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