nRF51822 ADC without UART

RE: nRF51822 ADC without UART

jing — Thu, 10 Mar 2016 08:21:44 GMT

I think the appropriate fix is to wait for the END event before reading the RESULT.

while (NRF_ADC->EVENTS_END == 0)
{
}

RE: nRF51822 ADC without UART

Bombo — Thu, 12 Feb 2015 14:32:38 GMT

I think I found it. There needs to be a small delay between the start task and the check for busy.

uint16_t ADC_Read(void)
{
NRF_ADC->TASKS_START = 1;
__NOP(); // Delay to get the adc started
while(NRF_ADC->BUSY == 1)
{
}
NRF_ADC->TASKS_STOP = 1;
return NRF_ADC->RESULT;
}

The UART did somehow delay the CPU.

RE: nRF51822 ADC without UART

Bombo — Thu, 12 Feb 2015 13:30:35 GMT

I don't send data over the UART, only over the air. If I enable the UART it will be the first function in the main function.

RE: nRF51822 ADC without UART

Alex — Thu, 12 Feb 2015 11:00:45 GMT

Must be one of the simple coding mistakes such as:

Variable sent over the air modified in one of the UART functions.
ADC restarted in UART function.