OpenCores
URL https://opencores.org/ocsvn/neorv32/neorv32/trunk

Subversion Repositories neorv32

Compare Revisions

  • This comparison shows the changes necessary to convert path 
    /neorv32/trunk/sw/example/demo_twi
    from Rev 64 to Rev 65
    ↔ Reverse comparison
  •

Rev 64 → Rev 65

/main.c
73,7 → 73,7
int bus_claimed = 0;
 
// check if UART unit is implemented at all
if (neorv32_uart_available() == 0) {
if (neorv32_uart0_available() == 0) {
return 1;
}
 
84,24 → 84,24
 
 
// init UART at default baud rate, no parity bits, ho hw flow control
neorv32_uart_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
 
// check available hardware extensions and compare with compiler flags
neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
 
// intro
neorv32_uart_printf("\n--- TWI Bus Explorer ---\n\n");
neorv32_uart0_printf("\n--- TWI Bus Explorer ---\n\n");
 
 
// check if TWI unit is implemented at all
if (neorv32_twi_available() == 0) {
neorv32_uart_printf("No TWI unit implemented.");
neorv32_uart0_printf("No TWI unit implemented.");
return 1;
}
 
 
// info
neorv32_uart_printf("This program allows to create TWI transfers by hand.\n"
neorv32_uart0_printf("This program allows to create TWI transfers by hand.\n"
"Type 'help' to see the help menu.\n\n");
 
// configure TWI, second slowest clock, no clock-stretching
112,9 → 112,9
 
// Main menu
for (;;) {
neorv32_uart_printf("TWI_EXPLORER:> ");
length = neorv32_uart_scan(buffer, 8, 1);
neorv32_uart_printf("\n");
neorv32_uart0_printf("TWI_EXPLORER:> ");
length = neorv32_uart0_scan(buffer, 8, 1);
neorv32_uart0_printf("\n");
 
if (!length) // nothing to be done
continue;
121,7 → 121,7
 
// decode input and execute command
if (!strcmp(buffer, "help")) {
neorv32_uart_printf("Available commands:\n"
neorv32_uart0_printf("Available commands:\n"
" help - show this text\n"
" scan - scan bus for devices\n"
" start - generate START condition\n"
138,7 → 138,7
}
else if (!strcmp(buffer, "stop")) {
if (bus_claimed == 0) {
neorv32_uart_printf("No active I2C transmission.\n");
neorv32_uart0_printf("No active I2C transmission.\n");
continue;
}
neorv32_twi_generate_stop(); // generate STOP condition
152,7 → 152,7
}
else if (!strcmp(buffer, "send")) {
if (bus_claimed == 0) {
neorv32_uart_printf("No active I2C transmission. Generate a START condition first.\n");
neorv32_uart0_printf("No active I2C transmission. Generate a START condition first.\n");
continue;
}
else {
160,7 → 160,7
}
}
else {
neorv32_uart_printf("Invalid command. Type 'help' to see all commands.\n");
neorv32_uart0_printf("Invalid command. Type 'help' to see all commands.\n");
}
}
 
175,17 → 175,17
 
char terminal_buffer[2];
 
neorv32_uart_printf("Select new clock prescaler (0..7): ");
neorv32_uart_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
neorv32_uart0_printf("Select new clock prescaler (0..7): ");
neorv32_uart0_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
uint8_t prsc = (uint8_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
 
if ((prsc >= 0) && (prsc < 8)) { // valid?
NEORV32_TWI.CTRL = 0; // reset
NEORV32_TWI.CTRL = (1 << TWI_CTRL_EN) | (prsc << TWI_CTRL_PRSC0);
neorv32_uart_printf("\nDone.\n");
neorv32_uart0_printf("\nDone.\n");
}
else {
neorv32_uart_printf("\nInvalid selection!\n");
neorv32_uart0_printf("\nInvalid selection!\n");
return;
}
 
203,7 → 203,7
default: div = 0; break;
}
uint32_t clock = NEORV32_SYSINFO.CLK / div;
neorv32_uart_printf("New I2C clock: %u Hz\n", clock);
neorv32_uart0_printf("New I2C clock: %u Hz\n", clock);
}
 
 
212,7 → 212,7
**************************************************************************/
void scan_twi(void) {
 
neorv32_uart_printf("Scanning TWI bus...\n");
neorv32_uart0_printf("Scanning TWI bus...\n");
uint8_t i, num_devices = 0;
for (i=0; i<128; i++) {
uint8_t twi_ack = neorv32_twi_start_trans((uint8_t)(2*i+1));
219,13 → 219,13
neorv32_twi_generate_stop();
 
if (twi_ack == 0) {
neorv32_uart_printf("+ Found device at write-address 0x%x\n", (uint32_t)(2*i));
neorv32_uart0_printf("+ Found device at write-address 0x%x\n", (uint32_t)(2*i));
num_devices++;
}
}
 
if (!num_devices) {
neorv32_uart_printf("No devices found.\n");
neorv32_uart0_printf("No devices found.\n");
}
}
 
238,16 → 238,16
char terminal_buffer[4];
 
// enter data
neorv32_uart_printf("Enter TX data (2 hex chars): ");
neorv32_uart_scan(terminal_buffer, 3, 1); // 2 hex chars for address plus '\0'
neorv32_uart0_printf("Enter TX data (2 hex chars): ");
neorv32_uart0_scan(terminal_buffer, 3, 1); // 2 hex chars for address plus '\0'
uint8_t tmp = (uint8_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
uint8_t res = neorv32_twi_trans(tmp);
neorv32_uart_printf("\nRX data: 0x%x\n", (uint32_t)neorv32_twi_get_data());
neorv32_uart_printf("Response: ");
neorv32_uart0_printf("\nRX data: 0x%x\n", (uint32_t)neorv32_twi_get_data());
neorv32_uart0_printf("Response: ");
if (res == 0)
neorv32_uart_printf("ACK\n");
neorv32_uart0_printf("ACK\n");
else
neorv32_uart_printf("NACK\n");
neorv32_uart0_printf("NACK\n");
 
}
 

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