From 93220f99a52dc93f9a2d5b11074f60156ef70210 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Sat, 13 Jun 2020 18:38:31 +0200
Subject: Get LCD and Si5351 I2C to work

---
 sw/demo1/src/main.rs | 134 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 124 insertions(+), 10 deletions(-)

(limited to 'sw/demo1/src/main.rs')

diff --git a/sw/demo1/src/main.rs b/sw/demo1/src/main.rs
index 80e38b9..4f8ce6e 100644
--- a/sw/demo1/src/main.rs
+++ b/sw/demo1/src/main.rs
@@ -8,13 +8,15 @@ use panic_semihosting as _;
 use stm32f1xx_hal::{
     prelude::*,
     pac,
-    timer::Timer,
+    i2c::{BlockingI2c, Mode},
+    delay::Delay,
 };
 
 use embedded_hal::digital::v2::{OutputPin, ToggleableOutputPin};
+use hd44780_driver::{Cursor, CursorBlink, Display, DisplayMode, HD44780};
+use si5351::{Si5351, Si5351Device};
 
 use core::fmt::Write;
-use nb::block;
 
 fn print(step: usize) -> Result<(), core::fmt::Error> {
     let mut stdout = match hio::hstdout() {
@@ -37,7 +39,9 @@ fn main() -> ! {
 
     let mut flash = dp.FLASH.constrain();
     let mut rcc = dp.RCC.constrain();
+    let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
     let clocks = rcc.cfgr.freeze(&mut flash.acr);
+    let mut delay = Delay::new(cp.SYST, clocks);
 
     let mut gpiob = dp.GPIOB.split(&mut rcc.apb2);
 
@@ -45,28 +49,138 @@ fn main() -> ! {
     let mut led = gpiob.pb14.into_push_pull_output(&mut gpiob.crh);
     led.set_low().unwrap();
 
-    let mut timer = Timer::syst(cp.SYST, &clocks).start_count_down(1.hz());
+    // Configure I2C1 to be used for Si5351 and display
+    let scl = gpiob.pb6.into_alternate_open_drain(&mut gpiob.crl);
+    let sda = gpiob.pb7.into_alternate_open_drain(&mut gpiob.crl);
+
+    let i2c = BlockingI2c::i2c1(
+        dp.I2C1,
+        (scl, sda),
+        &mut afio.mapr,
+        Mode::Standard {
+            frequency: 100_000.hz(),
+        },
+        clocks,
+        &mut rcc.apb1,
+        /* start_timeout_us */ 1000,
+        /* start_retries */ 10,
+        /* addr_timeout_us */ 1000,
+        /* data_timeout_us */ 1000,
+    );
+
+    let i2c_busmanager = shared_bus::CortexMBusManager::new(i2c);
+
+    /*
+    // Configure I2C2
+    let scl2 = gpiob.pb10.into_alternate_open_drain(&mut gpiob.crh);
+    let sda2 = gpiob.pb11.into_alternate_open_drain(&mut gpiob.crh);
+
+    let i2c2 = BlockingI2c::i2c2(
+        dp.I2C2,
+        (scl2, sda2),
+        Mode::Fast {
+            frequency: 400_000.hz(),
+            duty_cycle: DutyCycle::Ratio2to1,
+        },
+        clocks,
+        &mut rcc.apb1,
+        /* start_timeout_us */ 1000,
+        /* start_retries */ 10,
+        /* addr_timeout_us */ 1000,
+        /* data_timeout_us */ 1000,
+    );
+    */
+
+    const I2C_ADDRESS: u8 = 0b010_0000; // MCP23008, depending on solder bridges
+    let mut lcd = match HD44780::new_i2c_mcp23008(i2c_busmanager.acquire(), I2C_ADDRESS, &mut delay) {
+        Ok(lcd) => lcd,
+        Err(_) => panic!("HD44780 init fail"),
+    };
+
+    lcd.reset(&mut delay).unwrap();
+    lcd.clear(&mut delay).unwrap();
+    lcd.set_display_mode(
+        DisplayMode {
+            display: Display::On,
+            cursor_visibility: Cursor::Invisible,
+            cursor_blink: CursorBlink::Off,
+        },
+        &mut delay).unwrap();
+    lcd.set_cursor_pos(0, &mut delay).unwrap();
+    lcd.write_str("Hello, world!", &mut delay).unwrap();
+
+    let ref_clock = 25_000_000;
+    let mut siclock = Si5351Device::new(i2c_busmanager.acquire(), false, ref_clock);
+    siclock.init(si5351::CrystalLoad::_10).unwrap();
+    siclock.set_frequency(si5351::PLL::B, si5351::ClockOutput::Clk0, 28_000_000 + 4_915_200).unwrap();
+    siclock.set_frequency(si5351::PLL::A, si5351::ClockOutput::Clk1, 144_000_000 + 28_000_000).unwrap();
+    siclock.set_frequency(si5351::PLL::A, si5351::ClockOutput::Clk2, 4_915_100).unwrap();
+
+    lcd.set_cursor_pos(0, &mut delay).unwrap();
+    lcd.write_str("Clocks set.     ", &mut delay).unwrap();
 
     let mut step = 0;
     print(step).unwrap();
 
     loop {
-        for _ in 0..5 {
-            led.toggle().unwrap();
-            block!(timer.wait()).ok();
-        }
+        led.toggle().unwrap();
+        delay.delay_ms(600u32);
+
+        lcd.set_cursor_pos(40, &mut delay).unwrap();
+        let mut string = arrayvec::ArrayString::<[_; 16]>::new();
+        write!(string, "Step {}     ", step).unwrap();
+        lcd.write_str(&string, &mut delay).unwrap();
 
-        print(step).unwrap();
         step += 1;
     }
 }
 
 #[cortex_m_rt::exception]
 fn HardFault(ef: &ExceptionFrame) -> ! {
-    panic!("HardFault at {:#?}", ef);
+    let periph = unsafe { cortex_m::Peripherals::steal() };
+    let hfsr = periph.SCB.hfsr.read();
+    let cfsr = periph.SCB.cfsr.read();
+
+    let mut stdout = match hio::hstdout() {
+        Ok(fd) => fd,
+        Err(()) => panic!("no stdout"),
+    };
+
+    let _ = write!(stdout, "Hardfault {:x} {:x} at {:x}\n", hfsr, cfsr, ef.pc);
+    cortex_m::asm::bkpt();
+    loop { }
 }
 
 #[cortex_m_rt::exception]
 fn DefaultHandler(irqn: i16) {
-    panic!("Unhandled exception (IRQn = {})", irqn);
+    let mut stdout = match hio::hstdout() {
+        Ok(fd) => fd,
+        Err(()) => panic!("no stdout"),
+    };
+
+    let _ = write!(stdout, "Unhandled exception (IRQn = {})", irqn);
+    cortex_m::asm::bkpt();
+    loop { }
 }
+
+
+
+    /* code to discover i2c device address
+    let mut stdout = hio::hstdout().unwrap();
+
+    loop {
+        for addr in 0..127usize {
+            let bytes = [0u8; 1];
+            let mut buffer = [0u8; 1];
+            match i2c.write_read(addr as u8, &bytes, &mut buffer) {
+                Ok(()) => {
+                    write!(stdout, "{}: {}\n", addr, buffer[0]).unwrap();
+                },
+                Err(_) => {
+                    write!(stdout, "{}: fail\n", addr).unwrap();
+                },
+            }
+        }
+    }
+    */
+
-- 
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