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// Source code under CC0 1.0
#include <stdint.h>
#include <stdio.h>
#define CLK_DIVR (*(volatile uint8_t *)0x50c6)
#define CLK_PCKENR1 (*(volatile uint8_t *)0x50c7)
#define UART2_SR (*(volatile uint8_t *)0x5240)
#define UART2_DR (*(volatile uint8_t *)0x5241)
#define UART2_BRR1 (*(volatile uint8_t *)0x5242)
#define UART2_BRR2 (*(volatile uint8_t *)0x5243)
#define UART2_CR2 (*(volatile uint8_t *)0x5245)
#define UART2_CR3 (*(volatile uint8_t *)0x5246)
#define UART_CR2_TEN (1 << 3)
#define UART_CR3_STOP2 (1 << 5)
#define UART_CR3_STOP1 (1 << 4)
#define UART_SR_TXE (1 << 7)
int putchar(int c)
{
while(!(UART2_SR & UART_SR_TXE));
UART2_DR = c;
return c;
}
void main(void)
{
unsigned long i = 0;
int a= 0;
CLK_DIVR = 0x00; // Set the frequency to 16 MHz
CLK_PCKENR1 = 0xFF; // Enable peripherals
UART2_CR2 = UART_CR2_TEN; // Allow TX and RX
UART2_CR3 &= ~(UART_CR3_STOP1 | UART_CR3_STOP2); // 1 stop bit
UART2_BRR2 = 0x03; UART2_BRR1 = 0x68; // 9600 baud
for(;;)
{
printf("Hello World %d %x!\n", a, a);
for(i = 0; i < 147456; i++); // Sleep
a++;
}
}
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