converted thefreeman-lin16dac to new API,

but unsure if it works since I it's very uncommon hardware I don't have
(also, there are some obvious things needing fixing, but I'd need hardware
 to calibrate it correctly)

1 files changed, 92 insertions, 0 deletions

diff --git a/hwdef-thefreeman-lin16dac.c b/hwdef-thefreeman-lin16dac.c
new file mode 100644
index 0000000..07c7f9e
--- /dev/null
+++ b/hwdef-thefreeman-lin16dac.c
@@ -0,0 +1,92 @@
+// thefreeman linear t1616 DAC driver helper functions
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+#include "chan-aux.c"
+
+void set_level_zero();
+
+void set_level_main(uint8_t level);
+bool gradual_tick_main(uint8_t gt);
+
+
+Channel channels[] = {
+    { // main LEDs
+        .set_level    = set_level_main,
+        .gradual_tick = gradual_tick_main
+    },
+    AUX_CHANNELS
+};
+
+
+void set_level_zero() {
+    DAC_LVL  = 0;  // DAC off
+    DAC_VREF = V055;  // low Vref
+    HDR_ENABLE_PORT &= ~(1 << HDR_ENABLE_PIN);  // HDR off
+
+    // prevent post-off flash
+    //IN_NFET_ENABLE_PORT |= (1 << IN_NFET_ENABLE_PIN);
+    //delay_4ms(IN_NFET_DELAY_TIME/4);
+    //IN_NFET_ENABLE_PORT &= ~(1 << IN_NFET_ENABLE_PIN);
+
+    // turn off opamp last
+    OPAMP_ENABLE_PORT &= ~(1 << OPAMP_ENABLE_PIN);  // Opamp off
+}
+
+// single set of LEDs with 1 regulated power channel
+// and low/high HDR plus low/high Vref as different "gears"
+void set_level_main(uint8_t level) {
+    #if 0  // unsure if this helps anything
+    uint8_t noflash = 0;
+
+    // when turning on from off, try to prevent a flash
+    if ((! actual_level) && (level < HDR_ENABLE_LEVEL_MIN)) {
+        noflash = 1;
+    }
+    #endif
+
+    // Opamp on first, to give it a few extra microseconds to spin up
+    OPAMP_ENABLE_PORT |= (1 << OPAMP_ENABLE_PIN);
+
+    // pre-load ramp data so it can be assigned faster later
+    PWM_DATATYPE dac_lvl  = PWM_GET(pwm1_levels, level);
+    PWM_DATATYPE dac_vref = PWM_GET(pwm_tops, level);
+
+    // enable HDR on top half of ramp
+    if (level >= (HDR_ENABLE_LEVEL_MIN-1))
+        HDR_ENABLE_PORT |= (1 << HDR_ENABLE_PIN);
+    else
+        HDR_ENABLE_PORT &= ~(1 << HDR_ENABLE_PIN);
+
+    #if 0
+    if (noflash) {
+        // wait for flash prevention to finish
+        delay_4ms(OPAMP_ON_DELAY/4);
+    }
+    #endif
+
+    // set these in successive clock cycles to avoid getting out of sync
+    // (minimizes ramp bumps when changing gears)
+    DAC_LVL  = dac_lvl;
+    DAC_VREF = dac_vref;
+}
+
+bool gradual_tick_main(uint8_t gt) {
+    // if HDR and Vref "engine gear" is the same, do a small adjustment...
+    // otherwise, simply jump to the next ramp level
+    //   and let set_level() handle any gear changes
+
+    PWM_DATATYPE dac_next  = PWM_GET(pwm1_levels, gt);
+    PWM_DATATYPE vref_next = PWM_GET(pwm_tops, gt);
+
+    // different gear = full adjustment
+    if (vref_next != DAC_VREF) return true;  // let parent set_level() for us
+
+    // same gear = small adjustment
+    GRADUAL_ADJUST_SIMPLE(dac_next, DAC_LVL);
+    if (dac_next == DAC_LVL) return true;  // done
+
+    return false;  // not done yet
+}
+