initial
This commit is contained in:
commit
275107cf3b
5
.gitignore
vendored
Normal file
5
.gitignore
vendored
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*.o
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firmware.txt
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firmware.elf
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firmware.map
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35
Makefile
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35
Makefile
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TOOLCHAIN_PREFIX=/opt/msp430-gcc
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CC=$(TOOLCHAIN_PREFIX)/bin/msp430-elf-gcc
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OBJDUMP=$(TOOLCHAIN_PREFIX)/bin/msp430-elf-objdump
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ARTIFACT=firmware
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MCU=msp430g2553
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DEBUGFLAGS=
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# DEBUGFLAGS+= -g3 -ggdb -gdwarf-2
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COMMONFLAGS=-Wall -mmcu=$(MCU) -I $(TOOLCHAIN_PREFIX)/include -O0 -g0 $(DEBUGFLAGS)
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CFLAGS=$(COMMONFLAGS) -std=gnu99
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ASFLAGS=$(COMMONFLAGS) -D__ASSEMBLER__
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LDFLAGS=-mmcu=$(MCU) -L $(TOOLCHAIN_PREFIX)/include
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$(ARTIFACT).elf: main.o scheduler.o
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$(CC) -o $@ $(LDFLAGS) $^
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$(OBJDUMP) -D $(ARTIFACT).elf > $(ARTIFACT).txt
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.c.o:
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$(CC) $(CFLAGS) -c $<
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.S.o:
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$(CC) $(ASFLAGS) -c $<
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.PHONY: all
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all: $(ARTIFACT).elf
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.PHONY: clean
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clean:
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-rm -f *.o $(ARTIFACT).elf $(ARTIFACT).txt
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.PHONY: upload
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upload: $(ARTIFACT).elf
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mspdebug rf2500 "prog $(ARTIFACT).elf"
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28
main.c
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28
main.c
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#include <msp430g2553.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "scheduler.h"
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int main() {
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WDTCTL = WDTPW | WDTHOLD;
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__disable_interrupt();
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// highest possible system clock
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DCOCTL = DCO0 | DCO1 | DCO2;
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BCSCTL1 = XT2OFF | RSEL0 | RSEL1 | RSEL2 | RSEL3;
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BCSCTL2 = 0;
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BCSCTL3 = 0;
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schInit();
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__enable_interrupt();
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while (1) {
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schExec();
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}
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}
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105
scheduler.c
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105
scheduler.c
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#include <stdlib.h>
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#include <msp430g2553.h>
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#include "scheduler.h"
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tTask tasks[MAX_NUM_OF_TASKS];
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uint32_t seconds;
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void schInit() {
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TACCR0 = 19600;
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TACCTL0 = CCIE;
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TACTL = MC_1 | ID_0 | TASSEL_2 | TACLR;
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for (uint16_t i = 0; i < MAX_NUM_OF_TASKS; i++) {
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tasks[i].delay = 0;
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tasks[i].period = 0;
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tasks[i].run = 0;
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tasks[i].exec = NULL;
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tasks[i].handle = NULL;
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}
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seconds = 0;
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// LED
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P1DIR |= BIT0;
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P1OUT &= ~BIT0;
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}
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void __attribute__ ((interrupt (TIMER0_A0_VECTOR))) schUpdate() {
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static uint16_t milliSeconds = 0;
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if (milliSeconds >= 1000) {
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seconds += 1;
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milliSeconds = 0;
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P1OUT ^= BIT0;
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}
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milliSeconds += 1;
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for (uint16_t i = 0; i < MAX_NUM_OF_TASKS; i++) {
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if (tasks[i].exec != NULL) {
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if (tasks[i].delay == 0) {
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tasks[i].delay = tasks[i].period;
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tasks[i].run++;
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} else {
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tasks[i].delay--;
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}
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}
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}
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}
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uint16_t schAdd(void (*exec)(void *), void *handle, uint32_t delay, uint32_t period) {
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uint16_t taskId = 0xffff;
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for (uint16_t i = 0; i < MAX_NUM_OF_TASKS; i++) {
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if (tasks[i].exec == NULL) {
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tasks[i].delay = delay;
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tasks[i].period = period;
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if (delay == 0 && period == 0) {
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tasks[i].run = 1;
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} else {
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tasks[i].run = 0;
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}
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tasks[i].exec = exec;
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tasks[i].handle = handle;
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taskId = i;
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break;
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}
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}
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return taskId;
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}
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void schDel(uint16_t taskId) {
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tasks[taskId].exec = NULL;
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}
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void schExec() {
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for (uint16_t i = 0; i < MAX_NUM_OF_TASKS; i++) {
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// synchronize access to tasks[].run
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__disable_interrupt();
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if (tasks[i].exec != NULL && tasks[i].run > 0) {
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tasks[i].run--;
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// synchronize access to tasks[].run
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// reenable interrupts before actually executing task
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__enable_interrupt();
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tasks[i].exec(tasks[i].handle);
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if (tasks[i].period == 0) {
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tasks[i].exec = NULL;
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}
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} else {
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// synchronize access to tasks[].run
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// reenable interrupts in case task is not yet executable
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__enable_interrupt();
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}
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}
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}
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uint32_t getSeconds() {
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uint32_t s;
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__disable_interrupt();
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s = seconds;
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__enable_interrupt();
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return s;
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}
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28
scheduler.h
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28
scheduler.h
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#ifndef PONTCOOPSCHEDULER_H_
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#define PONTCOOPSCHEDULER_H_
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#include <stdint.h>
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#define MAX_NUM_OF_TASKS 4
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typedef struct {
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uint16_t delay;
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uint16_t period;
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uint8_t run;
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void (*exec)(void *handle);
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void *handle;
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} tTask;
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void schInit();
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uint16_t schAdd(void (*exec)(void *), void *handle, uint32_t delay, uint32_t period);
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// void schDel(void (*exec)(void *), void *handle);
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void schDel(uint16_t taskId);
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void schExec();
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#endif /* PONTCOOPSCHEDULER_H_ */
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