jacking/rpi/rpi.c

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>

//-------------------------------------------------------------------------
//-------------------------------------------------------------------------

extern void jazelle_main(void);

#define GPFSEL1 (*(volatile uint32_t*)0x20200004)
#define GPSET0  (*(volatile uint32_t*)0x2020001C)
#define GPCLR0  (*(volatile uint32_t*)0x20200028)
#define GPPUD	   (*(volatile uint32_t*)0x20200094)
#define GPPUDCLK0   (*(volatile uint32_t*)0x20200098)

#define AUX_ENABLES	 (*(volatile uint32_t*)0x20215004)
#define AUX_MU_IO_REG   (*(volatile uint32_t*)0x20215040)
#define AUX_MU_IER_REG  (*(volatile uint32_t*)0x20215044)
#define AUX_MU_IIR_REG  (*(volatile uint32_t*)0x20215048)
#define AUX_MU_LCR_REG  (*(volatile uint32_t*)0x2021504C)
#define AUX_MU_MCR_REG  (*(volatile uint32_t*)0x20215050)
#define AUX_MU_LSR_REG  (*(volatile uint32_t*)0x20215054)
#define AUX_MU_MSR_REG  (*(volatile uint32_t*)0x20215058)
#define AUX_MU_SCRATCH  (*(volatile uint32_t*)0x2021505C)
#define AUX_MU_CNTL_REG (*(volatile uint32_t*)0x20215060)
#define AUX_MU_STAT_REG (*(volatile uint32_t*)0x20215064)
#define AUX_MU_BAUD_REG (*(volatile uint32_t*)0x20215068)

void uart_putc(char c) {
	while (!(AUX_MU_LSR_REG & 0x20)) asm volatile("nop");

	AUX_MU_IO_REG = c;
}
void uart_puts(const char* s) {
	for (; s && *s; ++s) {
		uart_putc(*s);
	}
}
void uart_putdata(const uint8_t* p, size_t size) {
	for (size_t i = 0; i < size; ++i) {
		uart_putc((char)p[i]);
	}
}

int main() {
	AUX_ENABLES=1;
	AUX_MU_IER_REG=0;
	AUX_MU_CNTL_REG=0;
	AUX_MU_LCR_REG=3;
	AUX_MU_MCR_REG=0;
	AUX_MU_IER_REG=0;
	AUX_MU_IIR_REG=0xC6;
	AUX_MU_BAUD_REG=270;

	uint32_t ra = GPFSEL1;
	ra&=~(7<<12); //gpio14
	ra|=2<<12;    //alt5
	GPFSEL1=ra;

	GPPUD=0;
	for (int ra=0;ra<150;ra++) asm volatile("nop");
	GPPUDCLK0=(1<<14);
	for (int ra=0;ra<150;ra++) asm volatile("nop");
	GPPUDCLK0=0;

	AUX_MU_CNTL_REG=2;
	//uart_putc('A');

	jazelle_main();

	return 0;
}