flash: fix flash read

src/flash.rs

@@ -1,91 +1,64 @@
-use embedded_hal::{
+use heapless::{String, consts::*};
-    digital::v2::{OutputPin, InputPin},
+use smoltcp as net;
-    blocking::spi::Transfer,
+use embedded_nal as nal;
-    blocking::delay::DelayUs,
+use core::str::FromStr;
-};
 
-#[derive(Debug)]
+unsafe fn read_record_length(addr: u32) -> u32 {
-pub enum FPGAFlashError {
+    core::ptr::read(addr as *const u32)
-    SPICommunicationError,
-    NegotiationError,
-    ResetStatusError,
 }
 
-const DATA: &'static [u8] = include_bytes!("../build/top.bin");
+unsafe fn read_byte(addr: u32) -> u8 {
+    core::ptr::read(addr as *const u8)
+}
 
-// A public method to flash iCE40 FPGA on Humpback
+fn read_flash_str(addr: &mut u32) -> (String<U32>, String<U64>) {
-pub fn flash_ice40_fpga<SPI: Transfer<u8>,
+    let mut key: String<U32> = String::new();
-                        SS: OutputPin,
+    let mut string: String<U64> = String::new();
-                        RST: OutputPin,
-                        DELAY: DelayUs<u32>,
-                        DONE: InputPin>
-    (mut spi: SPI, mut ss: SS, mut creset: RST, cdone: DONE, mut delay: DELAY) -> Result<(), FPGAFlashError>
-{
-    // Data buffer setup
-    let mut dummy_byte :[u8; 1] = [0x00];
-    let mut dummy_13_bytes :[u8; 13] = [0x00; 13];
     
-    // Drive CRESET_B low
+    let record_length = unsafe {
-    creset.set_low()
+        read_record_length(*addr)
-            .map_err(|_| FPGAFlashError::NegotiationError)?;
-
-    // Drive SPI_SS_B low
-    ss.set_low()
-        .map_err(|_| FPGAFlashError::NegotiationError)?;
-
-    // Wait at least 200ns
-    delay.delay_us(1_u32);
-
-    // Drive CRESET_B high
-    creset.set_high()
-            .map_err(|_| FPGAFlashError::NegotiationError)?;
-
-    // Wait at least another 1200us to clear internal config memory
-    delay.delay_us(1200_u32);
-
-    // Before data transmission starts, check if C_DONE is truly low
-    // If C_DONE is high, the FPGA reset procedure is unsuccessful
-    match cdone.is_low() {
-        Ok(true) => {},
-        _ => return Err(FPGAFlashError::ResetStatusError),
     };
-
+    if record_length == 0xFFFFFFFF {
-    // Set SPI_SS_B high
+        return (key, string);
-    ss.set_high()
-        .map_err(|_| FPGAFlashError::NegotiationError)?;
-
-    // Send 8 dummy clock, effectively 1 byte of 0x00
-    spi.transfer(&mut dummy_byte)
-        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
-
-    // Drive SPI_SS_B low
-    ss.set_low()
-        .map_err(|_| FPGAFlashError::NegotiationError)?;
-
-    // Send the whole image without interruption
-    for byte in DATA.into_iter() {
-        let mut single_byte_slice = [*byte];
-        spi.transfer(&mut single_byte_slice)
-            .map_err(|_| FPGAFlashError::SPICommunicationError)?;
     }
 
