SAMD21 UART SERCOM ASF

[Werner P. (Gast)]

Hallo zusammen,

bastle grad mit einem SAMD21 an der Ausgabe einer UART.

Verwende Atmel Studio 7.

#include <asf.h>

#include <stdio.h>
#include <string.h>

#define SENSOR_LEFT      PIN_PA14
#define SENSOR_RIGHT    PIN_PA09

#define LED_TEST      PIN_PA07

struct usart_module     usart_instance;

// Function Prototypes

void configure_port_pins(void);
void configure_usart(void);

// Functions

void configure_port_pins(void)
{

  struct port_config config_port_pin;

  port_get_config_defaults(&config_port_pin);

  // SENSOR LEFT
  config_port_pin.direction = PORT_PIN_DIR_INPUT;
  config_port_pin.input_pull = PORT_PIN_PULL_UP;
  port_pin_set_config(SENSOR_LEFT, &config_port_pin);
  
  // SENSOR RIGHT
  config_port_pin.direction = PORT_PIN_DIR_INPUT;
  config_port_pin.input_pull = PORT_PIN_PULL_UP;
  port_pin_set_config(SENSOR_RIGHT, &config_port_pin);

  // LED TEST
  config_port_pin.direction = PORT_PIN_DIR_OUTPUT;
  port_pin_set_config(LED_TEST, &config_port_pin);
  port_pin_set_output_level(LED_TEST,false);

}

void configure_usart(void)
{
  
  struct usart_config config_usart;
  usart_get_config_defaults(&config_usart);

  config_usart.baudrate    = 9600;
  config_usart.mux_setting = USART_RX_1_TX_0_XCK_1;
  config_usart.pinmux_pad0 = PINMUX_PA00D_SERCOM1_PAD0;
  config_usart.pinmux_pad1 = PINMUX_PA01D_SERCOM1_PAD1;
  config_usart.pinmux_pad2 = PINMUX_UNUSED;
  config_usart.pinmux_pad3 = PINMUX_UNUSED;
  config_usart.generator_source = GCLK_GENERATOR_0;
  
  while (usart_init(&usart_instance,SERCOM1, &config_usart) != STATUS_OK) {
  }

  usart_enable(&usart_instance);}

// Systick
void SysTick_Handler (void)
{
  static int flag = 0;
    
  if (flag) {
    flag = 0;
    port_pin_set_output_level(LED_TEST,false);
  } else {
    flag = 1;
    port_pin_set_output_level(LED_TEST,true);
  }
  
}

// Main
int main (void)
{
  system_init();
  
  configure_port_pins();
  configure_usart();

  SysTick_Config(SystemCoreClock/1200);
  system_interrupt_enable(SYSTEM_INTERRUPT_SYSTICK);

  uint8_t buf[] = "Hello World\r\n";
  usart_write_buffer_wait(&usart_instance, buf, sizeof(buf));

        while (true) {
        
    
  }
    
}

Bis auf die UART Ausgabe funktioniert soweit alles. Denke es liegt an 
der Konfiguration der UART.

TX = PA00, RX = PA01

Danke im voraus.

[Werner P. (Gast)]

nach etwas Suche zum Laufen gebracht.

TX = PA10
RX = PA11

neue Config:

void configure_usart(void)
{
  
  struct usart_config config_usart;
  usart_get_config_defaults(&config_usart);

  config_usart.baudrate    = 9600;
  config_usart.mux_setting = USART_RX_3_TX_2_XCK_3;
  config_usart.pinmux_pad2 = PINMUX_PA10C_SERCOM0_PAD2;
  config_usart.pinmux_pad3 = PINMUX_PA11C_SERCOM0_PAD3;
  config_usart.pinmux_pad0 = PINMUX_UNUSED;
  config_usart.pinmux_pad1 = PINMUX_UNUSED;
  config_usart.generator_source = GCLK_GENERATOR_0;
  
  while (usart_init(&usart_instance,SERCOM0, &config_usart) != STATUS_OK) {
  }

  usart_enable(&usart_instance);
}