From a00e1e57355f850bce928a770851bc0dc01484c2 Mon Sep 17 00:00:00 2001
From: iabdalkader <i.abdalkader@gmail.com>
Date: Sun, 23 Jan 2022 03:33:43 +0200
Subject: [PATCH] stm32/dac: Deinit all DACs on soft reset.

DAC timed functions continue to run after a soft reset cycle, using
collected memory in the case of write_timed.
---
 ports/stm32/dac.c  | 7 +++++++
 ports/stm32/dac.h  | 2 ++
 ports/stm32/main.c | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/ports/stm32/dac.c b/ports/stm32/dac.c
index fe3aecdde8..d51312aebc 100644
--- a/ports/stm32/dac.c
+++ b/ports/stm32/dac.c
@@ -131,6 +131,13 @@ STATIC void dac_deinit(uint32_t dac_channel) {
     #endif
 }
 
+void dac_deinit_all(void) {
+    dac_deinit(DAC_CHANNEL_1);
+    #if !defined(STM32L452xx)
+    dac_deinit(DAC_CHANNEL_2);
+    #endif
+}
+
 STATIC void dac_config_channel(uint32_t dac_channel, uint32_t trig, uint32_t outbuf) {
     DAC->CR &= ~(DAC_CR_EN1 << dac_channel);
     uint32_t cr_off = DAC_CR_DMAEN1 | DAC_CR_MAMP1 | DAC_CR_WAVE1 | DAC_CR_TSEL1 | DAC_CR_TEN1;
diff --git a/ports/stm32/dac.h b/ports/stm32/dac.h
index fca36e019e..d5686725a4 100644
--- a/ports/stm32/dac.h
+++ b/ports/stm32/dac.h
@@ -28,4 +28,6 @@
 
 extern const mp_obj_type_t pyb_dac_type;
 
+void dac_deinit_all(void);
+
 #endif // MICROPY_INCLUDED_STM32_DAC_H
diff --git a/ports/stm32/main.c b/ports/stm32/main.c
index 431fa20dee..3291a80184 100644
--- a/ports/stm32/main.c
+++ b/ports/stm32/main.c
@@ -654,6 +654,9 @@ soft_reset_exit:
     #if MICROPY_HW_ENABLE_CAN
     can_deinit_all();
     #endif
+    #if MICROPY_HW_ENABLE_DAC
+    dac_deinit_all();
+    #endif
     machine_deinit();
 
     #if MICROPY_PY_THREAD