Add correct handling of sd card, add reset command, add ls command

stm-firmware/main.c

@@ -34,6 +34,7 @@
 #include <reflow-controller/shell.h>
 #include <reflow-controller/pid-controller.h>
 #include <reflow-controller/digio.h>
+#include "fatfs/shimatta_sdio_driver/shimatta_sdio.h"
 #include <reflow-controller/temp-converter.h>
 #include <reflow-controller/rotary-encoder.h>
 #include <stm-periph/stm32-gpio-macros.h>
@@ -60,6 +61,9 @@ static uint32_t rot;
 static volatile float pid_out;
 static volatile float current_temperature;
 
+FATFS fs;
+FATFS *fs_ptr = &fs;
+
 static inline void uart_gpio_config()
 {
 #ifdef DEBUGBUILD
@@ -104,11 +108,32 @@ static inline void setup_sell_uart(struct stm_uart *uart)
 	NVIC_EnableIRQ(DMA2_Stream7_IRQn);
 }
 
+static bool mount_sd_card_if_avail(bool mounted)
+{
+	FRESULT res;
+
+	if (sdio_check_inserted() && mounted) {
+		memset(fs_ptr, 0, sizeof(FATFS));
+		return false;
+	}
+
+	if (!sdio_check_inserted() && !mounted) {
+		res = f_mount(fs_ptr, "0:/", 1);
+		if (res == FR_OK) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	return mounted;
+}
+
 const char *oven_controller_hello_world = "Hello world :)\n";
 
 int main()
 {
-	FATFS fs;
+	bool sd_card_mounted = false;
 	FIL test_file;
 	const char *uart_input;
 	size_t uart_input_len;
@@ -132,8 +157,10 @@ int main()
 	setup_sell_uart(&shell_uart);
 
 	shell_handle = shell_init(write_shell_callback);
+	shell_print_motd(shell_handle);
 
-	if (f_mount(&fs, "0:/", 1) == FR_OK) {
+	if (f_mount(fs_ptr, "0:/", 1) == FR_OK) {
+		sd_card_mounted = true;
 		f_open(&test_file, "hello-world.txt", FA_OPEN_APPEND | FA_WRITE);
 		f_write(&test_file, oven_controller_hello_world, strlen(oven_controller_hello_world), NULL);
 		f_close(&test_file);
@@ -143,6 +170,9 @@ int main()
 	pid_zero(&pid);
 
 	while (1) {
+
+		sd_card_mounted = mount_sd_card_if_avail(sd_card_mounted);
+
 		pt1000_value_status = adc_pt1000_get_current_resistance(&pt1000_value);
 
 		if (pt1000_value_status >= 0) {