diff --git a/lib/onewire_slave.c b/lib/onewire_slave.c
index 0bf87ab..0d64c84 100644
--- a/lib/onewire_slave.c
+++ b/lib/onewire_slave.c
@@ -12,10 +12,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-/** library for 1-wire protocol as master (code)
- *  @file onewire_slave.c
+/** library for 1-wire protocol as master
+ *  @file
  *  @author King Kévin <kingkevin@cuvoodoo.info>
- *  @date 2017
+ *  @date 2017-2020
  *  @note peripherals used: GPIO and timer @ref onewire_slave_timer, GPIO @ref onewire_slave_gpio
  *  @note overdrive mode is not supported
  *  @implements 1-Wire protocol description from Book of iButton Standards
@@ -125,15 +125,15 @@ void onewire_slave_setup(uint8_t family, uint64_t serial)
 	rcc_periph_clock_enable(RCC_TIM(ONEWIRE_SLAVE_TIMER)); // enable clock for timer peripheral
 	rcc_periph_reset_pulse(RST_TIM(ONEWIRE_SLAVE_TIMER)); // reset timer state
 	timer_set_mode(TIM(ONEWIRE_SLAVE_TIMER), TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); // set timer mode, use undivided timer clock, edge alignment (simple count), and count up
-	timer_set_prescaler(TIM(ONEWIRE_SLAVE_TIMER), 1-1); // don't use prescale since this 16 bits timer allows to wait > 480 us used for the reset pulse ( 1/(72E6/1/(2**16))=910us )
+	timer_set_prescaler(TIM(ONEWIRE_SLAVE_TIMER), 1 - 1); // don't use prescale since this 16 bits timer allows to wait > 480 us used for the reset pulse ( 1/(72E6/1/(2**16))=910us )
 
 	// use comparator to time signal (without using the output), starting at slot start
-	timer_set_period(TIM(ONEWIRE_SLAVE_TIMER), 480*(rcc_ahb_frequency/1000000)-1-1300); // minimum time needed for a reset pulse (480 < Trst), plus hand tuning
+	timer_set_period(TIM(ONEWIRE_SLAVE_TIMER), 480 * (rcc_ahb_frequency / 1000000) - 1 - 1300); // minimum time needed for a reset pulse (480 < Trst), plus hand tuning
 	timer_set_oc_mode(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC1, TIM_OCM_FROZEN);
-	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC1, 16*(rcc_ahb_frequency/1000000)-1); // time to wait before sending the presence pulse, after the rising edge of the reset pulse (15 < Tpdh < 60)
+	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC1, 16 * (rcc_ahb_frequency / 1000000) - 1); // time to wait before sending the presence pulse, after the rising edge of the reset pulse (15 < Tpdh < 60)
 	timer_set_oc_mode(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC2, TIM_OCM_FROZEN);
-	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC2, 45*(rcc_ahb_frequency/1000000)-1-350); // time to sample the bit after being set (1 < Tlow1 < 15, 60 < Tslot < 120), or stop sending the bit use compare function to detect slave presence (15 = Trdv + 0 < Trelease < 45), plus hand tuning
-	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC3, 90*(rcc_ahb_frequency/1000000)-1); // time to stop the presence pulse (60 < Tpdl < 120)
+	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC2, 45 * (rcc_ahb_frequency / 1000000) - 1 - 350); // time to sample the bit after being set (1 < Tlow1 < 15, 60 < Tslot < 120), or stop sending the bit use compare function to detect slave presence (15 = Trdv + 0 < Trelease < 45), plus hand tuning
+	timer_set_oc_value(TIM(ONEWIRE_SLAVE_TIMER), TIM_OC3, 90 * (rcc_ahb_frequency / 1000000) - 1); // time to stop the presence pulse (60 < Tpdl < 120)
 	timer_clear_flag(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_UIF | TIM_SR_CC1IF | TIM_SR_CC2IF | TIM_SR_CC3IF); // clear all interrupt flags
 	timer_update_on_overflow(TIM(ONEWIRE_SLAVE_TIMER)); // only use counter overflow as UEV source (use overflow as start time or timeout)
