ultramodul srf08 mit diesem programm lesen
hallo, wer kann helfen das ultramodul srf08 i2c mit diesem programm auszulesen.
ich habe da kompasmodul geschafft und ein eeprom 24c256, aber das ultramodul schaffe ich nicht.
ich weiss nicht woran es liegt.
Code:
kompasmodul cmps03 auslesen mit dieser routine,funktioniert 100%:
int main (void)
{
char s[10];
uint16_t wert_1;
uint8_t buffer_r[4];
usart_init( (READ + WRITE) , READ);
i2cInit(100000);
for (;;) {
i2cMemRead(192, 0, buffer_r, 4);
wert_1=buffer_r[2]*256;
wert_1=wert_1+buffer_r[3]; // wert_1 ist gradzahl * 10
itoa( wert_1, s, 10);
usart_writeString(s);
usart_writeString("\r");
warte(20000);
}
}
i2c-eeprom 24c256 beschreiben und lesen geht 100%,
5 werte werden geschrieben und ausgelesen an adresse 26777:
int main(void)
{
lcd_init(LCD_DISP_ON);
lcd_clrscr();
i2cInit(100000);
uint8_t output[8];
uint8_t buffer_w [8];
uint8_t buffer_r [8];
uint8_t i;
buffer_w [0] = 77;
buffer_w [1] = 76;
buffer_w [2] = 75;
buffer_w [3] = 74;
buffer_w [4] = 73;
i2cMemWrite(0xA0, 26777, buffer_w, 5, 0);
warte(2000);
i2cMemRead(0xA0, 26777, buffer_r, 5);
for (i = 0; i < 5; i++) {
itoa(buffer_r[i],output,10);
lcd_puts(output);
lcd_putc(' ');
warte(2000);
}
}
die i2c.h :
#include <avr/io.h>
#include <compat/twi.h>
#ifndef i2c_H
#define i2c_H
#ifdef XTAL
#define TWI_TWBR(baudrate) (uint8_t)(((XTAL + baudrate -1) / baudrate - 15.0) / 2.0)
#else
#define TWI_TWBR(baudrate) (uint8_t)(((8000000 + baudrate -1) / baudrate - 15.0) / 2.0)
#endif
#define i2cInit(baudrate) {TWBR = TWI_TWBR(baudrate);}
// follow functions retuns always i2cStatus() == TWSR == TWI Status register
extern uint8_t i2cStart(void);
extern uint8_t i2cStop(void); // deactivate TWI !!
extern uint8_t i2cStatus(void); // returns TWSR status register
extern uint8_t i2cWait(void); // same as i2cStatus() but wait for current action ready
extern uint8_t i2cWrite(uint8_t Value);
// resceive a byte, returns resceived Byte, transmit acknowledge dependend of Ack
extern uint8_t i2cRead(uint8_t Ack);
// select EEPROM with hardware address Device, setup memory address to Address, and if Wait != 0 waits eventually for prior
// written bytes to finish. returns != 0 if all operations success, otherwise returns 0.
extern uint8_t i2cMemSelect(uint8_t Device, uint16_t Address, uint8_t Wait);
// write from Source, Count bytes to memory location at Address on EEPROM Device. If FlashStored != 0 Source points to
// programmemory. Returns count of succesfully bytes written.
extern uint16_t i2cMemWrite(uint8_t Device, uint16_t Address, const uint8_t *Source, uint16_t Count, uint8_t FlashStored);
// read from EEPROM Device at memory location Address Count bytes to Dest. Returns count of successfully bytes read.
