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ralph79
Joined: 29 Aug 2007
Posts: 90
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| PICF18F26Q10 with double hardware uart |
 Posted: Wed Sep 24, 2025 11:12 am |
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Hi all,
Probably is a very stupid question, but it was been driving me nuts...
I have a PIC18F26Q10 with UART1 @ 9600 and UART2 @ 19200.
And the UART2 is not working, or in other words is works from only from times to times
the code is:
| Code: | #include <18F26Q10.h>
#device ADC=10
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOEXTOSC //External Oscillator not enabled
#FUSES RSTOSC_HFINTRC_64MHZ //On Power-up clock running from HFINTRC at 64MHz
//#FUSES NOCKS //Clock Switching Enabled
#FUSES NOFCMEN //Fail-safe clock monitor enabled
#FUSES NOMCLR //Master Clear pin enabled
#FUSES PUT //Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV19 //Brownout reset at 1.9V
#FUSES ZCDDIS //Zero-cross detect circuit is disabled at POR
#FUSES NOPPS1WAY //Allows only one reconfiguration of peripheral pins
#FUSES NOSTVREN //Stack full/underflow will cause reset
#FUSES WDTSW //Watch Dog Timer Postscale settable in software
#FUSES WDTWIN_SW //Watchdog Window is settable in software
#FUSES WDTCLK_SW //WDT clock source settable in software
#FUSES NOWRT //Program memory not write protected
#FUSES NOSCANE //Scanner module is available for use
#FUSES NOLVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOEBTR //Memory not protected from table reads
#pin_select U1TX = PIN_C6
#pin_select U1RX = PIN_C7
#use rs232(baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8, stream=PORT1, errors, restart_wdt) // UART1
#pin_select U2TX = PIN_B6
#pin_select U2RX = PIN_B7
#use rs232(baud= 19200, parity=N, xmit = PIN_B6, rcv = PIN_B7, bits=8, stream=portBT, errors, restart_wdt) /*UART2,*/
#use delay(internal=64MHz)//, restart_wdt)
#pin_select CCP1OUT=PIN_C2
#pin_select CCP2OUT=PIN_C1
#use fast_io(A)
#use fast_io(B)
#use fast_io(C)
#use fast_io(E)
#priority INT_RDA2, INT_RDA
void init_micro(void)
{
setup_oscillator(OSC_HFINTRC_64MHZ);
set_tris_a(port_a_dir); // set data I/O directions
port_a_pullups(port_a_pull); // set internal pullups
set_tris_b(port_b_dir); // set data I/O directions
port_b_pullups(port_b_pull); // set internal pullups
set_tris_c(port_c_dir); // set data I/O directions
port_c_pullups(port_c_pull); // set internal pullups
set_tris_e(port_e_dir); // set data I/O directions
port_e_pullups(port_e_pull); // set internal pullups
setup_dac(OFF);
setup_adc_ports(NO_ANALOGS);
setup_spi(SPI_SS_DISABLED);
setup_adc_ports(Ent_ADC_Motor | adc_chanel_Cons_Led, VSS_VDD); // set adc input, voltage reference
setup_adc(ADC_CLOCK_DIV_128);
set_adc_channel(entrada_adc_Mot);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8); //32,7 ms overflow
setup_timer_2(T2_DIV_BY_4 | T2_CLK_INTERNAL,199,1); //50,0 us overflow, 50,0 us interrupt 20Khz
setup_timer_4(T4_DIV_BY_128 | T4_CLK_INTERNAL,255,16); //2,0 ms overflow, 32,7 ms interrupt
setup_timer_6(T6_DIV_BY_16 | T6_CLK_INTERNAL,4,1); //5,0 us overflow, 5,0 us interrupt
setup_ccp1(CCP_PWM);
setup_ccp2(CCP_PWM);
set_pwm1_duty((int16)duty_0);
set_pwm2_duty((int16)duty_0); zero
// enable_interrupts(INT_EXT); // enable interrupts
enable_interrupts(INT_TIMER1); // enable interrupts
enable_interrupts(INT_TIMER4); // enable interrupts
//enable_interrupts(INT_TIMER6); // enable interrupts
enable_interrupts(INT_RDA); // enable interrupts
enable_interrupts(INT_RDA2); // enable interrupts
enable_interrupts(GLOBAL); // enable the interruptss
} |
Any ideas?
Last edited by ralph79 on Thu Sep 25, 2025 1:55 am; edited 1 time in total |
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gaugeguy
Joined: 05 Apr 2011
Posts: 348
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| Posted: Wed Sep 24, 2025 11:42 am |
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| In your #use rs232, use UART1 / UART2 instead of listing the xmit / rcv pins |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19954
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| Posted: Thu Sep 25, 2025 1:10 am |
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And, the pin_select statements should be before your #use RS232 lines. One
pair is, the other isn't. |
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ralph79
Joined: 29 Aug 2007
Posts: 90
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| Posted: Thu Sep 25, 2025 1:56 am |
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| gaugeguy wrote: | | In your #use rs232, use UART1 / UART2 instead of listing the xmit / rcv pins |
I have tested also with UART1 and UART2 even so doesn't work |
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ralph79
Joined: 29 Aug 2007
Posts: 90
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| Posted: Thu Sep 25, 2025 2:12 am |
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| Ttelmah wrote: | And, the pin_select statements should be before your #use RS232 lines. One
pair is, the other isn't. |
it's written like this:
| Code: | #pin_select U1TX = PIN_C6
#pin_select U1RX = PIN_C7
#use rs232(baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8, stream=PORT1, errors, restart_wdt) // UART1
#pin_select U2TX = PIN_B6
#pin_select U2RX = PIN_B7
#use rs232(baud= 19200, parity=N, xmit = PIN_B6, rcv = PIN_B7, bits=8, stream=portBT, errors, restart_wdt) /*UART2,*/ |
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temtronic
Joined: 01 Jul 2010
Posts: 9583
Location: Greensville,Ontario
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| Posted: Thu Sep 25, 2025 5:15 am |
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all the pin_select statements need to be before the #Use rs232...... statements
also, best to NOT have the WDT enabled until AFTER the entire program is 100% working.Then you can decide the proper 'timeout' required for the WDT
and, be sure to have interrupt service routines for all enabled interrupts |
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