UINT32)(&( TIM1->CNT )), 5, DMA_CIRC_MODE_ENABLE, DMA_CHANNEL_PRIORITY_VERY_HIGH,

DMA_DIR_PERIPH_TO_MEM, DMA_DATA_WIDTH_WORD ); drv_dma_stream_enable( DMA1_Channel4 ); //TIM4初始化

drv_rcc_apb1_clk_enable( RCC_APB1ENR_TIM4EN ); drv_timer_base_init( TIM_EDGE_CNT_MODE_UP );

drv_timer_select_output_trigger(

TIM_TRGOSource_Update ); //根新事件作为触发输出

drv_timer_enable( TIM1 ); drv_timer_enable( TIM4 ); while( 1 )

TIM4,

TIM4,

1000000,

5000,

DMA1_Channel4,

{

// hal_watchdog_feed( ); } }