ADC output display problem

Hello Mohammad

Please note that you are writing the raw value and not the ASCII value. So on the Terminal program what you would be seeing is the equivalent ASCII. First check if the UART output on U0TX is the value as being sent by the UARTCharPut.

Also you are taking a 12-bit value and writing it to a 8-bit data register. You would need two writes to send the data.

Hi Amit thanks for your reply

Now I am thinking of using Direct register write to re-program the EVB (for more control ability) I can read the part of ADC and UART in the datasheet to know the names and the map of the registers I need, but my question now is do I access the register on CCS just by it's name e.g.
( UARTDR>> ; ) ??

thanks in advance

I highly recommend you don't do that. Except in very narrow circumstances you do not gain control and you lose a good deal in readability (and write-ability) and debugging.

Robert

Thanks Robert for your reply

I really don't know what is wrong with my code I am freaking out of this problem all I want is to read analog signal and write the result to the UART I am new on Micro-controllers nearly no one in my country dealt with Stellaris lm3s3748 before, I am using it in My Graduation Project , it's the largest portion of the Project to Program the EVB, but I feel that am not close to program it before the deadline, I copied the example [single_ended.c ] and the error {#10010 errors encountered during linking;} appeared. [single_ended.c ] is the most related example I can learn from and I don't know any thing about the error and how we solve this problem and what are the steps needed to program the ADC to UART system.

mohammad sadoun said:

I really don't know what is wrong with my code I am freaking out of this problem all I want is to read analog signal and write the result to the UART I am new on Micro-controllers

That's quite a step up to start.

Slow down and get the UART working first. There are several UART examples in TIVAWare. Once you have that working then you can add in the A/D. Right now you have several items you are trying to get working at once, that makes it hard for you to know where your problem lies.

Robert

Oh, and it well help your helpers if you use the paste code option when providing your source (select use rich formatting and look for the <|> icon).

Robert

Hello Mohammad,

I would rather go for the approach

unsigned char ucLowByte = ADC0Value[0] & 0xFF;
unsigned char ucHighByte = (ADC0Value[0] & 0xFF00) >> 8 ;

UARTCharPut(UART0_BASE, ucLowByte );
UARTCharPut(UART0_BASE, ucHighByte );

thank you Robert for every thing, but what is the TIVAWare? is it helpful given that I am using Stellaris?

Regards

thank you Amit this will help me alot :)
thanks again

Sorry, forgot you were using an obsolete micro. Stellarisware is the older version.

Robert

Hi Robert i wrote a code to configure the UART0 on my Stellaris lm3s3748 but I am getting strange output on the realterm software 

the below is my code and a snapshot of the result, Can you tell me what is the problem in my Code ?

#include "hw_types.h"
#include "hw_memmap.h"
#include "driverlib/adc.h"
#include "inc/lm3s3748.h"
#include <stdio.h>
#include "driverlib/gpio.h"
#include "hw_types.h"
#include "utils/ustdlib.h"
#include "grlib/grlib.h"
#include "driverlib/uart.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/rom.h"
#include "driverlib/debug.h"
#include "inc/hw_ints.h"

int main(void) {

	SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

		SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

		GPIOPinConfigure(GPIO_PA0_U0RX);
			GPIOPinConfigure(GPIO_PA1_U0TX);

			IntMasterEnable();

				GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

				UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 115200,(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |UART_CONFIG_PAR_NONE));

				UARTEnable(UART0_BASE);

					UARTIntEnable(UART0_BASE, UART_INT_TX);

					while(1)
						 {

 unsigned char x= "C";

					    UARTCharPut(UART0_BASE, x);

						}

Result 

Thanks in advance

The problem would be expecting an ASCII result when printing binary.

To compare with the standard C library you are performing an fwrite rather than a fprintf.

Robert

Thanks Robert how can I solve this problem is it in the code or on the setting of the RealTerm software?
thanks in advance