pru: Move ADC code from gpio.c to new file adc.c

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 0 insertions, 66 deletions

diff --git a/src/pru/gpio.c b/src/pru/gpio.c
index d0d0268b..ba4ba935 100644
--- a/src/pru/gpio.c
+++ b/src/pru/gpio.c
@@ -8,7 +8,6 @@
 #include "command.h" // shutdown
 #include "compiler.h" // ARRAY_SIZE
 #include "gpio.h" // gpio_out_setup
-#include "internal.h" // ADC
 #include "sched.h" // sched_shutdown
 
 
@@ -142,68 +141,3 @@ gpio_in_read(struct gpio_in g)
 {
     return !!(*g.reg & g.bit);
 }
-
-
-/****************************************************************
- * Analog to Digital Converter (ADC) pins
- ****************************************************************/
-
-DECL_CONSTANT(ADC_MAX, 4095);
-
-struct gpio_adc
-gpio_adc_setup(uint8_t pin)
-{
-    uint8_t chan = pin - ARRAY_SIZE(digital_regs) * 32;
-    if (chan >= 8)
-        shutdown("Not an adc channel");
-    if (!readl(&ADC->ctrl))
-        shutdown("ADC module not enabled");
-    return (struct gpio_adc){ .chan = chan };
-}
-
-enum { ADC_DUMMY=0xff };
-static uint8_t last_analog_read = ADC_DUMMY;
-static uint16_t last_analog_sample;
-
-// 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)
-{
-    uint8_t last = last_analog_read;
-    if (last == ADC_DUMMY) {
-        // Start sample
-        last_analog_read = g.chan;
-        writel(&ADC->stepenable, 1 << (g.chan + 1));
-        goto need_delay;
-    }
-    if (last == g.chan) {
-        // Check if sample ready
-        while (readl(&ADC->fifo0count)) {
-            uint32_t sample = readl(&ADC->fifo0data);
-            if (sample >> 16 == g.chan) {
-                last_analog_read = ADC_DUMMY;
-                last_analog_sample = sample;
-                return 0;
-            }
-        }
-    }
-need_delay:
-    return 160;
-}
-
-// Read a value; use only after gpio_adc_sample() returns zero
-uint16_t
-gpio_adc_read(struct gpio_adc g)
-{
-    return last_analog_sample;
-}
-
-// 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)
-        last_analog_read = ADC_DUMMY;
-}