Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

chihiro.cpp: description of 2 commands sent via usb to the an2131qc chip, based on disassembly of its firmware (nw)

Browse Source 
They are used to read the i2c eeproms connected to the chip.
This commit is contained in:
yz70s 2016-06-13 20:46:10 +02:00
parent 17bab2614e
commit e62c3ef137
1 changed files with 18 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/mame/drivers/chihiro.cpp
View File

@ -729,24 +729,30 @@ int ohci_hlean2131qc_device::handle_nonstandard_request(int endpoint, USBSetupPa
{
if (endpoint != 0)
return -1;
printf("Control request: %x %x %x %x %x %x %x\n\r", endpoint, endpoints[endpoint].controldirection, setup->bmRequestType, setup->bRequest, setup->wValue, setup->wIndex, setup->wLength);
printf("Control request to an2131qc: %x %x %x %x %x %x %x\n\r", endpoint, endpoints[endpoint].controldirection, setup->bmRequestType, setup->bRequest, setup->wValue, setup->wIndex, setup->wLength);
// default valuse for data stage
for (int n = 0; n < setup->wLength; n++)
endpoints[endpoint].buffer[n] = 0x50 ^ n;
endpoints[endpoint].buffer[1] = 0x4b; // bits 4-1 special value, must be 10 xor 15
// bRequest is a command value
if (setup->bRequest == 0x16)
{
// this command is used to read data from the first i2c serial eeprom connected to the chip
// setup->wValue = start address to read from
// setup->wIndex = number of bytes to read
// data will be transferred to the host using endpoint 1 (IN)
endpoints[1].remain = setup->wIndex & 255;
endpoints[1].position = region + setup->wValue; // usually wValue is 0x1f00
}
if (setup->bRequest == 0x17)
{
maximum_send = setup->wIndex;
if (maximum_send > 0x40)
maximum_send = 0x40;
endpoints[2].remain = maximum_send;
// this command is used to read data from the second i2c serial eeprom connected to the chip
// setup->wValue = start address to read from
// setup->wIndex = number of bytes to read
// data will be transferred to the host using endpoint 2 (IN)
endpoints[2].remain = setup->wIndex & 255;
endpoints[2].position = region + 0x2000 + setup->wValue;
}
if ((setup->bRequest == 0x16) && (setup->wValue == 0x1f00))
{
// should be for an2131sc
endpoints[1].remain = setup->wIndex;
endpoints[1].position = region + 0x1f00;
}
if (setup->bRequest == 0x19) // 19 used to receive packet, 20 to send ?
{
// amount to transfer
@ -833,6 +839,7 @@ int ohci_hlean2131sc_device::handle_nonstandard_request(int endpoint, USBSetupPa
{
if (endpoint != 0)
return -1;
printf("Control request to an2131sc: %x %x %x %x %x %x %x\n\r", endpoint, endpoints[endpoint].controldirection, setup->bmRequestType, setup->bRequest, setup->wValue, setup->wIndex, setup->wLength);
for (int n = 0; n < setup->wLength; n++)
endpoints[endpoint].buffer[n] = 0xa0 ^ n;
endpoints[endpoint].position = endpoints[endpoint].buffer;