1 files changed, 0 insertions, 121 deletions
diff --git a/src/samd21/adc.c b/src/samd21/adc.c
deleted file mode 100644
index 38836592..00000000
--- a/src/samd21/adc.c
+++ /dev/null
@@ -1,121 +0,0 @@
-// Analog to Digital Converter support
-//
-// Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "command.h" // shutdown
-#include "gpio.h" // gpio_adc_read
-#include "internal.h" // GPIO
-#include "samd21.h" // ADC
-#include "sched.h" // sched_shutdown
-
-static const uint8_t adc_pins[] = {
-    GPIO('A', 2), GPIO('A', 3), GPIO('B', 8), GPIO('B', 9), GPIO('A', 4),
-    GPIO('A', 5), GPIO('A', 6), GPIO('A', 7), GPIO('B', 0), GPIO('B', 1),
-    GPIO('B', 2), GPIO('B', 3), GPIO('B', 4), GPIO('B', 5), GPIO('B', 6),
-    GPIO('B', 7), GPIO('A', 8), GPIO('A', 9), GPIO('A', 10), GPIO('A', 11)
-};
-
-DECL_CONSTANT(ADC_MAX, 4095);
-
-static void
-adc_init(void)
-{
-    static uint8_t have_run_init;
-    if (have_run_init)
-        return;
-    have_run_init = 1;
-
-    // Enable adc clock
-    enable_pclock(ADC_GCLK_ID, PM_APBCMASK_ADC);
-
-    // Load calibraiton info
-    uint32_t v = *((uint32_t*)ADC_FUSES_BIASCAL_ADDR);
-    uint32_t bias = (v & ADC_FUSES_BIASCAL_Msk) >> ADC_FUSES_BIASCAL_Pos;
-    v = *((uint32_t*)ADC_FUSES_LINEARITY_0_ADDR);
-    uint32_t li0 = (v & ADC_FUSES_LINEARITY_0_Msk) >> ADC_FUSES_LINEARITY_0_Pos;
-    v = *((uint32_t*)ADC_FUSES_LINEARITY_1_ADDR);
-    uint32_t li5 = (v & ADC_FUSES_LINEARITY_1_Msk) >> ADC_FUSES_LINEARITY_1_Pos;
-    uint32_t lin = li0 | (li5 << 5);
-    ADC->CALIB.reg = ADC_CALIB_BIAS_CAL(bias) | ADC_CALIB_LINEARITY_CAL(lin);
-
-    // Setup and enable adc
-    ADC->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1;
-    ADC->CTRLB.reg = ADC_CTRLB_PRESCALER_DIV128;
-    ADC->SAMPCTRL.reg = 63;
-    ADC->CTRLA.reg = ADC_CTRLA_ENABLE;
-}
-
-struct gpio_adc
-gpio_adc_setup(uint8_t pin)
-{
-    // Find pin in adc_pins table
-    uint8_t chan;
-    for (chan=0; ; chan++) {
-        if (chan >= ARRAY_SIZE(adc_pins))
-            shutdown("Not a valid ADC pin");
-        if (adc_pins[chan] == pin)
-            break;
-    }
-
-    // Enable ADC
-    adc_init();
-
-    // Set pin in ADC mode
-    gpio_peripheral(pin, 'B', 0);
-
-    return (struct gpio_adc){ chan };
-}
-
-enum { ADC_DUMMY=0xff };
-static uint8_t last_analog_read = ADC_DUMMY;
-
-// Try to sample a value. Returns zero if sample ready, otherwise
-// returns the number of clock ticks the caller should wait before
-// retrying this function.
-uint32_t
-gpio_adc_sample(struct gpio_adc g)
-{
-    if (last_analog_read == g.chan) {
-        if (ADC->INTFLAG.reg & ADC_INTFLAG_RESRDY)
-            // Sample now ready
-            return 0;
-        // ADC is still busy
-        goto need_delay;
-    }
-    if (last_analog_read != ADC_DUMMY)
-        // Sample on another channel in progress
-        goto need_delay;
-    last_analog_read = g.chan;
-
-    // Set the channel to sample
-    ADC->INPUTCTRL.reg = (ADC_INPUTCTRL_MUXPOS(g.chan)
-                          | ADC_INPUTCTRL_MUXNEG_GND | ADC_INPUTCTRL_GAIN_DIV2);
-
-    // Start the sample
-    ADC->SWTRIG.reg = ADC_SWTRIG_START;
-
-    // Schedule next attempt after sample is likely to be complete
-need_delay:
-    return 42 * 128 + 200; // 42 == 1 + (63+1)/2 + 1 + 12/2 + 1.5
-}
-
-// Read a value; use only after gpio_adc_sample() returns zero
-uint16_t
-gpio_adc_read(struct gpio_adc g)
-{
-    last_analog_read = ADC_DUMMY;
-    return ADC->RESULT.reg;
-}
-
-// Cancel a sample that may have been started with gpio_adc_sample()
-void
-gpio_adc_cancel_sample(struct gpio_adc g)
-{
-    if (last_analog_read == g.chan) {
-        ADC->SWTRIG.reg = ADC_SWTRIG_FLUSH;
-        ADC->INTFLAG.reg = ADC_INTFLAG_RESRDY;
-        last_analog_read = ADC_DUMMY;
-    }
-}