ADC Interrupt

Hello Kostakis,

I'm not totally sure, but if you see into the asm fileboot_vectors.syou can see that it exportsEXPORT ADC_Handler [WEAK]

1. You can use this function in your driver(?) file by just implementing it there like this:
   
void ADC_Handler(void) {
uint16_t conversion = GetWord16(GP_ADC_RESULT_REG);
// do required things with the conversion, maybe pass to other function etc...
SetWord16 (GP_ADC_CLEAR_INT_REG 0 x0000);/ /我瘦k interrupt should be cleared
}

2. Enable ADC interrupts:
   
NVIC_SetPriority(ADC_IRQn, 2);
NVIC_EnableIRQ(ADC_IRQn);

3. Initialize ADC (maybe inperiph_setup.c?):
   
adc_init(GP_ADC_SE, 0, GP_ADC_ATTN3X); // For single ended 3x attentuation, for example
SetBits16(GP_ADC_CTRL_REG, GP_ADC_MINT, 1); // Important, or otherwise interrupt will be masked away

4. Then, perform read with ADC:
   
SetBits16(GP_ADC_CTRL_REG, GP_ADC_START, 1);


I'm not totally sure if something is missing/incomplete. Maybe you should disable adc interrupts while you are executing the handler function.

Thanks!

Hi Bharath,

The steps mentioned above are correct, and should trigger an interrupt, make sure that you 've enabled the NVIC for the specified interrupt and also make sure that the interrupts are enabled by the SetBits16(GP_ADC_CTRL_REG, GP_ADC_MINT, 1);, call the enabling of the interrupt just before taking a measurement, this should trigger the interrupt.

Thanks MT_dialog

It only triggered interrupt once. Why it is not repeating?
How to make it repeat at a particular rate?

Thanks
Bharath

Hi Bharath,

You have to explictly start the ADC conversion every time you want to make a measurement, the ADC doesn't free run. If you check the 580 datasheet you will see that the after the conversion is over the GP_ADC_START register flips to 0 and the interrupt bit is set.

Thanks MT_dialog