Messages

1

NXP^TM M522XX, KINETIS and i.MX RT / Re: Setting up ADC

« on: May 13, 2010, 04:01:34 PM »

hi mark,

thank you for your idea of disable the threshold interrupt, it works!!! i can see raw hex values with threshold interrupt disabled. does this mean the threshold interrupt and output of the ADC value can't work together? if i enable the threshold interrupt, it is stuck at the handling function adc_level_change_high and can't see the value.

secondly, if i want to include adc_level_change_high and adc_level_change_low both in fnConfigureADC() can i just add this:

Code: [Select]

       
    adc_setup.int_handler = adc_level_change_high;
    adc_setup.int_handler = adc_level_change_low;                           
    adc_setup.int_adc_int_type = (ADC_HIGH_LIMIT_INT | ADC_LOW_LIMIT_INT);                   
    adc_setup.int_low_level_trigger = (unsigned short)(ADC_VOLT * 1.5);                                     
    adc_setup.int_high_level_trigger = (unsigned short)(ADC_VOLT * 2);

which i can't make it work actually.

2

NXP^TM M522XX, KINETIS and i.MX RT / Re: Setting up ADC

« on: May 02, 2010, 11:38:58 AM »

hi mark,

thanks for your prompt reply. i have tried many times on ADC settings, unfortunately i can't make it work. my objective is very simple, to create 4 channels of ADC to AN0, AN1, AN2, AN3. my reference voltage is 2.5V.

below is all my codes for a single channel, in most simplified form. all these codes are modified based on TEST_ADC in ADC_Timers.h only, without creating any new task, which i think easier to make it work. i followed the instructions given referring to your posts,

in my fnConfigureADC()

Code: [Select]

static void fnConfigureADC(void) //M5223X
{
    ADC_SETUP adc_setup;                                                 // interrupt configuration parameters
    adc_setup.int_type = ADC_INTERRUPT;                                  // identifier when configuring
    adc_setup.int_handler = adc_level_change_high;                       // handling function
    adc_setup.int_priority = ADC_ERR_PRIORITY;                           // ADC interrupt priority
    adc_setup.int_adc_bit = 1;                                           // ADC bit 0
    adc_setup.int_adc_int_type = (ADC_HIGH_LIMIT_INT);                   // interrupt types
    adc_setup.int_adc_offset = 0;                                        // no offset
    adc_setup.int_high_level_trigger = (unsigned short)(ADC_VOLT * 2);
    adc_setup.int_adc_mode = (ADC_CONFIGURE_ADC | ADC_CONFIGURE_CHANNEL | ADC_SEQUENTIAL_MODE | ADC_SINGLE_ENDED | ADC_LOOP_MODE | ADC_START_OPERATION);         // use to test single ended
    adc_setup.int_adc_speed = (unsigned char)(ADC_SAMPLING_SPEED(100000));        // {29} 5MHz sampling (must be between 100kHz and 5MHz)
    adc_setup.int_adc_result = 0;                                        // no result is requested
    fnConfigureInterrupt((void *)&adc_setup);                    // configure test interrupt on high level trigger
    fnResult();                                                              //my result reading function
}

subsequently my fnResult()

Code: [Select]

static void fnResult(void)
{
int iADC_delay = -1;
        CHAR *cBuffer[100];
ADC_SETUP adc_setup;
ADC_RESULTS results;
adc_setup.int_type = ADC_INTERRUPT;
adc_setup.int_adc_bit = 1;
adc_setup.int_adc_result = &results;
adc_setup.int_adc_mode = (ADC_READ_ONLY | ADC_GET_RESULT); //ADC_ALL_RESULTS
do {
fnConfigureInterrupt((void *)&adc_setup);
iADC_delay++;
} while (results.ucADC_status[1] == ADC_RESULT_NOT_READY);
if (results.ucADC_status[1] != ADC_RESULT_NOT_READY) {
fnWrite(SerialPort1, (unsigned char *)"\r\nResult = \r\n", 16); //result ready
fnBufferHex(results.sADC_value[1], (unsigned char)(4 | NO_LEADIN | WITH_TERMINATOR), cBuffer[100]);
fnWrite(SerialPort1, (unsigned char *)cBuffer, 10); //display the value
}
else {
fnWrite(SerialPort1, (unsigned char *)"\r\nResult = NA\r\n", 16);
}
}
my configuration for channel 1 is exactly like above. it's actually free running, and when i inject a low voltage, say 1.5V or 2V, it proceeds to the line fnWrite "Result = ", without showing any value.

after this it will stuck at the handling function adc_level_change_high. by adding a line message fnWrite "lvl high" in adc_level_change_high, what i get in serial output is "Result = ", then "lvl high" and it keeps repeating until i remove the input voltage. i really have no idea which part i make mistake because i follow all the steps, and i presume EVENT 2 has nothing to do with this.