 	timer_enable_irq(TIM(ONEWIRE_SLAVE_TIMER), TIM_DIER_UIE); // enable update interrupt for overflow
@@ -156,13 +156,13 @@ void onewire_slave_setup(uint8_t family, uint64_t serial)
 
 bool onewire_slave_function_read(uint8_t* data, size_t size)
 {
-	if (NULL==data || 0==size) { // verify input
+	if (NULL == data || 0 == size) { // verify input
 		return false;
 	}
-	if (UINT32_MAX/8<size) { // too many bits to transfer
+	if (UINT32_MAX / 8 < size) { // too many bits to transfer
 		return false;
 	}
-	if (onewire_slave_state!=ONEWIRE_STATE_FUNCTION_DATA) { // not in the right state to transfer data
+	if (onewire_slave_state != ONEWIRE_STATE_FUNCTION_DATA) { // not in the right state to transfer data
 		return false;
 	}
 	onewire_slave_transfer_data = data; // save buffer to write to
@@ -175,13 +175,13 @@ bool onewire_slave_function_read(uint8_t* data, size_t size)
 
 bool onewire_slave_function_write(const uint8_t* data, size_t size)
 {
-	if (NULL==data || 0==size) { // verify input
+	if (NULL == data || 0 == size) { // verify input
 		return false;
 	}
-	if (onewire_slave_state!=ONEWIRE_STATE_FUNCTION_DATA) { // not in the right state to transfer data
+	if (onewire_slave_state != ONEWIRE_STATE_FUNCTION_DATA) { // not in the right state to transfer data
 		return false;
 	}
-	if (UINT32_MAX/8<size) { // too many bits to transfer
+	if (UINT32_MAX / 8 < size) { // too many bits to transfer
 		return false;
 	}
 	onewire_slave_transfer_data = (uint8_t*)data; // save buffer to read from
@@ -234,7 +234,7 @@ void EXTI_ISR(ONEWIRE_SLAVE_PIN)(void)
 			case ONEWIRE_STATE_ROM_SEARCH_FALSE: // send ROM code bit while searching ROM, already negated
 			case ONEWIRE_STATE_FUNCTION_WRITE: // write function data bit
 				timer_enable_irq(TIM(ONEWIRE_SLAVE_TIMER), TIM_DIER_CC2IE); // enable timer for reading bit
-				if (0==(bits_buffer&(1<<(bits_bit%8)))) { // need to send a 0 bit
+				if (0 == (bits_buffer & (1 << (bits_bit % 8)))) { // need to send a 0 bit
 					gpio_clear(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN)); // hold low to send 0 bit
 				}
 				break;
@@ -252,7 +252,7 @@ void EXTI_ISR(ONEWIRE_SLAVE_PIN)(void)
 void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 {
 	if (timer_interrupt_source(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_UIF)) { // reset timer triggered, verify if it's a reset
-		if (0==gpio_get(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN))) { // signal it still low, thus it must be a reset
+		if (0 == gpio_get(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN))) { // signal it still low, thus it must be a reset
 			onewire_slave_state = ONEWIRE_STATE_RESET; // update state
 		}
 		timer_disable_counter(TIM(ONEWIRE_SLAVE_TIMER)); // stop timer since there is nothing more to measure
@@ -261,7 +261,7 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 	}
 	if (timer_interrupt_source(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_CC1IF)) { // wait for presence pulse timer triggered
 		timer_clear_flag(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_CC1IF); // clear flag
-		if (ONEWIRE_STATE_WAIT_PRESENCE==onewire_slave_state) { // we can now send the pulse
+		if (ONEWIRE_STATE_WAIT_PRESENCE == onewire_slave_state) { // we can now send the pulse
 			onewire_slave_state = ONEWIRE_STATE_PULSE_PRESENCE; // save new state
 			gpio_clear(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN)); // send presence pulse (will also trigger the timer start)
 		}
