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#include <drivers/uart.h>
#include <lib/kmem.h>
#include <lib/strings.h>
#include <sys/core.h>
#include <sys/schedule.h>
#include <symbols.h>
#include <util/lock.h>
#define UART_BUFFER_SIZE 0x400
struct UartBuffer {
char buffer[UART_BUFFER_SIZE];
unsigned long roffset;
unsigned long woffset;
struct Lock l;
} ubuffer;
void uart_init(void)
{
ubuffer.roffset = 0;
ubuffer.woffset = 0;
ubuffer.l.pid = 0;
// Disable UART0
store32(0x0, UART0_CR);
// Setup GPIO on pin 14 and 15
store32(0x0, (unsigned long)GPPUD);
delay(150);
store32((1 << 14) | (1 << 15), (unsigned long)GPPUDCLK0);
delay(150);
store32(0x0, (unsigned long)GPPUDCLK0);
// Clear pending interrupts
store32(0x7FF, UART0_ICR);
// Set to 3Mhz
store32(9, UART0_IBRD);
store32(49, UART0_FBRD);
// Enable FIFO and 8 bit transmission
store32((1<<4)|(1<<5)|(1<<6), UART0_LCRH);
// Mask all interrupts
store32((1<<1)|(1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)|(1<<10), UART0_IMSC);
// Interrupt when FIFO is 1/8 full
store32((UART_FIFO_18 << 3) | (UART_FIFO_12 << 0), UART0_IFLS);
// Enable UART0
store32((1<<0)|(1<<8)|(1<<9), UART0_CR);
}
// s = zero-terminated string
void* uart_print(char* s)
{
lock(&ubuffer.l);
char* ptr = s;
while (1) {
if (*ptr == 0)
break;
ubuffer.buffer[ubuffer.woffset] = *ptr;
if ((ubuffer.woffset+1)%UART_BUFFER_SIZE == ubuffer.roffset)
return ptr;
ubuffer.woffset++;
ubuffer.woffset %= UART_BUFFER_SIZE;
ptr += 1;
}
// Low priority flush run whenever
add_thread_without_duplicate(uart_flush, 0, PRIORITIES-1);
unlock(&ubuffer.l);
return 0;
}
void uart_flush(void)
{
while (ubuffer.roffset != ubuffer.woffset) {
uart_char(ubuffer.buffer[ubuffer.roffset++]);
ubuffer.roffset %= UART_BUFFER_SIZE;
}
}
void uart_10(unsigned long val)
{
char* dptr = u32_to_str(val);
uart_string(dptr);
}
void uart_hexn(unsigned long c_val)
{
uart_hex(c_val);
uart_char('\n');
}
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