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rfjhh
Joined: 31 Mar 2011
Posts: 51
Location: Mexico
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| USB communication pc pic |
 Posted: Wed May 01, 2019 8:27 pm |
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Hi
I'm trying to connect a PIC18f4550 with a PC. I have several errors but I don't know why.
The code is as follows:
| Code: |
#include<18f4550.h>
#device adc=10; //Conversor A/D de 10 bits
#use delay(clock=20000000) //Frecuencia del cristal oscilador externo
#fuses HSPLL, NOWDT, NOLVP, USBDIV, PLL5, CPUDIV1, VREGEN
#include <usb_cdc.h> // Biblioteca de control USB
#include <usb_desc_cdc.h>
void main()
{
int16 valor_digital; //Valor digital obtenido del conversor A/D
float valor_analogico; //Valor analógico medido en el conversor A/D
char recepcion; //Dato recibido del PC
int1 control; //falso o verdadero para mostrar tensión
setup_adc_ports(AN0); //Definición pin a utilizar como entrada analógica
setup_adc(ADC_CLOCK_INTERNAL);//Definición de la fuente de reloj para el A/D
set_adc_channel(0); //Selección del canal analógico
usb_cdc_init(); //Inicialización del modo CDC
usb_init(); //Inicialización del control del USB
for(;;)
{
usb_task(); //Detección de la conexión de dispositivo USB
//TRUE si dispositivo ha sido enumerado por el PC
if (usb_enumerated())
{
valor_digital=read_adc(); //Lectura del canal analógico
valor_analogico=5.0*valor_digital/1024.0;
if (usb_cdc_kbhit())//Si se ha recibido dato...
{
recepcion=usb_cdc_getc(); //lo lee
//si es caracter vacio(barra espaciadora)enciende o apaga visualización
if (recepcion==' ')
control=control+1; }
//Si control=1 envia a PC valor de tensión leido
if (control==1)
printf(usb_cdc_putc, "\f Voltage = %01.2fV", valor_analogico);
//sino deja de enviarlo y limpia la pantalla del hyperterminal
else
printf(usb_cdc_putc, "\f ");
delay_ms(300);
}
}
}
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The errors are:
| Code: |
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 596(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 598(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 600(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 601(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 603(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 604(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 606(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 607(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 609(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 610(4,26): Undefined identifier usb_ep1_tx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 638(6,39): Undefined identifier usb_ep2_rx_buffer
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 653(21,22): Undefined identifier USBIE
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 653(21,22): Undefined identifier USBIE
*** Error 12 "C:\Program Files (x86)\PICC\devices\usb_cdc.h" Line 668(23,24): Undefined identifier USBIE
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May somebody help me?
Regards |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed May 01, 2019 9:16 pm |
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What's your compiler version ? I don't get those errors with vs. 5.078.
I just get the usual re-entrancy warnings that are normal for the CCS
USB drivers:
| Quote: | >>> Warning 203 "C:\Program Files (x86)\PICC\drivers\pic18_usb.c" Line 727(1,1): Condition always TRUE
>>> Warning 216 "PCH_test.c" Line 43(1,2): Interrupts disabled during call to prevent re-entrancy: (usb_token_reset)
>>> Warning 216 "PCH_test.c" Line 43(1,2): Interrupts disabled during call to prevent re-entrancy: (usb_cdc_get_discard)
>>> Warning 216 "PCH_test.c" Line 43(1,2): Interrupts disabled during call to prevent re-entrancy: (usb_cdc_flush_tx_buffer)
>>> Warning 216 "PCH_test.c" Line 43(1,2): Interrupts disabled during call to prevent re-entrancy: (usb_tbe)
>>> Warning 216 "PCH_test.c" Line 43(1,2): Interrupts disabled during call to prevent re-entrancy: (usb_cdc_init)
Memory usage: ROM=18% RAM=21% - 23%
0 Errors, 6 Warnings.
Build Successful.
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Thu May 02, 2019 1:40 am |
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Some comments inline:
| Code: |
#include<18f4550.h>
#device adc=10; //Conversor A/D de 10 bits
#use delay(clock=20000000) //Frecuencia del cristal oscilador externo
#fuses HSPLL, NOWDT, NOLVP, USBDIV, PLL5, CPUDIV1, VREGEN
//The clock settings here are not possible.
