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firmware/c: use 200 MHz clock for pio #40

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firmware/c: use 200 MHz clock for pio #40

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4 changes: 4 additions & 0 deletions firmware/c/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -23,3 +23,7 @@ pico_add_extra_outputs(picoemp)
# enable usb output, disable uart output
pico_enable_stdio_usb(picoemp 1)
pico_enable_stdio_uart(picoemp 0)

# Use 200MHz clock for pio, for 5ns precision in fast trigger mode
# RP2040 is certified to run at 200MHz, see https://github.com/raspberrypi/pico-sdk/releases/tag/2.1.1
add_definitions(-DSYS_CLK_MHZ=200)
2 changes: 1 addition & 1 deletion firmware/c/main.c
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Expand Up @@ -17,7 +17,7 @@ static uint offset = 0xFFFFFFFF;

// defaults taken from original code
#define PULSE_DELAY_CYCLES_DEFAULT 0
#define PULSE_TIME_CYCLES_DEFAULT 625 // 5us in 8ns cycles
#define PULSE_TIME_CYCLES_DEFAULT 1000 // 5us in 5ns cycles
#define PULSE_TIME_US_DEFAULT 5 // 5us
#define PULSE_POWER_DEFAULT 0.0122
static uint32_t pulse_time;
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10 changes: 5 additions & 5 deletions firmware/c/serial.c
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Expand Up @@ -12,7 +12,7 @@ static char serial_buffer[256];
static char last_command[256];

#define PULSE_DELAY_CYCLES_DEFAULT 0
#define PULSE_TIME_CYCLES_DEFAULT 625 // 5us in 8ns cycles
#define PULSE_TIME_CYCLES_DEFAULT 1000 // 5us in 5ns cycles
#define PULSE_TIME_US_DEFAULT 5 // 5us
#define PULSE_POWER_DEFAULT 0.0122
static uint32_t pulse_time;
Expand Down Expand Up @@ -160,10 +160,10 @@ bool handle_command(char *command) {
if(strcmp(command, "fa") == 0 || strcmp(command, "fast_trigger_configure") == 0) {
char **unused;
printf(" configure in cycles\n");
printf(" 1 cycle = 8ns\n");
printf(" 1us = 125 cycles\n");
printf(" 1ms = 125000 cycles\n");
printf(" max = MAX_UINT32 = 4294967295 cycles = 34359ms\n");
printf(" 1 cycle = 5ns\n");
printf(" 1us = 200 cycles\n");
printf(" 1ms = 200000 cycles\n");
printf(" max = MAX_UINT32 = 4294967295 cycles = 21475ms\n");

printf(" pulse_delay_cycles (current: %d, default: %d)?\n> ", pulse_delay_cycles, PULSE_DELAY_CYCLES_DEFAULT);
read_line();
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