101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
#include <stdio.h>
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#include "pico/stdlib.h"
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#include "hardware/gpio.h"
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#include "hardware/adc.h"
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#define N_SAMPLES 1000
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uint16_t sample_buf[N_SAMPLES];
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void printhelp() {
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puts("\nCommands:");
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puts("c0, ...\t: Select ADC channel n");
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puts("s\t: Sample once");
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puts("S\t: Sample many");
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puts("w\t: Wiggle pins");
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}
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void __not_in_flash_func(adc_capture)(uint16_t *buf, size_t count) {
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adc_fifo_setup(true, false, 0, false, false);
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adc_run(true);
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for (int i = 0; i < count; i = i + 1)
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buf[i] = adc_fifo_get_blocking();
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adc_run(false);
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adc_fifo_drain();
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}
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int main(void) {
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stdio_init_all();
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adc_init();
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adc_set_temp_sensor_enabled(true);
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// Set all pins to input (as far as SIO is concerned)
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gpio_set_dir_all_bits(0);
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for (int i = 2; i < 30; ++i) {
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gpio_set_function(i, GPIO_FUNC_SIO);
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if (i >= 26) {
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gpio_disable_pulls(i);
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gpio_set_input_enabled(i, false);
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}
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}
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printf("\n===========================\n");
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printf("RP2040 ADC and Test Console\n");
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printf("===========================\n");
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printhelp();
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while (1) {
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char c = getchar();
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printf("%c", c);
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switch (c) {
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case 'c':
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c = getchar();
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printf("%c\n", c);
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if (c < '0' || c > '7') {
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printf("Unknown input channel\n");
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printhelp();
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} else {
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adc_select_input(c - '0');
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printf("Switched to channel %c\n", c);
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}
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break;
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case 's': {
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uint32_t result = adc_read();
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const float conversion_factor = 3.3f / (1 << 12);
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printf("\n0x%03x -> %f V\n", result, result * conversion_factor);
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break;
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}
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case 'S': {
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printf("\nStarting capture\n");
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adc_capture(sample_buf, N_SAMPLES);
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printf("Done\n");
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for (int i = 0; i < N_SAMPLES; i = i + 1)
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printf("%03x\n", sample_buf[i]);
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break;
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}
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case 'w':
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printf("\nPress any key to stop wiggling\n");
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int i = 1;
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gpio_set_dir_all_bits(-1);
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while (getchar_timeout_us(0) == PICO_ERROR_TIMEOUT) {
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// Pattern: Flash all pins for a cycle,
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// Then scan along pins for one cycle each
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i = i ? i << 1 : 1;
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gpio_put_all(i ? i : ~0);
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}
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gpio_set_dir_all_bits(0);
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printf("Wiggling halted.\n");
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break;
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case '\n':
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case '\r':
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break;
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case 'h':
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printhelp();
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break;
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default:
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printf("\nUnrecognised command: %c\n", c);
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printhelp();
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break;
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}
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}
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}
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