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add EEPROM driver

pull/1/head
Alexander Shafir 2017-08-07 12:27:44 +08:00 committed by Sebastien Bourdeauducq
parent dcd2a57aa4
commit f94b50e9ab
1 changed files with 123 additions and 0 deletions
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firmware/src/eeprom.rs Normal file
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use core::fmt;
use cortex_m;
use tm4c129x;
use ethmac::delay;
const EEPROM_BLK_COUNT: u16 = 96; // Number of the blocks
const EEPROM_BLK_U32_LEN: u16 = 16; // Number of the words in a block
const EEPROM_PRETRY: u32 = 0x00000004; // Programming Must Be Retried
const EEPROM_ERETRY: u32 = 0x00000008; // Erase Must Be Retried
fn wait_done() {
unsafe {
let eeprom = tm4c129x::EEPROM.get();
// Make sure the EEPROM is idle
while (*eeprom).eedone.read().working().bit() {};
}
}
pub fn init() -> u32 {
let status: u32 = 0;
cortex_m::interrupt::free(|cs| {
let sysctl = tm4c129x::SYSCTL.borrow(cs);
let eeprom = tm4c129x::EEPROM.borrow(cs);
sysctl.rcgceeprom.modify(|_, w| w.r0().bit(true)); // Bring up EEPROM
delay(16);
let eesupp1 = eeprom.eesupp.read().bits();
if 0 != eesupp1 & (EEPROM_PRETRY | EEPROM_ERETRY) {
println!("eesupp1:{}", eesupp1)
}
sysctl.sreeprom.modify(|_, w| w.r0().bit(true)); // Activate EEPROM reset
delay(16);
sysctl.sreeprom.modify(|_, w| w.r0().bit(false)); // Dectivate EEPROM reset
delay(16);
while !sysctl.preeprom.read().r0().bit() {} // Wait for the EEPROM to come out of reset
delay(16);
wait_done();
let eesupp2 = eeprom.eesupp.read().bits();
if 0 != eesupp2 & (EEPROM_PRETRY | EEPROM_ERETRY) {
println!("eesupp2:{}", eesupp2)
}
let eesize_blkcnt = eeprom.eesize.read().blkcnt().bits();
println!("EESIZE_BLK:{}", eesize_blkcnt)
});
status
}
pub fn mass_erase() {
wait_done();
cortex_m::interrupt::free(|cs| {
let eeprom = tm4c129x::EEPROM.borrow(cs);
eeprom.eedbgme.write(|w| unsafe { w.key().bits(0xE37B).me().bit(true) });
});
wait_done();
cortex_m::interrupt::free(|cs| {
let sysctl = tm4c129x::SYSCTL.borrow(cs);
let eeprom = tm4c129x::EEPROM.borrow(cs);
sysctl.sreeprom.modify(|_, w| w.r0().bit(true)); // Activate EEPROM reset
delay(16);
sysctl.sreeprom.modify(|_, w| w.r0().bit(false)); // Dectivate EEPROM reset
delay(16);
while !sysctl.preeprom.read().r0().bit() {} // Wait for the EEPROM to come out of reset
delay(16);
});
wait_done();
cortex_m::interrupt::free(|cs| {
let sysctl = tm4c129x::SYSCTL.borrow(cs);
let eeprom = tm4c129x::EEPROM.borrow(cs);
let eesupp2 = eeprom.eesupp.read().bits();
if 0 != eesupp2 & (EEPROM_PRETRY | EEPROM_ERETRY) {
println!("eesupp2:{}", eesupp2)
} else {
println!("erase_ok");
}
});
}
pub fn read_blk(buf: &mut [u32; 16], blk: u16, verify: bool) -> u8 {
let mut result : u8 = 0;
assert!(blk < EEPROM_BLK_COUNT);
wait_done();
cortex_m::interrupt::free(|cs| {
let eeprom = tm4c129x::EEPROM.borrow(cs);
eeprom.eeblock.write(|w| unsafe { w.block().bits(blk) });
eeprom.eeoffset.write(|w| unsafe { w.offset().bits(0) });
});
for i in 0..EEPROM_BLK_U32_LEN {
cortex_m::interrupt::free(|cs| {
let eeprom = tm4c129x::EEPROM.borrow(cs);
if verify {
if buf[i as usize] != eeprom.eerdwrinc.read().bits() {
result += 1;
}
} else {
buf[i as usize] = eeprom.eerdwrinc.read().bits();
}
});
}
result
}
pub fn write_blk(buf: &[u32; 16], blk: u16) -> u8 {
assert!(blk < EEPROM_BLK_COUNT);
wait_done();
cortex_m::interrupt::free(|cs| {
let eeprom = tm4c129x::EEPROM.borrow(cs);
eeprom.eeblock.write(|w| unsafe { w.block().bits(blk) });
eeprom.eeoffset.write(|w| unsafe { w.offset().bits(0) });
});
for i in 0..EEPROM_BLK_U32_LEN {
cortex_m::interrupt::free(|cs| {
let eeprom = tm4c129x::EEPROM.borrow(cs);
eeprom.eerdwrinc.write(|w| unsafe { w.bits(buf[i as usize]) });
});
delay(16);
wait_done();
}
0
}