/** * \brief Test physical loop-back with some characters in sunc mode. * * This function sends a character over USART on loop back to verify that init * and sending/receiving works. A jumper is connected on the USART. * * \param test Current test case. */ static void run_loopback_syncmode_test(const struct test_case *test) { uint8_t out_c = 'c'; uint8_t in_c = 0; port_pin_t sck_pin; sysclk_enable_module(POWER_RED_REG0, PRUSART0_bm); usart_set_mode(&CONF_UNIT_USART, USART_CMODE_SYNCHRONOUS_gc); sck_pin = IOPORT_CREATE_PIN(PORTE, 2); ioport_configure_port_pin(ioport_pin_to_port(sck_pin), ioport_pin_to_mask(sck_pin), IOPORT_DIR_OUTPUT | IOPORT_INIT_HIGH ); usart_spi_set_baudrate(&CONF_UNIT_USART, CONF_UNIT_BAUDRATE, sysclk_get_source_clock_hz()); usart_tx_enable(&CONF_UNIT_USART); usart_rx_enable(&CONF_UNIT_USART); usart_putchar(&CONF_UNIT_USART, out_c); in_c = usart_getchar(&CONF_UNIT_USART); test_assert_true(test, in_c == out_c, "Read character through sync mode is not correct: %d != %d", in_c, out_c); }
/** * \brief Initialize USART in SPI master mode. * * This function initializes the USART module in SPI master mode using the * usart_spi_options_t configuration structure and CPU frequency. * * \param usart The USART module. * \param opt The RS232 configuration option. */ void usart_init_spi(USART_t *usart, const usart_spi_options_t *opt) { usart->UBRR = 0; usart_enable_module_clock(usart); usart_set_mode(usart, USART_CMODE_MSPI_gc); if (opt->spimode == 1 || opt->spimode == 3) { usart->UCSRnC |= USART_UCPHA_bm; } else { usart->UCSRnC &= ~USART_UCPHA_bm; } if (opt->spimode == 2 || opt->spimode == 3) { usart->UCSRnC |= USART_UCPOL_bm; } else { usart->UCSRnC &= ~USART_UCPOL_bm; } if (opt->data_order) { usart->UCSRnC |= USART_DORD_bm; } else { usart->UCSRnC &= ~USART_DORD_bm; } usart_spi_set_baudrate(usart, opt->baudrate, sysclk_get_source_clock_hz()); usart_tx_enable(usart); usart_rx_enable(usart); }
/** * \brief Initialize USART in RS232 mode. * * This function initializes the USART module in RS232 mode using the * usart_rs232_options_t configuration structure and CPU frequency. * * \param usart The USART module. * \param opt The RS232 configuration option. * * \retval true if the initialization was successful * \retval false if the initialization failed (error in baud rate calculation) */ bool usart_init_rs232(USART_t *usart, const usart_rs232_options_t *opt) { bool result; usart_enable_module_clock(usart); usart_set_mode(usart, USART_CMODE_ASYNCHRONOUS_gc); usart_format_set(usart, opt->charlength, opt->paritytype, opt->stopbits); result = usart_set_baudrate(usart, opt->baudrate, sysclk_get_source_clock_hz()); usart_tx_enable(usart); usart_rx_enable(usart); return result; }
/** * \brief Initialize USART in SPI master mode. * * This function initializes the USART module in SPI master mode using the * usart_spi_options_t configuration structure and CPU frequency. * * \param usart The USART module. * \param opt The RS232 configuration option. */ void usart_init_spi(USART_t *usart, const usart_spi_options_t *opt) { usart->UBRR = 0; usart_enable_module_clock(usart); usart_set_mode(usart, USART_CMODE_MSPI_gc); port_pin_t sck_pin; #ifdef USARTA0 if ((uintptr_t)usart == (uintptr_t)&UCSR0A) { sck_pin = IOPORT_CREATE_PIN(PORTE, 2); ioport_configure_port_pin(ioport_pin_to_port(sck_pin), ioport_pin_to_mask(sck_pin), IOPORT_DIR_OUTPUT | IOPORT_INIT_HIGH ); } #endif #ifdef USARTA1 if ((uintptr_t)usart == (uintptr_t)&UCSR1A) { sck_pin = IOPORT_CREATE_PIN(PORTD, 5); ioport_configure_port_pin(ioport_pin_to_port(sck_pin), ioport_pin_to_mask(sck_pin), IOPORT_DIR_OUTPUT | IOPORT_INIT_HIGH ); } #endif if (opt->spimode == 1 || opt->spimode == 3) { usart->UCSRnC |= USART_UCPHA_bm; } else { usart->UCSRnC &= ~USART_UCPHA_bm; } if (opt->spimode == 2 || opt->spimode == 3) { usart->UCSRnC |= USART_UCPOL_bm; } else { usart->UCSRnC &= ~USART_UCPOL_bm; } if (opt->data_order) { usart->UCSRnC |= USART_DORD_bm; } else { usart->UCSRnC &= ~USART_DORD_bm; } usart_spi_set_baudrate(usart, opt->baudrate, sysclk_get_source_clock_hz()); usart_tx_enable(usart); usart_rx_enable(usart); }