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mjdale2003
Joined: 10 Oct 2004
Posts: 21
Location: UK
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| 18f27j13 usart problem |
 Posted: Wed Aug 05, 2015 3:10 am |
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Hi,
I can't seem to get either usart to work on this device and some help would be greatly appreciated.
Uart1 does not work at all and uart2 locks the processor up.
In the code there is dataCounter and dataCounter2 both of which do not change.
I have scoped both rx pins and they have valid signals on them.
Compiler version is 5.044
Setup code is
| Code: |
#include "18F27J13.h"
#Device PASS_STRINGS=IN_RAM
#ZERO_RAM
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES NOSTVREN //Stack full/underflow will not cause reset
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PLLEN //4X HW PLL enabled
#FUSES INTRC_PLL_IO //Internal RC Osc with 4X PLL, no CLKOUT
#FUSES NOCLOCKOUT
#FUSES SOSC_DIG //Digital mode, I/O port functionality of RC0 and RC1
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NODSBOR //BOR disabled in Deep Sleep
#FUSES NODSWDT //Deep Sleep Watchdog Timer disabled
#FUSES NOIOL1WAY //Allows multiple reconfigurations of peripheral pins
//#OPT 9
#use delay(crystal=16M,clock=16M)
#pin_select U2RX=PIN_B7
#pin_select U2TX=PIN_B6
#use rs232(baud=9600,parity=N,bits=8,ERRORS,UART1)
#use rs232(baud=9600,parity=N,bits=8,ERRORS,UART2)
#use fast_io(A)
#use fast_io(B)
#use fast_io(C)
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and
| Code: |
void init(void)
{
port_B_pullups(0xFF);
TRISA = 0b11010000;// a0 a1 a2 a3 relays
TRISB = 0b10000111;// b0 b1 b2 buttons b4 tx_en
TRISC = 0b10000000;// c0 lcd reset c1 lcd_cs c3 sck c5 sdi c6 txd1 c7 rxd1
ANSELB = 0x00; // All digital
ANSELC = 0x00; // All digital
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
delay_ms(1000);
///////////////////////////////////
//Start with everything disabled
///////////////////////////////////
setup_oscillator(OSC_16MHZ|OSC_NORMAL|OSC_PLL_OFF);
setup_timer_0(T0_OFF);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DIV_BY_16, 157, 16);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_timer_4(T4_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_ccp1(CCP_OFF);
setup_ccp2(CCP_OFF);
setup_ccp3(CCP_OFF);
setup_ccp4(CCP_OFF);
setup_ccp5(CCP_OFF);
// setup_dac(DAC_OFF);
setup_adc(ADC_OFF | NO_ANALOGS);
setup_adc_ports(NO_ANALOGS|VSS_VDD);
///////////////////////////////////
// was mode 0
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_16 );
enable_interrupts(INT_RDA);
enable_interrupts(INT_RDA2);
enable_interrupts(INT_TBE);
enable_interrupts(INT_TBE2);
enable_interrupts(periph);
enable_interrupts(GLOBAL);
// for now force txen to on
DE1 = 1;// Transmit pin enabled usart1 high is enabled
RE1 = 0;// Receive pin enabled usart1 low ie enabled
DE1 = 1;// Transmit pin enabled usart2 high is enabled
RE2 = 0;// Receive pin enabled usart2 low ie enabled
// register enables
TXEN = 1;
TXEN2 = 1;
}
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interrupt code
| Code: |
#INT_RDA
void rx_handler(void)
{
unsigned char temp;
dataCounter++;
if(RCSTA & 0x06){ // If an error has occured, old code produces an error
temp = RCREG; // dummy read to clear usart rx buffer
temp = RCREG; // dummy read to clear usart rx buffer
temp = RCREG; // dummy read to clear usart rx buffer - done 3 times to clear FIFO
CREN = 0; // Clear the error
CREN = 1; // Enable the port to recieve
}
else{
rxBuf[rxRecPtr] = RCREG;
rxRecPtr++;
rxRecPtr &= RX_BUFF_SIZE; // Enforce buffer circularity
//dataCounter++;
}
}
#INT_RDA2
void rx_handler2(void)
{
unsigned char temp;
dataCounter2++;
if(RCSTA2 & 0x06){ // If an error has occured, this produces an error
temp = RCREG2; // dummy read to clear usart rx buffer
temp = RCREG2; // dummy read to clear usart rx buffer
temp = RCREG2; // dummy read to clear usart rx buffer - done 3 times to clear FIFO
CREN2 = 0; // Clear the error
CREN2 = 1; // Enable the port to recieve
}
else{
rxBuf2[rxRecPtr2] = RCREG2; // Read the recieve regester
rxRecPtr2++;
rxRecPtr2 &= RX_BUFF_SIZE; // Enforce buffer circularity
packetCount++;
}
}
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mjdale2003
Joined: 10 Oct 2004
Posts: 21
Location: UK
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| Posted: Wed Aug 05, 2015 3:24 am |
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| Updated the compiler to v5.048 but the problem is still there |
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mjdale2003
Joined: 10 Oct 2004
Posts: 21
Location: UK
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| Posted: Wed Aug 05, 2015 3:43 am |
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Changed fuses to
| Code: |
#fuses HS,NODEBUG,NOXINST,NOPROTECT,NOWDT,NOCLOCKOUT,NOIOL1WAY,NOWPCFG,NOWPFP
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but still no change. The processor is running as i have an oled printing the values of other variables one of which is being xored once a second in the main loop |
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mjdale2003
Joined: 10 Oct 2004
Posts: 21
Location: UK
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| Posted: Wed Aug 05, 2015 3:54 am |
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| i have looked in the list file and there is no reference RPOR10, RPOR9 or address ECA, EC9 which is where i would expect the #pin_select to be doing something |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
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| Posted: Wed Aug 05, 2015 4:04 am |
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First rid of your enable_interrupts on the two TBE interrupts.
The point is that TBE, is _always_ true, until you actually start sending data. It says 'my buffer is empty I want to send something'. This will always be true when the chip starts. You should never enable INT_TBE, until you have data to actually send.
Look at how ex_stisr.c does it. INT_TBE is _not_ enabled, till the routine to send data is called. It then saved the data to the buffer, and enables the interrupt. In the interrupt handler if data is available, it loads it. If not, it disables the interrupt.
INT_TBE (and 2), needs to always be disabled, unless you are sending data. Depending on how your handler is written it might recover, but otherwise it'll hang the chip.
Then simplify. We can't have even a remote hope of knowing what your code is doing, because it is incomplete, but we are not going to wade through loads of code. If you have a UART problem, write a small (<50line) program that just sets up the two UART's, and attempts to use both. It needs to be something complete so we can compile it.
The odds are that when you write this you find what the problem actually is.
Honestly you code is 'half CCS', You enable CCS to handle UART errors for you, but then don't use the CCS code to do this. You have CCS code to set the analogs to all off, but also set the registers yourself. 'Belt and braces' is not good in code. It is likely to lead to things not being really set how you expect. |
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onuruygur
Joined: 17 Jul 2009
Posts: 7
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| Posted: Wed Aug 05, 2015 9:55 am |
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| it seems not be related with uarts. you may check the timings and the interrupts. locking of the cpu generally occurs by the timing or looping interrupts or deadly resets. |
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