int adc_init(adc_t line)
{
uint32_t clk_div = 2;
/* check if the line is valid */
if (line >= ADC_NUMOF) {
return -1;
}
/* lock and power-on the device */
prep(line);
/* configure the pin */
gpio_init_analog(adc_config[line].pin);
/* set sequence length to 1 conversion and enable the ADC device */
dev(line)->SQR1 = 0;
dev(line)->CR2 = ADC_CR2_ADON;
/* set clock prescaler to get the maximal possible ADC clock value */
for (clk_div = 2; clk_div < 8; clk_div += 2) {
if ((CLOCK_CORECLOCK / clk_div) <= MAX_ADC_SPEED) {
break;
}
}
ADC->CCR = ((clk_div / 2) - 1) << 16;
/* free the device again */
done(line);
return 0;
}
int adc_init(adc_t line)
{
uint32_t clk_div = 2;
/* check if the line is valid */
if (line >= ADC_NUMOF) {
return -1;
}
/* lock and power-on the device */
prep(line);
/* configure the pin */
gpio_init_analog(adc_config[line].pin);
/* set clock prescaler to get the maximal possible ADC clock value */
for (clk_div = 2; clk_div < 8; clk_div += 2) {
if ((CLOCK_CORECLOCK / clk_div) <= MAX_ADC_SPEED) {
break;
}
}
RCC->CFGR &= ~(RCC_CFGR_ADCPRE);
RCC->CFGR |= ((clk_div / 2) - 1) << 14;
/* enable the ADC module */
dev(line)->CR2 |= ADC_CR2_ADON;
/* resets the selected ADC calibration registers */
dev(line)->CR2 |= ADC_CR2_RSTCAL;
/* check the status of RSTCAL bit */
while (dev(line)->CR2 & ADC_CR2_RSTCAL) {}
/* enable the selected ADC calibration process */
dev(line)->CR2 |= ADC_CR2_CAL;
/* wait for the calibration to have finished */
while (dev(line)->CR2 & ADC_CR2_CAL) {}
/* set all channels to maximum (239.5) cycles for best accuracy */
dev(line)->SMPR1 |= 0x00ffffff;
dev(line)->SMPR2 |= 0x3fffffff;
/* we want to sample one channel */
dev(line)->SQR1 = ADC_SQR1_L_0;
/* start sampling from software */
dev(line)->CR2 |= ADC_CR2_EXTTRIG | ADC_CR2_EXTSEL;
/* check if this channel is an internal ADC channel, if so
* enable the internal temperature and Vref */
if (adc_config[line].chan == 16 || adc_config[line].chan == 17) {
/* check if the internal channels are configured to use ADC1 */
if (dev(line) != ADC1) {
return -3;
}
dev(line)->CR2 |= ADC_CR2_TSVREFE;
}
/* free the device again */
done(line);
return 0;
}
int adc_init(adc_t line)
{
uint32_t clk_div = 2;
/* check if the line is valid */
if (line >= ADC_NUMOF) {
return -1;
}
/* lock and power-on the device */
prep(line);
/* configure the pin */
gpio_init_analog(adc_config[line].pin);
/* set clock prescaler to get the maximal possible ADC clock value */
for (clk_div = 2; clk_div < 8; clk_div += 2) {
if ((CLOCK_CORECLOCK / clk_div) <= MAX_ADC_SPEED) {
break;
}
}
ADC->CCR = ((clk_div / 2) - 1) << 16;
/* enable the ADC module */
dev(line)->CR2 = ADC_CR2_ADON;
/* check if this channel is an internal ADC channel, if so
* enable the internal temperature and Vref */
if (adc_config[line].chan == 16 || adc_config[line].chan == 17) {
/* check if the internal channels are configured to use ADC1 */
if (dev(line) != ADC1) {
return -3;
}
ADC->CCR |= ADC_CCR_TSVREFE;
}
/* free the device again */
done(line);
return 0;
}
