kai/pounder_test
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rxdr: 16 bit

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This commit is contained in:
Robert Jördens 2019-03-20 13:48:28 +00:00
parent 263784ff13
commit 52a3f8c4b7
1 changed files with 5 additions and 2 deletions
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7
src/main.rs
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@ -369,6 +369,8 @@ fn main() -> ! {
// at least one SCK between EOT and CSTART // at least one SCK between EOT and CSTART
spi2.cr1.modify(|r, w| unsafe { w.bits(r.bits() | (1 << 9)) }); spi2.cr1.modify(|r, w| unsafe { w.bits(r.bits() | (1 << 9)) });
let txdr = &spi2.txdr as *const _ as *mut u16;
let rxdr = &spi1.rxdr as *const _ as *const u16;
loop { loop {
#[cfg(feature = "bkpt")] #[cfg(feature = "bkpt")]
cortex_m::asm::bkpt(); cortex_m::asm::bkpt();
@ -380,13 +382,14 @@ fn main() -> ! {
if spi1.sr.read().rxp().bit_is_clear() { if spi1.sr.read().rxp().bit_is_clear() {
continue; continue;
} }
let a = spi1.rxdr.read().rxdr().bits() as i16; // let a = spi1.rxdr.read().rxdr().bits() as i16;
let a = unsafe { ptr::read_volatile(rxdr) };
let d = (a as u16) ^ 0x8000; let d = (a as u16) ^ 0x8000;
if spi2.sr.read().txp().bit_is_clear() { if spi2.sr.read().txp().bit_is_clear() {
continue; continue;
} }
let txdr = &spi2.txdr as *const _ as *mut u16; // needs to be a half word write
unsafe { ptr::write_volatile(txdr, d) }; unsafe { ptr::write_volatile(txdr, d) };
while spi2.sr.read().txc().bit_is_clear() {} while spi2.sr.read().txc().bit_is_clear() {}