-    // Drive SPI_SS_B high
+    let mut key_string_div = false;
-    ss.set_high()
+    for f_addr in (*addr)+4..((*addr)+record_length) {
-        .map_err(|_| FPGAFlashError::NegotiationError)?;
+        if key_string_div {
-
+            string.push(unsafe {read_byte(f_addr)} as char).unwrap();
-    // Send at another 100 dummy clocks (choosing 13 bytes)
+        } else {
-    spi.transfer(&mut dummy_13_bytes)
+            let c = unsafe {read_byte(f_addr)};
-        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+            if c == 0 {
-
+                key_string_div = true;
-    // Check the CDONE output from FPGA
+            } else {
-    // CDONE needs to be high
+                key.push(c as char).unwrap();
-    match cdone.is_high() {
+            }
-        Ok(true) => {},
+        }
-        _ => return Err(FPGAFlashError::ResetStatusError),
+    }
-    };
+    *addr += record_length;
-
+    (key, string)
-    // Send at least another 49 clock cycles to activate IO pins (choosing same 13 bytes)
+}
-    spi.transfer(&mut dummy_13_bytes).map_err(|_| FPGAFlashError::SPICommunicationError)?;
+
-    Ok(())
+pub fn read_flash(addr: &mut u32)
-
+    -> (net::wire::IpCidr, net::wire::EthernetAddress, nal::Ipv4Addr, String<U64>)
+{
+    let mut cidr = net::wire::IpCidr::Ipv6(
+        net::wire::Ipv6Cidr::SOLICITED_NODE_PREFIX,
+    );
+    let mut eth = net::wire::EthernetAddress::BROADCAST;
+    let mut ip = nal::Ipv4Addr::unspecified();
+    let mut name = String::new();
+    loop {
+        let (key, string) = read_flash_str(addr);
+        if key.len() == 0 {
+            return (cidr, eth, ip, name);
+        }
+        match key.as_str() {
+            "CIDR" => cidr = net::wire::IpCidr::from_str(&string).unwrap(),
+            "MAC" => eth = net::wire::EthernetAddress::from_str(&string).unwrap(),
+            "BrokerIP" => ip = nal::Ipv4Addr::from_str(&string).unwrap(),
+            "Name" => name = string,
+            _ => {},
+        }
+    }
 }

src/fpga.rs

@@ -0,0 +1,91 @@
+use embedded_hal::{
+    digital::v2::{OutputPin, InputPin},
+    blocking::spi::Transfer,
+    blocking::delay::DelayUs,
+};
+
+#[derive(Debug)]
+pub enum FPGAFlashError {
+    SPICommunicationError,
+    NegotiationError,
+    ResetStatusError,
+}
+
+const DATA: &'static [u8] = include_bytes!("../build/top.bin");
+
+// A public method to flash iCE40 FPGA on Humpback
+pub fn flash_ice40_fpga<SPI: Transfer<u8>,
+                        SS: OutputPin,
+                        RST: OutputPin,
+                        DELAY: DelayUs<u32>,
+                        DONE: InputPin>
+    (mut spi: SPI, mut ss: SS, mut creset: RST, cdone: DONE, mut delay: DELAY) -> Result<(), FPGAFlashError>
+{
+    // Data buffer setup
+    let mut dummy_byte :[u8; 1] = [0x00];
+    let mut dummy_13_bytes :[u8; 13] = [0x00; 13];
+
+    // Drive CRESET_B low
+    creset.set_low()
+            .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Drive SPI_SS_B low
+    ss.set_low()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Wait at least 200ns
+    delay.delay_us(1_u32);
+
+    // Drive CRESET_B high
+    creset.set_high()
+            .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Wait at least another 1200us to clear internal config memory
+    delay.delay_us(1200_u32);
+
+    // Before data transmission starts, check if C_DONE is truly low
+    // If C_DONE is high, the FPGA reset procedure is unsuccessful
+    match cdone.is_low() {
+        Ok(true) => {},
+        _ => return Err(FPGAFlashError::ResetStatusError),
+    };
+
+    // Set SPI_SS_B high
+    ss.set_high()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send 8 dummy clock, effectively 1 byte of 0x00
+    spi.transfer(&mut dummy_byte)
+        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+
+    // Drive SPI_SS_B low
+    ss.set_low()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send the whole image without interruption
+    for byte in DATA.into_iter() {
+        let mut single_byte_slice = [*byte];
+        spi.transfer(&mut single_byte_slice)
+            .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+    }
+
+    // Drive SPI_SS_B high
+    ss.set_high()
+        .map_err(|_| FPGAFlashError::NegotiationError)?;
+
+    // Send at another 100 dummy clocks (choosing 13 bytes)
+    spi.transfer(&mut dummy_13_bytes)
+        .map_err(|_| FPGAFlashError::SPICommunicationError)?;
+
+    // Check the CDONE output from FPGA
+    // CDONE needs to be high
+    match cdone.is_high() {
+        Ok(true) => {},
+        _ => return Err(FPGAFlashError::ResetStatusError),
+    };
+
+    // Send at least another 49 clock cycles to activate IO pins (choosing same 13 bytes)
+    spi.transfer(&mut dummy_13_bytes).map_err(|_| FPGAFlashError::SPICommunicationError)?;
+    Ok(())
+
+}

src/main.rs

@@ -10,7 +10,7 @@ use stm32h7xx_hal::ethernet;
 
 use smoltcp as net;
 use minimq::{
-    embedded_nal::{ IpAddr, Ipv4Addr },
+    embedded_nal::IpAddr,
     MqttClient, QoS
 };
 
