From 62955894673b17aad1edba6e34855d5f3a5e8438 Mon Sep 17 00:00:00 2001
From: Bob McWhirter <bmcwhirt@redhat.com>
Date: Tue, 8 Jun 2021 15:09:17 -0400
Subject: [PATCH] Bring over DAC example (relies upon stm32-data update)

---
 examples/stm32h7/Cargo.toml     |  6 +--
 examples/stm32h7/src/bin/dac.rs | 92 +++++++++++++++++++++++++++++++++
 stm32-data                      |  2 +-
 3 files changed, 95 insertions(+), 5 deletions(-)
 create mode 100644 examples/stm32h7/src/bin/dac.rs

diff --git a/examples/stm32h7/Cargo.toml b/examples/stm32h7/Cargo.toml
index 23874a56..d7288e4c 100644
--- a/examples/stm32h7/Cargo.toml
+++ b/examples/stm32h7/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
 edition = "2018"
-name = "embassy-stm32h4-examples"
+name = "embassy-stm32h7-examples"
 version = "0.1.0"
 resolver = "2"
 
@@ -23,8 +23,6 @@ embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["
 embassy-extras = {version = "0.1.0", path = "../../embassy-extras" }
 stm32h7 = { version = "0.13", features = ["stm32h743"]}
 stm32h7xx-hal = { version = "0.9.0", features = ["stm32h743"] }
-#stm32l4 = { version = "0.13", features = ["stm32l4x5" ] }
-#stm32l4xx-hal = { version = "0.6.0", features = ["stm32l4x5"] }
 
 defmt = "0.2.0"
 defmt-rtt = "0.2.0"
@@ -37,5 +35,5 @@ futures = { version = "0.3.8", default-features = false, features = ["async-awai
 rtt-target = { version = "0.3", features = ["cortex-m"] }
 heapless = { version = "0.7.1", default-features = false }
 
-#micromath = "2.0.0"
+micromath = "2.0.0"
 
diff --git a/examples/stm32h7/src/bin/dac.rs b/examples/stm32h7/src/bin/dac.rs
new file mode 100644
index 00000000..c6f3de7b
--- /dev/null
+++ b/examples/stm32h7/src/bin/dac.rs
@@ -0,0 +1,92 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use embassy_stm32::gpio::{Level, Output, Input, Pull, NoPin};
+use embedded_hal::digital::v2::{OutputPin, InputPin};
+use example_common::*;
+
+use cortex_m_rt::entry;
+use stm32h7::stm32h743 as pac;
+use embassy_stm32::spi::{Spi, MODE_0, ByteOrder, Config};
+use embassy_stm32::time::Hertz;
+use embedded_hal::blocking::spi::Transfer;
+use stm32h7xx_hal::{rcc, prelude::*};
+use embassy_stm32::dac::{Dac, Value, Channel};
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World, dude!");
+
+    let pp = pac::Peripherals::take().unwrap();
+
+    let pwrcfg = pp.PWR.constrain()
+        .freeze();
+
+    let rcc = pp.RCC.constrain();
+
+    let ccdr = rcc
+        .sys_ck(96.mhz())
+        .pclk1(48.mhz())
+        .pclk2(48.mhz())
+        .pclk3(48.mhz())
+        .pclk4(48.mhz())
+        .pll1_q_ck(48.mhz())
+        .freeze(pwrcfg, &pp.SYSCFG);
+
+    let pp = unsafe { pac::Peripherals::steal() };
+
+    pp.DBGMCU.cr.modify(|_, w| {
+        w.dbgsleep_d1().set_bit();
+        w.dbgstby_d1().set_bit();
+        w.dbgstop_d1().set_bit();
+        w.d1dbgcken().set_bit();
+        w
+    });
+
+    pp.RCC.apb1lenr.modify(|_, w|{
+        w.dac12en().set_bit();
+        w
+    });
+
+    pp.RCC.ahb4enr.modify(|_, w| {
+        w.gpioaen().set_bit();
+        w.gpioben().set_bit();
+        w.gpiocen().set_bit();
+        w.gpioden().set_bit();
+        w.gpioeen().set_bit();
+        w.gpiofen().set_bit();
+        w
+    });
+
+    let p = embassy_stm32::init(Default::default());
+
+    let mut dac = Dac::new(p.DAC1, p.PA4, NoPin);
+
+    loop {
+        for v in 0..=255 {
+            dac.set(Channel::Ch1, Value::Bit8(to_sine_wave(v)));
+            dac.trigger( Channel::Ch1 );
+        }
+    }
+}
+
+use micromath::F32Ext;
+
+fn to_sine_wave(v: u8) -> u8 {
+    if v >= 128 {
+        // top half
+        let r = 3.14 * ( (v-128) as f32/ 128.0) ;
+        (r.sin() * 128.0 + 127.0) as u8
+    } else {
+        // bottom half
+        let r = 3.14 + 3.14 * (v as f32/ 128.0);
+        (r.sin() * 128.0 + 127.0) as u8
+    }
+}
diff --git a/stm32-data b/stm32-data
index 4bb1b178..f07c793b 160000
--- a/stm32-data
+++ b/stm32-data
@@ -1 +1 @@
-Subproject commit 4bb1b178cd1c555cfedaea31ad0be3c6a7b99563
+Subproject commit f07c793bbe81b01b2f3668177648f024ec1c8fb1