Update example a bit

Reduce the output. Come up with a more realistic example monitoring
the memory usage of another device. Add USB logging.
Now matches ina260 SPI example.

Author: peterharperuk

i2c/ina228_i2c/CMakeLists.txt

@@ -2,12 +2,19 @@ add_executable(ina228_i2c ina228_i2c.c)
 
 # pull in common dependencies and additional i2c hardware support
 target_link_libraries(ina228_i2c
-        pico_stdlib
-        hardware_i2c)
+    pico_stdlib
+    hardware_i2c
+)
+# Wait at most 3s for stdio_usb to be ready
+target_compile_definitions(ina228_i2c PRIVATE
+   PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS=3000
+)
 
 # create map/bin/hex file etc.
 pico_add_extra_outputs(ina228_i2c)
 
 # add url via pico_set_program_url
 example_auto_set_url(ina228_i2c)
 
+pico_enable_stdio_usb(ina228_i2c 1)
+pico_enable_stdio_uart(ina228_i2c 1)

i2c/ina228_i2c/ina228_i2c.c

@@ -3,9 +3,6 @@
 #include "hardware/i2c.h"
 #include <math.h>
 
-// LED GPIO
-#define EXT_LED_GPIO 2
-
 // INA228 breakout board shunt resistance in Ohms
 #define R_SHUNT 0.015
 
@@ -100,11 +97,6 @@ int main()
 {
     stdio_init_all();
 
-    // Initialise external LED and turn it on (so we can measure some current)
-    gpio_init(EXT_LED_GPIO);
-    gpio_set_dir(EXT_LED_GPIO, GPIO_OUT);
-    gpio_put(EXT_LED_GPIO, true);
-
     // I2C initialisation
     i2c_init(i2c_default, 400*1000);
 
@@ -119,7 +111,11 @@ int main()
 
     while (true) {
         ina228_read(&vshunt, &vbus, &dietemp, &current, &power, &energy, &charge);
+#if 0
         printf("INA228 Measurements:\nVSHUNT: %f V\nVBUS: %f V\nDIETEMP: %f °C\nCURRENT: %f A\nPOWER: %f W\nENERGY: %f J\nCHARGE: %f C\n-----------------\n", vshunt, vbus, dietemp, current, power, energy, charge);
+#else
+        printf("current: %.2f mA voltage: %.2f V power: %.2f mW\n", current * 1000, vbus, power * 1000);
+#endif
         sleep_ms(1000);
     }
 }