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uart Rx in loader now seems to work.

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This commit is contained in:
bunnie 2024-01-18 19:09:49 +08:00
parent a0e464bcee
commit f12ddb09cb
1 changed files with 11 additions and 5 deletions
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16
loader/src/platform/cramium/cramium.rs
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@ -100,6 +100,10 @@ pub fn early_init() {
// tx as output
iox.set_gpio_dir(IoxPort::PA, 4, IoxDir::Output);
// This is necessary because an input has to be "high" on an alternate mux for it to work... :-/
iox.set_gpio_dir(IoxPort::PD, 13, IoxDir::Input);
iox.set_gpio_pullup(IoxPort::PD, 13, IoxEnable::Enable);
// Set up the UDMA_UART block to the correct baud rate and enable status
let mut udma_global = udma::GlobalConfig::new(utra::udma_ctrl::HW_UDMA_CTRL_BASE as *mut u32);
udma_global.clock_on(udma::PeriphId::Uart0);
@ -122,7 +126,9 @@ pub fn early_init() {
udma::Uart::new(utra::udma_uart_0::HW_UDMA_UART_0_BASE, baudrate, freq)
};
// Board bringup: send characters to confirm the UART is configured & ready to go for the logging crate!
// Board bring-up: send characters to confirm the UART is configured & ready to go for the logging crate!
// The "boot gutter" also has a role to pause the system in "real mode" before VM is mapped in Xous
// makes things a little bit cleaner for JTAG ops, it seems.
#[cfg(feature = "board-bringup")]
{
let tx_buf = unsafe {
@ -133,17 +139,17 @@ pub fn early_init() {
// safety: it's safe only because we are manually tracking the allocations in IFRAM0. Yuck!
core::slice::from_raw_parts_mut((utralib::HW_IFRAM0_MEM + 256) as *mut u8, 1)
};
const BANNER: &'static str = "\n\rHit any key to continue boot...\r";
const BANNER: &'static str = "\n\rHit any key to continue boot...\r\n";
tx_buf[..BANNER.len()].copy_from_slice(BANNER.as_bytes());
udma_uart.write(&tx_buf[0..BANNER.len()]);
// receive characters
for _ in 0..16 {
// receive characters -- print them back. just to prove that this works.
for _ in 0..4 {
udma_uart.read(rx_buf);
tx_buf[0] = rx_buf[0];
const DBG_MSG: &'static str = "Got: ";
tx_buf[..DBG_MSG.len()].copy_from_slice(DBG_MSG.as_bytes());
udma_uart.write(&tx_buf[0..DBG_MSG.len()]);
tx_buf[0] = rx_buf[0];
udma_uart.write(&tx_buf[0..1]);
tx_buf[0] = '\n' as u32 as u8;
tx_buf[1] = '\r' as u32 as u8;