160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
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//-------------------------------------------------------------------------
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//-------------------------------------------------------------------------
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extern void PUT32 ( unsigned int, unsigned int );
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extern unsigned int GET32 ( unsigned int );
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extern void dummy ( unsigned int );
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#define GPFSEL1 0x3F200004
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#define GPSET0 0x3F20001C
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#define GPCLR0 0x3F200028
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#define GPPUD 0x3F200094
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#define GPPUDCLK0 0x3F200098
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#define AUX_ENABLES 0x3F215004
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#define AUX_MU_IO_REG 0x3F215040
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#define AUX_MU_IER_REG 0x3F215044
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#define AUX_MU_IIR_REG 0x3F215048
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#define AUX_MU_LCR_REG 0x3F21504C
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#define AUX_MU_MCR_REG 0x3F215050
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#define AUX_MU_LSR_REG 0x3F215054
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#define AUX_MU_MSR_REG 0x3F215058
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#define AUX_MU_SCRATCH 0x3F21505C
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#define AUX_MU_CNTL_REG 0x3F215060
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#define AUX_MU_STAT_REG 0x3F215064
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#define AUX_MU_BAUD_REG 0x3F215068
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//GPIO14 TXD0 and TXD1
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//GPIO15 RXD0 and RXD1
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//alt function 5 for uart1
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//alt function 0 for uart0
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//((250,000,000/115200)/8)-1 = 270
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//GPIO14 TXD0 and TXD1
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//GPIO15 RXD0 and RXD1
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//------------------------------------------------------------------------
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unsigned int uart_lcr ( void )
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{
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return(GET32(AUX_MU_LSR_REG));
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}
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//------------------------------------------------------------------------
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unsigned int uart_recv ( void )
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{
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while(1)
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{
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if(GET32(AUX_MU_LSR_REG)&0x01) break;
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}
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return(GET32(AUX_MU_IO_REG)&0xFF);
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}
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//------------------------------------------------------------------------
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unsigned int uart_check ( void )
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{
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if(GET32(AUX_MU_LSR_REG)&0x01) return(1);
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return(0);
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}
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//------------------------------------------------------------------------
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void uart_send ( unsigned int c )
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{
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while(1)
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{
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if(GET32(AUX_MU_LSR_REG)&0x20) break;
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}
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PUT32(AUX_MU_IO_REG,c);
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}
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//------------------------------------------------------------------------
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void uart_flush ( void )
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{
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while(1)
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{
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if((GET32(AUX_MU_LSR_REG)&0x100)==0) break;
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}
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}
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//------------------------------------------------------------------------
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void hexstrings ( unsigned int d )
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{
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//unsigned int ra;
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unsigned int rb;
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unsigned int rc;
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rb=32;
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while(1)
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{
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rb-=4;
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rc=(d>>rb)&0xF;
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if(rc>9) rc+=0x37; else rc+=0x30;
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uart_send(rc);
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if(rb==0) break;
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}
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uart_send(0x20);
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}
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//------------------------------------------------------------------------
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void hexstring ( unsigned int d )
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{
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hexstrings(d);
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uart_send(0x0D);
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uart_send(0x0A);
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}
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//------------------------------------------------------------------------
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void uart_init ( void )
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{
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unsigned int ra;
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PUT32(AUX_ENABLES,1);
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PUT32(AUX_MU_IER_REG,0);
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PUT32(AUX_MU_CNTL_REG,0);
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PUT32(AUX_MU_LCR_REG,3);
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PUT32(AUX_MU_MCR_REG,0);
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PUT32(AUX_MU_IER_REG,0);
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PUT32(AUX_MU_IIR_REG,0xC6);
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PUT32(AUX_MU_BAUD_REG,270);
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ra=GET32(GPFSEL1);
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ra&=~(7<<12); //gpio14
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ra|=2<<12; //alt5
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ra&=~(7<<15); //gpio15
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ra|=2<<15; //alt5
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PUT32(GPFSEL1,ra);
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PUT32(GPPUD,0);
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for(ra=0;ra<150;ra++) dummy(ra);
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PUT32(GPPUDCLK0,(1<<14)|(1<<15));
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for(ra=0;ra<150;ra++) dummy(ra);
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PUT32(GPPUDCLK0,0);
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PUT32(AUX_MU_CNTL_REG,3);
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}
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//------------------------------------------------------------------------
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int notmain ( unsigned int pc )
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{
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unsigned int ra;
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uart_init();
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hexstring(0x12345678);
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hexstring(0x87654321);
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hexstring(pc);
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while(1)
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{
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ra=uart_recv();
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if(ra==0x0D) uart_send(0x0A);
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uart_send(ra);
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}
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return(0);
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}
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//-------------------------------------------------------------------------
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//-------------------------------------------------------------------------
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//-------------------------------------------------------------------------
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//
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// Copyright (c) 2012 David Welch dwelch@dwelch.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-------------------------------------------------------------------------
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