//------------UART_InCharNonBlock------------
// input ASCII character from UART
// output: 0 if RxFifo is empty
// character if
char UART_InCharNonBlock(void){
char letter;
if(RxFifo_Get(&letter) == FIFOFAIL){
return 0; // empty
};
return(letter);
}
// input ASCII character from UART
// block if RxFifo is empty
char UART_InChar(void){
char letter;
while(RxFifo_Get(&letter) == FIFOFAIL){
OS_Wait(&RxDataAvailable);
}
return(letter);
}
// advance the fifo to the next alphabetic letter
long nextAlpha(void) {
long status = 0;
char ch;
while(RxFifo_Peek(&ch)) {
if(isalpha(ch)) {
status = 1;
break;
}
RxFifo_Get(&ch);
}
return status;
}
// Searchs for a desired string by reading
// through the recieved characters. This will remove
// items from the buffer.
tBoolean WiFly_Match(const char * match) {
char ch;
long idx = 0;
long len = strlen(match);
tBoolean status = true;
while((len != idx) && status) {
status = RxFifo_Get(&ch);
idx = (ch == match[idx]) ? (idx+1) : 0;
}
if(len == idx) status = true;
return status;
}
// get the next key
long getNextString(char* string) {
long status;
char ch;
if(nextAlpha()) {
while(RxFifo_Get(&ch)) {
if(isalpha(ch))
*string++ = ch;
else {
*string = '\0';
status = 1;
break;
}
}
}
return status;
}
// Opens a network connection to the server
tBoolean WiFly_Open(char *resp) {
tBoolean status = false;
char* resp_pt = resp;
RxFifo_Flush(); // Flux the FIFO
status = WiFly_Send(CMD_CMD, CMD_RSP);
if(status){
status = WiFly_Send(OPEN_CMD, NO_RSP);
if(status){
SysCtlDelay(SysCtlClockGet()*3); // Blocking wait
while(RxFifo_Get(resp_pt)) resp_pt++;
*resp_pt = NULL;
}
}
WiFly_Send(EXIT_CMD, EXIT_RSP);
return status;
}
// get the next number
long getNextNum(unsigned long* num) {
long status = 0;
char num_s[11], ch;
size_t i = 0;
if(nextDigit()) {
while(RxFifo_Get(&ch)) {
if(isdigit(ch)) {
num_s[i++] = ch;
}
else {
num_s[i] = '\0';
*num = strtoul(num_s, NULL, 10);
status = 1;
break;
}
}
}
return status;
}
// Gets posix time from NIST servers
// TODO: Use the NIST DNS for reliability
unsigned long WiFly_Time(void){
tBoolean status = false;
unsigned char i = 0;
unsigned long time = 0;
char time_str[11]; // A string formatted long can only be 10 characters
RxFifo_Flush();
status = WiFly_Send(CMD_CMD, CMD_RSP);
if(status) {
status = WiFly_Send(TIME_CMD, TIME_RSP); // Get time
if(status) {
for(i = 0; i < 10; i++) RxFifo_Get(&time_str[i]);
time_str[10] = 0x0;
RIT128x96x4StringDraw(time_str, 0, 0, 15);
time = strtoul(time_str, NULL, 0); // Convert to unsigned long
}
}
WiFly_Send(EXIT_CMD, EXIT_RSP);
return time;
}
// input ASCII character from UART
// spin if RxFifo is empty
char UART_InChar(void){
char letter;
while(RxFifo_Get(&letter) == FIFOFAIL){};
return(letter);
}
int main2(void){ int i;
// *************** Test #1: test transmit (index) FIFO **************
TxFifo_Init();
result = TxFifo_Get(&letter); // letter = ??, result = 0
result = TxFifo_Put('A'); // result = 1
result = TxFifo_Put('B'); // result = 1
result = TxFifo_Put('C'); // result = 1
result = TxFifo_Get(&letter); // letter = 0x41, result = 1
result = TxFifo_Get(&letter); // letter = 0x42, result = 1
result = TxFifo_Put('D'); // result = 1
result = TxFifo_Size(); // result = 2
result = TxFifo_Get(&letter); // letter = 0x43, result = 1
