ADC Example

Description

This example demonstrates the usage of the nPZero driver to setup the ADC and there threshould's. Booth ADC's (Internal and External) are set in the example code, the ADC_IN pin for this example is connected to VDD.

Code Example ADC

Code snippet ...

• The example will firstly setup the configuration registers for ADC. This is done in SYSCFG1!!!.
• Set the Over and Under threshold registers in the nPZero by setting ....

   // Set Global Timeout
   static void set_global_timeout(np0_device_s *device)
   {
       // Wake up Host every 5.71 min at 10Hz (343 sec * 10Hz = 0x0D66)
       np0_device_set_wakeup_timeout(device, 0x66, 0x0D);
   }
 
   // Set System Config 1
   static void set_system_config1(np0_device_s *device)
   {
       device->syscfg1.sclk_div_en = 0;
       device->syscfg1.sclk_div_sel = SCLK_DIV_SEL_2;
       device->syscfg1.sclk_sel = 0;
       device->syscfg1.wup1 = 0;
       device->syscfg1.wup2 = 0;
       device->syscfg1.wup3 = 0;
       device->syscfg1.wup4 = 0;
       if (np0_write_SYSCFG1(device->syscfg1) != OK)
       {
           printf("Failed to write SYSCFG1 register\r\n");
       }
   }
 
   // Set System Config 2
   static void set_system_config2(np0_device_s *device, uint8_t adc_ext_on, uint8_t adc_div_en,
                               np0_adc_div_sel_e adc_div_sel, uint8_t WUP_A1, uint8_t WUP_A2, uint8_t wupmod)
   {
       device->syscfg2.adc_ext_on = adc_ext_on;
       device->syscfg2.adc_div_en = adc_div_en;
       device->syscfg2.adc_div_sel = adc_div_sel;
       device->syscfg2.ta1_en = WUP_A1; // Enables the internal ADC channel trigger (VBAT pin) as a wake up source
       device->syscfg2.ta2_en = WUP_A2; // Enables the external ADC channel (ADC_IN pin) as a wake up source
       device->syscfg2.wupmod = wupmod;
       if (np0_write_SYSCFG2(device->syscfg2) != OK)
       {
           printf("Failed to write SYSCFG2 register\n\r\n");
       }
   }
 
   /*****************************************************************************
   * Public Methods
                                                                               */
 
   void example_adc_external(np0_device_s *device)
   {
       printf("Executing external ADC example\r\n");
 
       set_global_timeout(device);
 
       set_system_config1(device);
 
       set_system_config2(device, 1, 1, ADC_DIV_SEL_2, 0, 1, 0);
 
       // Set External ADC (ADC_IN) over threshold Value
       device->throva2.throva = 0x1E; // 1.3 V
       if (np0_write_THROVA2(device->throva2) != OK)
       {
           printf("Failed to write THROVA01 register\r\n");
           return;
       }
 
       // Set External ADC (ADC_IN) under threshold value
       device->thruna2.thruna = 0x0B; // (3.6 V)
       if (np0_write_THRUNA2(device->thruna2) != OK)
       {
           printf("Failed to write THRUNA2 register\r\n");
           return;
       }
 
       // Put the device int to sleep mode
       np0_device_go_sleep(device);
   }
 
   void example_adc_internal(np0_device_s *device)
   {
       printf("Executing internal ADC example\r\n");
 
       set_global_timeout(device);
 
       set_system_config1(device);
 
       set_system_config2(device, 0, 1, ADC_DIV_SEL_2, 1, 0, 0);
 
       // Set Internal ADC over threshold Value
       device->throva1.throva = 0x1E; // 1.3 V
       if (np0_write_THROVA1(device->throva1) != OK)
       {
           printf("Failed to write THROVA01 register\r\n");
           return;
       }
 
       // Set Internal ADC under threshold value
       device->thruna1.thruna = 0x0B; // 3.6 V
       if (np0_write_THRUNA1(device->thruna1) != OK)
       {
           printf("Failed to write THRUNA1 register\r\n");
           return;
       }
 
       // Put the device int to sleep mode
       np0_device_go_sleep(device);
   }
* 

Note

• Adapt the code example to match your MCU throw np0_hal_read and np0_hal_write.
• Consult the nPZero driver function documentation for precise function usage.