【AT-START-L021测评】串口中断通信
1，AT32 Work Bench v1.1.05 生成mdk代码
2，配置串口通信为发送中断，接收中断和中断允许。
代码如下
- void wk_usart1_init(void)
- {
- /* add user code begin usart1_init 0 */
- /* add user code end usart1_init 0 */
- gpio_init_type gpio_init_struct;
- gpio_default_para_init(&gpio_init_struct);
- /* add user code begin usart1_init 1 */
- /* add user code end usart1_init 1 */
- /* configure the TX pin */
- gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE9, GPIO_MUX_1);
- gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
- gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
- gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
- gpio_init_struct.gpio_pins = GPIO_PINS_9;
- gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
- gpio_init(GPIOA, &gpio_init_struct);
- /* configure the RX pin */
- gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE10, GPIO_MUX_1);
- gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
- gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
- gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
- gpio_init_struct.gpio_pins = GPIO_PINS_10;
- gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
- gpio_init(GPIOA, &gpio_init_struct);
- /* config usart1 clock source */
- crm_usart_clock_select(CRM_USART1, CRM_USART_CLOCK_SOURCE_PCLK);
- /* configure param */
- usart_init(USART1, 38400, USART_DATA_8BITS, USART_STOP_1_BIT);
- usart_transmitter_enable(USART1, TRUE);
- usart_receiver_enable(USART1, TRUE);
- usart_parity_selection_config(USART1, USART_PARITY_NONE);
- usart_hardware_flow_control_set(USART1, USART_HARDWARE_FLOW_NONE);
- /**
- * Users need to configure USART1 interrupt functions according to the actual application.
- * 1. Call the below function to enable the corresponding USART1 interrupt.
- * --usart_interrupt_enable(...)
- * 2. Add the user's interrupt handler code into the below function in the at32l021_int.c file.
- * --void USART1_IRQHandler(void)
- */
- /* add user code begin usart1_init 2 */
- <font color="#ff0000">usart_interrupt_enable(USART1, USART_RDBF_INT,TRUE),</font>
- /* add user code end usart1_init 2 */
- <font color="#8b0000">usart_enable(USART1, TRUE);</font>
- /* add user code begin usart1_init 3 */
- /* add user code end usart1_init 3 */
- }
3，编写接收中断发送中断子程序。
- extern uint8_t usart1_tx_buffer[];
- //extern uint8_t usart2_rx_buffer[];
- extern uint8_t usart1_rx_buffer[];
- //extern uint8_t usart2_tx_counter;
- extern uint8_t usart1_tx_counter;
- //extern uint8_t usart2_rx_counter;
- extern uint8_t usart1_rx_counter;
- //extern uint8_t usart2_tx_buffer_size;
- extern uint8_t usart1_tx_buffer_size;
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] this function handles USART1 handler.
- * @param none
- * @retval none
- */
- void USART1_IRQHandler(void)
- {
- /* add user code begin USART1_IRQ 0 */
- /* add user code end USART1_IRQ 0 */
- /* add user code begin USART1_IRQ 1 */
- if(usart_interrupt_flag_get(USART1, USART_RDBF_FLAG) != RESET)
- {
- /* read one byte from the receive data register */
- usart1_rx_buffer[usart1_rx_counter++] = usart_data_receive(USART1);
- if(usart1_rx_counter == usart1_tx_buffer_size)
- {
- /* disable the usart1 receive interrupt */
- // usart_interrupt_enable(USART1, USART_RDBF_INT, FALSE);
- usart1_rx_counter =0;
- }
- }
- if(usart_interrupt_flag_get(USART1, USART_TDBE_FLAG) != RESET)
- {
- /* write one byte to the transmit data register */
- // usart_data_transmit(USART1, usart1_tx_buffer[usart1_tx_counter++]);
- if(usart1_tx_counter == usart1_tx_buffer_size)
- {
- /* disable the usart1 transmit interrupt */
- // usart_interrupt_enable(USART1, USART_TDBE_INT, FALSE);
- usart1_tx_counter=0;
- }
- }
- /* add user code end USART1_IRQ 1 */
- }
4，编写主程序。
- /* private includes ----------------------------------------------------------*/
- /* add user code begin private includes */
- #define COUNTOF(a) (sizeof(a) / sizeof(*(a)))
- //#define USART2_TX_BUFFER_SIZE (COUNTOF(usart2_tx_buffer) - 1)
- #define USART1_TX_BUFFER_SIZE (COUNTOF(usart1_tx_buffer) - 1)
- //uint8_t usart2_tx_buffer[] = "usart transfer by interrupt: usart2 -> usart1 using interrupt";
- uint8_t usart1_rx_buffer[100];
- #define USART1_RX_BUFFER_SIZE (COUNTOF(usart1_rx_buffer) - 1)
- uint8_t usart1_tx_buffer[] = "usart transfer by interrupt: usart1 using interrupt";
- //uint8_t usart2_rx_buffer[USART1_TX_BUFFER_SIZE];
- //volatile uint8_t usart2_tx_counter = 0x00;
- volatile uint8_t usart1_tx_counter = 0x00;
- //volatile uint8_t usart2_rx_counter = 0x00;
- volatile uint8_t usart1_rx_counter = 0x00;
- //uint8_t usart2_tx_buffer_size = USART2_TX_BUFFER_SIZE;
- uint8_t usart1_tx_buffer_size = USART1_TX_BUFFER_SIZE;
- uint8_t usart1_rx_buffer_size = USART1_RX_BUFFER_SIZE;
- int main(void)
- {
- /* add user code begin 1 */
- /* add user code end 1 */
- /* system clock config. */
- wk_system_clock_config();
- /* config periph clock. */
- wk_periph_clock_config();
- /* nvic config. */
- wk_nvic_config();
- /* timebase config. */
- wk_timebase_init();
- /* init usart1 function. */
- wk_usart1_init();
- /* init gpio function. */
- wk_gpio_config();
- /* add user code begin 2 */
- /* add user code end 2 */
- while(1)
- {
-
- /* add user code begin 3 */
- if((usart1_rx_counter>=4)&&(usart1_rx_buffer[0]=='s')&&(usart1_rx_buffer[1]=='e')&&(usart1_rx_buffer[2]=='n')&&(usart1_rx_buffer[3]=='d'))
- {
- int i =0;
-
-
- gpio_bits_reset(led4_GPIO_PORT, led4_PIN);
- gpio_bits_reset(led2_GPIO_PORT, led2_PIN | led3_PIN);
- wk_delay_ms(100);//DelayMs(1000);
-
- gpio_bits_set(led4_GPIO_PORT, led4_PIN);
- gpio_bits_set(led2_GPIO_PORT, led2_PIN | led3_PIN);
- wk_delay_ms(100);//DelayMs(1000);
- usart1_tx_counter=0;
- for(i =0;i<usart1_tx_buffer_size;i++)
- {
- usart_data_transmit(USART1, usart1_tx_buffer[usart1_tx_counter++]);
- wk_delay_ms(1);
- }
- usart1_rx_counter=0;
- usart1_rx_buffer[0]=0;
- usart1_rx_buffer[1]=0;
- usart1_rx_buffer[2]=0;
- usart1_rx_buffer[3]=0;
- }
- /* add user code end 3 */
- }
- }
5，编译调试。
6，测试OK。
| 
楼主
