Yes i want callibation, but i get errrors that those variables arnt delcleard. Did do declear them somewear?
When i leave them out i dont get the wrigth adc values, with gain of 1 and i use pa02 (ain0) as positive pin and GND and ground as negitive pin, with a 12 bit adc, and INTVCC1 as vref (1.65 volts)
when i put a voltage of 1 volts on the pin it reads 260, i use the seriele terminal to read out the value of the adc
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "samd21.h"
#include "hal_gpio.h"
#include "math.h"
//
// void reverse(char *str, int len);
// void ftoa(float n, char *res, int afterpoint);
// int intToStr(int x, char str[], int d);
//-----------------------------------------------------------------------------
#define PERIOD_FAST 100
#define PERIOD_SLOW 500
HAL_GPIO_PIN(LED, B, 30)
HAL_GPIO_PIN(BUTTON, A, 15)
HAL_GPIO_PIN(UART_TX, A, 22)
HAL_GPIO_PIN(UART_RX, A, 23)
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
static void uart_init(uint32_t baud)
{
uint64_t br = (uint64_t)65536 * (F_CPU - 16 * baud) / F_CPU;
HAL_GPIO_UART_TX_out();
HAL_GPIO_UART_TX_pmuxen(PORT_PMUX_PMUXE_C_Val);
HAL_GPIO_UART_RX_in();
HAL_GPIO_UART_RX_pmuxen(PORT_PMUX_PMUXE_C_Val);
PM->APBCMASK.reg |= PM_APBCMASK_SERCOM3;
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(SERCOM3_GCLK_ID_CORE) |
GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN(0);
SERCOM3->USART.CTRLA.reg =
SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE_USART_INT_CLK |
SERCOM_USART_CTRLA_RXPO(1/*PAD1*/) | SERCOM_USART_CTRLA_TXPO(0/*PAD0*/);
SERCOM3->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
SERCOM_USART_CTRLB_CHSIZE(0/*8 bits*/);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
}
//-----------------------------------------------------------------------------
static void uart_putc(char c)
{
while (!(SERCOM3->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_DRE));
SERCOM3->USART.DATA.reg = c;
}
//-----------------------------------------------------------------------------
static void uart_puts(char *s)
{
while (*s)
uart_putc(*s++);
}
//-----------------------------------------------------------------------------
static void sys_init(void)
{
// Switch to 8MHz clock (disable prescaler)
SYSCTRL->OSC8M.bit.PRESC = 0;
// Enable interrupts
asm volatile ("cpsie i");
}
void adc_init(void);
int adc_read(void);
//-----------------------------------------------------------------------------
int main(void)
{
uint32_t cnt = 0;
bool fast = false;
sys_init();
timer_init();
uart_init(115200);
adc_init();
uint16_t value123 = adc_read();
char str[16];
itoa(value123, str, 10);
uart_puts(str);
while (1)
{
}
return 0;
}
/*- Definitions -------------------------------------------------------------*/
HAL_GPIO_PIN(ADC, A, 2)
/*- Implementations ---------------------------------------------------------*/
//-----------------------------------------------------------------------------
void adc_init(void)
{
HAL_GPIO_ADC_in();
HAL_GPIO_ADC_pmuxen(HAL_GPIO_PMUX_B);
PM->APBCMASK.reg |= PM_APBCMASK_ADC;
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(ADC_GCLK_ID) |
GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN(0);
ADC->CTRLA.reg = ADC_CTRLA_SWRST;
while (ADC->CTRLA.reg & ADC_CTRLA_SWRST);
ADC->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1 | ADC_REFCTRL_REFCOMP;
ADC->CTRLB.reg = ADC_CTRLB_RESSEL_12BIT | ADC_CTRLB_PRESCALER_DIV32;
ADC->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_128;
ADC->INPUTCTRL.reg = ADC_INPUTCTRL_MUXPOS_PIN0 | ADC_INPUTCTRL_MUXNEG_GND |
ADC_INPUTCTRL_GAIN_1X;
ADC->CALIB.reg = ADC_CALIB_BIAS_CAL(NVM_READ_CAL(ADC_BIASCAL)) |
ADC_CALIB_LINEARITY_CAL(NVM_READ_CAL(ADC_LINEARITY));
ADC->CTRLA.reg = ADC_CTRLA_ENABLE;
}
HAL_GPIO_PIN(X, B, 17)
//-----------------------------------------------------------------------------
int adc_read(void)
{
HAL_GPIO_X_out();
HAL_GPIO_X_set();
ADC->SWTRIG.reg = ADC_SWTRIG_START;
while (0 == (ADC->INTFLAG.reg & ADC_INTFLAG_RESRDY));
HAL_GPIO_X_clr();
return ADC->RESULT.reg;
}