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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Tue Mar 18, 2008 2:52 pm |
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| Post your latest test program. |
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boulder
Joined: 15 Mar 2008
Posts: 53
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| Posted: Tue Mar 18, 2008 6:31 pm |
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Here is my latest code:
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#include "16F886.h"
#include <stdio.h>
#use delay(clock=2000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#fuses INTRC, NOWDT, PUT, MCLR, NOPROTECT, NOCPD, NOBROWNOUT, NOIESO, NOFCMEN, NOLVP, NOWRT
int8 i=0;
int8 Sendtab[6]={0x10,0x26,0x00,0x00,0x00,0x00};
int8 Receivetab[6];
void main()
{
setup_oscillator( OSC_2MHZ );
output_high(PIN_C3);
output_high(PIN_C5);
output_high(PIN_B5);
setup_spi(SPI_MASTER | SPI_L_TO_H | SPI_XMIT_L_TO_H | SPI_CLK_DIV_16);
output_low(PIN_B5); //Slave Select
for(i=0;i<6;i++)
Receivetab[i] = spi_read(Sendtab[i]);
output_high(PIN_B5);
for(i=0;i<6;i++)
printf("%x\n",Receivetab[i]); //Print out data
printf("%x\n",*(0x14)); //SSPCON
printf("%x\n",*(0x94)); //SSPSTAT
printf("%x\n\n",*(0x13)); //SSPBUF
while(1);
}
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I am expecting 6 received data from slave, 0xC1, 0xC2, 0X4E, 0X41, 0x39 and 0x35. But all data is 0x00. SSPCON value is 0x21, SSPSTAT is 0x40, and SSPBUF is 0. One thing I don't understand is that I can see received data from slave on an oscilloscope, but the reading from pickit serial is 0.
Thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 18, 2008 7:11 pm |
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The data sheet says you must have a delay of 25 us after each byte.
You don't have the delay in your code. I suggested this in a previous
post. See the 2nd paragraph in the left column on page 14 of the Maxim
data sheet.
I also suggested that you insert a delay of 100 ms at the start of your
program, to give the Maxim chip time to finish any internal reset or
initialization process. |
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boulder
Joined: 15 Mar 2008
Posts: 53
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| Posted: Tue Mar 18, 2008 8:22 pm |
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I just tried it, and it still does not work. Here is my latest code:
| Code: |
#include "16F886.h"
#include <stdio.h>
#use delay(clock=2000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#fuses INTRC, NOWDT, PUT, MCLR, NOPROTECT, NOCPD, NOBROWNOUT, NOIESO, NOFCMEN, NOLVP, NOWRT
int8 i=0;
int8 Sendtab[6]={0x10,0x26,0x00,0x00,0x00,0x00};
int8 Receivetab[6];
void main()
{
delay_ms(100);
setup_oscillator( OSC_2MHZ );
output_high(PIN_C3);
output_high(PIN_C5);
output_high(PIN_B5);
setup_spi(SPI_MASTER | SPI_L_TO_H | SPI_XMIT_L_TO_H | SPI_CLK_DIV_16);
output_low(PIN_B5); //Slave Select
for(i=0;i<6;i++)
{
Receivetab[i] = spi_read(Sendtab[i]);
delay_us(25);
}
output_high(PIN_B5);
for(i=0;i<6;i++)
printf("%x\n",Receivetab[i]); //Print out data
printf("%x\n",*(0x14)); //SSPCON
printf("%x\n",*(0x94)); //SSPSTAT
printf("%x\n\n",*(0x13)); //SSPBUF
while(1);
}
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I still read the same value, 0x00, and I still can see 6 clocked in data on an oscilloscope. I used ST's arm7 as master one week ago and it was successful with the same settings and logic.
Thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 18, 2008 8:35 pm |
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Do you have a short program, written in C source code, for the ARM7 ?
If so, post it. Or if it's on the net, then post a link to it. |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue Mar 18, 2008 8:59 pm |
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| Quote: | | One thing I don't understand is that I can see received data from slave on an oscilloscope, but the reading from pickit serial is 0. |
If I understand the MAXQ3180 correctly then it will start sending a 0xC1 byte as soon as it is selected and gets clock pulses. So even if the PIC is not sending any valid data the MAXQ3180 will respond with some data. The PIC only receiving '0' is strange. It could be the SPI-mode is wrong, but you already tried all 4 combinations... Just to make sure, can you tell us which pin numbers of the PIC are connected to what pin numbers of the MAXQ3180? |
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boulder
Joined: 15 Mar 2008
Posts: 53
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| Posted: Tue Mar 18, 2008 9:08 pm |
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Here is my ST ARM7 code, the chi STR712.
| Code: |
#include "71x_lib.h"
int main (void)
{
u8 Sendtab[6]={0x10,0x26,0x00,0x00,0x00,0x00};
u8 Receivetab[6];
u8 i=0, x, z;
u16 j;
/*-------------------------------------------------------------------------
Check Different Clock, expect every clock is 2MHZ.
