.

README.md

@@ -28,7 +28,7 @@ Connect the Pico USB to the computer, and then open a serial terminal to the USB
   - `set uart.mode [MMM]` (default: 8N1)
   - `set uart.hflow [on | off]` (default: off)
   - `set uart.output [ascii | dec | bin | hex]` (default: ascii)
-  - `guess uart`: tries to autodetect baudrate
+  - `use uart guess`: tries to autodetect baudrate
 - SPI
   - `set spi.cpol [0 | 1]` (default: 0)
   - `set spi.cpha [0 | 1]` (default: 0)
@@ -39,6 +39,7 @@ Connect the Pico USB to the computer, and then open a serial terminal to the USB
 - I2C
   - `set i2c.baud [NNNN]` (baud rate in Hz, master only, default: 100000)
   - `set i2c.output [ascii | dec | bin | hex]` (default: hex)
+  - `use i2c scan`: scan for connected slave addresses
 - PWM
   - `set pwm.freq [NNNN]` (frequency in Hz, default: 100000)
   - `set pwm.duty [NN]` (% duty cycle, default: 50)

firmware/src/command.c

@@ -41,7 +41,10 @@ void execute(uint8_t n_tokens, char tokens[MAX_TOKENS][MAX_TOKEN_SZ])
             printf("Options: uart, spi_master, spi_slave, spi_sniff, i2c_master, i2c_slave, pmw\n");
         } else if (n_tokens >= 2) {
             if (strcmp(tokens[1], "uart") == 0) {
-                uart_init_();
+                if (n_tokens == 3 && strcmp(tokens[2], "guess") == 0)
+                    uart_guess_speed();
+                else
+                    uart_init_();
             } else if (strcmp(tokens[1], "spi_master") == 0) {
                 spi_master_init();
             } else if (strcmp(tokens[1], "spi_slave") == 0) {
@@ -89,13 +92,6 @@ void execute(uint8_t n_tokens, char tokens[MAX_TOKENS][MAX_TOKEN_SZ])
             variable_set(tokens[1], tokens[2]);
         else
             syntax_error();
-    } else if (strcmp(tokens[0], "guess") == 0) {
-        if (n_tokens == 1)
-            printf("Options: uart\n");
-        else if (n_tokens == 2 && strcmp(tokens[0], "uart") == 0)
-            uart_guess_speed();
-        else
-            syntax_error();
     } else {
         syntax_error();
     }

firmware/src/main.c

@@ -19,10 +19,12 @@ int main()
     gpio_set_dir(LED_PIN, GPIO_OUT);
     gpio_put(LED_PIN, 1);
 
+    printf("Press any key to start...");
     getchar();
+    printf("\n");
 
     printf("Welcome to Poor Man Bus Pirate!\n");
-    printf("Available commands: set, reset, use, guess\n");
+    printf("Available commands: set, reset, use\n");
 
     output_init();
     variables_load();

firmware/src/uart.c

@@ -109,7 +109,7 @@ void uart_guess_speed()
 
     static const size_t speeds[] = {
             3000000, 2000000, 1000000, 500000, 250000, 230400, 115200,
-            57600, 38400, 19200, 14400, 9600, 4800, 2400, 1200, 600, 300
+            57600, 38400, 19200, 14400, 9600, 4800, 2400, 1200, 600, 300, 0
     };
 
     for (size_t i = 0; speeds[i]; ++i) {