Part Number: MSP430AFE253
Hello friend:
when I used msp430afe253 to measure current(50hz,sample 120 points),but result is unstable,looks like adc's switch time isn't fast enough?or some suggestion?thx.
system is looks like following:
1)none extended crystal oscillator is used.(so default:dco is 1M,and aclk = vlo = 12k).
2)SD24_init is as following:(SD24OSR_1024 is better,sampling data is more stable.but when we finished a sample cycle(20ms),it looks like more than 300ms,then these sampling data shouldn't be right.)
3)we set TA timer as 50*120 hz.(as following)
4):TA's ISR is STARTING sd24 ADC covert.
5)SD24 ISR is like following:(we just get high 16bit,ignore low 16bit)
so,my question is :
how can i setting/init,then i can sample 120 points in 20ms?(none any extended crystal oscillator).
any errors/understanding is wrong in above code?
