diff --git a/include/shell.h b/include/shell.h
index 14c60af..53ce419 100644
--- a/include/shell.h
+++ b/include/shell.h
@@ -2,7 +2,7 @@
 
 struct cmd {
 	const char *key;
-	void (* exec)(FILE *fp, const char *s);
+	void (* exec)(const char *s);
 };
 
-void cmd_loop(FILE *fp, const char *s);
+void cmd_loop(const char *s);
diff --git a/include/spi_flash.h b/include/spi_flash.h
index d44e289..053ee56 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -30,4 +30,4 @@ void spi_send_cmd(uint32_t dev, const char *cmd, size_t cmd_len,
 	char *data, size_t data_len);
 void spi_flash_read(uint32_t dev, uint32_t addr, char *data, size_t len);
 void spi_flash_write(uint32_t dev, uint32_t addr, char *data, size_t len);
-void spi_flash_erase(FILE *fp, uint32_t dev, uint32_t addr, size_t len);
+void spi_flash_erase(uint32_t dev, uint32_t addr, size_t len);
diff --git a/include/usart.h b/include/usart.h
index 5ac6f1c..557fc0b 100644
--- a/include/usart.h
+++ b/include/usart.h
@@ -1,8 +1,5 @@
 #pragma once
 
-#include <libopencm3/stm32/usart.h>
-
-#include <stdint.h>
 #include <stdio.h>
 
-FILE *init_usart(uint32_t dev);
+void console_init(void);
diff --git a/source/main.c b/source/main.c
index 1f94f13..60d4e7a 100644
--- a/source/main.c
+++ b/source/main.c
@@ -6,11 +6,9 @@
 
 int main(void)
 {
-	FILE *fp;
-
+	console_init();
 	init_spi();
-	fp = init_usart(USART1);
-	cmd_loop(fp, "tbm # ");
+	cmd_loop("tbm # ");
 
 	return 0;
 }
diff --git a/source/shell.c b/source/shell.c
index 5bf5b3b..fe295d3 100644
--- a/source/shell.c
+++ b/source/shell.c
@@ -18,10 +18,10 @@
 #include "spi_flash.h"
 #include "usart.h"
 
-static void do_probe(FILE *fp, const char *s);
-static void do_read(FILE *fp, const char *s);
-static void do_write(FILE *fp, const char *s);
-static void do_erase(FILE *fp, const char *s);
+static void do_probe(const char *s);
+static void do_read(const char *s);
+static void do_write(const char *s);
+static void do_erase(const char *s);
 
 struct cmd cmds[] = {
 	{ "probe", do_probe },
@@ -41,21 +41,21 @@ static void parse_hex(FILE *fp, char *buf, size_t len)
 	for (i = 0; i < len; ++i) {
 		memset(s, '\0', 3);
 
-		while ((s[0] = fgetc(fp)) && !isxdigit(s[0]))
-			fputc(s[0], fp);
+		while ((s[0] = getc(fp)) && !isxdigit(s[0]))
+			putchar(s[0]);
 
-		fputc(s[0], fp);
+		putchar(s[0]);
 
-		while ((s[1] = fgetc(fp)) && !isxdigit(s[1]))
-			fputc(s[1], fp);
+		while ((s[1] = getc(fp)) && !isxdigit(s[1]))
+			putchar(s[1]);
 
-		fputc(s[1], fp);
+		putchar(s[1]);
 
 		*buf++ = strtoul(s, NULL, 16);
 	}
 }
 
-static void print_hex_ascii(FILE *fp, const char *buf, size_t len)
+static void print_hex_ascii(const char *buf, size_t len)
 {
 	size_t n, i;
 	char c;
@@ -65,35 +65,35 @@ static void print_hex_ascii(FILE *fp, const char *buf, size_t len)
 		
 		for (i = 0; i < 16; ++i) {
 			c = (i < n) ? buf[i] : 0;
-			fprintf(fp, "%02x", c);
+			printf("%02x", c);
 		}
 
