usart_serial_example_pdca.c File Reference

USART Serial example for SAM.

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

#include <string.h>
#include <asf.h>
#include "conf_board.h"
#include "conf_clock.h"
#include "conf_example.h"

Macros
#define	ALL_INTERRUPT_MASK   0xffffffff
	All interrupt mask. More...
#define	BUFFER_SIZE   100
	Size of the receive buffer used by the PDCA, in bytes. More...
#define	MAX_BUF_NUM   1
	Max buffer number. More...
#define	PDCA_RX_CHANNEL   0
#define	PDCA_TX_CHANNEL   1
#define	STRING_EOL   "\r"
#define	STRING_HEADER
#define	TC_FREQ   10
	Timer counter frequency in Hz. More...

Functions
static void	configure_console (void)
	Configure UART for debug message output. More...
static void	configure_tc (void)
	Configure Timer Counter 0 (TC0) to generate an interrupt every 200ms. More...
int	main (void)
	Application entry point for usart_serial example. More...
void	TC00_Handler (void)
	Interrupt handler for TC00. More...
void	USART_Handler (void)
	Interrupt handler for USART. More...

Variables
static uint8_t	g_uc_transend_flag = 0
	Flag of one transfer end. More...
static uint8_t	gs_puc_buffer [2][BUFFER_SIZE]
	Receive buffer. More...
static uint8_t	gs_puc_nextbuffer [2][BUFFER_SIZE]
	Next Receive buffer. More...
static uint8_t	gs_uc_buf_num = 0
	Buffer number in use. More...
static uint32_t	gs_ul_size_buffer = BUFFER_SIZE
	Current bytes in buffer. More...
static uint32_t	gs_ul_size_nextbuffer = BUFFER_SIZE
	Current bytes in next buffer. More...
pdca_channel_config_t	pdca_rx_options
	PDCA channel options. More...
pdca_channel_config_t	pdca_tx_options

#define ALL_INTERRUPT_MASK   0xffffffff

All interrupt mask.

#define BUFFER_SIZE   100

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

Referenced by TC00_Handler(), and USART_Handler().

#define MAX_BUF_NUM   1

Max buffer number.

Referenced by USART_Handler().

#define PDCA_RX_CHANNEL   0

Referenced by main(), TC00_Handler(), and USART_Handler().

#define PDCA_TX_CHANNEL   1

Referenced by main(), and USART_Handler().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

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

Referenced by main().

#define TC_FREQ   10

Timer counter frequency in Hz.

Referenced by configure_tc().

static void configure_console ( void  )

static

Configure UART for debug message output.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, and stdio_serial_init().

Referenced by main().

static void configure_tc ( void  )

static

Configure Timer Counter 0 (TC0) to generate an interrupt every 200ms.

This interrupt will be used to flush USART input and echo back.

References sysclk_enable_peripheral_clock(), sysclk_get_peripheral_bus_hz(), tc_enable_interrupt(), tc_find_mck_divisor(), TC_FREQ, tc_init(), and tc_write_rc().

Referenced by main().

int main

(

void

)

Application entry point for usart_serial example.

Returns

Unused (ANSI-C compatibility).

References board_init(), BOARD_USART, configure_console(), configure_tc(), pdca_channel_enable(), pdca_channel_set_config(), pdca_enable(), PDCA_RX_CHANNEL, PDCA_TX_CHANNEL, STRING_HEADER, sysclk_init(), tc_start(), usart_enable_interrupt(), and USART_IRQn.

void TC00_Handler

(

void

)

Interrupt handler for TC00.

Record the number of bytes received, and then restart a read transfer on the USART if the transfer was stopped.

References BUFFER_SIZE, g_uc_transend_flag, gs_puc_buffer, gs_puc_nextbuffer, gs_uc_buf_num, gs_ul_size_buffer, gs_ul_size_nextbuffer, pdca_channel_read_load_size(), pdca_channel_read_reload_size(), pdca_channel_write_load(), pdca_channel_write_reload(), PDCA_RX_CHANNEL, and tc_get_status().

void USART_Handler

(

void

)

Interrupt handler for USART.

Echo the bytes received and start the next receive.

References BOARD_USART, BUFFER_SIZE, g_uc_transend_flag, gs_puc_buffer, gs_puc_nextbuffer, gs_uc_buf_num, gs_ul_size_buffer, gs_ul_size_nextbuffer, MAX_BUF_NUM, pdca_channel_write_load(), pdca_channel_write_reload(), PDCA_RX_CHANNEL, PDCA_TX_CHANNEL, tc_start(), tc_stop(), and usart_get_status().

uint8_t g_uc_transend_flag = 0

static

Flag of one transfer end.

Referenced by TC00_Handler(), and USART_Handler().

uint8_t gs_puc_buffer[2][BUFFER_SIZE]

static

Receive buffer.

Referenced by TC00_Handler(), and USART_Handler().

uint8_t gs_puc_nextbuffer[2][BUFFER_SIZE]

static

Next Receive buffer.

Referenced by TC00_Handler(), and USART_Handler().

uint8_t gs_uc_buf_num = 0

static

Buffer number in use.

Referenced by TC00_Handler(), and USART_Handler().

uint32_t gs_ul_size_buffer = BUFFER_SIZE

static

Current bytes in buffer.

Referenced by TC00_Handler(), and USART_Handler().

uint32_t gs_ul_size_nextbuffer = BUFFER_SIZE

static

Current bytes in next buffer.

Referenced by TC00_Handler(), and USART_Handler().

pdca_channel_config_t pdca_rx_options

Initial value:

= {
    .addr = (void *)gs_puc_buffer, 
    .pid = PDCA_PID_USART_RX, 
    .size = BUFFER_SIZE, 
    .r_addr = (void *)gs_puc_nextbuffer, 
    .r_size = BUFFER_SIZE, 
    .transfer_size = PDCA_MR_SIZE_BYTE, 
    .etrig = false, 
    .ring = false 
}

PDCA channel options.

pdca_channel_config_t pdca_tx_options

Initial value:

= {
    .addr = (void *)gs_puc_buffer, 
    .pid = PDCA_PID_USART_TX, 
    .size = 0, 
    .r_addr = (void *)gs_puc_nextbuffer, 
    .r_size = 0, 
    .transfer_size = PDCA_MR_SIZE_BYTE, 
    .etrig = false, 
    .ring = false 
}