diff --git a/stm-firmware/include/reflow-controller/shell-uart-config.h b/stm-firmware/include/reflow-controller/shell-uart-config.h
new file mode 100644
index 0000000..b9141c4
--- /dev/null
+++ b/stm-firmware/include/reflow-controller/shell-uart-config.h
@@ -0,0 +1,33 @@
+#ifndef __SHELL_UART_CONFIG_H__
+#define __SHELL_UART_CONFIG_H__
+
+#define SHELL_UART_RECEIVE_DMA_STREAM DMA2_Stream5
+
+#define SHELL_UART_SEND_DMA_STREAM DMA2_Stream7
+
+#define SHELL_UART_PERIPH USART1
+#define SHELL_UART_RCC_REG RCC->APB2ENR
+#define SHELL_UART_RCC_MASK RCC_APB2ENR_USART1EN
+
+#define SHELL_UART_RX_DMA_TRIGGER 4U
+#define SHELL_UART_TX_DMA_TRIGGER 4U
+
+#ifdef DEBUGBUILD
+
+#define SHELL_UART_PORT GPIOA
+#define SHELL_UART_PORT_RCC_MASK RCC_AHB1ENR_GPIOAEN
+#define SHELL_UART_RX_PIN 10
+#define SHELL_UART_TX_PIN 9
+#define SHELL_UART_RX_PIN_ALTFUNC 7
+#define SHELL_UART_TX_PIN_ALTFUNC 7
+#else
+
+#endif
+
+/* UART_DIV is 45.5625 => 115200 @ 84 MHz */
+#define SHELL_UART_DIV_FRACTION 9U /* Equals 9/16 = 0.5625 */
+#define SHELL_UART_DIV_MANTISSA 45U /* Equals 45 */
+
+#define SHELL_UART_BRR_REG_VALUE ((SHELL_UART_DIV_MANTISSA<<4) | SHELL_UART_DIV_FRACTION);
+
+#endif /* __SHELL_UART_CONFIG_H__ */
diff --git a/stm-firmware/include/reflow-controller/shell.h b/stm-firmware/include/reflow-controller/shell.h
index a93c9aa..72a94d2 100644
--- a/stm-firmware/include/reflow-controller/shell.h
+++ b/stm-firmware/include/reflow-controller/shell.h
@@ -24,7 +24,7 @@
 #include <stddef.h>
 #include <shellmatta.h>
 
-shellmatta_handle_t shell_init(void);
+shellmatta_handle_t shell_init(shellmatta_write_t write_func);
 
 void shell_handle_input(shellmatta_handle_t shell, const char *data, size_t len);