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clear chipselect when turning SPI off. fixes libnds bugs.

This commit is contained in:
StapleButter 2017-12-19 00:20:36 +01:00
parent 3bdb7a7f2d
commit 141e2a7ab0
1 changed files with 12 additions and 0 deletions
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12
src/SPI.cpp
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@ -528,6 +528,18 @@ void Reset()
void WriteCnt(u16 val) void WriteCnt(u16 val)
{ {
// turning it off should clear chipselect
// TODO: confirm on hardware. libnds expects this, though.
if ((Cnt & (1<<15)) && !(val & (1<<15)))
{
switch (Cnt & 0x0300)
{
case 0x0000: SPI_Powerman::Hold = 0; break;
case 0x0100: SPI_Firmware::Hold = 0; break;
case 0x0200: SPI_TSC::DataPos = 0; break;
}
}
Cnt = (Cnt & 0x0080) | (val & 0xCF03); Cnt = (Cnt & 0x0080) | (val & 0xCF03);
if (val & 0x0400) printf("!! CRAPOED 16BIT SPI MODE\n"); if (val & 0x0400) printf("!! CRAPOED 16BIT SPI MODE\n");
if (Cnt & (1<<7)) printf("!! CHANGING SPICNT DURING TRANSFER: %04X\n", val); if (Cnt & (1<<7)) printf("!! CHANGING SPICNT DURING TRANSFER: %04X\n", val);