@@ -20,8 +20,6 @@ use rtic::cyccnt::{Instant, U32Ext};
 
 use heapless::{ String, consts, consts::* };
 
-use core::convert::TryInto;
-
 #[macro_use]
 pub mod bitmask_macro;
 pub mod spi_slave;
@@ -32,12 +30,14 @@ pub mod attenuator;
 pub mod dds;
 pub mod nal_tcp_client;
 use crate::nal_tcp_client::{ NetStorage, NetworkStack };
-pub mod flash;
+pub mod fpga;
-use crate::flash::flash_ice40_fpga;
+use crate::fpga::flash_ice40_fpga;
 pub mod mqtt_mux;
 use crate::mqtt_mux::MqttMux;
 pub mod urukul;
 use crate::urukul::Urukul;
+pub mod flash;
+use crate::flash::read_flash;
 
 mod logger;
 
@@ -104,6 +104,12 @@ fn main() -> ! {
 
     cp.DWT.enable_cycle_counter();
 
+    // Acquire client/broker IP Address, client MAC address from flash memory
+    let (ipv4_addr_cidr, mac_addr, broker_ipv4_addr, device_name) = {
+        let mut addr = 0x08100000;
+        read_flash(&mut addr)
+    };
+
     let gpioa = dp.GPIOA.split(ccdr.peripheral.GPIOA);
     let gpiob = dp.GPIOB.split(ccdr.peripheral.GPIOB);
     let gpioc = dp.GPIOC.split(ccdr.peripheral.GPIOC);
@@ -112,58 +118,6 @@ fn main() -> ! {
     let gpiof = dp.GPIOF.split(ccdr.peripheral.GPIOF);
     let gpiog = dp.GPIOG.split(ccdr.peripheral.GPIOG);
 
-    // Acquire client/broker IP Address, client MAC address from flash memory
-    let ipv4_addr_cidr = unsafe {
-        let ipv4_bits = core::ptr::read(0x08100000 as *const u64);
-        net::wire::IpCidr::new(
-            net::wire::IpAddress::v4(
-                ((ipv4_bits >> 32) & 0xFF).try_into().unwrap(),
-                ((ipv4_bits >> 24) & 0xFF).try_into().unwrap(),
-                ((ipv4_bits >> 16) & 0xFF).try_into().unwrap(),
-                ((ipv4_bits >>  8) & 0xFF).try_into().unwrap()
-            ),
-            ((ipv4_bits >>  0) & 0xFF).try_into().unwrap()
-        )
-    };
-
-    let mac_addr = unsafe {
-        let mac_bits = core::ptr::read(0x08100020 as *const u64);
-        net::wire::EthernetAddress([
-            ((mac_bits >> 40) & 0xFF).try_into().unwrap(),
-            ((mac_bits >> 32) & 0xFF).try_into().unwrap(),
-            ((mac_bits >> 24) & 0xFF).try_into().unwrap(),
-            ((mac_bits >> 16) & 0xFF).try_into().unwrap(),
-            ((mac_bits >>  8) & 0xFF).try_into().unwrap(),
-            (mac_bits & 0xFF).try_into().unwrap(),
-        ])
-    };
-
-    let broker_ipv4_addr = unsafe {
-        let ipv4_bits = core::ptr::read(0x08100040 as *const u64);
-        Ipv4Addr::new(
-            ((ipv4_bits >> 24) & 0xFF).try_into().unwrap(),
-            ((ipv4_bits >> 16) & 0xFF).try_into().unwrap(),
-            ((ipv4_bits >>  8) & 0xFF).try_into().unwrap(),
-            ((ipv4_bits >>  0) & 0xFF).try_into().unwrap()
-        )
-    };
-
-    let device_name: String<U32> = unsafe {
-        let mut name = String::new();
-        let mut addr = 0x08100060;
-        loop {
-            let c = core::ptr::read(addr as *const u8);
-            if c == 4 {
-                break;
-            } else {
-                name.push(c as char).unwrap();
-                addr += 1;
-            }
-        }
-        name
-    };
-
-
     // Note: ITM doesn't work beyond this, due to a pin conflict between:
     // - FPGA_SPI: SCK  (af5)
     // - ST_LINK SWO    (af0)