Доброго времени суток. Прошерстил темки, но решения своей проблемы не нашел. А суть вот в чем: пытаюсь разобраться с аппаратным twi, использую atmega32a, wh1601a и ds1338, как видно из темы. С дисплеем разобрался, а вот с часами не смог. Пытаюсь вытащить секунды из rtc и вывести их на дисплей. Скурил море даташитов и прочитал кучу статей, но данных из rtc добиться не смог. Привожу код ниже, помогите найти ошибку пожалуйста. В МК совсем плох, но активно осваиваю.
| Код |
/*
* display.c
*
* Created: 09.07.2013 11:28:44
* Author: George Yarmak
*/
#define F_CPU 1600000
#define F_SCL 10000
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
// ds1338 defines
#define ds_address 11010000
#define TWI_START 0
#define TWI_RESTART 1
#define TWI_STOP 2
#define TWI_TRANSMIT 3
#define TWI_RECEIVE_ACK 4
#define TWI_RECEIVE_NACK 5
//LCD Port defines
#define LCD_DDR DDRA
#define LCD_OUT PORTA
#define LCD_IN PINA
#define E 2
#define RW 1
#define RS 0
#define D7 7
#define D6 6
#define D5 5
#define D4 4
#define SetBit(reg, bit) reg |= (1<<bit)
#define ClearBit(reg, bit) reg &= (~(1<<bit))
#define InvBit(reg, bit) reg ^= (1<<bit)
#define BitIsSet(reg, bit) ((reg & (1<<bit)) != 0)
#define BitIsClear(reg, bit) ((reg & (1<<bit)) == 0)
void LCD4Char(uint8_t ch)
{
LCD_OUT=(ch&0b11110000);
LCD_OUT|=1<<RS;
LCD_OUT|=1<<E;
_delay_ms(2);
LCD_OUT&=~(1<<E);
LCD_OUT&=~(1<<RS);
_delay_ms(2);
LCD_OUT=((ch&0b00001111)<<4);
LCD_OUT|=1<<RS;
LCD_OUT|=1<<E;
_delay_ms(2);
LCD_OUT&=~(1<<E);
LCD_OUT&=~(1<<RS);
_delay_ms(2);
}
void LCD4_cmd(uint8_t cmd)
{
LCD_OUT=(cmd&0b11110000);
LCD_OUT|=1<<E;
_delay_ms(2);
LCD_OUT&=~(1<<E);
_delay_ms(2);
LCD_OUT=((cmd&0b00001111)<<4);
LCD_OUT|=1<<E;
_delay_ms(2);
LCD_OUT&=~(1<<E);
_delay_ms(2);
}
void LCD_cmd(uint8_t cmd)
{
LCD_OUT=cmd;
SetBit(LCD_OUT,E);
_delay_ms(2);
ClearBit(LCD_OUT,E);
_delay_ms(2);
}
void LCD4_init(void)
{
LCD_DDR=(1<<E)|(1<<RS)|(1<<RW)|(1<<D7)|(1<<D6)|(1<<D5)|(1<<D4);
_delay_ms(40);
//function set 0 //8-bit
LCD_cmd(0b000110000);
//function set 1 //8-bit
LCD_cmd(0b000110000);
//function set 2 //set 4-bit mode
LCD4_cmd(0b00100000);
//function set 3 //4-bit mode
LCD4_cmd(0b00100000);
//display on //set blink cursor
LCD4_cmd(0b00001100);
//display clear
LCD4_cmd(0b00000001);
//entry mode set
LCD4_cmd(0b00000010);
}
void twi_init(void)
{
TWBR=(F_CPU/F_SCL-16)/2;
TWSR=0x00;
TWDR = 0xFF; // Default content = SDA released.
TWCR = 0;
TWCR = (1<<TWEN)|(0<<TWIE)|(0<<TWINT)|(0<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
}
uint8_t TWI(uint8_t action){
switch(action){
case TWI_START:
case TWI_RESTART:
TWCR = _BV(TWSTA) | _BV(TWEN) | _BV(TWINT);// | _BV(TWIE);
break;
case TWI_STOP:
TWCR = _BV(TWSTO) | _BV(TWEN) | _BV(TWINT);// | _BV(TWIE);
break;
case TWI_TRANSMIT:
TWCR = _BV(TWEN) | _BV(TWINT);// | _BV(TWIE);
break;
case TWI_RECEIVE_ACK:
TWCR = _BV(TWEN) | _BV(TWINT) | _BV(TWEA);//| _BV(TWIE);
break;
case TWI_RECEIVE_NACK:
TWCR = _BV(TWEN) | _BV(TWINT);// | _BV(TWIE);
break;
}
if(action != TWI_STOP)while (!(TWCR & _BV(TWINT)));
return (TWSR & 0xF8);
}
unsigned char TWI_Transceiver_Busy( void )
{
while (!(TWCR & (1<<TWINT))); //Wait for TWINT Flag set. This indicates that the START condition has been transmitted
}
int main(void)
{
twi_init();
LCD4_init();
uint8_t sec;
while(1)
{
//TWI_Transceiver_Busy(); // Wait until TWI is ready for next transmission.
TWI(TWI_START); //start
TWDR=ds_address; //target device address (ds1338)
TWI(TWI_TRANSMIT); //transmit
TWI(TWI_RECEIVE_ACK);
TWI_Transceiver_Busy(); // Wait until TWI is ready for next transmission.
TWDR=0x00; //seconds address in table
TWI(TWI_TRANSMIT); //transmit
TWI(TWI_RECEIVE_ACK);
TWI_Transceiver_Busy(); // Wait until TWI is ready for next transmission.
TWI(TWI_RESTART); //restart
TWDR=ds_address & 1; //target device address (ds1338)
TWI(TWI_TRANSMIT); //transmit
TWI_Transceiver_Busy(); // Wait until TWI is ready for next transmission.
//twi(TWI_RECEIVE_ACK); //form ACK
//sec=TWDR; //take byte of seconds ds1338
TWI(TWI_RECEIVE_NACK); //form NACK (don't need more data)
sec = TWDR; //take last byte of seconds ds1338
TWI(TWI_STOP); //stop
LCD4_cmd(0b00000010);
LCD4Char(0b00110000 | (sec & 00001111));
LCD4Char(0b00110000 | (sec>>4));
_delay_ms(10000);
}
}
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