spi_dac.h
[syntax=c]/*****************************
* file name: spi_dac.h
*****************************/
#ifndef SPI_DAC_H
#define SPI_DAC_H
#include <stdint.h>
/* Initialize MCU pins for SPI master operation */
void SPI_MasterInit(void);
/* Transmit one byte of data over SPI as master */
void SPI_MasterTransmit(uint8_t SPI_Data);
/* Send 10-bit data to the DAC */
void SPI_DAC(uint16_t DAC_Data);
#endif[/syntax]
spi_dac.c
[syntax=c]/*****************************
* file name: spi_dac.c
*****************************/
#include <avr/io.h>
#include <stdint.h>
#include "SPI_DAC.h"
//strobe "pin" on "port" high
#define IO_PIN_STROBE_HIGH(port, pin) \
__asm__ __volatile__ ( \
"sbi %0, %1" \
: /* no output */ \
: "I" (_SFR_IO_ADDR(port)), \
"I" (pin))
//strobe "pin" on "port" low
#define IO_PIN_STROBE_LOW(port, pin) \
__asm__ __volatile__ ( \
"cbi %0, %1" \
: /* no output */ \
: "I" (_SFR_IO_ADDR(port)), \
"I" (pin))
/* SPI port and pin name definition */
#define DDR_SPI DDRC
#define SS PC6
#define SCK PC1
#define MOSI PC0
//#define MISO PB3
/* Strobe SS high and low */
#define SS_SET() IO_PIN_STROBE_HIGH(PORTC, 6)
#define SS_CLR() IO_PIN_STROBE_LOW(PORTC, 6)
/* Initialize MCU pins for SPI master operation */
void SPI_MasterInit(void)
{
/*
* Set SS, SCK and MOSI as output, MISO is
* automatically set as input in SPI master
*/
DDR_SPI |= (1<<SS)|(1<<SCK)|(1<<MOSI);
/* SS is active low, so init to 1 */
SS_SET();
/* Enable SPI, Master, set clock rate fck/4 */
SPCR = (1<<SPE)|(1<<MSTR);
}
/* Transmit one byte of data over SPI as master */
void SPI_MasterTransmit(uint8_t SPI_Data)
{
/* Start transmission */
SPDR = SPI_Data;
/* Wait for transmission complete */
while(!(SPSR & (1<<SPIF)))
;
}
/* Send 10-bit data to the DAC */
void SPI_DAC(uint16_t DAC_Data)
{
/* Condition the data, two LSB 0's, four MSB dummy bits */
DAC_Data = DAC_Data << 2;
/* Send conditioned data to DAC in two bytes, MSB first */
SS_CLR();
SPI_MasterTransmit((uint8_t)(DAC_Data>>8));
SPI_MasterTransmit((uint8_t)DAC_Data);
SS_SET();
}[/syntax]
Ale nie wiem czy dobrze przerobiłem SPI sprzętowe na programowe (czy wystarczyło tylko zmienić zdefiniowane piny z
[syntax=c]#define DDR_SPI DDRB
#define SS PB0
#define SCK PB1
#define MOSI PB2
#define MISO PB3[/syntax]
na
[syntax=c]/* SPI port and pin name definition */
#define DDR_SPI DDRC
#define SS PC6
#define SCK PC1
#define MOSI PC0[/syntax]
[syntax=c]main.c
/*
* main.c
*
* Created on: 2013-12-01
* Author: B&M
*/
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <stdint.h>
#include <stdio.h>// Biblioteka dla funkcji printf
#include "UART/uart.h"
#include "TERMINAL/term.h"
#include "DAC_SPI/spi_dac.h"
uint16_t test;
int main(void)
{
SPI_MasterInit();
uart_init( __UBRR ); // inicjalizacja UART
tr_cls(); //skasuj ekran
tr_cursor_hide(); //ukryj kursor
tr_locate(1,1);
tr_pen_color(WHITE);
uart_puts("TEST UKŁADU DAC TLC 5615");
while(1)
{
SPI_DAC(1020);
}
}[/syntax]
teraz co dalej wykonać w pliku main.c aby sprawdzić układ DAC w mojej konfiguracji płytki testowej(rysunek powyżej w pierwszym poście.Statystyki: Napisane przez mirek1968 — 12 sty 2014, o 15:15
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