[Atmel] SAML21走起26:SERCOM 串口中断方式

#include <asf.h>

#include <stdio.h>



void usart_read_callback(struct usart_module *const usart_module);

void usart_write_callback(struct usart_module *const usart_module);



void configure_usart(void);

void configure_usart_callbacks(void);



//! [module_inst]

struct usart_module usart_instance;

//! [module_inst]



//! [rx_buffer_var]

#define MAX_RX_BUFFER_LENGTH   5



volatile uint8_t rx_buffer[MAX_RX_BUFFER_LENGTH];

//! [rx_buffer_var]



//! [callback_funcs]

void usart_read_callback(struct usart_module *const usart_module)

{

        usart_write_buffer_job(&usart_instance,

                        (uint8_t *)rx_buffer, MAX_RX_BUFFER_LENGTH);

}



void usart_write_callback(struct usart_module *const usart_module)

{

        port_pin_toggle_output_level(LED_0_PIN);

}

//! [callback_funcs]



//! [setup]

void configure_usart(void)

{

//! [setup_config]

        struct usart_config config_usart;

//! [setup_config]

//! [setup_config_defaults]

        usart_get_config_defaults(&config_usart);

//! [setup_config_defaults]



//! [setup_change_config]

        config_usart.baudrate    = 9600;

        config_usart.mux_setting = EDBG_CDC_SERCOM_MUX_SETTING;

        config_usart.pinmux_pad0 = EDBG_CDC_SERCOM_PINMUX_PAD0;

        config_usart.pinmux_pad1 = EDBG_CDC_SERCOM_PINMUX_PAD1;

        config_usart.pinmux_pad2 = EDBG_CDC_SERCOM_PINMUX_PAD2;

        config_usart.pinmux_pad3 = EDBG_CDC_SERCOM_PINMUX_PAD3;

//! [setup_change_config]



//! [setup_set_config]

        while (usart_init(&usart_instance,

                        EDBG_CDC_MODULE, &config_usart) != STATUS_OK) {

        }

//! [setup_set_config]



//! [setup_enable]

        usart_enable(&usart_instance);

//! [setup_enable]

}



void configure_usart_callbacks(void)

{

//! [setup_register_callbacks]

        usart_register_callback(&usart_instance,

                        usart_write_callback, USART_CALLBACK_BUFFER_TRANSMITTED);

        usart_register_callback(&usart_instance,

                        usart_read_callback, USART_CALLBACK_BUFFER_RECEIVED);

//! [setup_register_callbacks]



//! [setup_enable_callbacks]

        usart_enable_callback(&usart_instance, USART_CALLBACK_BUFFER_TRANSMITTED);

        usart_enable_callback(&usart_instance, USART_CALLBACK_BUFFER_RECEIVED);

//! [setup_enable_callbacks]

}

//! [setup]



int main(void)

{

        system_init();



//! [setup_init]

        configure_usart();

        configure_usart_callbacks();

//! [setup_init]



//! [main]

//! [enable_global_interrupts]

        system_interrupt_enable_global();

//! [enable_global_interrupts]



//! [main_send_string]

        uint8_t string[] = "Hello World!\r\n";

        usart_write_buffer_wait(&usart_instance, string, sizeof(string));

//! [main_send_string]



//! [main_loop]

        while (true) {

//! [main_loop]

//! [main_read]

                usart_read_buffer_job(&usart_instance,

                                (uint8_t *)rx_buffer, MAX_RX_BUFFER_LENGTH);

//! [main_read]

        }

//! [main]

}