So I've been working with an nRF52832 on a custom board, and it has an external flash, mx25r1635f to be exact, and that is mounted with littleFS to use for data storage. It mounts, reads, writes all fine until I start working with bigger data, then it starts giving me error -5, which is I/O error, but I know my connections should be good and it happens on multiple PCBs. I started messing around with the firmware until I realized that the problem happened at a file size of exaclty 63, but would eventually like maybe 30 or 40 trys manage to write a couple of bytes again. This problem happens even in the sample code for file handling if I put it to append the pattern data to the file. After looking through the code trying to find something that could be related I saw that the cache-size attribute was 64, on a whim I changed to 128, and.. boom the file size could get to 127. So I'm thinking it's related to the cache filling up, but I could not for the life of me find a way to solve that, and not a single soul on the internet had the same problem as far as I can tell. The best solution I could find was to split my data into small chunks of 127bytes, but that's gonna be some confusing code for other people to read and will end up a lot more complex than it should be.
.overlay:
&pinctrl {
spi1_default: spi1_default {
group1 {
psels = <NRF_PSEL(SPIM_SCK, 0, 14)>,
<NRF_PSEL(SPIM_MOSI, 0, 13)>,
<NRF_PSEL(SPIM_MISO, 0, 16)>;
};
};
spi1_sleep: spi1_sleep {
group1 {
psels = <NRF_PSEL(SPIM_SCK, 0, 14)>,
<NRF_PSEL(SPIM_MOSI, 0, 13)>,
<NRF_PSEL(SPIM_MISO, 0, 16)>;
low-power-enable;
};
};
}
&spi1 {
compatible = "nordic,nrf-spi";
status = "okay";
cs-gpios = <&gpio0 15 GPIO_ACTIVE_LOW>;
};
/delete-node/ &storage_partition;
/ {
fstab {
compatible = "zephyr,fstab";
lfs1: lfs1 {
compatible = "zephyr,fstab,littlefs";
mount-point = "/lfs1";
partition = <&lfs1_part>;
automount;
read-size = <16>;
prog-size = <16>;
cache-size = <128>;
lookahead-size = <32>;
block-cycles = <512>;
};
};
};
&mx25r16 {
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
lfs1_part: partition@0 {
label = "storage";
reg = <0x00000000 0x1000000>;
};
};
};.dts file for the custom board:
&spi1 {
compatible = "nordic,nrf-spi";
status = "okay";
pinctrl-0 = <&spi1_default>;
pinctrl-1 = <&spi1_sleep>;
pinctrl-names = "default", "sleep";
mx25r16: mx25r1635f@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <8000000>;
jedec-id = [c2 28 15];
size = <DT_SIZE_M(16)>;
};
};
&flash0 {
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 0xc000>;
};
slot0_partition: partition@c000 {
label = "image-0";
reg = <0x0000C000 0x32000>;
};
slot1_partition: partition@3e000 {
label = "image-1";
reg = <0x0003E000 0x32000>;
};
scratch_partition: partition@70000 {
label = "image-scratch";
reg = <0x00070000 0xa000>;
};
storage_partition: partition@7a000 {
label = "storage";
reg = <0x0007a000 0x00006000>;
};
};
};
the file is first created and written a small part on startup with the following code:
bool sirros_writeFile(const char * file_name, char* file_content, size_t file_size, off_t file_pos) {
char caminho_arquivo[MAX_FILE_PATH_LEN];
struct fs_file_t file;
int ret;
size_t written_size = 0;
snprintf(caminho_arquivo, sizeof(caminho_arquivo), "%s%s", mp->mnt_point, file_name);
fs_file_t_init(&file);
ret = fs_open(&file, caminho_arquivo, FS_O_CREATE | FS_O_WRITE);
if(ret < 0)
return false;
if (file_pos != 0)
fs_seek(&file, file_pos, FS_SEEK_SET);
if(file_size == 0)
file_size = strlen(file_content);
written_size = fs_write(&file, file_content, file_size);
ret = fs_close(&file);
return written_size == file_size;
}
.c code for writing the file
bool sirros_appendFile(const char * file_name, char* file_content, size_t file_size) {
char caminho_arquivo[MAX_FILE_PATH_LEN];
struct fs_file_t file;
int ret;
size_t written_size = 0;
snprintf(caminho_arquivo, sizeof(caminho_arquivo), "%s%s", mp->mnt_point, file_name);
fs_file_t_init(&file);
ret = fs_open(&file, caminho_arquivo, FS_O_CREATE | FS_O_APPEND);
if(ret < 0)
return false;
if(file_size == 0)
file_size = strlen(file_content);
ret = fs_sync(&file);
if(ret < 0)
return false;
written_size = fs_write(&file, file_content, file_size);
ret = fs_close(&file);
return written_size == file_size;
}
If anyone knows how to solve the problem, I'd be very grateful.
