mirror of https://github.com/SMFSW/cI2C
45 lines
1.0 KiB
C++
45 lines
1.0 KiB
C++
/*
|
|
Master i2c write
|
|
Write some bytes to FRAM and compare them
|
|
with what's read afterwards
|
|
|
|
This example code is in the public domain.
|
|
|
|
created Jan 12 2017
|
|
latest mod Jan 16 2017
|
|
by SMFSW
|
|
*/
|
|
|
|
#include <ci2c.h>
|
|
|
|
I2C_SLAVE FRAM;
|
|
|
|
void setup() {
|
|
Serial.begin(115200); // start serial for output
|
|
I2C_init(I2C_LOW); // init with low speed (400KHz)
|
|
I2C_slave_init(&FRAM, 0x50, I2C_16B_REG);
|
|
}
|
|
|
|
void loop() {
|
|
const uint16_t reg_addr = 0xF000;
|
|
uint8_t str[7] = { 0x55, 20, 30, 40, 50, 60, 0xAA };
|
|
bool match = true;
|
|
uint8_t str_out[7];
|
|
memset(&str_out, 0xEE, sizeof(str));
|
|
|
|
I2C_write(&FRAM, reg_addr, &str[0], sizeof(str)); // Addr 0, 2bytes Addr size, str, read chars for size of str
|
|
|
|
Serial.println();
|
|
|
|
I2C_read(&FRAM, reg_addr, &str_out[0], sizeof(str));
|
|
for (uint8_t i = 0; i < sizeof(str_out); i++)
|
|
{
|
|
if (str[i] != str_out[i]) { match = false; }
|
|
Serial.print(str_out[i], HEX); // receive a byte as character
|
|
Serial.print(" ");
|
|
}
|
|
Serial.print("WRITE ");
|
|
Serial.print(match ? "OK" : "NOK");
|
|
|
|
while(1);
|
|
} |