--------------------------------------------------------------------------*/
u32 MCLKval;
u32 APB1CLKval;
u32 APB2CLKval;
#ifdef DEBUG
debug();
#endif
MCLKval=RCCU_FrequencyValue (RCCU_MCLK);
APB1CLKval=RCCU_FrequencyValue (RCCU_FCLK);
APB2CLKval=RCCU_FrequencyValue (RCCU_PCLK);
printf("%i %i %i \n", MCLKval,APB1CLKval, APB2CLKval);
APB_ClockConfig( APB1, ENABLE, BSPI1_Periph ) ;
/* ---------------------------------------------------------------------------------------
Configure Pin Ports
--------------------------------------------------------------------------------------- */
GPIO_Config (GPIO1, 0x0001<<8, GPIO_OUT_PP);
GPIO_Config (GPIO0, 0x00FF, GPIO_AF_PP);
GPIO_BitWrite(GPIO1, 8, 1); //Slave Select
/* -------------------------------------------
Configure BSPI1 as a Master
------------------------------------------- */
/* Initialize BSPI0 */
BSPI_Init ( BSPI1 ) ;
/* Configure Baud rate Frequency: ---> APB1/16 */
BSPI_ClockDividerConfig ( BSPI1,16); //Get 125kHz spi speed
/* Enable BSPI0 */
BSPI_Enable ( BSPI1 , ENABLE );
/* Configure BSPI0 as a Master */
BSPI_MasterEnable ( BSPI1,ENABLE);
/* Configure the clock to be inactive high */
BSPI_ClkActiveHigh(BSPI1,DISABLE);
/* Disable capturing the first Data sample on the first edge of SCK */
BSPI_ClkFEdge(BSPI1,DISABLE);
/* Set the word length to 8 bit */
BSPI_8bLEn(BSPI1,ENABLE);
/* Configure the depth of transmit to 6 bytes */
BSPI_TrFifoDepth(BSPI1,6);
/* Point on the word to transit */
BSPI_RcFifoDepth(BSPI1,6);
/* ---------------------------------------------
Send and read 6 bytes of buffer
--------------------------------------------- */
GPIO_BitWrite(GPIO1, 8, 0);
for(i=0;i<6;i++)
{
BSPI_WordSend(BSPI1, Sendtab[i]);
while(BSPI_FlagStatus(BSPI1, BSPI_TFE)==RESET); //Check if transmit buffer empty
while(BSPI_FlagStatus(BSPI1, BSPI_RFNE)==RESET); //Check if receive buff full
Receivetab[i] = BSPI_WordReceive(BSPI1);
}
GPIO_BitWrite(GPIO1, 8, 1);
for(i=0;i<6;i++) //Print out data
printf("Data%i = %x\n", i, Receivetab[i]);
while (1);
}
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I wonder if the PCM library function has a bug because I can see 6 correct clocked in data from slave on oscilloscope, but they becomes 0x00 on pickit serial. |
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boulder
Joined: 15 Mar 2008
Posts: 53
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| Posted: Wed Mar 19, 2008 9:59 am |
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I just figured out why 6 clocked in data is 0x00. It's because I am using Pickit Serial which has impedance. One of Pickit Serial pins is connected SPI_DI pin, pin_C4, it causes clocked in data signal voltage level below 2 volts by impedance. That's why I always read 0x00 on Pickit Serial display but see correct data bits on oscilloscope with low level voltage at the same time. After removing Pickit Serial, clocked in data signal is normal, LEDs shows all 6 clocked in data is read correctly.
Thanks. |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Wed Mar 19, 2008 10:34 am |
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Glad you found the cause of the problems. This is one of those bang-your-head-against-wall moments.
| Quote: | | One of Pickit Serial pins is connected SPI_DI pin |
Just wondering which Pickit pin you had connected and why? To me none of the Pickit pins does seem as a logical candidate for this connection. |
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boulder
Joined: 15 Mar 2008
Posts: 53
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| Posted: Wed Mar 19, 2008 11:03 am |
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| Pickit's pin4 is connected to SDI, and pin5 is connected to SCK. I did not connected them, the demo board is designed this way. If you look at 28-pin Demo board schematic on USER's GUIDE, you will know what I mean. I should have read the schematic first. |
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Sarada
Joined: 02 Jun 2008
Posts: 2
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| Posted: Fri Jul 04, 2008 5:15 am |
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hi all i just started using the Maxq3180 IC can anybody please post the circuit for the IC.
Thanks in advance |
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