Post by thread:[PIC]: page boundary on wave generator

part 1 2270 bytes content-type:text/plain; charset=iso-8859-1; format=flowedHi all PIClisters I tryed to build a wave generator PIC16F84 based. The entire system is an impedance meter. As you know we can study the system by it's response to a Fourier series. I've mixed at least 5 waves with different amplitudes and fase shift, bla, bla, bla... All of this look like: PIC(wave generator) => DAC0808 (8bits) => I/V converter => transducer Everything is ok with DAC till transducer. My real problem is to use a table in PIC to put values on PORTB. My table assumes 512 samples with 8bit lenght(256 levels). I use the PICLIST/math to help me with long tables that crosses page boundary. Everything is fine on MPLAB, the two tables can be easily read, but in real world it doesn't work at all!!! For the first time I use a simple rising and falling ramp to test, as you can see in the attached program, but in the scope the signal was splitted and the second table wasn't read ! In the program memory, there are at least one page crossing for each table. table1: start address: 0x0053 one page boundary crossing at 0x0100 end address: 0x0154 table2 start address: 0x0155 one page boundary crossing at 0x0200 end address: 0x0244 The main program do: - pick a value on the table - wait for a tmr0 tick - put the value on portB - do it all 256 times for table1 - repeat the process to the table2 - do it all above for ever... With the scope I saw a saw-tooth like this: - - ---1,5 V (maximum value) - | - | - | - | - | - | - | - | - | - | - | - | - - There is a problem with this signal. The real maximum value is 2,00V (end of scale for ADC), but the value showed is 1,5 (75%). So, there is a crack on the table presentation, I thougth that is caused by page boundary crossing, am I right ??? And where is the table2 (falling ramp) presentation??? The table2 wasn't showed !!! Please, can someone help me to solve the mistery??? I appreciate any suggestions... Eduardo Lopes. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. part 2 15135 bytes content-type:text/plain; name="gerador3.asm"; format=flowed (unknown type 8bit not decoded) list p=16f84 include p16f84a.inc __config _wdt_off & _xt_osc & _pwrte_on & _cp_off cblock 0x0c contador ;samples counter timerl ;samples interval salva ;a safe place to the samples ajuste ;correction for 390us between samples multiplicador ;number of interactions flag ;sample's status endc ok equ 0 ;sample catched escrito equ 1 ;sample written org 0 goto inicio org 4 bcf intcon, T0IF ;limpa o flag de interrugco incfsz TIMERL ;incrementa o contador inferior retfie ;ainda nco contou valor total movf ajuste, w ;corregco de tempo movwf tmr0 ;(grava tmr0) teste btfss flag, ok ;testa se o valor novo ja foi lido retfie ;valor antigo, nco envia movf salva, w ;pega o valor a ser escrito movwf portb ;escreve o valor na porta de saida bsf flag, escrito ;avisa que ja foi escrito btfss porta, 1 ;pulsa RA1 em cada nivel - RA1 toggle goto pulo ;de sinal de saida bcf porta, 1 goto continua pulo bsf porta, 1 continua movf multiplicador, w ;2 iteragues 1*256 + 1* 134 = 390 us movwf timerl movf contador, w ;testa se contador = 0 btfss status, z ;ss acende a cada 512 amostras - RA0 toggle retfie ; btfss porta, 0 goto sai bcf porta, 0 retfie sai bsf porta, 0 retfie ;================================================= ;PIC setup time ;================================================= inicio clrf status bsf status, rp0 movlw b'11011000' ;clock=>wdt ;prescaler=> wdt / 4 (who cares???) ; pull-ups enabled movwf option_reg movlw b'11111100' movwf trisa clrf trisb ;portB all outputs bcf status, rp0 movwf portb clrf tmr0 movlw 130 ;130 means 389us movwf ajuste movlw 254 movwf multiplicador movwf timerl clrf flag bsf intcon, t0ie ;enable tmr0 interruptions bsf intcon, gie ;======================================================== ;TABLE READER ;PICK A VALUE ON THE TABLE AND PUT ON THE SALVA REGISTER ; ;TABLE'S LENGTH = 256 ;WITH THESE VALUES WE SHOULD GET A RAMP ON THE DAC ;======================================================== reseta_cont1 clrf contador loop1 ;===================== ;THERE IS A PCLATH CORRECTION FOR PAGES BOUNDARY ;SUGGESTED ON THE PICLIST MATH TABLES ;I THINK THAT IT ISN'T WORKING ON THE REAL WORLD! ; ;PLEASE, CAN SOMEONE TEACH ME THE RIGHT THING? ;=============================================== movlw high(tabela1) ;pega o valor byte alto de enderego movwf pclath ;e carrega no pclath movf contador,w ;pega o valor de indice addlw tabela1 ;e verifica se ultrapassa a tabela skpnc incf pclath, f movf contador, w call tabela1 ;chama a tabela e ;============== ;SAVE THE SAMPLE ON THE 'SALVA' REGISTER AND WAIT FOR TMR0 TICKS ;============== movwf salva ; salva o valor da amostra bsf flag, ok ;avisa que o valor esta pronto btfss flag, escrito ;verifica se a porta foi escrita goto $ - 1 ;leva 390us entre amostras bcf flag, escrito ; bcf flag,ok ;indica nco pronto, ati termos incfsz contador, f ;a proxima amostra ;DO IT ALL AGAIN TILL 256 SAMPLES goto loop1 ;================ ;DO THE SAME FOR NEXT 256 SAMPLES ;================ reseta_cont2 clrf contador loop2 movlw high(tabela2) ;pega o valor byte alto de enderego movwf pclath ;e carrega no pclath movf contador,w ;pega o valor de indice addlw tabela2 ;e verifica se ultrapassa a tabela skpnc incf pclath, f movf contador, w call tabela2 movwf salva bsf flag, ok ;avisa que o valor esta pronto btfss flag, escrito ;verifica se a porta foi escrita goto $ - 1 ;leva 976us entre amostras bcf flag, escrito ; bcf flag,ok ;indica nco pronto, ati termos incfsz contador, f goto loop2 goto reseta_cont1 ;================================ tabela1 addwf pcl, f retlw 0 retlw 1 retlw 2 retlw 3 retlw 4 retlw 5 retlw 6 retlw 7 retlw 8 retlw 9 retlw 10 retlw 11 retlw 12 retlw 13 retlw 14 retlw 15 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