58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
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#define GPIO_FUNC_SEL0 0x80000018 /* GPIO 15 - 0; 2 bit blocks */
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#define GPIO_FUNC_SEL1 0x8000001c /* GPIO 16 - 31; 2 bit blocks*/
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#define BASE_UART1 0x80005000
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#define UART1_CON 0x80005000
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#define UART1_STAT 0x80005004
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#define UART1_DATA 0x80005008
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#define UR1CON 0x8000500c
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#define UT1CON 0x80005010
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#define UART1_CTS 0x80005014
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#define UART1_BR 0x80005018
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#include "embedded_types.h"
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#define DELAY 1000
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void main(void) {
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volatile uint32_t i;
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*(volatile uint32_t *)GPIO_FUNC_SEL0 = (0x01 << (14*2)); /* set GPIO14 to UART (UART1 TX)*/
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// *(volatile uint32_t *)GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) || (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
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*(volatile uint32_t *)UART1_BR = 0x004C03E8; /* Baud rate: (INC<<16 || MOD) */ /* is 115200 @ 24 MHz --- unexplained */
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*(volatile uint32_t *)UART1_CON = 0x00000003; /* enable receive and transmit */
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while(1) {
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for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = 'H';
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/* for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = 'e';
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for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = 'l';
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for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = 'l';
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for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = 'o';
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for(i=0; i<DELAY; i++) { continue; }
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*(volatile uint32_t *)UART1_DATA = ' ';
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*(volatile uint32_t *)UART1_DATA = 'W';
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*(volatile uint32_t *)UART1_DATA = 'o';
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*(volatile uint32_t *)UART1_DATA = 'r';
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*(volatile uint32_t *)UART1_DATA = 'l';
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*(volatile uint32_t *)UART1_DATA = 'd';
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*(volatile uint32_t *)UART1_DATA = '\n';
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*(volatile uint32_t *)UART1_DATA = '\r';*/
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}
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/* while(1) { */
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/* if(*(volatile uint32_t*)UR1CON > 0) { */
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/* /\* Receive buffer isn't empty *\/ */
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/* /\* read a byte and write it to the transmit buffer *\/ */
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/* } */
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/* }; */
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}
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