hwa/atmel/avr/examples/11-2-uart-twi-24cxx/main.c

This is a variation of 11-1-uart-twi-eeprom that uses the HW_24CXX() object.

main.c

 
/*  This file is part of the HWA project.
 *  Copyright (c) 2019 Christophe Duparquet.
 *  All rights reserved. Read LICENSE.TXT for details.
 */
 
#include <stdio.h>
#include <stdlib.h>
 
#include BOARD_H
 
#include <hwa/ext/24cxx.h>
 
#define TWI                     twi0
 
#define DEBUG 1
 
#define EEPROM                  HW_24CXX ( interface,   TWI,    \
                                           address,     0x50,   \
                                           addresssize, 2,      \
                                           pagesize,    8 )
 
HW_DECLARE(EEPROM);
HW_IMPLEMENT(EEPROM);
 
 
/*
 * Note [6]
 * Send character c down the UART Tx, wait until tx holding register
 * is empty.
 */
int
uart_putchar(char c, FILE *unused __attribute__((unused)) )
{
  if (c == '\n')
    uart_putchar('\r',0);
 
  while ( !hw(stat,uart0).txqnf ) {}
  hw( write, uart0, c );
  
  return 0;
}
 
 
FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
 
const char msg[] = "The quick brown fox jumps over the lazy dog." ;
 
int
main(void)
{
  uint16_t a;
  uint8_t rv;
  uint8_t b[16];
  uint8_t x;
 
  hwa( begin, reset );
  hwa( configure,   uart0,
       bps,         9600,
       receiver,    disabled,
       transmitter, enabled  );
  hwa( configure, TWI, bps, 100000 );
  hwa( commit );
 
  stdout = &mystdout;
 
  for (a = 0; a < 256;) {
    printf("%#04x: ", a);
    rv = hw( read,    EEPROM,
             address, a,
             size,    16,
             buffer,  b);
    if (rv < 16)
      printf("warning: short read %d\n", rv);
    a += rv;
    for (x = 0; x < rv; x++)
      printf("%02x ", b[x]);
    putchar('\n');
  }
 
  rv = hw( write,   EEPROM,
           address, 55,
           size,    sizeof(msg)/sizeof(*msg)-1,
           buffer,  msg );
  if (rv < sizeof(msg)/sizeof(*msg)-1)
    printf("warning: short write %d\n", rv);
 
  printf("Wrote %d bytes.\n", rv);
 
  for (a = 0; a < 256;) {
    printf("%#04x: ", a);
    rv = hw( read,    EEPROM,
             address, a,
             size,    16,
             buffer,  b );
    if (rv < 16)
      printf("warning: short read %d\n", rv);
    a += rv;
    for (x = 0; x < rv; x++)
      printf("%02x ", b[x]);
    putchar('\n');
  }
 
  printf("done.\n");
  return 0;
}