lora-car/libopencm3/lib/sam/4l/adcife.c

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/** @addtogroup scif
*
* @brief <b>Access functions for the SAM4 Analog to Digital Converter Interface (ADCIFE)</b>
* @ingroup SAM4
* LGPL License Terms @ref lgpl_license
* @author @htmlonly &copy; @endhtmlonly 2016
* Maxim Sloyko <maxims@google.com>
*
*/
#include <libopencm3/sam/adcife.h>
/** @brief Enable ADC interface. Must be done before any other configuration.
*
* This function does it synchronously and returns only when the interface is
* actually enabled.
*/
void adcife_enable_sync(void)
{
ADCIFE_CR = ADCIFE_CR_EN;
while (!(ADCIFE_SR & ADCIFE_SR_EN));
}
void adcife_configure(
enum adcife_refsel ref,
enum adcife_speed speed,
enum adcife_clk clk,
enum adcife_prescal prescal)
{
ADCIFE_CFG = ADCIFE_CFG_REFSEL_MASKED(ref)
| ADCIFE_CFG_SPEED_MASKED(speed)
| ADCIFE_CFG_PRESCAL_MASKED(prescal)
| clk;
}
void adcife_select_channel(enum adcife_channel ad)
{
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_MUXPOS_MASKED(ad);
}
void adcife_set_resolution(enum adcife_resolution res)
{
if (ADCIFE_RESOLUTION_12BITS == res) {
ADCIFE_SEQCFG &= ~ADCIFE_SEQCFG_RES;
} else {
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_RES;
}
}
void adcife_select_trigger(enum adcife_trigger trig)
{
ADCIFE_SEQCFG &= ~ADCIFE_SEQCFG_TRGSEL_MASK;
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_TRGSEL_MASKED(trig);
}
void adcife_set_gain(enum adcife_gain gain)
{
ADCIFE_SEQCFG &= ~ADCIFE_SEQCFG_GAIN_MASK;
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_GAIN_MASKED(gain);
}
void adcife_set_bipolar(bool enable)
{
if (enable) {
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_BIPOLAR;
} else {
ADCIFE_SEQCFG &= ~ADCIFE_SEQCFG_BIPOLAR;
}
}
void adcife_set_left_adjust(bool enable)
{
if (enable) {
ADCIFE_SEQCFG |= ADCIFE_SEQCFG_HWLA;
} else {
ADCIFE_SEQCFG &= ~ADCIFE_SEQCFG_HWLA;
}
}
void adcife_start_conversion(void)
{
ADCIFE_CR = ADCIFE_CR_STRIG;
}
void adcife_wait_conversion(void)
{
while (!(ADCIFE_SR & ADCIFE_SR_SEOC));
ADCIFE_SCR = ADCIFE_SR_SEOC;
}
struct adcife_lcv adcife_get_lcv(void)
{
struct adcife_lcv res;
res._lc_u.lcv = ADCIFE_LCV;
return res;
}
void adcife_enable_interrupts(uint32_t imask)
{
ADCIFE_IER = imask;
}
void adcife_disable_interrupts(uint32_t imask)
{
ADCIFE_IDR = imask;
}
void adcife_timer_start(void)
{
ADCIFE_CR = ADCIFE_CR_TSTART;
}
void adcife_timer_stop(void)
{
ADCIFE_CR = ADCIFE_CR_TSTOP;
}
void adcife_timer_set_timeout(uint16_t timeout)
{
ADCIFE_TIM = timeout;
}