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andys
Joined: 23 Oct 2006
Posts: 175
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| i2c, spi comunication |
 Posted: Fri Jul 06, 2012 7:29 pm |
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I want to create communication (using i2c protocol) between pic and a sensor. (The pic is the slave) it will take the values from the sensor.
My problem is that: if I use 2 pics then one is programmed as slave and the other as master, now in the communication with pic and sensor if I program only the pic as slave is ok?????
Furthermore I want to write data to an external memory with SPI, how to do it???
Thanks in advance. |
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temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
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| Posted: Sat Jul 07, 2012 5:11 am |
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1) There are several great examples that CCS supplies in the 'examples' folder. You should look and read each of them to see what is applicable to your project.
2) Always include the PIC type and compiler version when posting a question.You'll get faster, more detailed replies than a 'general' question.
3) Also ,include the peripheral device information as well,in your case the SPI bussed 'external memory'.Again, CCS supplies working example code for probably 99% of the chips you'll use.
4) Search this forum as well as the 'code library' for relevent posts. A lot of code has been submitted to these forums !! |
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andys
Joined: 23 Oct 2006
Posts: 175
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| i2c, spi comunication |
| Posted: Sat Jul 07, 2012 4:53 pm |
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I create a code in which i read values from (adc converter) and I use spi protocol to write these values to an external flash memory (m25p40).
Also I need my data to be able to transmit over rs232.
I have a lot of problems. Is anyone how can help me. I use dspic33 microcontroller. The code is presented below:
| Code: |
#include <33FJ128GP708.h>
#FUSES NOWDT
#FUSES HS
#FUSES NOPROTECT
#FUSES NOJTAG
#FUSES NODEBUG
#FUSES NOIESO
#use delay(clock=80000000,crystal=12000000)
#use rs232(stream=string,baud=9600,xmit=PIN_B1,RCV=PIN_B2,parity = N, bits=8)
#use SPI(DI=PIN_F7,DO=PIN_F8,CLK=PIN_F6,BITS=10 )
#define memory_select PIN_G4
main()
{
int32 temp_value;
int32 data_i2c;
SET_TRIS_A(0XFF);
SET_TRIS_B(0XFF);
setup_adc_ports(sAN1);
setup_adc(ADC_CLOCK_DIV_8);
setup_spi(SPI_SLAVE|SPI_H_TO_L|SPI_CLK_DIV_4);
for(;;)
{
temp_value=read_adc(sAN2);
delay_us(10);
spi_write(temp_value);
delay_us(10);
}
return 0;
}
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Sat Jul 07, 2012 7:43 pm |
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Just as a side note, is the external flash just meant as a buffer of sorts or is it for more permanent storage?
I ask only because I'm wondering if you've checked the write endurance of the FLASH you're using.
Cheers,
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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andys
Joined: 23 Oct 2006
Posts: 175
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| i2c, spi comunication |
| Posted: Mon Jul 09, 2012 12:54 pm |
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The flash is for more permanent storage. How to check the write endurance of the flash???
Also how to change my code? |
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