1 void USART0_IRQHandler(void)
2 {
3 uint32_t buff_length = 0;
4 if (RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_IDLE))
5 {
6 usart_data_receive(USART0);
7 dma_channel_disable(DMA0, DMA_CH4);
8 buff_length = 128 - dma_transfer_number_get(DMA0,DMA_CH4);
9 memcpy(usart0_txbuffer,usart0_rxbuffer,buff_length);
10 UART0_Receive_DMA(usart0_rxbuffer,128);
11 }
12 }
1 void UART0_INIT(int baudrate)
2 {
3 rcu_periph_clock_enable(RCU_GPIOA);
4 rcu_periph_clock_enable(RCU_USART0);
5 //UART_TX
6 gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, USART0_TX);
7
8 //UART_RX
9 gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, USART0_RX);
10
11 usart_deinit(USART0);
12
13 usart_baudrate_set(USART0, baudrate);
14 usart_word_length_set(USART0, USART_WL_8BIT);
15 usart_stop_bit_set(USART0, USART_STB_1BIT);
16 usart_parity_config(USART0, USART_PM_NONE);
17 usart_hardware_flow_rts_config(USART0, USART_RTS_DISABLE);
18 usart_hardware_flow_cts_config(USART0, USART_CTS_DISABLE);
19 usart_receive_config(USART0, USART_RECEIVE_ENABLE);
20 usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
21
22 //设置串口中断使能
23 usart_interrupt_enable(USART0,USART_INT_IDLE);
24
25 usart_enable(USART0);
26 }
1 void UART0_Transmit_DMA(uint8_t *txbuffer, uint16_t Size)
2 {
3 /***************** DMA_TX_CONFIG ****************/
4
5 dma_parameter_struct dma_init_struct;
6 /* enable DMA0 */
7 rcu_periph_clock_enable(RCU_DMA0);
8 /* deinitialize DMA channel3(USART0 tx) */
9 dma_deinit(DMA0, DMA_CH3);
10 dma_init_struct.direction = DMA_MEMORY_TO_PERIPHERAL;
11 dma_init_struct.memory_addr = (uint32_t)txbuffer;
12 dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
13 dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
14 dma_init_struct.number = Size;
15 dma_init_struct.periph_addr = USART0_DATA_ADDRESS;
16 dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
17 // dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
18 dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
19 dma_init(DMA0, DMA_CH3, &dma_init_struct);
20 /* configure DMA mode */
21 dma_circulation_disable(DMA0, DMA_CH3);
22 dma_memory_to_memory_disable(DMA0, DMA_CH3);
23
24 // dma_deinit(DMA0, DMA_CH4);
25 // dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
26 // dma_init_struct.memory_addr = (uint32_t)rx_buffer;
27 // dma_init(DMA0, DMA_CH4, &dma_init_struct);
28 // /* configure DMA mode */
29 // dma_circulation_disable(DMA0, DMA_CH4);
30 // dma_memory_to_memory_disable(DMA0, DMA_CH4);
31 dma_channel_enable(DMA0, DMA_CH3);
32 usart_dma_transmit_config(USART0, USART_DENT_ENABLE);
33 // while(RESET == dma_flag_get(DMA0, DMA_CH3, DMA_FLAG_FTF)){
34 // }
35 }
1 void UART0_Receive_DMA(uint8_t *txbuffer, uint16_t Size)
2 {
3 /***************** DMA_TX_CONFIG ****************/
4 dma_parameter_struct dma_init_struct;
5 /* enable DMA1 */
6 rcu_periph_clock_enable(RCU_DMA0);
7 dma_deinit(DMA0, DMA_CH4);
8 dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
9 dma_init_struct.memory_addr = (uint32_t)txbuffer;
10 dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
11 dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
12 dma_init_struct.number = Size;
13 dma_init_struct.periph_addr = USART0_DATA_ADDRESS;
14 dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
15 dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
16 dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
17 // dma_single_data_mode_init(DMA0, DMA_CH5, dma_init_struct);
18 //查看手册
19 dma_init(DMA0, DMA_CH4, &dma_init_struct); //
20 //
21 /* configure DMA mode */
22 dma_circulation_disable(DMA0, DMA_CH4);
23 dma_memory_to_memory_disable(DMA0, DMA_CH4);
24 // dma_channel_subperipheral_select(DMA0, DMA_CH5, DMA_SUBPERI4);
25 /* enable DMA channel2 */
26 dma_channel_enable(DMA0, DMA_CH4);
27
28 usart_dma_receive_config(USART0, USART_DENR_ENABLE);
29 /* wait DMA channel transfer complete */
30 // while(RESET == dma_flag_get(DMA0, DMA_CH5, DMA_INTF_FTFIF));
31
32 }
