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add sanity check

This commit is contained in:
King Kévin 2017-02-09 12:44:27 +01:00
parent 9c5c535e85
commit e26b2108ca
1 changed files with 15 additions and 4 deletions
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19
lib/i2c.c
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@ -16,7 +16,7 @@
* @file i2c.h
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2017
* @note peripherals used: I2C @ref i2c_i2c, timer @i2c_timer
* @note peripherals used: I2C @ref i2c_i2c, timer @ref i2c_timer
*/
/* standard libraries */
@ -98,13 +98,18 @@ void i2c_master(bool fast)
bool i2c_read(uint8_t slave, const uint8_t* address, size_t address_size, uint8_t* data, size_t data_size)
{
// sanity check
if (address==NULL || address_size==0 || data==NULL || data_size==0) {
if (address==NULL || address_size==0 || data==NULL || data_size==0) { // input data is erroneous
return false;
}
if (I2C_SR2(I2C(I2C_I2C)) & I2C_SR2_BUSY) { // I2C device is busy
return false;
}
if (I2C_SR2(I2C(I2C_I2C)) & I2C_SR2_MSL) { // I2C device is already in master mode
return false;
}
bool to_return = false; // return if read succeeded
// send start condition
i2c_send_start(I2C(I2C_I2C)); // send start condition to start transaction
timer_set_counter(TIM(I2C_TIMER),0); // restart timer
@ -216,7 +221,13 @@ error:
bool i2c_write(uint8_t slave, const uint8_t* address, size_t address_size, const uint8_t* data, size_t data_size)
{
// sanity check
if (address==NULL || address_size==0 || data==NULL || data_size==0) {
if (address==NULL || address_size==0 || data==NULL || data_size==0) { // input data is erroneous
return false;
}
if (I2C_SR2(I2C(I2C_I2C)) & I2C_SR2_BUSY) { // I2C device is busy
return false;
}
if (I2C_SR2(I2C(I2C_I2C)) & I2C_SR2_MSL) { // I2C device is already in master mode
return false;
}