Start implementation of onewire temperature sensor interface

stm-firmware/Makefile

@@ -49,6 +49,8 @@ CFILES += rotary-encoder.c
 
 CFILES += stack-check.c
 
+CFILES += onewire-if.c onewire-temp-sensors.c
+
 DEFINES += -DDEBUGBUILD
 
 ###################################################################################

stm-firmware/include/reflow-controller/onewire-if.h

@@ -23,7 +23,9 @@
 
 #include <stm-periph/uart.h>
 
-int onewire_if_init_uart(struct stm_uart *uart);
+int onewire_if_init_uart(struct stm_uart *uart, uint32_t brr_val, USART_TypeDef *onewire_uart, volatile uint32_t *rcc_reg, uint8_t rcc_bit_num);
+
+void onewire_if_disable(struct stm_uart *uart);
 
 int onewire_if_send_byte(struct stm_uart *uart);
 

stm-firmware/include/reflow-controller/onewire-temp-sensors.h

@@ -18,8 +18,30 @@
 * If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <stddef.h>
+#include <stdint.h>
 
 #ifndef __ONEWIRE_TEMP_SENSORS_H__
 #define __ONEWIRE_TEMP_SENSORS_H__
 
+#define ONEWIRE_TEMP_PORT GPIOB
+#define ONEWIRE_TEMP_RCC_MASK RCC_AHB1ENR_GPIOBEN
+#define ONEWIRE_TEMP_TX_PIN 10U
+#define ONEWIRE_TEMP_RX_PIN 11U
+#define ONEWIRE_TEMP_AF_NUM 7U
+
+#define ONEWIRE_UART_DEV USART3
+
+void onewire_temp_sensors_setup_hw();
+
+/**
+ * @brief onewire_temp_sensors_discover
+ * @param id_list
+ * @param list_len
+ * @return Negative: error, >= 0: amount of discovered sensors
+ */
+int onewire_temp_sensors_discover(uint32_t *id_list, size_t list_len);
+
+float onewire_temp_sensor_read_temp(uint32_t id);
+
 #endif /* __ONEWIRE_TEMP_SENSORS_H__ */

stm-firmware/include/stm-periph/stm32-gpio-macros.h

@@ -28,6 +28,7 @@
 #define PINMASK(pin) ((0x3) << (pin * 2))
 #define SETAF(PORT,PIN,AF)  PORT->AFR[(PIN < 8 ? 0 : 1)] |= AF << ((PIN < 8 ? PIN : (PIN - 8)) * 4)
 #define ANALOG(pin)  (0x03 << (pin * 2))
+#define OTYP_OPENDRAIN(pin) (0x1U << (pin))
 
 #define BITMASK_TO_BITNO(x) (x&0x1?0:x&0x2?1:x&0x4?2:x&0x8?3: \
 		 x&0x10?4:x&0x20?5:x&0x40?6:x&0x80?7: \

stm-firmware/onewire-if.c

@@ -19,3 +19,38 @@
 */
 
 #include <reflow-controller/onewire-if.h>
+
+int onewire_if_init_uart(struct stm_uart *uart, uint32_t brr_val, USART_TypeDef *onewire_uart, volatile uint32_t *rcc_reg, uint8_t rcc_bit_num)
+{
+	if (!uart)
+		return -1000;
+
+	uart->rx = 1;
+	uart->tx = 1;
+	uart->brr_val = brr_val;
+	uart->rcc_reg = rcc_reg;
+	uart->uart_dev = onewire_uart;
+	uart->rcc_bit_no = rcc_bit_num;
+	uart->dma_rx_buff = NULL;
+	uart->dma_tx_buff = NULL;
+
+	return uart_init(uart);
+}
+
+void onewire_if_disable(struct stm_uart *uart)
+{
+	if (!uart)
+		return;
+
+	uart_disable(uart);
+}
+
+int onewire_if_send_byte(struct stm_uart *uart)
+{
+
+}
+
+int onewire_if_receive_byte(struct stm_uart *uart)
+{
+
+}

stm-firmware/onewire-temp-sensors.c

@@ -18,5 +18,25 @@
 * If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <stm32/stm32f4xx.h>
+#include <stm-periph/uart.h>
+#include <reflow-controller/onewire-if.h>
+#include <reflow-controller/onewire-temp-sensors.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <stm-periph/stm32-gpio-macros.h>
+
+static struct stm_uart if_uart;
+
+void onewire_temp_sensors_setup_hw()
+{
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ONEWIRE_TEMP_RCC_MASK));
+
+	ONEWIRE_TEMP_PORT->OTYPER |= OTYP_OPENDRAIN(ONEWIRE_TEMP_TX_PIN);
+	ONEWIRE_TEMP_PORT->MODER &= MODER_DELETE(ONEWIRE_TEMP_RX_PIN) & MODER_DELETE(ONEWIRE_TEMP_TX_PIN);
+	ONEWIRE_TEMP_PORT->MODER |= ALTFUNC(ONEWIRE_TEMP_RX_PIN) | ALTFUNC(ONEWIRE_TEMP_TX_PIN);
+	SETAF(ONEWIRE_TEMP_PORT, ONEWIRE_TEMP_RX_PIN, ONEWIRE_TEMP_AF_NUM);
+	SETAF(ONEWIRE_TEMP_PORT, ONEWIRE_TEMP_TX_PIN, ONEWIRE_TEMP_AF_NUM);
+
+	(void)onewire_if_init_uart(&if_uart, 1, ONEWIRE_UART_DEV, &RCC->APB1ENR, BITMASK_TO_BITNO(RCC_APB1ENR_USART3EN));
+}
 
-#include <reflow-controller/onewire-temp-sensors.h>