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lib: use struct for metadata

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Streamline this with the host library.
This commit is contained in:
Steve Markgraf 2024-12-26 00:34:56 +01:00
parent d9e7813ccf
commit ae01224d0d
1 changed files with 23 additions and 18 deletions
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41
libpicohsdaoh/picohsdaoh.c
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@ -159,19 +159,23 @@ void hsdaoh_update_head(int head)
static bool hstx_dma_pong = false;
static uint v_scanline = 2;
static bool vactive_cmdlist_posted = false;
static uint16_t framecnt = 0;
uint8_t metadata[] = {
/* 0xda7acab1 magic word for hsdaoh */
0x1, 0xb, 0xa, 0xc, 0xa, 0x7, 0xa, 0xd,
/* u16: placeholder for framecounter */
0, 0, 0, 0,
/* u8: pack_state */
0, 0,
/* u8: crc_config: CRC16 of last line */
1, 0,
enum crc_config {
CRC_NONE, /* No CRC, just 16 bit idle counter */
CRC16_1_LINE, /* Line contains CRC of the last line */
CRC16_2_LINE /* Line contains CRC of the line before the last line */
};
typedef struct
{
uint32_t magic;
uint16_t framecounter;
uint8_t pack_state;
uint8_t crc_config;
} __attribute__((packed, aligned(1))) metadata_t;
metadata_t metadata = (metadata_t) { .magic = 0xda7acab1, .crc_config = CRC16_1_LINE };
/* HSTX DMA IRQ handler, reconfigures the channel that just completed while
* ther other channel is currently busy */
void __scratch_x("") hstx_dma_irq_handler()
@ -191,12 +195,8 @@ void __scratch_x("") hstx_dma_irq_handler()
ch->read_addr = (uintptr_t)info_p;
ch->transfer_count = info_len;
/* update frame counter in metadata */
metadata[8] = framecnt & 0xf;
metadata[9] = (framecnt >> 4) & 0xf;
metadata[10] = (framecnt >> 8) & 0xf;
metadata[11] = (framecnt >> 12) & 0xf;
framecnt++;
/* increment framecounter*/
metadata.framecounter++;
} else {
ch->read_addr = (uintptr_t)vblank_line_vsync_on;
ch->transfer_count = count_of(vblank_line_vsync_on);
@ -227,8 +227,13 @@ void __scratch_x("") hstx_dma_irq_handler()
uint16_t cur_active_line = v_scanline - (MODE_V_TOTAL_LINES - MODE_V_ACTIVE_LINES);
/* fill in metadata word (last word of line) */
if (cur_active_line < sizeof(metadata))
next_line[RBUF_SLICE_LEN - 1] |= (metadata[cur_active_line] << 12);
if (cur_active_line < (sizeof(metadata_t) * 2)) {
uint8_t *met_p = (uint8_t *)&metadata;
if (cur_active_line % 2)
next_line[RBUF_SLICE_LEN - 1] |= ((met_p[cur_active_line/2] & 0xf0) << 8);
else
next_line[RBUF_SLICE_LEN - 1] |= ((met_p[cur_active_line/2] & 0x0f) << 12);
}
/* on the second last word of the line, insert the CRC16 of the entire previous line */
next_line[RBUF_SLICE_LEN - 2] = dma_sniffer_get_data_accumulator() & 0xffff;