Merge branch 'trunk' into wurkkos-ts25-boost

* trunk:
  enabled eeprom read/write stabilization by default on recent MCUs, to prevent corrupt data
  thefreeman-avr32dd20-devkit: enable boost bypass at boot, so AA/NiMH can boot
  avr32dd20-devkit: use unimplemented "CH" pin as a boost bypass control
  added "emisar-2ch-fet-joined" build, for D4S w/ lighted switch
  documented FW3X swapped pins better
  documented Wurkkos TS25/TS11/FC13 distinctions
  build.sh: don't require DFPs, newer avr-libc doesn't need them
  use BLIP_LEVEL instead of 0 for "blip"s
  clarified which-hex-file.md a bit; make sure the model number matches
  fw3x: reduced pulsing on low modes

1 files changed, 13 insertions, 0 deletions

diff --git a/hw/thefreeman/avr32dd20-devkit/hwdef.c b/hw/thefreeman/avr32dd20-devkit/hwdef.c
index 3e5dd79..460082f 100644
--- a/hw/thefreeman/avr32dd20-devkit/hwdef.c
+++ b/hw/thefreeman/avr32dd20-devkit/hwdef.c
@@ -30,6 +30,11 @@ void set_level_zero() {
     delay_4ms(IN_NFET_DELAY_TIME/4);
     IN_NFET_ENABLE_PORT &= ~(1 << IN_NFET_ENABLE_PIN);
 
+    #ifdef USE_BST_BYPASS
+    // turn off bypass
+    BST_BYPASS_PORT |= (1 << BST_BYPASS_PIN);
+    #endif
+
     // turn off boost last
     BST_ENABLE_PORT &= ~(1 << BST_ENABLE_PIN);  // BST off
 }
@@ -48,6 +53,14 @@ void set_level_main(uint8_t level) {
     // BST on first, to give it a few extra microseconds to spin up
     BST_ENABLE_PORT |= (1 << BST_ENABLE_PIN);
 
+    #ifdef USE_BST_BYPASS
+    // turn on bypass in li-ion mode
+    if (voltage > DUAL_VOLTAGE_FLOOR)
+        BST_BYPASS_PORT &= ~(1 << BST_BYPASS_PIN);  // low = bypass
+    else  // turn off bypass in AA/NiMH mode
+        BST_BYPASS_PORT |= (1 << BST_BYPASS_PIN);  // high = boost
+    #endif
+
     // pre-load ramp data so it can be assigned faster later
     // DAC level register is left-aligned
     PWM1_DATATYPE dac_lvl  = PWM1_GET(level) << 6;