result = TxFifo_Get(&letter); // letter = 0x44, result = 1
result = TxFifo_Size(); // result = 0
result = TxFifo_Get(&letter); // letter = ??, result = 0
for(i='A'; i<'A'+TXFIFOSIZE; i=i+1){
result = TxFifo_Put(i); // result = 1
}
result = TxFifo_Size(); // result = 16
result = TxFifo_Get(&letter); // letter = 0x41, result = 1
result = TxFifo_Size(); // result = 15
result = TxFifo_Get(&letter); // letter = 0x42, result = 1
result = TxFifo_Size(); // result = 14
result = TxFifo_Put(' '); // result = 1
result = TxFifo_Size(); // result = 15
// *************** Test #2: test receive (pointer) FIFO *************
RxFifo_Init();
result = RxFifo_Get(&letter); // letter = ??, result = 0
result = RxFifo_Put('A'); // result = 1
result = RxFifo_Put('B'); // result = 1
result = RxFifo_Put('C'); // result = 1
result = RxFifo_Get(&letter); // letter = 0x41, result = 1
result = RxFifo_Get(&letter); // letter = 0x42, result = 1
result = RxFifo_Put('D'); // result = 1
result = RxFifo_Size(); // result = 2
result = RxFifo_Get(&letter); // letter = 0x43, result = 1
result = RxFifo_Get(&letter); // letter = 0x44, result = 1
result = RxFifo_Size(); // result = 0
result = RxFifo_Get(&letter); // letter = ??, result = 0
for(i='A'; i<'A'+RXFIFOSIZE-1; i=i+1){
result = RxFifo_Put(i); // result = 1
}
result = RxFifo_Size(); // result = 9
result = RxFifo_Get(&letter); // letter = 0x41, result = 1
result = RxFifo_Size(); // result = 8
result = RxFifo_Get(&letter); // letter = 0x42, result = 1
result = RxFifo_Size(); // result = 7
result = RxFifo_Put(' '); // result = 1
result = RxFifo_Size(); // result = 8
// *********** Test #3: test transmit (index) FIFO creator **********
Tx2Fifo_Init();
result = Tx2Fifo_Get(&letter);// letter = ??, result = 0
result = Tx2Fifo_Put('A'); // result = 1
result = Tx2Fifo_Put('B'); // result = 1
result = Tx2Fifo_Put('C'); // result = 1
result = Tx2Fifo_Get(&letter);// letter = 0x41, result = 1
result = Tx2Fifo_Get(&letter);// letter = 0x42, result = 1
result = Tx2Fifo_Put('D'); // result = 1
result = Tx2Fifo_Size(); // result = 2
result = Tx2Fifo_Get(&letter);// letter = 0x43, result = 1
result = Tx2Fifo_Get(&letter);// letter = 0x44, result = 1
result = Tx2Fifo_Size(); // result = 0
result = Tx2Fifo_Get(&letter);// letter = ??, result = 0
for(i='A'; i<'A'+TX2FIFOSIZE; i=i+1){
result = Tx2Fifo_Put(i); // result = 1
}
result = Tx2Fifo_Size(); // result = 32
result = Tx2Fifo_Get(&letter);// letter = 0x41, result = 1
result = Tx2Fifo_Size(); // result = 31
result = Tx2Fifo_Get(&letter);// letter = 0x42, result = 1
result = Tx2Fifo_Size(); // result = 30
result = Tx2Fifo_Put(' '); // result = 1
result = Tx2Fifo_Size(); // result = 31
// *********** Test #4: test receive (pointer) FIFO creator *********
Rx2Fifo_Init();
result = Rx2Fifo_Get(&letter);// letter = ??, result = 0
result = Rx2Fifo_Put('A'); // result = 1
result = Rx2Fifo_Put('B'); // result = 1
result = Rx2Fifo_Put('C'); // result = 1
result = Rx2Fifo_Get(&letter);// letter = 0x41, result = 1
result = Rx2Fifo_Get(&letter);// letter = 0x42, result = 1
result = Rx2Fifo_Put('D'); // result = 1
result = Rx2Fifo_Size(); // result = 2
result = Rx2Fifo_Get(&letter);// letter = 0x43, result = 1
