use cortex_m; use tm4c129x; use board; pub const BLOCK_COUNT: u16 = 96; pub const BLOCK_LEN: usize = 64; fn wait_done() { while cortex_m::interrupt::free(|cs| { let eeprom = tm4c129x::EEPROM.borrow(cs); eeprom.eedone.read().working().bit() }) {}; } pub fn init() { cortex_m::interrupt::free(|cs| { let sysctl = tm4c129x::SYSCTL.borrow(cs); sysctl.rcgceeprom.modify(|_, w| w.r0().bit(true)); // Bring up EEPROM board::delay(16); sysctl.sreeprom.modify(|_, w| w.r0().bit(true)); // Activate EEPROM reset board::delay(16); sysctl.sreeprom.modify(|_, w| w.r0().bit(false)); // Dectivate EEPROM reset board::delay(16); while !sysctl.preeprom.read().r0().bit() {} // Wait for the EEPROM to come out of reset board::delay(16); }); wait_done(); } pub fn read_block(buffer: &mut [u8; BLOCK_LEN], block: u16) { assert!(block < BLOCK_COUNT); cortex_m::interrupt::free(|cs| { let eeprom = tm4c129x::EEPROM.borrow(cs); eeprom.eeblock.write(|w| unsafe { w.block().bits(block) }); eeprom.eeoffset.write(|w| unsafe { w.offset().bits(0) }); for i in 0..BLOCK_LEN/4 { let word = eeprom.eerdwrinc.read().bits(); buffer[4*i] = word as u8; buffer[4*i+1] = (word >> 8) as u8; buffer[4*i+2] = (word >> 16) as u8; buffer[4*i+3] = (word >> 24) as u8; } }); } pub fn write_block(buffer: &[u8; BLOCK_LEN], block: u16) { assert!(block < BLOCK_COUNT); cortex_m::interrupt::free(|cs| { let eeprom = tm4c129x::EEPROM.borrow(cs); eeprom.eeblock.write(|w| unsafe { w.block().bits(block) }); eeprom.eeoffset.write(|w| unsafe { w.offset().bits(0) }); }); for i in 0..BLOCK_LEN/4 { let word = buffer[4*i] as u32 | (buffer[4*i+1] as u32) << 8 | (buffer[4*i+2] as u32) << 16 | (buffer[4*i+3] as u32) << 24; cortex_m::interrupt::free(|cs| { let eeprom = tm4c129x::EEPROM.borrow(cs); eeprom.eerdwrinc.write(|w| unsafe { w.bits(word) }); }); board::delay(16); wait_done(); } }