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ch376 updates [R. Belmont]

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- Ignore non-8.3 compliant filenames when generating the directory since CH376 is super-tied to FAT12 semantics
- Implement CHECK_EXIST command for BBC Micro
- Implement undocumented command 0x16, also for BBC Micro
- Fix status return from SET_USB_MODE
This commit is contained in:
arbee 2021-05-09 19:35:31 -04:00
parent 2077c7dca0
commit 488e60b3ab
1 changed files with 55 additions and 24 deletions
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35
src/devices/machine/ch376.cpp
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@ -2,10 +2,11 @@
// copyright-holders:R. Belmont
/***************************************************************************
ch376.h
ch376.cpp
"File manage and control chip CH376"
https://www.mpja.com/download/ch376ds1.pdf
https://github.com/djuseeq/Ch376msc/blob/master/src/CommDef.h
This is a module intended to offload USB and USB mass storage
I/O from a small microcontroller or microprocessor.
@ -44,7 +45,11 @@ static constexpr u8 STATUS_USB_INT_DISK_WRITE = 0x1e;
static constexpr u8 STATUS_USB_INT_DISK_ERR = 0x1f;
static constexpr u8 STATUS_ERR_MISS_FILE = 0x42;
// despite the name, this isn't a command
static constexpr u8 CMD_RET_SUCCESS = 0x51;
static constexpr u8 CMD_GET_IC_VER = 0x01;
static constexpr u8 CMD_CHECK_EXIST = 0x06;
static constexpr u8 CMD_GET_FILE_SIZE = 0x0c;
static constexpr u8 CMD_SET_USB_MODE = 0x15;
static constexpr u8 CMD_GET_STATUS = 0x22;
@ -144,8 +149,18 @@ void ch376_device::write(offs_t offset, u8 data)
m_last_command = data;
switch (data)
{
case 0x16: // not a documented valid command, but apparently used by the BBC Micro software
m_dataBuffer[0] = m_int_status = STATUS_USB_INT_CONNECT;
m_dataPtr = 0;
m_dataLen = 1;
break;
case CMD_CHECK_EXIST:
m_state = STATE_CHECK_EXIST;
break;
case CMD_GET_IC_VER:
m_dataBuffer[0] = 0x41; //
m_dataBuffer[0] = 0x41;
m_dataPtr = 0;
m_dataLen = 1;
break;
@ -327,8 +342,17 @@ void ch376_device::write(offs_t offset, u8 data)
{
switch (m_state)
{
case STATE_CHECK_EXIST:
m_data = (data ^ 0xff);
m_state = STATE_IDLE;
break;
case STATE_USB_MODE_SET:
m_state = STATE_IDLE;
if ((data == 0x6) || (data == 0x7))
{
m_data = CMD_RET_SUCCESS;
}
break;
case STATE_SET_FILE_NAME:
@ -440,6 +464,13 @@ bool ch376_device::generateNextDirEntry()
}
}
// is this an 8.3 filename? CH376 can only really cope with 8.3, so
// skip this entry and recurse to get the next one.
if (dotIdx > 8)
{
return generateNextDirEntry();
}
int baseLen = std::min(8, dotIdx);
for (int idx = 0; idx < baseLen; idx++)
{