@@ -275,9 +275,9 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 			case ONEWIRE_STATE_ROM_SEARCH_SELECT: // read selected ROM code bit
 			case ONEWIRE_STATE_FUNCTION_READ: // read function data bit
 				if (gpio_get(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN))) { // bit is set to 1
-					bits_buffer |= (1<<(bits_bit%8)); // set bit
+					bits_buffer |= (1 << (bits_bit % 8)); // set bit
 				} else { // bit is set to 0
-					bits_buffer &= ~(1<<(bits_bit%8)); // clear bit
+					bits_buffer &= ~(1 << (bits_bit % 8)); // clear bit
 				}
 				bits_bit++; // go to next bit
 				break;
@@ -297,7 +297,7 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 		// act on bit count
 		switch (onewire_slave_state) {
 			case ONEWIRE_STATE_ROM_COMMAND: // read ROM command
-				if (bits_bit>7) { // complete ROM command code received
+				if (bits_bit > 7) { // complete ROM command code received
 					bits_bit = 0; // reset buffer
 					rom_code_byte = 0; // reset ROM code byte index
 					switch (bits_buffer) { // act depending on ROM command code
@@ -322,7 +322,7 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 				}
 				break;
 			case ONEWIRE_STATE_ROM_READ: // send ROM code
-				if (bits_bit>7) { // complete byte transmitted
+				if (bits_bit > 7) { // complete byte transmitted
 					rom_code_byte++; // go to next ROM code byte
 					if (rom_code_byte>LENGTH(onewire_slave_rom_code)) { // complete ROM code send
 						onewire_slave_state = ONEWIRE_STATE_IDLE; // go back to default idle state
@@ -333,11 +333,11 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 				}
 				break;
 			case ONEWIRE_STATE_ROM_MATCH: // compare ROM code
-				if (bits_bit>7) { // complete byte received
-					if (bits_buffer==onewire_slave_rom_code[rom_code_byte]) { // ROM code byte matches
+				if (bits_bit > 7) { // complete byte received
+					if (bits_buffer == onewire_slave_rom_code[rom_code_byte]) { // ROM code byte matches
 						bits_bit = 0; // reset buffer
 						rom_code_byte++; // go to next ROM code byte
-						if (rom_code_byte>=LENGTH(onewire_slave_rom_code)) { // complete ROM code matches
+						if (rom_code_byte >= LENGTH(onewire_slave_rom_code)) { // complete ROM code matches
 							onewire_slave_state = ONEWIRE_STATE_FUNCTION_COMMAND; // now read function command code
 						}
 					} else { // ROM code does not match
@@ -346,22 +346,22 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 				}
 				break;
 			case ONEWIRE_STATE_ROM_SEARCH_TRUE: // ROM code bit is send, prepare to send negated version
-				bits_buffer ^= (1<<bits_bit); // negate bit
+				bits_buffer ^= (1 << bits_bit); // negate bit
 				onewire_slave_state = ONEWIRE_STATE_ROM_SEARCH_FALSE; // send negated version
 				break;
 			case ONEWIRE_STATE_ROM_SEARCH_FALSE: // negated ROM code bit is send, prepare to read selected bit
 				onewire_slave_state = ONEWIRE_STATE_ROM_SEARCH_SELECT; // read selected
 				break;
 			case ONEWIRE_STATE_ROM_SEARCH_SELECT: // check if we are selected
-				if ((bits_buffer&(1<<(bits_bit-1)))==(onewire_slave_rom_code[rom_code_byte]&(1<<(bits_bit-1)))) { // we have been selected
+				if ((bits_buffer&(1 << (bits_bit - 1))) == (onewire_slave_rom_code[rom_code_byte] & (1 << (bits_bit - 1)))) { // we have been selected
 					onewire_slave_state = ONEWIRE_STATE_ROM_SEARCH_TRUE; // prepare to compare next bit
 				} else { // we are no selected
 					onewire_slave_state = ONEWIRE_STATE_IDLE; // go back to idle
 				}
-				if (bits_bit>7) { // complete byte searched
+				if (bits_bit > 7) { // complete byte searched
 					bits_bit = 0; // reset buffer
 					rom_code_byte++; // go to next ROM code byte
