自己写的程序想要实现timer控制dac输出正弦波 ，用到dma。出现了问题，无法输出波形，输出结果为杂波，有没有大神帮忙看一下，万分感谢！
static void sin_dac_gpio_config(void)
{
/* enable the clock of peripherals */
rcu_periph_clock_enable(SIN_DAC_CLK);
rcu_periph_clock_enable(SIN_DAC_CLK);
rcu_periph_clock_enable(RCU_CRC);
/* once enabled the DAC, the corresponding GPIO pin is connected to the DAC converter automatically */
gpio_output_options_set(SIN_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, SIN_PIN);//推挽输出
gpio_mode_set(SIN_GPIO_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, SIN_PIN);
}
/*DAC通道输出配置，定时器6触发，不开启输出缓存*/
static void sin_adc_channel_config(void)
{
dac_deinit();
dac_trigger_disable(SIN_DAC);
dac_wave_mode_config(SIN_DAC, DAC_WAVE_DISABLE);
dac_output_buffer_disable(SIN_DAC);
dac_trigger_source_config(SIN_DAC,DAC_TRIGGER_T6_TRGO);
dac_interrupt_disable(SIN_DAC);
dac_dma_enable(SIN_DAC);
dac_trigger_enable(SIN_DAC);
dac_enable(SIN_DAC);
}
//DMA配置
static void sin_dma_config(void)
{
dma_single_data_parameter_struct dma_init_struct;
/* enable DMA CLK */
rcu_periph_clock_enable(SIN_DMA_CLK);
/* deinitialize DMA channel3(USART0 tx) */
dma_deinit(SIN_DMA, SIN_DMA_CHANNEL);
dma_init_struct.direction = DMA_MEMORY_TO_PERIPH;
// dma_init_struct.memory_addr = ;
// dma_init_struct.memory0_addr = (uint32_t)Sine;
dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_init_struct.periph_memory_width = DMA_MEMORY_WIDTH_16BIT;
// dma_init_struct.number = POINT_NUM2;
// dma_init_struct.periph_addr = ((uint32_t)(&DAC0_R12DH));;
dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
dma_single_data_mode_init(SIN_DMA, SIN_DMA_CHANNEL, dma_init_struct);
}
void sin_dma_function_config(void)
{
//DMAx的通道y的存储器基地址配置
dma_memory_address_config(SIN_DMA,SIN_DMA_CHANNEL,DMA_MEMORY_1,(uint32_t)Sine); //(uint32_t)Sine
//配置DMAx通道y还有多少数据要传输
dma_transfer_number_config(SIN_DMA,SIN_DMA_CHANNEL,ARRAYNUM(Sine));
//DMAx的通道y的外设基地址配置
dma_periph_address_config(SIN_DMA,SIN_DMA_CHANNEL,DAC0_R12DH_DAC0_DOADDRESS);
//DMA循环模式开启
dma_circulation_enable(SIN_DMA, SIN_DMA_CHANNEL);
//DMA的通道使能
dma_channel_enable(SIN_DMA, SIN_DMA_CHANNEL);
}
/*TIMx触发配置*/
void sin_timx_trigger_function_config(void)
{
timer_parameter_struct timer_initpara;
rcu_periph_clock_enable(SIN_TIM_CLK);
timer_deinit(SIN_TIM);
/* TIMER0 configuration */
timer_initpara.prescaler = 999;//预分频
timer_initpara.counterdirection = TIMER_COUNTER_UP;//向上计数
timer_initpara.period = 49;//定时周期
timer_init(SIN_TIM,&timer_initpara);
//定时器主输出触发源选择
timer_master_output_trigger_source_select(SIN_TIM,TIMER_TRI_OUT_SRC_UPDATE);
timer_update_event_enable(SIN_TIM);
}
/*操作函数*/
void sin_app(void)
{
sin_dma_config();
sin_dma_function_config();
sin_dac_gpio_config();
sin_adc_channel_config();
sin_timx_trigger_function_config();
timer_enable(SIN_TIM);
} |
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