76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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//-------------------------------------------------------------------------
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//-------------------------------------------------------------------------
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extern void jazelle_main(void);
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#define GPFSEL1 (*(volatile uint32_t*)0x20200004)
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#define GPSET0 (*(volatile uint32_t*)0x2020001C)
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#define GPCLR0 (*(volatile uint32_t*)0x20200028)
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#define GPPUD (*(volatile uint32_t*)0x20200094)
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#define GPPUDCLK0 (*(volatile uint32_t*)0x20200098)
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#define AUX_ENABLES (*(volatile uint32_t*)0x20215004)
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#define AUX_MU_IO_REG (*(volatile uint32_t*)0x20215040)
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#define AUX_MU_IER_REG (*(volatile uint32_t*)0x20215044)
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#define AUX_MU_IIR_REG (*(volatile uint32_t*)0x20215048)
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#define AUX_MU_LCR_REG (*(volatile uint32_t*)0x2021504C)
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#define AUX_MU_MCR_REG (*(volatile uint32_t*)0x20215050)
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#define AUX_MU_LSR_REG (*(volatile uint32_t*)0x20215054)
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#define AUX_MU_MSR_REG (*(volatile uint32_t*)0x20215058)
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#define AUX_MU_SCRATCH (*(volatile uint32_t*)0x2021505C)
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#define AUX_MU_CNTL_REG (*(volatile uint32_t*)0x20215060)
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#define AUX_MU_STAT_REG (*(volatile uint32_t*)0x20215064)
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#define AUX_MU_BAUD_REG (*(volatile uint32_t*)0x20215068)
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void uart_putc(char c) {
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while (!(AUX_MU_LSR_REG & 0x20)) asm volatile("nop");
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AUX_MU_IO_REG = c;
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}
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void uart_puts(const char* s) {
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for (; s && *s; ++s) {
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uart_putc(*s);
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}
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}
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void uart_putdata(const uint8_t* p, size_t size) {
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for (size_t i = 0; i < size; ++i) {
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uart_putc((char)p[i]);
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}
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}
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int main() {
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AUX_ENABLES=1;
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AUX_MU_IER_REG=0;
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AUX_MU_CNTL_REG=0;
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AUX_MU_LCR_REG=3;
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AUX_MU_MCR_REG=0;
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AUX_MU_IER_REG=0;
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AUX_MU_IIR_REG=0xC6;
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AUX_MU_BAUD_REG=270;
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uint32_t ra = GPFSEL1;
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ra&=~(7<<12); //gpio14
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ra|=2<<12; //alt5
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GPFSEL1=ra;
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GPPUD=0;
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for (int ra=0;ra<150;ra++) asm volatile("nop");
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GPPUDCLK0=(1<<14);
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for (int ra=0;ra<150;ra++) asm volatile("nop");
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GPPUDCLK0=0;
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AUX_MU_CNTL_REG=2;
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//uart_putc('A');
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jazelle_main();
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return 0;
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}
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