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adds immediate i2c return, fixes ez matrix code

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This commit is contained in:
Jack Humbert 2018-06-23 14:18:47 -04:00
parent 6380f83190
commit 7a44ad83fc
5 changed files with 35 additions and 31 deletions
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12
drivers/avr/i2c_master.c
View file

@ -28,7 +28,7 @@ i2c_status_t i2c_start(uint8_t address, uint16_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@ -43,7 +43,7 @@ i2c_status_t i2c_start(uint8_t address, uint16_t timeout)
timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@ -64,7 +64,7 @@ i2c_status_t i2c_write(uint8_t data, uint16_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@ -82,7 +82,7 @@ int16_t i2c_read_ack(uint16_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@ -99,7 +99,7 @@ int16_t i2c_read_nack(uint16_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@ -210,7 +210,7 @@ i2c_status_t i2c_stop(uint16_t timeout)
uint16_t timeout_timer = timer_read();
while(TWCR & (1<<TWSTO)) {
if (timeout && ((timer_read() - timeout_timer) > timeout)) {
if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
return I2C_STATUS_TIMEOUT;
}
}

3
drivers/avr/i2c_master.h
View file

@ -14,6 +14,9 @@ typedef int16_t i2c_status_t;
#define I2C_STATUS_ERROR (-1)
#define I2C_STATUS_TIMEOUT (-2)
#define I2C_TIMEOUT_IMMEDIATE (0)
#define I2C_TIMEOUT_INFINITE (0xFFFF)
void i2c_init(void);
i2c_status_t i2c_start(uint8_t address, uint16_t timeout);
i2c_status_t i2c_write(uint8_t data, uint16_t timeout);