1) To view which port pin you are required to physically monitor with your probe, always review the most LEFT column. For your P1A0, this is physical port X0D00. Then review the datasheet of the CPU to locate this definition for the TQFP128 CPU package. This results in physical pin # 30. However, this pin is only bonded out to a test point # TP30. At this time, no idea on where this is on the PCB layout but you could review the PCB gerbers to locate TP30. Suspecting it is very close to Pin 30 on the CPU itself.
This is option # 1.
So you can attempt to probe on TP30 (Test Point 30 on the kit - wherever that is). You could download the PCB gerbers for the kit -> review in a PCB gerber viewer tool and highlight TP30 and/or X0D0 Pin 30 on the CPU to locate this pad.
2) Option # 2 is a wiser choice and that is to move this pin inside the source code to one that is a SINGLE BIT port pin AND also is available on J1 connector that you are already probing.
Why a SINGLE BIT port pin you may ask? This is because the port pin is a clock OUTPUT. On XMOS CPUs you MUST use a single bit port pin when the pin is used for a clock output.
So the approach here is to:
a) review your CPU datasheet and locate other single bit ports. This is any port with a label of "P1" prefix. Then see if that port pin is available on the kit as a "free" port for your use without conflict with other hardware on this same kit.
b) In following the above scan,
P1B0? No cannot use since this is X0D01 and the kit schematic states this is being used as SPI Flash CS port pin. While you could use this but as you toggle this pin, the FLASH will ENABLE / DISABLE with each toggle. Skip this port pin.
P1C0? No ->X0D10 is mapped to SPI Flash CLK port pin.
P1D0? This is X0D11. Appears to be free but a pain to locate TP27. Is not available on J1 for our simple probing.
P1E0? This is X0D12 and maps to J1_Pin 39. This looks to be a winner.
So proceed to change your code as follows and then view the results on J1_Pin_39 of the kit.
Code: Select all
out port p_out = XS1_PORT_8A;
out port p_clock_out = XS1_PORT_1E; // changed so we can monitor on J1_Pin_39 on kit
clock clk = XS1_CLKBLK_1; /*identifier for clock named clk*/
configure_clock_rate(clk, 100, 8); /*configures clock to 100/8 =12.5Mhz*/
configure_out_port(p_out, clk, 0);/* configures outputport p_out with 0*/
configure_port_clock_output(p_clock_out , clk);
for (int i=0; i<20; i++)
p_out <: i;
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