我想通过DMA向GPIO引脚写入数据，在GD32F105RBT6下测试成功，但是在F405下一直没效果，求教大佬们！
代码如下：
测试功能：通过修改dma_buffer中数据来点亮PA8引脚上的LED灯
#define TRANSFER_NUM 1
uint32_t dma_buffer[TRANSFER_NUM] = {0};
void dma_test_gpio_config(void);
void dma_test_timer_config(void);
void dma_test_dma_config(void);
void dma_test_gpio_config(void)
{
rcu_periph_clock_enable(RCU_GPIOA);
/*configure PA8(TIMER0 CH0) as alternate function*/
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_8);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_8);
}
void dma_test_dma_config(void)
{
dma_single_data_parameter_struct dma_init_struct;
rcu_periph_clock_enable(RCU_DMA1);
dma_deinit(DMA1, DMA_CH5);
dma_init_struct.direction = DMA_MEMORY_TO_PERIPH;
dma_init_struct.memory0_addr = (uint32_t)dma_buffer;
dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_init_struct.periph_memory_width = DMA_MEMORY_WIDTH_32BIT;
dma_init_struct.number = TRANSFER_NUM;
dma_init_struct.periph_addr = (uint32_t)&GPIO_OCTL(GPIOA);
dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
dma_init_struct.circular_mode = DMA_CIRCULAR_MODE_ENABLE;
dma_single_data_mode_init(DMA1, DMA_CH5, &dma_init_struct);
dma_channel_subperipheral_select(DMA1,DMA_CH5,DMA_SUBPERI6);
/* enable DMA1 transfer */
dma_channel_enable(DMA1, DMA_CH5);
}
void dma_test_timer_config(void)
{
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;
rcu_periph_clock_enable(RCU_TIMER0);
timer_deinit(TIMER0);
/* TIMER0 configuration */
timer_initpara.prescaler = 1680-1;//0;//107;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 10000;//135;//999;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);
/* CH0 configuration in PWM1 mode */
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_HIGH;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);
timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,0);
// timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_ACTIVE);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);
timer_primary_output_config(TIMER0,ENABLE);
timer_dma_enable(TIMER0,TIMER_DMA_UPD);
timer_auto_reload_shadow_enable(TIMER0);
timer_enable(TIMER0);
}
void dma_test_init(void)
{
dma_test_gpio_config();
dma_test_dma_config();
dma_test_timer_config();
GPIO_OCTL(GPIOA) = 0;//0xFFFF;
}
void dma_test_loop(void){
int n = 0;
while(1){
if(n == 0){
dma_buffer[0] = 0x0000;
n = 1;
}else{
dma_buffer[0] = 0xffff;
n = 0;
}
delay_1ms(500);
}
}
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