USART driver for AVR XMEGA.
This file contains basic functions for the AVR XMEGA USART, with support for all modes, settings and clock speeds.
Copyright (c) 2009-2018 Microchip Technology Inc. and its subsidiaries.
Data Structures | |
| struct | usart_rs232_options |
| Input parameters when initializing RS232 and similar modes. More... | |
| struct | usart_spi_options |
| Input parameters when initializing SPI master mode. More... | |
Macros | |
| #define | USART_BAUD_1200 0x00 |
| Offset in lookup table for baudrate 1200. More... | |
| #define | USART_BAUD_19200 0x04 |
| Offset in lookup table for baudrate 19200. More... | |
| #define | USART_BAUD_2400 0x01 |
| Offset in lookup table for baudrate 2400. More... | |
| #define | USART_BAUD_38400 0x05 |
| Offset in lookup table for baudrate 38400. More... | |
| #define | USART_BAUD_4800 0x02 |
| Offset in lookup table for baudrate 4800. More... | |
| #define | USART_BAUD_57600 0x06 |
| Offset in lookup table for baudrate 57600. More... | |
| #define | USART_BAUD_9600 0x03 |
| Offset in lookup table for baudrate 9600. More... | |
| #define | USART_BAUD_UNDEFINED 0xFF |
| Baudrate not in lookup table. More... | |
Typedefs | |
| typedef struct usart_rs232_options | usart_rs232_options_t |
| Input parameters when initializing RS232 and similar modes. More... | |
| typedef struct usart_spi_options | usart_spi_options_t |
| Input parameters when initializing SPI master mode. More... | |
Enumerations | |
| enum | usart_int_level_t { USART_INT_LVL_OFF = 0x00, USART_INT_LVL_LO = 0x01, USART_INT_LVL_MED = 0x02, USART_INT_LVL_HI = 0x03 } |
| USART interrupt levels. More... | |
Functions | |
| static | PROGMEM_DECLARE (uint16_t, baudctrl_2mhz[]) |
| Lookup table containing baudctrl values for CPU frequency 2 Mhz. More... | |
| static | PROGMEM_DECLARE (uint16_t, baudctrl_32mhz[]) |
| Lookup table containing baudctrl values for CPU frequency 32 Mhz. More... | |
| static void | usart_clear_rx_complete (USART_t *usart) |
| Clear RX complete interrupt flag. More... | |
| static void | usart_clear_tx_complete (USART_t *usart) |
| Clear TX complete interrupt flag. More... | |
| static bool | usart_data_register_is_empty (USART_t *usart) |
| Check if data register empty flag is set. More... | |
| static void | usart_format_set (USART_t *usart, USART_CHSIZE_t charSize, USART_PMODE_t parityMode, bool twoStopBits) |
| Configure the USART frame format. More... | |
| static uint8_t | usart_get (USART_t *usart) |
| Read a data to the USART data register. More... | |
| uint8_t | usart_getchar (USART_t *usart) |
| Receive a data with the USART module. More... | |
| bool | usart_init_rs232 (USART_t *usart, const usart_rs232_options_t *opt) |
| Initialize USART in RS232 mode. More... | |
| void | usart_init_spi (USART_t *usart, const usart_spi_options_t *opt) |
| Initialize USART in SPI master mode. More... | |
| static void | usart_put (USART_t *usart, uint8_t txdata) |
| Write a data to the USART data register. More... | |
| enum status_code | usart_putchar (USART_t *usart, uint8_t c) |
| Send a data with the USART module. More... | |
| static void | usart_rx_disable (USART_t *usart) |
| Disable USART receiver. More... | |
| static void | usart_rx_enable (USART_t *usart) |
| Enable USART receiver. More... | |
| static bool | usart_rx_is_complete (USART_t *usart) |
| Checks if the RX complete interrupt flag is set. More... | |
| bool | usart_set_baudrate (USART_t *usart, uint32_t baud, uint32_t cpu_hz) |
| Set the baudrate value in the USART module. More... | |
| void | usart_set_baudrate_precalculated (USART_t *usart, uint32_t baud, uint32_t cpu_hz) |
| Set the baudrate using precalculated BAUDCTRL values from PROGMEM. More... | |
| void | usart_set_bsel_bscale_value (USART_t *usart, uint16_t bsel, uint8_t bscale) |
| Set the baudrate by setting the BSEL and BSCALE values in the USART. More... | |
| static void | usart_set_dre_interrupt_level (USART_t *usart, enum usart_int_level_t level) |
| Set USART DRE interrupt level. More... | |
| static void | usart_set_mode (USART_t *usart, USART_CMODE_t usartmode) |
| Set the mode the USART run in. More... | |
| static void | usart_set_rx_interrupt_level (USART_t *usart, enum usart_int_level_t level) |
| Set USART RXD interrupt level. More... | |
| static void | usart_set_tx_interrupt_level (USART_t *usart, enum usart_int_level_t level) |
| Set USART TXD interrupt level. More... | |
| void | usart_spi_set_baudrate (USART_t *usart, uint32_t baud, uint32_t cpu_hz) |
| Set the baudrate value in the USART_SPI module. More... | |
| static uint8_t | usart_spi_transmit (USART_t *usart, uint8_t txdata) |
| Performs a data transfer on the USART in SPI mode. More... | |
| static void | usart_tx_disable (USART_t *usart) |
| Disable USART transmitter. More... | |
| static void | usart_tx_enable (USART_t *usart) |
| Enable USART transmitter. More... | |
| static bool | usart_tx_is_complete (USART_t *usart) |
| Checks if the TX complete interrupt flag is set. More... | |
1.8.5