usart_example_dmac.c File Reference

USART DMAC Example for SAM.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

#include "asf.h"
#include "conf_example.h"

Macros
#define	BOARD_USART_DMAC_RX_CH   0
	DMAC receive channel of master. More...
#define	BOARD_USART_DMAC_TX_CH   1
	DMAC transmit channel of master. More...
#define	BUFFER_SIZE   32
	Size of the receive buffer used by the DMAC, in bytes. More...
#define	STRING_EOL   "\r"
#define	STRING_HEADER
#define	USART_RX_IDX   12
#define	USART_TX_IDX   11
	DMAC Channel HW Interface Number for USART. More...

Functions
static void	configure_console (void)
	Configure UART for debug message output. More...
static void	configure_dmac (void)
	DMAC driver configuration. More...
static void	configure_dmac_rx (void)
	DMAC rx channel configuration. More...
static void	configure_dmac_tx (void)
	DMAC tx channel configuration. More...
static void	configure_usart (void)
	Configure USART in normal (serial rs232) mode, asynchronous, 8 bits, 1 stop bit, no parity, 115200 bauds and enable its transmitter and receiver. More...
void	DMAC_Handler (void)
	DMAC interrupt handler. More...
int	main (void)
	Application entry point for usart_dmac_serial example. More...

Variables
static uint8_t	gs_puc_buffer [BUFFER_SIZE]
	Receive buffer. More...

#define BOARD_USART_DMAC_RX_CH   0

DMAC receive channel of master.

Referenced by configure_dmac(), configure_dmac_rx(), and DMAC_Handler().

#define BOARD_USART_DMAC_TX_CH   1

DMAC transmit channel of master.

Referenced by configure_dmac_tx().

#define BUFFER_SIZE   32

Size of the receive buffer used by the DMAC, in bytes.

Referenced by configure_dmac_rx(), and configure_dmac_tx().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"-- USART DMAC Serial Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

#define USART_RX_IDX   12

Referenced by configure_dmac_rx().

#define USART_TX_IDX   11

DMAC Channel HW Interface Number for USART.

Referenced by configure_dmac_tx().

static void configure_console ( void  )

static

Configure UART for debug message output.

References uart_rs232_options::baudrate, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

static void configure_dmac ( void  )

static

DMAC driver configuration.

References BOARD_USART_DMAC_RX_CH, dmac_enable(), dmac_enable_interrupt(), dmac_init(), DMAC_PRIORITY_ROUND_ROBIN, dmac_set_priority_mode(), and pmc_enable_periph_clk().

Referenced by main().

static void configure_dmac_rx ( void  )

static

DMAC rx channel configuration.

References BOARD_USART_DMAC_RX_CH, BUFFER_SIZE, dmac_channel_disable(), dmac_channel_enable(), dmac_channel_set_configuration(), dmac_channel_single_buf_transfer_init(), gs_puc_buffer, dma_transfer_descriptor_t::ul_ctrlA, dma_transfer_descriptor_t::ul_ctrlB, dma_transfer_descriptor_t::ul_descriptor_addr, dma_transfer_descriptor_t::ul_destination_addr, dma_transfer_descriptor_t::ul_source_addr, and USART_RX_IDX.

Referenced by DMAC_Handler(), and main().

static void configure_dmac_tx ( void  )

static

DMAC tx channel configuration.

References BOARD_USART_DMAC_TX_CH, BUFFER_SIZE, dmac_channel_disable(), dmac_channel_enable(), dmac_channel_set_configuration(), dmac_channel_single_buf_transfer_init(), gs_puc_buffer, dma_transfer_descriptor_t::ul_ctrlA, dma_transfer_descriptor_t::ul_ctrlB, dma_transfer_descriptor_t::ul_descriptor_addr, dma_transfer_descriptor_t::ul_destination_addr, dma_transfer_descriptor_t::ul_source_addr, and USART_TX_IDX.

Referenced by DMAC_Handler().

static void configure_usart ( void  )

static

Configure USART in normal (serial rs232) mode, asynchronous, 8 bits, 1 stop bit, no parity, 115200 bauds and enable its transmitter and receiver.

References sysclk_enable_peripheral_clock(), sysclk_get_peripheral_hz(), usart_enable_rx(), usart_enable_tx(), and usart_init_rs232().

Referenced by main().

void DMAC_Handler

(

void

)

DMAC interrupt handler.

References BOARD_USART_DMAC_RX_CH, configure_dmac_rx(), configure_dmac_tx(), and dmac_get_status().

int main

(

void

)

Application entry point for usart_dmac_serial example.

Returns

Unused (ANSI-C compatibility).

References board_init(), configure_console(), configure_dmac(), configure_dmac_rx(), configure_usart(), STRING_HEADER, and sysclk_init().

uint8_t gs_puc_buffer[BUFFER_SIZE]

static

Receive buffer.

Referenced by configure_dmac_rx(), and configure_dmac_tx().