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fixup examples based on default pin #define-s and also support them being undefined

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This commit is contained in:
graham sanderson
2021-02-28 09:00:36 -06:00
committed by Graham Sanderson
parent 9c7e31b8e7
commit 82b6dc0576
10 changed files with 101 additions and 43 deletions
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21
i2c/bus_scan/bus_scan.c
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@@ -22,6 +22,7 @@
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/binary_info.h"
#include "hardware/i2c.h"
// I2C reserves some addresses for special purposes. We exclude these from the scan.
@@ -33,13 +34,18 @@ bool reserved_addr(uint8_t addr) {
int main() {
// Enable UART so we can print status output
stdio_init_all();
// This example will use I2C0 on GPIO4 (SDA) and GPIO5 (SCL)
i2c_init(i2c0, 100 * 1000);
gpio_set_function(4, GPIO_FUNC_I2C);
gpio_set_function(5, GPIO_FUNC_I2C);
gpio_pull_up(4);
gpio_pull_up(5);
#if !defined(i2c_default) || !defined(PICO_DEFAULT_I2C_SDA_PIN) || !defined(PICO_DEFAULT_I2C_SCL_PIN)
#warning i2c/bus_scane example requires a board with I2C pins
puts("Default I2C pins were not defined");
#else
// This example will use I2C0 on the default SDA and SCL pins (4, 5 on a Pico)
i2c_init(i2c_default, 100 * 1000);
gpio_set_function(PICO_DEFAULT_I2C_SDA_PIN, GPIO_FUNC_I2C);
gpio_set_function(PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C);
gpio_pull_up(PICO_DEFAULT_I2C_SDA_PIN);
gpio_pull_up(PICO_DEFAULT_I2C_SCL_PIN);
// Make the I2C pins available to picotool
bi_decl(bi_2pins_with_func(PICO_DEFAULT_I2C_SDA_PIN, PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C));
printf("\nI2C Bus Scan\n");
printf(" 0 1 2 3 4 5 6 7 8 9 A B C D E F\n");
@@ -67,4 +73,5 @@ int main() {
}
printf("Done.\n");
return 0;
#endif
}