result = Rx2Fifo_Get(&letter);// letter = 0x44, result = 1
result = Rx2Fifo_Size(); // result = 0
result = Rx2Fifo_Get(&letter);// letter = ??, result = 0
for(i='A'; i<'A'+RX2FIFOSIZE-1; i=i+1){
result = Rx2Fifo_Put(i); // result = 1
}
result = Rx2Fifo_Size(); // result = 26
result = Rx2Fifo_Get(&letter);// letter = 0x41, result = 1
result = Rx2Fifo_Size(); // result = 25
result = Rx2Fifo_Get(&letter);// letter = 0x42, result = 1
result = Rx2Fifo_Size(); // result = 24
result = Rx2Fifo_Put(' '); // result = 1
result = Rx2Fifo_Size(); // result = 25
while(1);
}
int main(void){
int i;
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_8MHZ); // 50 MHz
// **** general initialization ****
DisableInterrupts();
SYSCTL_RCGC1_R |= SYSCTL_RCGC1_TIMER0;// activate timer0
SYSCTL_RCGC2_R |= SYSCTL_RCGC2_GPIOF+SYSCTL_RCGC2_GPIOG; // activate ports F and G
BackData = 0; // allow time to finish activating
BackCounter = 0;
EnteredCount = 0;
ForeExpected = 0;
Errors = 0;
EnterGet = 0;
GPIO_PORTF_DIR_R |= 0x0F; // make PF3-PF0 out (connect to scope/logic analyzer)
GPIO_PORTF_DEN_R |= 0x0F; // enable digital I/O on PF3-PF0
GPIO_PORTG_DIR_R |= 0x04; // make PG2 out (PG2 built-in LED)
GPIO_PORTG_DEN_R |= 0x04; // enable digital I/O on PG2
GPIO_PORTG2 = 0x00; // clear PG2
GPIO_PORTF0 = 0x00;
GPIO_PORTF1 = 0x00;
GPIO_PORTF2 = 0x00;
TIMER0_CTL_R &= ~TIMER_CTL_TAEN; // disable timer0A during setup
TIMER0_CFG_R = TIMER_CFG_16_BIT; // configure for 16-bit timer mode
// **** timer0A initialization ****
TIMER0_TAMR_R = TIMER_TAMR_TAMR_PERIOD;// configure for periodic mode
TIMER0_TAILR_R = INTPERIOD - 1; // start value to count down from
TIMER0_IMR_R |= TIMER_IMR_TATOIM;// enable timeout (rollover) interrupt
TIMER0_ICR_R = TIMER_ICR_TATOCINT;// clear timer0A timeout flag
// **** interrupt initialization ****
// Timer0A=priority 2
NVIC_PRI4_R = (NVIC_PRI4_R&0x00FFFFFF)|0x40000000; // top 3 bits
NVIC_EN0_R |= NVIC_EN0_INT19; // enable interrupt 19 in NVIC
// *************** Test #5: test interrupt vulnerability ************
RxFifo_Init();
for(i=0; i<HISTOGRAMSIZE; i=i+1){ unsigned long returnaddress;
LineHistogram[i] = 0;
returnaddress = ((unsigned long)&RxFifo_Get + 2*i)&0xFFFFFFFE;
LineHistogramAddress[i] = returnaddress; // possible places in Get that could be interrupted
}
TIMER0_ICR_R = TIMER_ICR_TATOCINT;// clear timer0A timeout flag
TIMER0_CTL_R |= TIMER_CTL_TAEN; // enable timer0A 16-b, periodic, interrupts
EnableInterrupts();
while(1){
do{
GPIO_PORTF0 = 1; // profile of main program
EnterGet = 1;
i = RxFifo_Get(&ForeActual); // i = 0 (FIFOFAIL) if error
EnterGet = 0;
GPIO_PORTF0 = 0;
}
while(!i);
GPIO_PORTF1 = 2; // profile of main program
if(ForeExpected != ForeActual){
Errors = Errors + 1; // critical section found
ForeExpected = ForeActual + 1; // resych to lost/bad data
GPIO_PORTG2 = 0x04; // set PG2, means error
}
else{
ForeExpected = ForeExpected + 1;// sequence is 0,1,2,3,...,254,255,0,1,...
}
GPIO_PORTF1 = 0;
}
}
//-------------------------SCI_InChar------------------------
// Wait for new serial port input, interrupt synchronization
// The input is not echoed
// Input: SCI port
// Output: ASCII code for key typed
char SCI_InChar(unsigned char port){
char letter;
while (RxFifo_Get(port, &letter) == 0){};
return(letter);
}