-		fprintf(fp, " ");
+		printf(" ");
 
 		for (i = 0; i < 16; ++i) {
 			c = (i < n) ? buf[i] : 0;
-			fprintf(fp, "%c", isalnum(c) ? c : '.');
+			printf("%c", isalnum(c) ? c : '.');
 		}
 
-		fprintf(fp, "\n");
+		printf("\n");
 	}
 }
 
-static char *prompt(FILE *fp, const char *prefix)
+static char *prompt(const char *prefix)
 {
 	char *alloc, *line, *s;
 	size_t nbytes = 0, nalloc_bytes = 16;
 	char c;
 
-	fprintf(fp, prefix);
+	printf(prefix);
 
 	if (!(line = malloc(nalloc_bytes)))
 		return NULL;
 
 	s = line;
 
-	while ((c = fgetc(fp)) && c != '\n') {
-		fputc(c, fp);
+	while ((c = getchar()) && c != '\n') {
+		putchar(c);
 
 		if (nbytes + 1 >= nalloc_bytes) {
 			nalloc_bytes *= 2;
@@ -108,7 +108,7 @@ static char *prompt(FILE *fp, const char *prefix)
 		nbytes++;
 	}
 
-	fprintf(fp, "\n");
+	printf("\n");
 	*s = '\0';
 
 	return line;
@@ -118,7 +118,7 @@ err_free_line:
 	return NULL;
 }
 
-static void do_probe(FILE *fp, const char *s)
+static void do_probe(const char *s)
 {
 	char cmd[1] = { CMD_READ_ID };
 	char buf[6];
@@ -126,10 +126,10 @@ static void do_probe(FILE *fp, const char *s)
 	(void)s;
 
 	spi_send_cmd(SPI1, cmd, 1, buf, 6);
-	fprintf(fp, "JEDEC ID: %02x%02x%02x\n", buf[0], buf[1], buf[2]);
+	printf("JEDEC ID: %02x%02x%02x\n", buf[0], buf[1], buf[2]);
 }
 
-static void do_read(FILE *fp, const char *s)
+static void do_read(const char *s)
 {
 	char buf[256], *end = NULL;
 	size_t addr, len, nbytes;
@@ -160,14 +160,14 @@ static void do_read(FILE *fp, const char *s)
 	while (len) {
 		nbytes = min(len, 256);
 		spi_flash_read(SPI1, addr, buf, nbytes);
-		print_hex_ascii(fp, buf, nbytes);
+		print_hex_ascii(buf, nbytes);
 
 		addr += nbytes;
 		len -= nbytes;
 	}
 }
 
-static void do_write(FILE *fp, const char *s)
+static void do_write(const char *s)
 {
 	char buf[256], *end = NULL;
 	size_t addr, len, nbytes;
@@ -197,9 +197,9 @@ static void do_write(FILE *fp, const char *s)
 
 	while (len) {
 		nbytes = (len > 256) ? 256 : len;
-		parse_hex(fp, buf, nbytes);
-		fprintf(fp, "\n");
-		print_hex_ascii(fp, buf, nbytes);
+		parse_hex(stdin, buf, nbytes);
+		printf("\n");
+		print_hex_ascii(buf, nbytes);
 		spi_flash_write(SPI1, addr, buf, nbytes);
 
 		addr += nbytes;
@@ -207,13 +207,11 @@ static void do_write(FILE *fp, const char *s)
 	}
 }
 
-static void do_erase(FILE *fp, const char *s)
+static void do_erase(const char *s)
 {
 	char *end = NULL;
 	size_t addr, len;
 
-	(void)fp;
-
 	if (strncmp(s, "0x", 2) == 0)
 		s += 2;
 
@@ -237,10 +235,10 @@ static void do_erase(FILE *fp, const char *s)
 	if (!len)
 		return;
 
