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serial support

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This commit is contained in:
Clyne Sullivan 2018-01-06 19:47:40 -05:00
parent 67243b6d98
commit a93e506b78
5 changed files with 54 additions and 8 deletions
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2
Makefile
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@ -17,7 +17,7 @@ OFILES = $(patsubst src/%.c, $(OUTDIR)/%.o, $(CFILES)) \
$(patsubst src/%.s, $(OUTDIR)/%.asm.o, $(AFILES))
LIBDIR = -Llib
LIBS = -llua
LIBS =
HEX = main.hex

8
include/serial.h Normal file
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@ -0,0 +1,8 @@
#ifndef SERIAL_H_
#define SERIAL_H_
void serial_init(void);
void serial_put(int c);
char serial_get(void);
#endif // SERIAL_H_

BIN
lib/liblua.a
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Binary file not shown.

25
src/main.c
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@ -5,6 +5,7 @@
#include <gpio.h>
#include <lcd.h>
#include <initrd.h>
#include <serial.h>
/**
* Accomplishments:
@ -15,7 +16,8 @@
* - gpio lib
* - lcd support
* - initrd support
* - lua?
* - lua? - no, something better, smaller
* - serial IO
*/
void pulse(uint8_t byte);
@ -35,12 +37,14 @@ int main(void)
gpio_mode(GPIOA, 5, OUTPUT);
serial_init();
task_init(kmain);
while (1);
}
void task(void);
void serial_getter(void);
void kmain(void)
{
asm("cpsie i");
@ -48,12 +52,11 @@ void kmain(void)
task_start(lcd_handler, 128);
delay(200);
char *s = initrd_getfile("test.txt");
const char *t = "Yoyoyo";
asm("mov r0, %0; svc 2" :: "r" (s));
asm("mov r0, %0; svc 2" :: "r" (t));
//char *s = initrd_getfile("test.txt");
// svc puts
//asm("mov r0, %0; svc 2" :: "r" (s));
task_start(serial_getter, 128);
while (1) {
gpio_dout(GPIOA, 5, 1);
delay(500);
@ -62,3 +65,11 @@ void kmain(void)
}
}
void serial_getter(void)
{
char buf[2] = { 0, 0 };
while (1) {
buf[0] = serial_get();
asm("mov r0, %0; svc 2" :: "r" (buf));
}
}

27
src/serial.c Normal file
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@ -0,0 +1,27 @@
#include <stm32l476xx.h>
#include <gpio.h>
void serial_init(void)
{
gpio_mode(GPIOA, 2, ALTERNATE);
gpio_mode(GPIOA, 3, ALTERNATE);
GPIOA->AFR[0] &= ~(0x0000FF00);
GPIOA->AFR[0] |= 0x00007700;
RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;
// start usart device
USART2->BRR = 80000000L / 115200L;
USART2->CR1 |= USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
}
void serial_put(int c)
{
while (!(USART2->ISR & USART_ISR_TXE));
USART2->TDR = c & 0xFF;
}
char serial_get(void)
{
while (!(USART2->ISR & USART_ISR_RXNE));
return USART2->RDR & 0xFF;
}