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rosiley
Joined: 29 May 2014
Posts: 18
Location: Brasil
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| Problem with two max7219 |
 Posted: Mon Apr 25, 2016 6:10 pm |
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Good evening everyone.
I have a question here that I can not solve.
I am using two MAX7219, the first triggering 5 7-segment display showing the value of channel 0 and the second MAX7219 showing channel 1 pic. How should I do the scheduling ? Follows the code.
I can not do the second MAX7219 for the value of channel 1.
| Code: |
#include <18F4553.h> // Includes header file PIC 18F4553
#device ADC = 12 //Sets 12 bits for the result of the AD conversion
#use delay (clock=20000000) /*Set the frequency of the crystal to calculate
..of delays */
#use spi(do=pin_D0,clk=pin_D2,bits=16,load_active=1,load=pin_D1,idle=1, stream=MAX1)
#use spi(do=pin_C0,clk=pin_C2,bits=16,load_active=1,load=pin_C1,idle=1, stream=MAX2)
//bits control configuration
#fuses HS
#fuses NOWDT
#fuses PUT
#fuses BROWNOUT
#fuses NOLVP
// It shows the value of the AD converter
int32 hc1, hc2;
// It shows the value of Conversion
int32 hc1result;
int32 hc2result;
// The bits to display configuration in the 7-segment display
int address, data, adqnum, digit[5];
int16 packetmax;
// Packet transmission via spi to the max
void maxsend(int8 channel)
{ //routine for send information to the max
packetmax=make16(address,data); //make a 16 bit variable direcc byte high, dato byte low
if(channel == 1)
spi_xfer(MAX1, packetmax); //transfer using spi software
if(channel == 2)
spi_xfer(MAX2, packetmax);
}
// Configuration properties MAX7219
void maxsetup()
{
// Initialize the first MAX7219. The channel parameter = 1.
address=0x00, data=0x00, maxsend(1); // No-Operation
address=0x09, data=0xff, maxsend(1); // Decode-Mode Register Examples (Address (Hex) = 0xX9)
address=0x0a, data=0x0f, maxsend(1); // Intensity Register Format (Address (Hex) = 0xXA)
address=0x0b, data=0x05, maxsend(1); // Scan-Limit Register Format (Address (Hex) = 0xXB)
address=0x0f, data=0x01, maxsend(1); // Display-Test Register Format(Address (Hex) = 0xXF)
address=0x0c, data=0x01, maxsend(1); // Shutdown Register Format (Address (Hex) = 0xXC)
// Initialize the second MAX7219. The channel parameter = 2.
address=0x00, data=0x00, maxsend(2); // No-Operation
address=0x09, data=0xff, maxsend(2); // Decode-Mode Register Examples (Address (Hex) = 0xX9)
address=0x0a, data=0x0f, maxsend(2); // Intensity Register Format (Address (Hex) = 0xXA)
address=0x0b, data=0x05, maxsend(2); // Scan-Limit Register Format (Address (Hex) = 0xXB)
address=0x0f, data=0x01, maxsend(2); // Display-Test Register Format(Address (Hex) = 0xXF)
address=0x0c, data=0x01, maxsend(2); // Shutdown Register Format (Address (Hex) = 0xXC)
}
// The following lines are used for the digits
void algebra_digits()
{
// Initialize the first line 7 segments display.. The channel parameter = 1.
digit[0] = hc1result/1000;
digit[1] = ((hc1result % 1000)*10)/1000;
digit[2] = ((((hc1result % 1000)*10) % 1000)*10)/1000;
digit[3] = ((((((hc1result % 1000)* 10) % 1000) * 10) % 1000 )* 10) / 1000;
digit[4] = ((((((((hc1result % 1000)* 10) % 1000) * 10) % 1000) * 10) % 1000)* 10) / 1000;
// Initialize the second line 7 segments display. The channel parameter = 2.
digit[0] = hc2result/1000;
digit[1] = ((hc2result % 1000)*10)/1000;
digit[2] = ((((hc2result % 1000)*10) % 1000)*10)/1000;
digit[3] = ((((((hc2result % 1000)* 10) % 1000) * 10) % 1000 )* 10) / 1000;
digit[4] = ((((((((hc2result % 1000)* 10) % 1000) * 10) % 1000) * 10) % 1000)* 10) / 1000;
}
void main()
{
// Set the analog inputs AN0 to AN4
SETUP_ADC_PORTS(AN0_TO_AN4|VSS_VREF);
// Use the internal clock to the time of acquisition
SETUP_ADC(ADC_CLOCK_Internal);
// Enable global interrupt
Enable_Interrupts(GLOBAL);
// Enables interruption by receiving data in serial
Enable_Interrupts(INT_RDA);
// Enables interruption by overflow of Timer 0
ENABLE_INTERRUPTS(INT_TIMER0);
/* Set Timer 0 Prescaler to increase the machine cycle of 1 : 256 and
mode 8 bits */
SETUP_TIMER_0(RTCC_INTERNAL | RTCC_DIV_256 | RTCC_8_BIT);
// Start the Timer 0 with the value 61 - Interruption every 25ms
SET_TIMER0(61);
maxsetup();
delay_ms(3000); // Delays the start of the display
/* Makes cleaning all the rec variable and makes the controleb maga indexes 0 */
for(cont = 0; cont < 5; cont++) rec[cont] = '\0';
cont = 0;
//Main Loop
while(true)
{
for(adqnum=1;adqnum<=100;adqnum++)
{ //collect 100 samples, I usually do this, u can use your favorite method
hc1=hc1+read_adc(); //for acquisition.
