Quick Start Guide for the ACC driver

This is the quick start guide for the SAM3S/4E/4S/V71/V70/S70/E70 Analog Comparator Controller (ACC) Driver, with step-by-step instructions on how to configure and use the driver for a specific use case.

The code examples can be copied into e.g. the main application loop or any other function that will need to control the ACC module.

Use Cases

• ACC Basic Usage

ACC Basic Usage

This use case will demonstrate how to initialize the ACC module in interrupt mode.

Setup Steps

Prerequisites

This module requires the following service:

• System Clock Management (sysclock)

Setup Code

Add this to your main application C-file:

void ACC_Handler(void)
{
} 

Add this to the main loop or a setup function:

    pmc_enable_periph_clk(ID_ACC);

Workflow

1. Initialize the ACC module so that:
   • ADC channel 5 is connected to its positive input
   • DAC channel 0 is connected to its negative input
   • Generate an interrupt on either edge of the output
   • Disable the ACC module output inversion

     
         acc_init(ACC, ACC_MR_SELPLUS_AD5, ACC_MR_SELMINUS_DAC0,
                 ACC_MR_EDGETYP_ANY, ACC_MR_INV_DIS);

2. Enable the ACC module interrupt:

   
       NVIC_EnableIRQ(ACC_IRQn);
   
       acc_enable_interrupt(ACC);

Usage Steps

Usage Code

In the ACC_Handler() function, check if the output result is available by:

if ((ul_status & ACC_ISR_CE) == ACC_ISR_CE) {
} 

In the ACC_Handler() function, check if ADC channel 5 is greater than DAC channel 0 by:

if (acc_get_comparison_result(ACC)) {
    do_something_with_a_greater_result();
} 

In the ACC_Handler() function, check if ADC channel 5 is less than DAC channel 0 by:

if (!acc_get_comparison_result(ACC)) {
    do_something_with_a_lesser_result();
}