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I2C overhaul part 2

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This commit is contained in:
RichardG867
2020-11-20 19:23:14 -03:00
parent 886dbe09ea
commit 739fdc46cc
20 changed files with 430 additions and 641 deletions
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62
src/video/vid_ddc.c
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@@ -27,11 +27,6 @@
#include <86box/i2c.h>
typedef struct {
uint8_t addr_register;
} ddc_t;
static uint8_t edid_data[128] = {
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, /* Fixed header pattern */
0x09, 0xf8, /* Manufacturer "BOX" - apparently unassigned by UEFI - and it has to be big endian */
@@ -74,59 +69,20 @@ static uint8_t edid_data[128] = {
};
uint8_t
ddc_read_byte_cmd(void *bus, uint8_t addr, uint8_t cmd, void *priv)
{
return edid_data[cmd & 0x7f];
}
uint8_t
ddc_read_byte(void *bus, uint8_t addr, void *priv)
{
ddc_t *dev = (ddc_t *) priv;
return ddc_read_byte_cmd(bus, addr, dev->addr_register++, priv);
}
uint16_t
ddc_read_word_cmd(void *bus, uint8_t addr, uint8_t cmd, void *priv)
{
return (ddc_read_byte_cmd(bus, addr, cmd + 1, priv) << 8) | ddc_read_byte_cmd(bus, addr, cmd, priv);
}
uint8_t
ddc_read_block_cmd(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv)
{
uint8_t read = 0;
for (uint8_t i = cmd; (i < len) && (i < 0x80); i++)
data[read++] = ddc_read_byte_cmd(bus, addr, i, priv);
return read;
}
void
ddc_write_byte(void *bus, uint8_t addr, uint8_t val, void *priv)
{
ddc_t *dev = (ddc_t *) priv;
dev->addr_register = val;
}
void
void *
ddc_init(void *i2c)
{
ddc_t *dev = (ddc_t *) malloc(sizeof(ddc_t));
memset(dev, 0, sizeof(ddc_t));
uint8_t checksum = 0;
for (int c = 0; c < 127; c++)
checksum += edid_data[c];
edid_data[127] = 256 - checksum;
i2c_sethandler(i2c, 0x50, 1,
NULL, ddc_read_byte, ddc_read_byte_cmd, ddc_read_word_cmd, ddc_read_block_cmd,
NULL, ddc_write_byte, NULL, NULL, NULL,
dev);
return i2c_eeprom_init(i2c, 0x50, edid_data, sizeof(edid_data), 0);
}
void
ddc_close(void *dev_handle)
{
i2c_eeprom_close(dev_handle);
}