3

NXP^TM M522XX, KINETIS and i.MX RT / Re: Setting up ADC

« on: April 27, 2010, 05:36:06 PM »

hi mark,

thank you for your clarification. i am using fnWrite to output message to my serial for debugging. i modified my ADC in free run mode as mentioned above in ADC_Timers.h, and the code is working except for the part below:

Code: [Select]

#ifdef _ADC_TIMER_INT_EVENTS_2                                           // interrupt range event handling
    fnWrite(SerialPort1, (unsigned char *)"\r\nEVENTS 2\r\n", 13);
    #if defined TEST_ADC                                                 // {17}
fnWrite(SerialPort1, (unsigned char *)"\r\nTEST ADC\r\n", 13);
        #if defined _M5223X                                              // {30}
              if ((ADC_LOW_7 >= ucInputMessage[MSG_INTERRUPT_EVENT]) && (ADC_HIGH_0 <= ucInputMessage[MSG_INTERRUPT_EVENT])) {
                    ADC_SETUP adc_setup;                                 // interrupt configuration parameters
                    ADC_RESULTS results;
                    adc_setup.int_type = ADC_INTERRUPT;                  // identifier
                    adc_setup.int_priority = ADC_ERR_PRIORITY;           // port interrupt priority
                    adc_setup.int_adc_result = &results;
                    if (ucInputMessage[MSG_INTERRUPT_EVENT] < ADC_LOW_0) {
                        adc_setup.int_adc_bit = (ucInputMessage[MSG_INTERRUPT_EVENT] - ADC_HIGH_0);             // ADC bit 0
                        //fnDebugMsg("ADC change high: ");
                        fnWrite(SerialPort1, (unsigned char *)"ADC change high: ", 23);
                        adc_setup.int_handler = adc_level_change_low;
                        adc_setup.int_adc_int_type = (ADC_LOW_LIMIT_INT);// interrupt types
                        adc_setup.int_low_level_trigger = (unsigned short)(ADC_VOLT * 1.5);
                    }
                    else  {
                        adc_setup.int_adc_bit = (ucInputMessage[MSG_INTERRUPT_EVENT] - ADC_LOW_0);
                        //fnDebugMsg("ADC change low: ");
                        fnWrite(SerialPort1, (unsigned char *)"ADC change low: ", 23);
                        adc_setup.int_handler = adc_level_change_high;
                        adc_setup.int_high_level_trigger = (unsigned short)(ADC_VOLT * 2);
                        adc_setup.int_adc_int_type = (ADC_HIGH_LIMIT_INT); // interrupt types
                    }
                    adc_setup.int_adc_mode = (ADC_START_OPERATION | ADC_GET_RESULT);// start operation now and return the present result
                    fnConfigureInterrupt((void *)&adc_setup);            // enter interrupt for low level trigger
                    fnDebugDec(adc_setup.int_adc_bit, 0);                // {44}
                    fnDebugHex(results.sADC_value[adc_setup.int_adc_bit], (WITH_SPACE | WITH_LEADIN | WITH_CR_LF | 2));
                }
                else if ((ADC_ZERO_CROSS_7 >= ucInputMessage[MSG_INTERRUPT_EVENT]) && (ADC_ZERO_CROSS_0 <= ucInputMessage[MSG_INTERRUPT_EVENT])) {
                    //fnDebugMsg("Zero Crossing - channel ");
                    fnWrite(SerialPort1, (unsigned char *)"Zero Crossing - channel ", 23);
                    fnDebugDec((ucInputMessage[MSG_INTERRUPT_EVENT] - ADC_ZERO_CROSS_0), WITH_CR_LF); // {44}
                }
                else if (ADC_TRIGGER == ucInputMessage[MSG_INTERRUPT_EVENT]) {
                    ADC_SETUP adc_setup;                                 // interrupt configuration parameters
                    ADC_RESULTS results;
                    adc_setup.int_type = ADC_INTERRUPT;                  // identifier
                    adc_setup.int_adc_mode = (ADC_READ_ONLY | ADC_GET_RESULT);
                    adc_setup.int_adc_bit = 0;
                    adc_setup.int_adc_result = &results;
                    fnConfigureInterrupt((void *)&adc_setup);
                    //fnDebugMsg("ADC triggered:");
                    fnWrite(SerialPort1, (unsigned char *)"Zero Crossing - channel ", 23);
                    fnDebugHex(results.sADC_value[0], (WITH_SPACE | WITH_LEADIN | WITH_CR_LF | 2));
                }
it seems the program does not enter _ADC_TIMER_INT_EVENTS_2. is this because of free run mode?

i am using fnWrite because somehow fnDebugMsg does not work. therefore i am also having problem for displaying the "results.sADC_value[0]" using fnWrite due to incompatible type. is there other way to display the value from fnBufferHex using fnWrite ??

in free run mode, does it mean adc_level_change_high or adc_level_change_low conditions are not met? because using fnWrite to check line by line message like the quote above, no message is sent to serial.

please advise as i am still a beginner. thanks.

4

NXP^TM M522XX, KINETIS and i.MX RT / Re: Setting up ADC

« on: April 25, 2010, 03:49:12 PM »

hi mark,

i am having problem with my ADC. i configure my ADC and my fnReadRes() in ADC_Timers.h for free run and get result. however i can't get the result display on my serial port.

my configuration is following this post http://www.utasker.com/forum/index.php?topic=280.0 except i am using fnWrite() to display the message on my hyper terminal. i can read any character and message  but i can't get the "results.sADC_value[0]" to display. is there any solution? or is it because of HEX format??

i just want to make free run and read result. the reason i do not use fnDebugMsg() is because it has been disabled for other purpose. my functions are all in the section "#if defined _ADC_TIMER_ROUTINES && defined TEST_ADC".

do "adc_level_change_high" and "adc_level_change_low" involve in free run?? what is the reason of using this: "adc_setup.int_handler = adc_level_change_high;"

one more question, does free run involve _ADC_TIMER_INT_EVENTS_1 and _ADC_TIMER_INT_EVENTS_2 ?? what is the purpose of the events??

hope that you can clarify me as i am a beginner... thanks.