-					if (rom_code_byte>=LENGTH(onewire_slave_rom_code)) { // complete ROM code search
+					if (rom_code_byte >= LENGTH(onewire_slave_rom_code)) { // complete ROM code search
 						onewire_slave_state = ONEWIRE_STATE_FUNCTION_COMMAND; // now read function command code
 					} else {
 						bits_buffer = onewire_slave_rom_code[rom_code_byte]; // prepare next ROM code byte
@@ -369,27 +369,27 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 				}
 				break;
 			case ONEWIRE_STATE_FUNCTION_COMMAND: // read function command
-				if (bits_bit>7) { // complete function command code received
+				if (bits_bit > 7) { // complete function command code received
 					onewire_slave_function_code = bits_buffer; // save function command code to user buffer
 					onewire_slave_state = ONEWIRE_STATE_FUNCTION_DATA; // let the user transfer data
 					onewire_slave_function_code_received = true; // notify user
 				}
 				break;
 			case ONEWIRE_STATE_FUNCTION_READ: // save function data bit
-				if (0==bits_bit%8) { // complete byte received
-					onewire_slave_transfer_data[(bits_bit-1)/8] = bits_buffer; // save received bytes
+				if (0 == bits_bit % 8) { // complete byte received
+					onewire_slave_transfer_data[(bits_bit - 1) / 8] = bits_buffer; // save received bytes
 				}
-				if (bits_bit>=onewire_slave_transfer_bits) { // read transfer complete
-					onewire_slave_transfer_data[(bits_bit-1)/8] = bits_buffer; // save last bits
+				if (bits_bit >= onewire_slave_transfer_bits) { // read transfer complete
+					onewire_slave_transfer_data[(bits_bit - 1) / 8] = bits_buffer; // save last bits
 					onewire_slave_state = ONEWIRE_STATE_FUNCTION_DATA; // let the user transfer more data
 					onewire_slave_transfer_complete = true; // notify user
 				}
 				break;
 			case ONEWIRE_STATE_FUNCTION_WRITE: // update function data bit to write
-				if (0==bits_bit%8) { // complete byte transfer
-					bits_buffer = onewire_slave_transfer_data[bits_bit/8]; // prepare next byte to write
+				if (0 == bits_bit % 8) { // complete byte transfer
+					bits_buffer = onewire_slave_transfer_data[bits_bit / 8]; // prepare next byte to write
 				}
-				if (bits_bit>=onewire_slave_transfer_bits) { // write transfer complete
+				if (bits_bit >= onewire_slave_transfer_bits) { // write transfer complete
 					onewire_slave_state = ONEWIRE_STATE_FUNCTION_DATA; // let the user transfer more data
 					onewire_slave_transfer_complete = true; // notify user
 				}
@@ -401,7 +401,7 @@ void TIM_ISR(ONEWIRE_SLAVE_TIMER)(void)
 	}
 	if (timer_interrupt_source(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_CC3IF)) { // end of presence pulse timer triggered
 		timer_clear_flag(TIM(ONEWIRE_SLAVE_TIMER), TIM_SR_CC3IF); // clear flag
-		if (ONEWIRE_STATE_PULSE_PRESENCE==onewire_slave_state) {
+		if (ONEWIRE_STATE_PULSE_PRESENCE == onewire_slave_state) {
 			gpio_set(GPIO(ONEWIRE_SLAVE_PORT), GPIO(ONEWIRE_SLAVE_PIN)); // stop sending presence pulse
 			// if the pin stays low the reset timer will catch it
 		}
diff --git a/lib/onewire_slave.h b/lib/onewire_slave.h
index af05eb4..94450cd 100644
--- a/lib/onewire_slave.h
+++ b/lib/onewire_slave.h
@@ -12,10 +12,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-/** library for 1-wire protocol as slave (API)
- *  @file onewire_slave.h
+/** library for 1-wire protocol as slave
+ *  @file
  *  @author King Kévin <kingkevin@cuvoodoo.info>
- *  @date 2017
+ *  @date 2017-2020
  *  @note peripherals used: timer @ref onewire_slave_timer, GPIO @ref onewire_slave_gpio
  *  @note overdrive mode is not supported
  */