Base i2c master functions

1 files changed, 29 insertions, 0 deletions

diff --git a/main/i2c.c b/main/i2c.c
new file mode 100644
index 0000000..7ab1d14
--- /dev/null
+++ b/main/i2c.c
@@ -0,0 +1,29 @@
+#include "i2c.h"
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <pico/stdlib.h>
+#include <hardware/i2c.h>
+
+void init_i2c() {
+    stdio_init_all();
+	i2c_init(i2c_default, 100 * 1000);
+
+	// Initialize I2C pins - sda(16), scl(17)
+    gpio_set_function(SDA_PIN, GPIO_FUNC_I2C);
+    gpio_set_function(SCL_PIN, GPIO_FUNC_I2C);
+
+    gpio_pull_up(SDA_PIN);
+    gpio_pull_up(SCL_PIN);
+}
+
+int read_i2c(uint8_t addr, uint8_t *output, size_t len) {
+    // false - finished with bus
+    return i2c_read_blocking (i2c_default, addr, output, len, false);
+}
+
+int write_i2c(uint8_t addr, uint8_t *input, size_t len) {
+    // true to keep master control of bus
+    return i2c_write_blocking (i2c_default, addr, input, len, true);
+}