-	spi_flash_erase(fp, SPI1, addr, len);
+	spi_flash_erase(SPI1, addr, len);
 }
 
-static void parse_cmd(FILE *fp, const char *s)
+static void parse_cmd(const char *s)
 {
 	struct cmd *cmd;
 	const char *args;
@@ -255,17 +253,17 @@ static void parse_cmd(FILE *fp, const char *s)
 
 	for (cmd = cmds; cmd->key; cmd++) {
 		if (strcmp(cmd->key, key) == 0)
-			cmd->exec(fp, args);
+			cmd->exec(args);
 	}
 }
 
-void cmd_loop(FILE *fp, const char *show)
+void cmd_loop(const char *show)
 {
 	char *line;
 
 	while (1) {
-		line = prompt(fp, show);
-		parse_cmd(fp, line);
+		line = prompt(show);
+		parse_cmd(line);
 		free(line);
 	}
 }
diff --git a/source/spi_flash.c b/source/spi_flash.c
index b392d5f..039fe94 100644
--- a/source/spi_flash.c
+++ b/source/spi_flash.c
@@ -118,7 +118,7 @@ void spi_flash_write(uint32_t dev, uint32_t addr, char *data, size_t len)
 	spi_disable_write(dev);
 }
 
-void spi_flash_erase(FILE *fp, uint32_t dev, uint32_t addr, size_t len)
+void spi_flash_erase(uint32_t dev, uint32_t addr, size_t len)
 {
 	char cmd[4];
 	size_t size;
@@ -144,7 +144,7 @@ void spi_flash_erase(FILE *fp, uint32_t dev, uint32_t addr, size_t len)
 		default: goto err_disable_write;
 		};
 
-		fprintf(fp, "addr: %lx; size: %u\n", addr, size);
+		printf("addr: %lx; size: %u\n", addr, size);
 		spi_flash_addr(cmd, addr);
 		spi_send_cmd(dev, cmd, 4, NULL, 0);
 	}
diff --git a/source/usart.c b/source/usart.c
index c08d5ff..a8b0791 100644
--- a/source/usart.c
+++ b/source/usart.c
@@ -47,11 +47,8 @@ static ssize_t usart_write(void *cookie, const char *buf, size_t n)
 	return i;
 }
 
-FILE *init_usart(uint32_t dev)
+static void usart_init(void)
 {
-	cookie_io_functions_t stub = { usart_read, usart_write, NULL, NULL };
-	FILE *fp;
-
 	/* Set up clocks for USART 1 */
 	rcc_periph_clock_enable(RCC_GPIOA);
 	rcc_periph_clock_enable(RCC_USART1);
@@ -61,16 +58,37 @@ FILE *init_usart(uint32_t dev)
 	gpio_set_af(GPIOA, GPIO_AF1, GPIO9 | GPIO10);
 	gpio_set_af(GPIOA, GPIO_AF1, GPIO10);
 
-	usart_set_baudrate(dev, 115200);
-	usart_set_databits(dev, 8);
-	usart_set_parity(dev, USART_PARITY_NONE);
-	usart_set_stopbits(dev, USART_CR2_STOP_1_0BIT);
-	usart_set_mode(dev, USART_MODE_TX_RX);
-	usart_set_flow_control(dev, USART_FLOWCONTROL_NONE);
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_stopbits(USART1, USART_CR2_STOP_1_0BIT);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART1);
+}
+
+void console_init(void)
+{
+	cookie_io_functions_t console_in = {
+		.read = usart_read,
+		.write = NULL,
+		.seek = NULL,
+		.close = NULL,
+	};
+	cookie_io_functions_t console_out = {
+		.read = NULL,
+		.write = usart_write,
+		.seek = NULL,
+		.close = NULL,
+	};
+
+	usart_init();
 
-	usart_enable(dev);
+	stdin = fopencookie((void *)USART1, "r", console_in);
+	stdout = fopencookie((void *)USART1, "w", console_out);
+	stderr = fopencookie((void *)USART1, "w", console_out);
 
-	fp = fopencookie((void *)dev, "rw+", stub);
-	setvbuf(fp, NULL, _IONBF, 0);
-	return fp;
+	setlinebuf(stdout);
+	setbuf(stderr, NULL);
 }