//You are selecting HSPLL, which says that the CPU clock comes from the
//USB PLL. With CPUDIV1, assuming you have a 20MHz crystal (which
//PLL5 implies to feed the USB PLL with 4MHz), your CPU will be running
//at 48MHz.
/* Possible settings
#fuses HS, NOWDT, NOLVP, USBDIV, PLL5, CPUDIV1, VREGEN
#use delay(clock=20000000) //Frecuencia del cristal oscilador externo
//This feeds the CPU off the crystal
#fuses HSPLL, NOWDT, NOLVP, USBDIV, PLL5, CPUDIV1, VREGEN
#use delay(clock=48000000) //Frecuencia del cristal oscilador externo
//This feeds it from the PLL
*/
//Now comment here. Is the chip being powered from the USB?
//If not, USB _requires_ that you implement connection sense.
//Not 'optional', _required_. This needs to be setup before loading
//The USB drivers (#define PIN_USB_SENSE).
//Now your error suggests that the hardware layer (pic18_usb.h)
//is not being loaded. usb_cdc.h should automatically load this.
//Have checked back and even really old (V3) compilers load this
//So means your usb_cdc.h, has probably been modified and this
//is missing. If so, you need:
#include <pic18_usb.h>
#include <usb_cdc.h> // Biblioteca de control USB
#include <usb_desc_cdc.h>
void main()
{
int16 valor_digital; //Valor digital obtenido del conversor A/D
float valor_analogico; //Valor analógico medido en el conversor A/D
char recepcion; //Dato recibido del PC
int1 control; //falso o verdadero para mostrar tensión
setup_adc_ports(AN0); //Definición pin a utilizar como entrada analógica
//This is not a legal clock for the ADC at this frequency. It'll work
//but give poor results. This is a mistake that CCS also make in their
//examples....
setup_adc(ADC_CLOCK_INTERNAL);//Definición de la fuente de reloj para el A/D
set_adc_channel(0); //Selección del canal analógico
//usb_init, should be called before cdc_init.
usb_cdc_init(); //Inicialización del modo CDC
usb_init(); //Inicialización del control del USB
for(;;)
{
usb_task(); //Detección de la conexión de dispositivo USB
//TRUE si dispositivo ha sido enumerado por el PC
if (usb_enumerated())
{
valor_digital=read_adc(); //Lectura del canal analógico
valor_analogico=5.0*valor_digital/1024.0;
if (usb_cdc_kbhit())//Si se ha recibido dato...
{
recepcion=usb_cdc_getc(); //lo lee
//si es caracter vacio(barra espaciadora)enciende o apaga visualización
if (recepcion==' ')
control=control+1; }
//Si control=1 envia a PC valor de tensión leido
if (control==1)
printf(usb_cdc_putc, "\f Voltage = %01.2fV", valor_analogico);
//sino deja de enviarlo y limpia la pantalla del hyperterminal
else
printf(usb_cdc_putc, "\f ");
delay_ms(300);
}
}
}
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There is also an issue that there is no delay in the loop, if there is not
a character received on the USB. The adc requires time to reacquire.
However the time involved in the maths done to convert the ADC reading
to a numeric value will probably be enough. |
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rfjhh
Joined: 31 Mar 2011
Posts: 51
Location: Mexico
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| Compiler version |
| Posted: Thu May 02, 2019 8:37 am |
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| I'm using version 5.015 |
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rfjhh
Joined: 31 Mar 2011
Posts: 51
Location: Mexico
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| Posted: Thu May 02, 2019 9:09 am |
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Yes, the crystal is 20MHz divided by 5 is 4MHz clock needed for 96 MHz PLL.
The chip is not powered from the USB. The power is supplied by VDD.
The pic18_usb.h file I think is included:
#if __USB_PIC_PERIF__
#if defined(__PCM__)
#include <pic16f_usb.h> //Microchip PIC16Fxxxx hardware layer for usb.c
#elif defined(__PCH__)
#include <pic18_usb.h> //Microchip 18Fxx5x hardware layer for usb.c
#else |
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