/** Read block from file located on a FAT file system.
*
* @param block Pointer to a block pointer for storing result.
* @param bs Buffer holding the boot sector of the file system.
* @param service_id Service ID handle of the file system.
* @param fcl First cluster used by the file. Can be zero if the file
* is empty.
* @param clp If not NULL, address where the cluster containing bn
* will be stored.
* stored
* @param bn Block number.
* @param flags Flags passed to libblock.
*
* @return EOK on success or a negative error code.
*/
int
_fat_block_get(block_t **block, fat_bs_t *bs, service_id_t service_id,
fat_cluster_t fcl, fat_cluster_t *clp, aoff64_t bn, int flags)
{
uint32_t clusters;
uint32_t max_clusters;
fat_cluster_t c;
int rc;
/*
* This function can only operate on non-zero length files.
*/
if (fcl == FAT_CLST_RES0)
return ELIMIT;
if (!FAT_IS_FAT32(bs) && fcl == FAT_CLST_ROOT) {
/* root directory special case */
assert(bn < RDS(bs));
rc = block_get(block, service_id,
RSCNT(bs) + FATCNT(bs) * SF(bs) + bn, flags);
return rc;
}
max_clusters = bn / SPC(bs);
rc = fat_cluster_walk(bs, service_id, fcl, &c, &clusters, max_clusters);
if (rc != EOK)
return rc;
assert(clusters == max_clusters);
rc = block_get(block, service_id, CLBN2PBN(bs, c, bn), flags);
if (clp)
*clp = c;
return rc;
}
/* FM antenna test
* Tune FM radio to 107.9 MHz
* Bring ULX3S within 1 m distance of radio antenna
* You should hear silence.
* RDS display should show: "TEST1234"
* RDS long message (optional on some radios): "@ABCDEFGHIJ.."
*/
#include <RDS.h>
RDS rds = RDS();
uint16_t pi = 0xCAFE;
char ps[9] = "TEST1234";
char rt[65] = "ABCDEFGH";
void rds_init() {
int i;
for(i = 0; i < sizeof(rt)-1; i++)
rt[i] = '@'+i; // ascii map
/* Setup initial RDS text */
rds.pi(pi); // station numeric ID
rds.stereo(0); // 0-Inform over RDS that we send Mono, 1-Stereo
rds.ta(0); // 0-No, 1-Traffice Announcements
rds.ps(ps); // 8-char text, displayed as station name
rds.rt(rt); // 64-char text, not every radio displays it
rds.Hz(107900000); // Hz carrier wave frequency
rds.length(260); // bytes message length (260 default)
}