Feat: gura!!!

kernel/lib/uart.c

@@ -8,6 +8,7 @@
 #include <gpio.h>
 #include <stddef.h>
 #include <ringbuffer.h>
+#include <thread.h>
 
 /* Auxilary mini UART registers */
 #define AUX_ENABLE      ((volatile uint32_t*)(MMIO_BASE + 0x00215004))
@@ -81,8 +82,8 @@ void uart_init(void)
   _uart_enable_transmit_interrupt(false);
   // uint64_t ier = *AUX_MU_IER;
 
-  // uart_getb = uart_getb_async;
-  // uart_putb = uart_putb_async;
+  uart_getb = uart_getb_async;
+  uart_putb = uart_putb_async;
 
   is_uart_inited = true;
 }
@@ -145,11 +146,12 @@ void uart_irq_handler(void)
 size_t uart_putb_async(const uint8_t *bytes, size_t len)
 {
   size_t sentlen = 0;
-  for (; sentlen < len; ++bytes, ++sentlen)
-    ringbuffer_push(uart_writebuf, *bytes);
-  
-  if (!is_uart_in_interrupt_queue && uart_writebuf)
-    _enable_uart_interrupt();
+  for (; sentlen < len; ++bytes, ++sentlen) {
+    while(!_uart_transmitter_idle())
+      yield();
+
+    _uart_write_data(*bytes);
+  }
 
   return sentlen;
 }
@@ -171,10 +173,10 @@ size_t uart_getb_async(uint8_t *bytes, size_t len)
 {
   size_t recvlen = 0;
   for (; recvlen < len; ++bytes, ++recvlen) {
-    while (!uart_readbuf->size)
-      wfe(); // wait for interrupt
-  
-    *bytes = ringbuffer_bump(uart_readbuf);
+    while (!_uart_data_ready())
+      yield();
+
+    *bytes = _uart_read_data();
   }
 
   return recvlen;