int timer_set_square(unsigned long timer, unsigned long freq) {
char buf[12];
sprintf(buf, "TIMER_SEL", timer);
unsigned long div = (TIMER_FREQ / freq);
unsigned long LSB = div;
unsigned long MSB = (div >> 8);
unsigned char conf, port;
if (freq < 19){
printf("Error: Frequency must be greater than 18 Hz.\n");
printf("OVERFLOW -> (Clock signal frequency)/freq must have a maximum of 16 bits.\n");
return EXIT_FAILURE;
}
else if (TIMER_FREQ < freq){
printf("Error: Frequency must be less than 1193182 Hz (clock signal frequency).\n");
return EXIT_FAILURE;
}
int i = timer_get_conf(timer, &conf);
if (i != 0)
return EXIT_FAILURE;
port = (TIMER_0 + timer);
unsigned char counting_mode;
if (conf == 0)
counting_mode = TIMER_BIN;
else if (conf == 1)
counting_mode = TIMER_BCD;
if (sys_outb(TIMER_CTRL, (int) buf | TIMER_LSB_MSB | TIMER_SQR_WAVE | counting_mode ) != OK
|| sys_outb(port, LSB) != OK
|| sys_outb(port, MSB) != OK)
return EXIT_FAILURE;
else
return EXIT_SUCCESS;
}
int timer_test_config(unsigned long timer) {
unsigned char conf;
timer_get_conf(timer, &conf);
timer_display_conf(conf);
if (conf = 0xB6)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
int timer_test_config(unsigned long timer) {
unsigned long *st;
if ((st = malloc(sizeof(unsigned char))) != NULL)
{
if (timer_get_conf(timer, st))
{
free(st);
return 1;
}
return timer_display_conf((unsigned char)*st);
}
free(st);
return 1;
}
int timer_set_square(unsigned long timer, unsigned long freq) {
unsigned long tempByte;
unsigned char st;
if (timer == 0)
{
timer_get_conf(timer, &st);
st = 0x0F & st; //st fica com os ultimos 4 bits
tempByte = (TIMER_SEL0 | TIMER_LSB_MSB | st); // seleciona o TIMER_0 e ativa LSB followed by MSB
sys_outb(TIMER_CTRL, tempByte);
sys_outb(TIMER_0, TIMER_FREQ/freq); //manda LSB
sys_outb(TIMER_0, (TIMER_FREQ/freq >> 8)); //manda MSB
return 0;
}
int timer_set_square(unsigned long timer, unsigned long freq) {
unsigned long lsb;
unsigned char msb;
unsigned long fr;
unsigned char st;
//verifica se o resultado da frequencia é menor que o valor maximo possivel de representar em 2 bytes.
if(TIMER_FREQ/freq >= 0xFFFF)
{
printf("Frequencia nao suportavel pelo timer (overflow).\n");
return 1;
}
fr = TIMER_FREQ / freq;
if (timer == 0 || timer == 1 || timer == 2)
{
timer_get_conf(timer, &st);
st=st<<4;
st=st>>4;
st=(TIMER_0 + timer | TIMER_LSB_MSB | st); //controlador criado mantendo o counting mode e operation
if (sys_outb(TIMER_CTRL, st)) {
printf("Error by calling sys_outb for confs\n");
return 1;
}
lsb = (char)fr; //isola o primeiro byte da frequencia
fr = fr>>8;
msb = (char)fr; //isola o segundo byte da frequencia
if (sys_outb(TIMER_0 + timer, lsb)) //envia o LSB para o timer
{
printf("Error by calling sys_outb for lsb.\n");
return 1;
}
else if (sys_outb(TIMER_0 + timer, msb)) //envia o MSB para o timer
{
printf("Error by calling sys_outb for msb.\n");
return 1;
}
else {
return 0;
}
} else
int timer_test_config(unsigned long timer)
{
unsigned char tempo;
int erro;
if(timer<0 || timer >2)
{
return 1;
}
erro = timer_get_conf(timer,&tempo);
if(erro == 1)
return 1;
erro = timer_display_conf(tempo);
if(erro == 1)
return 1;
return 0;
}
int timer_set_square(unsigned long timer, unsigned long freq)
{
unsigned long div = TIMER_FREQ/freq;
char conf;
if(freq == 0 || freq > TIMER_FREQ || div >= (1 << 16))
{
return 1;
}
if(timer >= 0 && timer <= 2)
{
if(timer_get_conf(timer,&conf)!= 0)
{
return 1;
}
if(sys_outb(TIMER_CTRL,TIMER_SEL0 | TIMER_LSB_MSB | TIMER_SQR_WAVE | (conf & BIT(0))) != 0)
{
return 1;
}
if(sys_outb(TIMER_0+timer, (char)div) != 0)
{
return 1;
}
if(sys_outb(TIMER_0+timer,(char)(div>>8)) != 0)
{
return 1;
}
return 0;
}
return 1;
}
