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