/********************************************************************************
* This program demonstrates use of the JTAG UART port in the DE2 Media Computer
*
* It performs the following:
* 1. sends a text string to the JTAG UART
* 2. reads character data from the JTAG UART
* 3. echos the character data back to the JTAG UART
********************************************************************************/
int main(void)
{
/* Declare volatile pointers to I/O registers (volatile means that IO load
and store instructions will be used to access these pointer locations,
instead of regular memory loads and stores) */
volatile int * JTAG_UART_ptr = (int *) 0x10001000; // JTAG UART address
int data, i;
char text_string[] = "\nJTAG UART example code\n> \0";
/* print a text string */
for (i = 0; text_string[i] != 0; ++i)
put_jtag (JTAG_UART_ptr, text_string[i]);
/* read and echo characters */
while(1)
{
data = *(JTAG_UART_ptr); // read the JTAG_UART data register
if (data & 0x00008000) // check RVALID to see if there is new data
{
data = data & 0x000000FF; // the data is in the least significant byte
/* echo the character */
put_jtag (JTAG_UART_ptr, (char) data & 0xFF );
}
}
}
int main(void)
{
/* Declare volatile pointers to I/O registers (volatile means that IO load
and store instructions will be used to access these pointer locations,
instead of regular memory loads and stores) */
volatile int * JTAG_UART_ptr = (int *) 0x10001000; // JTAG UART address
char select_line = 0x0;
volatile float tempFloat; //strtod returns a double
uint32_t dataLine;
int data, i, n;
int k1, k2, k13, kmid, x1, v1, x2, v2;
char command_index = 0;
char text_string[] = "\nInput Coordinate and Zoom Parameters\n> \0";
char * command_string;//[20];
char xCoord_string[] = "xC:";
char yCoord_string[] = "yC:";
char zoom_string[] = "zm:";
char* pEnd;
command_string = malloc( sizeof(char)*20);
/* print a text string */
for (i = 0; text_string[i] != 0; ++i)
put_jtag (JTAG_UART_ptr, text_string[i]);
/* read and echo characters */
while(1)
{
data = *(JTAG_UART_ptr); // read the JTAG_UART data register
if (data & 0x00008000) // check RVALID to see if there is new data
{
data = data & 0x000000FF; // the data is in the least significant byte
/* echo the character */
// Add the data to the current command string if not return
if ((data != '\n') && (data != '\r') && (command_index <19))
{
command_string[command_index] = data;
command_index++;
}
// clear the command string if there is a return
else
{
command_string[command_index] = '\0';
// check for a match on any of the special strings in the command string
if (strstr(command_string,xCoord_string) == command_string)
{
//printf("\nfound k1 match\n");
tempFloat = atof(&command_string[3]); //strtod(&command_string[3],&pEnd);
//printf("completed strtod call\n");
//sscanf(command_string,"%f", &tempFloat);
select_line = 0x1;
}
else if (strstr(command_string,yCoord_string) == command_string)
{
tempFloat = strtod(command_string + 3,NULL);
select_line = 0x2;
}
else if (strstr(command_string,zoom_string) == command_string)
{
tempFloat = strtod(command_string + 3,NULL);
select_line = 0x3;
}
else
{
//select_line = 0x0;
}
//printf("about to convert to fixed\n");
dataLine = FLOAT2_DDA_FIXED(tempFloat);
// after reading a value, zero the index and clear the command string
//printf("tempFloat = %f\ndataLine = ",tempFloat);
*(dda_ptr)= (dataLine << 4) | select_line;
command_index = 0;
//printf("converted to fixed and sent to ports\ndataLine = ");
// print out the value sent to ports on JTAG
/*
for (n=17;n>=0;n--){
if (dataLine & (1<<n))
{
printf("1");
}
else
{
printf("0");
}
if (n==16) {printf("_");}
if (n==12) {printf(" ");}
if (n==8) {printf(" ");}
if (n==4) {printf(" ");}
}
*/
//printf("\nPort output displayed above\n");
// zero the command string
for (n=0;n<20;n++){
command_string[n] = '\0';
}
}
put_jtag (JTAG_UART_ptr, (char) data & 0xFF );
}
}
}