extern uint16_t i2cMemRead(uint8_t Device, uint16_t Address, const uint8_t *Dest, uint16_t Count);
#endif
die i2c.S, asm routine :
nolist
#include <avr/io.h>
#include <compat/twi.h>
.list
#ifndef EEPROM_ADDRESS_BYTES
#define EEPROM_ADDRESS_BYTES 2 // set to 1 for 1 byte memory address
#endif
#ifndef EEPROM_PAGE_SIZE
#define EEPROM_PAGE_SIZE 64 // page size of i2c eeprom chip
#endif
#define EERPOM_PAGE_MASK EEPROM_PAGE_SIZE -1
#define SANITY_CHECKS 1 // activate some sanity checks, set to 0 to save 12 bytes
#define FAST_READ 1 // activate buffering of current memory address
// ATTENTION! this can work if only one i2c eeprom chip is connected
#define P0L r24
#define P0H r25
#define P1L r22
#define P1H r23
#define P2L r20
#define P2H r21
#define P3L r18
#define P3H r19
#define P4L r16
#define P4H r17
#define TMP r0
#define ZERO r1
.macro out_ port value
.if (_SFR_IO_ADDR(\port) > 63)
sts \port, \value
.else
out _SFR_IO_ADDR(\port), \value
.endif
.endm
.macro in_ value port
.if (_SFR_IO_ADDR(\port) > 63)
lds \value, \port
.else
in \value, _SFR_IO_ADDR(\port)
.endif
.endm
.section .text
.global i2cStart // uint8_t i2cStart(void);
.global i2cWait // uint8_t i2cWait(void);
.global i2cStatus // uint8_t i2cStatus(void);
.global i2cWrite // uint8_t i2cWrite(uint8_t Value);
.global i2cStop // uint8_t i2cStop(void);
.global i2cRead // uint8_t i2cRead(uint8_t Ack);
i2cStart: ldi P0L, (1 << TWEN) | (1 << TWINT) | (1 << TWSTA)
i2cStart1: out_ TWCR, P0L
i2cWait: in_ P0L, TWCR
sbrs P0L, TWINT
rjmp i2cWait
i2cStatus: in_ P0L, TWSR
andi P0L, 0xF8
cp P0L, P0H // P0H hidden parameter to save some code
ldi P0H, 0 // P0H = 0, zeroize result, but preserve flags !
ret
i2cWrite: out_ TWDR, P0L
ldi P0L, (1 << TWEN) | (1 << TWINT)
rjmp i2cStart1
i2cStop: ldi P0L, (1 << TWEN) | (1 << TWINT) | (1 << TWSTO)
out_ TWCR, P0L
ldi P0L, 14 // small wait loop before deactivation of TWI
i2cStop1: dec P0L
brne i2cStop1
out_ TWCR, P0L // P0L already 0
rjmp i2cStatus
i2cRead: tst P0L
breq i2cRead1
ldi P0L, (1 << TWEA)
i2cRead1: ori P0L, (1 << TWEN) | (1 << TWINT)
out_ TWCR, P0L
rcall i2cWait
in_ P0L, TWDR
ret
// 56 bytes
#if FAST_READ == 1
.section .data
i2cAddress: .word 0xFFFF
#endif
.section .text
.global i2cMemSelect // uint8_t i2cMemSelect(uint8_t Device, uint16_t Address, uint8_t Wait);
.global i2cMemWrite // uint16_t i2cMemWrite(uint8_t Device, uint16_t Address, uint16_t Source, uint16_t Count, uint8_t FlashStored);
.global i2cMemRead // uint16_t i2cMemRead(uint8_t Device, uint16_t Address, uint16_t Dest, uint16_t Count);
i2cMemSelect: // P0 Device, P1 Address, P2 Wait
mov TMP, P0L // save device
clt // T flag == wait state
tst P2L
breq i2cMemSelect2
i2cMemSelect1:
set
i2cMemSelect2:
rcall i2cStop
rcall i2cStart
mov P0L, TMP // device
andi P0L, 0xFE
ldi P0H, TW_MT_SLA_ACK
rcall i2cWrite
breq i2cMemSelect3
brts i2cMemSelect2 // wait until ready
rjmp i2cMemSelect4
i2cMemSelect3:
#if FAST_READ == 1
sts i2cAddress +0, P1L
sts i2cAddress +1, P1H
#endif
#if EEPROM_ADDRESS_BYTES == 2
mov P0L, P1H // hi(Address)
ldi P0H, TW_MT_DATA_ACK
rcall i2cWrite
brne i2cMemSelect5
#endif
mov P0L, P1L // lo(Address)
ldi P0H, TW_MT_DATA_ACK
rcall i2cWrite
breq i2cMemSelect5
i2cMemSelect4:
ldi P0L, 0 // result = 0
i2cMemSelect5:
ret
i2cMemWrite: // P0 Device, P1 Address, P2 Source, P3 Count, P4 FlashStored
movw ZL, P2L // Z = Source
movw P2L, P3L // Result = Count
#if SANITY_CHECKS != 0
cp P3L, ZERO // sanity check of input count > 0
cpc P3H, ZERO
breq i2cMemWrite8 // Count == 0 ??