delay_us(20);
hc2=hc2+read_adc(); //for acquisition.
delay_us(20);
}
hc1=hc1*10;
algebra_digits(); //call algebra routine to get each digit
address=0x01, data=(digit[0] | 0b10000000), maxsend(1); //use OR for adding decimal point
address=0x02, data=digit[1], maxsend(1);
address=0x03, data=digit[2], maxsend(1);
address=0x04, data=digit[3], maxsend(1);
address=0x05, data=digit[4], maxsend(1);
hc1=0; //clean hc1
hc2=hc2*10;
algebra_digits(); //call algebra routine to get each digit
address=0x01, data=(digit[0] | 0b10000000), maxsend(2); //use OR for adding decimal point
address=0x02, data=digit[1], maxsend(2);
address=0x03, data=digit[2], maxsend(2);
address=0x04, data=digit[3], maxsend(2);
address=0x05, data=digit[4], maxsend(2);
hc2=0; //clean hc2
SET_ADC_CHANNEL(0); //Sets the read channel 0
delay_us(100); //Channel adjustment time (required)
hc1 = READ_ADC(); //Does the AD conversion and saves it in the variable ad0
SET_ADC_CHANNEL(1); //Sets the read channel 1
delay_us(100); //Channel adjustment time (required)
hc2 = READ_ADC(); //Does the AD conversion and saves it in the variable ad1
hc1result = (hc1 * 5000) /4095;
hc2result = (hc2 * 5000) /4095;
delay_ms(100); //Delay 100ms
}
}
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Last edited by rosiley on Tue Apr 26, 2016 12:58 pm; edited 3 times in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 25, 2016 6:43 pm |
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| Quote: | | second MAX7219 showing channel 1 pic |
What do you mean by "pic" ?
Is it your 12F683 ? Or do you mean a graphic image ?
Is your second MAX7219 connected to your 12F683 ? What pins on the PIC ?
Is there only one 12F683, or are there two of them ?
I'm just trying to get some details that you didn't explain. |
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rosiley
Joined: 29 May 2014
Posts: 18
Location: Brasil
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| Posted: Mon Apr 25, 2016 6:55 pm |
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What do you mean by "pic" ?
This is my microcontroller.
Is it your 12F683 ? Or do you mean a graphic image ?
I used the pic 16f877a
Is your second MAX7219 connected to your 12F683 ?
I used two max7219 and one pic
What pins on the PIC ?
Is there only one 12F683, or are there two of them ?
This code is a example, i go used
the pic 16f877
I'm just trying to get some details that you didn't explain.
Last edited by rosiley on Mon Apr 25, 2016 7:17 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 25, 2016 7:01 pm |
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I'm not sure exactly what your problem is.
What is "channel 1" ?
- Is it the 2nd MAX7219 ?
- Is it a different ADC channel on the PIC ?
And please answer my questions from my previous reply. |
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rosiley
Joined: 29 May 2014
Posts: 18
Location: Brasil
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| Posted: Mon Apr 25, 2016 7:24 pm |
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I am using a 16F877A , the value of AN0 channel will be shown in the first max and the value of AN1 channel will be shown in the second max . I already have the value of AN0 channel being shown , only two are in max I need this figure shows only the first max .
How do I put a picture here. |
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rosiley
Joined: 29 May 2014
Posts: 18
Location: Brasil
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 25, 2016 11:59 pm |
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You are using a 16F877A, so you many i/o pins.
1. Choose 3 unused i/o pins on the 16F877A, and connect the second
MAX7219 to those pins.
2. Make a second #use spi() statement for the second MAX7219.
3. Use streams with the #use spi() statements. The first #use spi()
should have stream=MAX1 added to it. The second #use spi() should
have stream=MAX2 added to it.
Example:
Let's assume the second MAX7219 is placed on PortB. The two #use spi()
statements would be given stream names like this:
| Code: | #use spi(do=pin_a0,clk=pin_a2,bits=16,load_active=1,load=pin_a1,idle=1, stream=MAX1)
#use spi(do=pin_b0,clk=pin_b2,bits=16,load_active=1,load=pin_b1,idle=1, stream=MAX2) |
Then modify the maxsend() function to have a parameter for the channel.
If channel 1 is specified, then send SPI data to the first MAX7219. If
channel 2 is specified, then send it to the second MAX7219:
| Code: |
void maxsend(int8 channel){
packetmax=make16(address,data);
if(channel == 1)
spi_xfer(MAX1, packetmax);
if(channel == 2)
spi_xfer(MAX2, packetmax);
} |
When you call the maxsend() function, you must specify which MAX7219
chip you want to talk to. This is done with the channel parameter.
Example:
| Code: |
void maxsetup(){
// Initialize the first MAX7219. The channel parameter = 1.
address=0x00, data=0x00, maxsend(1);
address=0x09, data=0xff, maxsend(1);
address=0x0a, data=0x0f, maxsend(1);
address=0x0b, data=0x05, maxsend(1);
address=0x0f, data=0x01, maxsend(1);
address=0x0c, data=0x01, maxsend(1);
// Initialize the second MAX7219. The channel parameter = 2.
address=0x00, data=0x00, maxsend(2);
address=0x09, data=0xff, maxsend(2);
address=0x0a, data=0x0f, maxsend(2);
address=0x0b, data=0x05, maxsend(2);
address=0x0f, data=0x01, maxsend(2);
address=0x0c, data=0x01, maxsend(2);
} |
In the rest of your program, you must do the same thing. Put in the
channel parameter in maxsend() to write to the desired MAX7219 chip. |
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