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working test loopback. Baudrate value is still unexplained.

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This commit is contained in:
Mariano Alvira 2009-03-30 15:52:15 -04:00
parent ffcae0d070
commit 880c75d989
1 changed files with 8 additions and 28 deletions
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36
tests/uart1-loopback.c
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@ -1,5 +1,4 @@
#define GPIO_FUNC_SEL0 0x80000018 /* GPIO 15 - 0; 2 bit blocks */ #define GPIO_FUNC_SEL0 0x80000018 /* GPIO 15 - 0; 2 bit blocks */
#define GPIO_FUNC_SEL1 0x8000001c /* GPIO 16 - 31; 2 bit blocks*/
#define BASE_UART1 0x80005000 #define BASE_UART1 0x80005000
#define UART1_CON 0x80005000 #define UART1_CON 0x80005000
@ -12,10 +11,7 @@
#include "embedded_types.h" #include "embedded_types.h"
#define DELAY 100000
void main(void) { void main(void) {
/* Restore UART regs. to default */ /* Restore UART regs. to default */
/* in case there is still bootloader state leftover */ /* in case there is still bootloader state leftover */
@ -31,29 +27,13 @@ void main(void) {
*(volatile uint32_t *)UART1_CON = 0x00000003; /* enable receive and transmit */ *(volatile uint32_t *)UART1_CON = 0x00000003; /* enable receive and transmit */
*(volatile uint32_t *)GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) | (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/ *(volatile uint32_t *)GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) | (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
uint32_t i; uint8_t c;
while(1) { while(1) {
for(i=0; i<DELAY; i++) { continue; } if(*(volatile uint32_t*)UR1CON > 0) {
*(volatile uint32_t *)UART1_DATA = 'H'; /* Receive buffer isn't empty */
for(i=0; i<DELAY; i++) { continue; } /* read a byte and write it to the transmit buffer */
*(volatile uint32_t *)UART1_DATA = 'e'; c = *(volatile uint32_t *)UART1_DATA;
for(i=0; i<DELAY; i++) { continue; } *(volatile uint32_t *)UART1_DATA = c;
*(volatile uint32_t *)UART1_DATA = 'l'; }
for(i=0; i<DELAY; i++) { continue; } };
*(volatile uint32_t *)UART1_DATA = 'l';
for(i=0; i<DELAY; i++) { continue; }
*(volatile uint32_t *)UART1_DATA = 'o';
for(i=0; i<DELAY; i++) { continue; }
*(volatile uint32_t *)UART1_DATA = '\n';
for(i=0; i<DELAY; i++) { continue; }
*(volatile uint32_t *)UART1_DATA = '\r';
}
/* while(1) { */
/* if(*(volatile uint32_t*)UR1CON > 0) { */
/* /\* Receive buffer isn't empty *\/ */
/* /\* read a byte and write it to the transmit buffer *\/ */
/* } */
/* }; */
} }