#endif
mov TMP, P0L // save Device
clt // clear wait flag for i2cMemSelect
rjmp i2cMemWrite2
i2cMemWrite1:
mov P4H, P1L
andi P4H, EERPOM_PAGE_MASK
brne i2cMemWrite3 // (Address & 0x1F) != 0 ??
i2cMemWrite2:
rcall i2cMemSelect2
brne i2cMemWrite6
set // set wait flag for i2cMemSelect
i2cMemWrite3:
tst P4L
breq i2cMemWrite4 // if FlashStored == 0 goto load from RAM
lpm P0L, Z+
rjmp i2cMemWrite5
i2cMemWrite4:
ld P0L, Z+
i2cMemWrite5:
ldi P0H, TW_MT_DATA_ACK
rcall i2cWrite
brne i2cMemWrite6 // error on write data ??
subi P1L, lo8(-1) // Address++
sbci P1H, hi8(-1)
subi P3L, lo8(+1) // Count--
sbci P3H, hi8(+1)
brne i2cMemWrite1 // Count > 0 ??
rcall i2cMemSelect2 // wait for finishing writing to eeprom
i2cMemWrite6:
rcall i2cStop
i2cMemWrite7:
sub P2L, P3L
sbc P2H, P3H
#if FAST_READ == 1
lds P3L, i2cAddress +0
lds P3H, i2cAddress +1
add P3L, P2L
adc P3H, P2H
sts i2cAddress +0, P3L
sts i2cAddress +1, P3H
#endif
i2cMemWrite8:
movw P0L, P2L // return(Start Count - Current Count)
ret
i2cMemRead: // P0 Device, P1 Address, P2 Dest, P3 Count
movw ZL, P2L // Z = Dest
movw P2L, P3L // Result = Count
#if SANITY_CHECKS != 0
cp P3L, ZERO // sanity check of input count > 0
cpc P3H, ZERO
breq i2cMemWrite8
#endif
mov TMP, P0L // save device
#if FAST_READ == 1
lds P0H, i2cAddress +0
cp P1L, P0H
lds P0H, i2cAddress +1
cpc P1H, P0H
breq i2cMemRead1
#endif
rcall i2cMemSelect1 // setup address
brne i2cMemWrite6
i2cMemRead1:
rcall i2cStart
mov P0L, TMP
ori P0L, 1
ldi P0H, TW_MR_SLA_ACK
rcall i2cWrite
brne i2cMemWrite6
i2cMemRead2:
ldi P0L, 1 // Ack
ldi P0H, TW_MR_DATA_ACK
cpi P3L, 1
cpc P3H, ZERO
brne i2cMemRead3 // Count <> 1 ??
ldi P0L, 0 // No Ack for least byte read to activate power save mode
ldi P0H, TW_MR_DATA_NACK
i2cMemRead3:
rcall i2cRead
brne i2cMemWrite6
st Z+, P0L
subi P3L, lo8(+1) // Count--
sbci P3H, hi8(+1)
brne i2cMemRead2 // Count > 0 ??
rjmp i2cMemWrite6
// 160 bytes
#undef I2C_TWCR
#undef I2C_TWSR
#undef I2C_TWDR
#undef EEPROM_PAGE_SIZE
#undef EERPOM_PAGE_MASK
#undef EEPROM_ADDRESS_BYTES
#undef P0L
#undef P0H
#undef P1L
#undef P1H
#undef P2L
#undef P2H
#undef P3L
#undef P3H
#undef P4L
#undef P4H
#undef TMP
#undef ZERO
.end
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Hi, Pebi
so etwa würd' ich's mal probieren
Address SF08 mußt du ev. was anderes nehmen ?
"WAIT 100ms" == warte(1000) ?
die LCD Ausgabe mußt du nach deinem Geschmack ausbessern
