topic Re: ADC with MPC5748G in MPC5xxx

ADC with MPC5748G

Elsa_24 — Mon, 22 Mar 2021 08:27:04 GMT

Hi, I would like to know how to read for example the voltage across a pin using the ADC. I have already activated the PI[11] pin corresponding to Standard Channel 19 of the ADC0 and I would like to read the voltage across this pin. And the ADC component has already been added to the project Thanks

Re: ADC with MPC5748G

PetrS — Mon, 22 Mar 2021 09:24:59 GMT

Hi,

if using the SDK you can refer to e.g. "adc_swtrigger_mpc5748g" demo example to know how ADC driver can be used.

BR, Petr

Re: ADC with MPC5748G

Elsa_24 — Mon, 22 Mar 2021 13:49:04 GMT

Hi PetrS,

Thanks for your Answer.

As you advised, I tried to understand the example "adc_swtrigger_mpc5748g"

As a small modification, I tried to display with the UART the value of the result on the Terminal. but I can't do it. I've been trying to figure out how to do this.

Here is the part of the code that I modified:
I just added the "LINFLEXD_UART_DRV_SendData" But it doesn't show me anything on the Terminal

if (result > ADC_THRESHOLD)
{

PINS_DRV_ClearPins(LED_PORT, (1 << LED));

LINFLEXD_UART_DRV_SendData(INST_LINFLEXD_UART1, result, 1u);

}
else
{

PINS_DRV_SetPins(LED_PORT, (1 << LED));

LINFLEXD_UART_DRV_SendData(INST_LINFLEXD_UART1, result, 1u);
}

Thanks

Re: ADC with MPC5748G

PetrS — Tue, 23 Mar 2021 09:22:34 GMT

Hi,

the "result" is integer variable and LINFLEXD_UART_DRV_SendData expect char/string to send it through LINFlexD. You need to convert "result" to string.

BR, Petr

Re: ADC with MPC5748G

Elsa_24 — Wed, 24 Mar 2021 08:50:25 GMT

Hi PerS,

Another Question Please

Why, in the example, is number 9 assigned as the ADC_Channel_Number when PB[4] corresponds to precision channel 0 in the ADC1?

#define ADC_CHAN_NUM (9u) /* ADC1_P[0] corresponding to PB[4] */

Thanks

Re: ADC with MPC5748G

PetrS — Thu, 25 Mar 2021 08:30:08 GMT

Hi,

see Table 32-4. ADC channel mapping of the RM.

ADC1_P[0] is mapped to the channel 9 of the ADC1

BR, Petr

Re: ADC with MPC5748G

SAchary11 — Wed, 10 Aug 2022 12:29:15 GMT

Hello Elsa,

I am also trying to measure the supply voltage or battery voltage in MPC5748G using ADC,

Can you please help me out how did you configure the ADC and also the propcedure you followed?