Hi all,
I have tried to write a program for configuring and send a character data over UART,but the NRF52-DK not responding to the code,I successfully flash the code.
Please see the attached code,
#include <stdint.h>
#define GPIO_BASE 0x50000000
#define GPIO_IN (*((uint32_t*) (GPIO_BASE + 0x510)))
#define GPIO_OUTSET (*((uint32_t*) (GPIO_BASE + 0x508)))
#define GPIO_OUTCLR (*((uint32_t*) (GPIO_BASE + 0x50C)))
#define GPIO_PIN_CNF(pin) (*((uint32_t*) (GPIO_BASE + 0x700 + pin * 4)))
#define UART_BASE 0x40002000
#define PSEL_RTS (*((uint32_t*)(UART_BASE + 0x508)))
#define PSEL_TXD (*((uint32_t*)(UART_BASE + 0x50C)))
#define PSEL_CTS (*((uint32_t*)(UART_BASE + 0x510)))
#define PSEL_RXD (*((uint32_t*)(UART_BASE + 0x514)))
#define RXD_BUFF (*((uint32_t*)(UART_BASE + 0x518)))
#define TXD_BUFF (*((uint32_t*)(UART_BASE + 0x51C)))
#define UART_ENABLE (*((uint32_t*)(UART_BASE + 0x500)))
#define UART_CONFIG (*((uint32_t*)(UART_BASE + 0x56C)))
#define UART_BAUD (*((uint32_t*)(UART_BASE + 0x524)))
unsigned int LED = 17;
unsigned int TEST_LED = 18;
int i;
void uart_init();
void led_blink();
void tx_byte();
void test_led();
int main()
{
while(1)
{
test_led();
tx_byte();
}
return 0;
}
void tx_byte()
{
TXD_BUFF = 'A';
led_blink();
for(i=0;i<1000000;i++);
TXD_BUFF = 'B';
led_blink();
for(i=0;i<1000000;i++);
}
void uart_init()
{
UART_ENABLE = 0x08; //enable UART
PSEL_RTS = 0X7FBFFFFF; //pin 22 RTS
PSEL_TXD = 0x7F7FFFFF; //PIN 23 TXD
PSEL_CTS = 0x7DFFFFFF; //Pin 24 CTS
PSEL_RXD = 0x7BFFFFFF; //pin 25 RXD
UART_BAUD = 0x01D60000; //baud 115200
}
void led_blink()
{
GPIO_OUTCLR = (1 << LED);
for(i =0;i<1000000;i++);
GPIO_OUTSET = (1 << LED);
for(i=0;i<1000000;i++);
}
void test_led()
{
GPIO_OUTCLR = (1<< TEST_LED);
for(i = 0;i<1000000;i++);
GPIO_OUTSET = (1<< TEST_LED);
for(i=0;i<1000000;i++);
}
I tried to implement LED blink function but that also didn,t work.Please help me to resolve this.
make file used to compile
PREFIX := arm-none-eabi-
CFLAGS += -mcpu=cortex-m4 -mthumb -g3 -o0
LDFLAGS += ${CFLAGS} -nostartfiles -nodefaultlibs -Wl,-Tlinker.ld
all: build.elf build.hex
main.o: main.c
${PREFIX}gcc ${CFLAGS} -c main.c -o main.o
build.elf: main.o linker.ld
${PREFIX}gcc ${LDFLAGS} main.o -o build.elf
build.hex: build.elf
${PREFIX}objcopy -O ihex build.elf build.hex
flash:
nrfjprog -f nrf52 --program build.hex --sectorerase
nrfjprog --reset
.PHONY: clean
clean:
rm build.elf *.o
