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send_packet.c
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#define PULSE_WIDTH 250000
void count_down(const int d)
{
/* Configure timer for a single-shot countdown */
reg_timer0_config = 0;
reg_timer0_data = d;
reg_timer0_config = 1; /* Enabled, one-shot, down count */
// Loop, waiting for value to reach zero
reg_timer0_update = 1; // latch current value
while (reg_timer0_value > 0) {
reg_timer0_update = 1;
}
}
//void send_pulse_io0(){
// int mask = 0xFFFFFFFE;
// int temp = reg_mprj_datal&mask;
// reg_mprj_datal = temp; // 0
// count_down(PULSE_WIDTH);
// temp = reg_mprj_datal;
// reg_mprj_datal = temp | 1; // 1
// count_down(PULSE_WIDTH);
//}
void send_pulse_io37(){
int mask = 0x1F;
int temp = reg_mprj_datah&mask;
reg_mprj_datah = temp; // 0
count_down(PULSE_WIDTH);
temp = reg_mprj_datah;
reg_mprj_datah = temp | 0x20; // 1
count_down(PULSE_WIDTH);
}
//void send_packet_io0(int num_pulses){
// // send pulses
// for (int i = 0; i < num_pulses+1; i++){
// send_pulse_io0();
// }
// // end of packet
// count_down(PULSE_WIDTH*10);
//}
void send_packet_io37(int num_pulses){
// send pulses
for (int i = 0; i < num_pulses+1; i++){
send_pulse_io37();
}
// end of packet
count_down(PULSE_WIDTH*10);
}
//void configure_io0_37(){
// reg_mprj_xfer = 0x66; reg_mprj_xfer = 0x76; // 11
//reg_mprj_xfer = 0x06; reg_mprj_xfer = 0x16;
//
// for (int count = 0; count < 7; count++) {
// reg_mprj_xfer = 0x06; reg_mprj_xfer = 0x16; // 00
// }
//
// reg_mprj_xfer = 0x66; reg_mprj_xfer = 0x76; // 11
// reg_mprj_xfer = 0x06; reg_mprj_xfer = 0x16; // 00
// reg_mprj_xfer = 0x06; reg_mprj_xfer = 0x16; // 00
// reg_mprj_xfer = 0x66; reg_mprj_xfer = 0x76; // 11
// // load
// reg_mprj_xfer = 0x06;
// reg_mprj_xfer = 0x0e;
// reg_mprj_xfer = 0x06; // Apply load
//}
//int receive_io37(){
// int mask = 0x1 << 5;
// int old_received;
// int received;
// int pulse = 0;
// int timeout_count = 0;
// int timeout = 5000;
// /*
// flag == 1 --> increment
// flag == 2 --> reset
// */
// int flag = 0;
// old_received = reg_mprj_datah & mask;
// send_packet_io0(2);
// while(1){
// received = reg_mprj_datah & mask;
// if (received != old_received){
// pulse++;
// old_received = received;
// }
// // else{
// // timeout_count++;
// // }
// if (pulse == 8){
// flag = 1;
// return flag;
// }
// // if (timeout_count > timeout){
// // if (pulse == 4){
// // flag = 2;
// // return flag;
// // }
// // else{
// // return 0;
// // }
// // }
// }
//}
int receive_io0(){
// int mask = 0x1 << 5;
int mask = 0x1;
int old_received;
int received;
int pulse = 0;
int timeout_count = 0;
int timeout = 5000;
/*
flag == 1 --> increment
flag == 2 --> reset
*/
int flag = 0;
// old_received = reg_mprj_datah & mask;
old_received = reg_mprj_datal & mask;
// send_packet_io0(2);
send_packet_io37(2);
while(1){
// received = reg_mprj_datah & mask;
received = reg_mprj_datal & mask;
if (received != old_received){
pulse++;
old_received = received;
}
if (pulse == 8){
flag = 1;
return flag;
}
}
}