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implement pca9539 and runtime io-expander chip selection

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better comments and address translation

fix spurious };

unwrap init in runtime and return err instead of panic

propagate error

del unnecessary use

Signed-off-by: SingularitySurfer <Norman_Krackow@gmx.de>
This commit is contained in:
SingularitySurfer 2022-12-12 17:24:32 +00:00 committed by Sebastien Bourdeauducq
parent fe32104185
commit ce57d6c346
3 changed files with 65 additions and 17 deletions
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74
artiq/firmware/libboard_misoc/io_expander.rs
View File

@ -1,5 +1,14 @@
use i2c;
use csr;
use i2c;
// Only the bare minimum registers. Bits/IO connections equivalent between IC types.
struct Registers {
// PCA9539 equivalent register names in comments
iodira: u8, // Configuration Port 0
iodirb: u8, // Configuration Port 1
gpioa: u8, // Output Port 0
gpiob: u8, // Output Port 1
}
pub struct IoExpander {
busno: u8,
@ -9,15 +18,17 @@ pub struct IoExpander {
iodir: [u8; 2],
out_current: [u8; 2],
out_target: [u8; 2],
registers: Registers,
}
impl IoExpander {
#[cfg(all(soc_platform = "kasli", hw_rev = "v2.0"))]
pub fn new(index: u8) -> Self {
pub fn new(index: u8) -> Result<Self, &'static str> {
const VIRTUAL_LED_MAPPING0: [(u8, u8, u8); 2] = [(0, 0, 6), (1, 1, 6)];
const VIRTUAL_LED_MAPPING1: [(u8, u8, u8); 2] = [(2, 0, 6), (3, 1, 6)];
// Both expanders on SHARED I2C bus
match index {
let mut io_expander = match index {
0 => IoExpander {
busno: 0,
port: 11,
@ -26,6 +37,12 @@ impl IoExpander {
iodir: [0xff; 2],
out_current: [0; 2],
out_target: [0; 2],
registers: Registers {
iodira: 0x00,
iodirb: 0x01,
gpioa: 0x12,
gpiob: 0x13,
},
},
1 => IoExpander {
busno: 0,
@ -35,9 +52,33 @@ impl IoExpander {
iodir: [0xff; 2],
out_current: [0; 2],
out_target: [0; 2],
registers: Registers {
iodira: 0x00,
iodirb: 0x01,
gpioa: 0x12,
gpiob: 0x13,
},
},
_ => panic!("incorrect I/O expander index"),
_ => return Err("incorrect I/O expander index"),
};
if !io_expander.check_ack()? {
#[cfg(feature = "log")]
log::info!(
"MCP23017 io expander {} not found. Checking for PCA9539.",
index
);
io_expander.address += 0xa8; // translate to PCA9539 addresses (see schematic)
io_expander.registers = Registers {
iodira: 0x06,
iodirb: 0x07,
gpioa: 0x02,
gpiob: 0x03,
};
if !io_expander.check_ack()? {
return Err("Neither MCP23017 nor PCA9539 io expander found.");
};
}
Ok(io_expander)
}
#[cfg(soc_platform = "kasli")]
@ -57,9 +98,18 @@ impl IoExpander {
Ok(())
}
fn check_ack(&self) -> Result<bool, &'static str> {
// Check for ack from io expander
self.select()?;
i2c::start(self.busno)?;
let ack = i2c::write(self.busno, self.address)?;
i2c::stop(self.busno)?;
Ok(ack)
}
fn update_iodir(&self) -> Result<(), &'static str> {
self.write(0x00, self.iodir[0])?;
self.write(0x01, self.iodir[1])?;
self.write(self.registers.iodira, self.iodir[0])?;
self.write(self.registers.iodirb, self.iodir[1])?;
Ok(())
}
@ -72,9 +122,9 @@ impl IoExpander {
self.update_iodir()?;
self.out_current[0] = 0x00;
self.write(0x12, 0x00)?;
self.write(self.registers.gpioa, 0x00)?;
self.out_current[1] = 0x00;
self.write(0x13, 0x00)?;
self.write(self.registers.gpiob, 0x00)?;
Ok(())
}
@ -94,20 +144,18 @@ impl IoExpander {
pub fn service(&mut self) -> Result<(), &'static str> {
for (led, port, bit) in self.virtual_led_mapping.iter() {
let level = unsafe {
(csr::virtual_leds::status_read() >> led) & 1
};
let level = unsafe { (csr::virtual_leds::status_read() >> led) & 1 };
self.set(*port, *bit, level != 0);
}
if self.out_target != self.out_current {
self.select()?;
if self.out_target[0] != self.out_current[0] {
self.write(0x12, self.out_target[0])?;
self.write(self.registers.gpioa, self.out_target[0])?;
self.out_current[0] = self.out_target[0];
}
if self.out_target[1] != self.out_current[1] {
self.write(0x13, self.out_target[1])?;
self.write(self.registers.gpiob, self.out_target[1])?;
self.out_current[1] = self.out_target[1];
}
}

4
artiq/firmware/runtime/main.rs
View File

@ -100,8 +100,8 @@ fn startup() {
let (mut io_expander0, mut io_expander1);
#[cfg(all(soc_platform = "kasli", hw_rev = "v2.0"))]
{
io_expander0 = board_misoc::io_expander::IoExpander::new(0);
io_expander1 = board_misoc::io_expander::IoExpander::new(1);
io_expander0 = board_misoc::io_expander::IoExpander::new(0).unwrap();
io_expander1 = board_misoc::io_expander::IoExpander::new(1).unwrap();
io_expander0.init().expect("I2C I/O expander #0 initialization failed");
io_expander1.init().expect("I2C I/O expander #1 initialization failed");

4
artiq/firmware/satman/main.rs
View File

@ -486,8 +486,8 @@ pub extern fn main() -> i32 {
let (mut io_expander0, mut io_expander1);
#[cfg(all(soc_platform = "kasli", hw_rev = "v2.0"))]
{
io_expander0 = board_misoc::io_expander::IoExpander::new(0);
io_expander1 = board_misoc::io_expander::IoExpander::new(1);
io_expander0 = board_misoc::io_expander::IoExpander::new(0).unwrap();
io_expander1 = board_misoc::io_expander::IoExpander::new(1).unwrap();
io_expander0.init().expect("I2C I/O expander #0 initialization failed");
io_expander1.init().expect("I2C I/O expander #1 initialization failed");