// note must be called after you have the mutex - after
// radio max clock freq = 10mhz
// MSP430 max fre clkI cycles - we might be violating this
// SD card -fast frequency ~= 2 MHz
// sound chip - 2s to be 400kHz at first, then bump up speed
void SPIConfigure(uint32 ulBase, uint8 wordSize, uint8 mode, uint32 frequency) {
if ((wordSize != SPIWordSize) || (mode != SPIMode) || (frequency != SPIFrequency)) {
// cache word size value
SPIWordSize = wordSize;
SPIMode = mode;
SPIFrequency = frequency;
MAP_SSIDisable(ulBase);
// Configure the SSI0 port for master mode with all the configuration settings
MAP_SSIConfigSetExpClk(ulBase, SYSCTL_CLOCK_FREQ, SPIMode, SSI_MODE_MASTER, SPIFrequency, SPIWordSize);
// Enable the SSI port.
MAP_SSIEnable(ulBase);
}
}
u32 platform_spi_setup( unsigned id, int mode, u32 clock, unsigned cpol, unsigned cpha, unsigned databits )
{
unsigned protocol;
if( cpol == 0 )
protocol = cpha ? SSI_FRF_MOTO_MODE_1 : SSI_FRF_MOTO_MODE_0;
else
protocol = cpha ? SSI_FRF_MOTO_MODE_3 : SSI_FRF_MOTO_MODE_2;
mode = mode == PLATFORM_SPI_MASTER ? SSI_MODE_MASTER : SSI_MODE_SLAVE;
MAP_SSIDisable( spi_base[ id ] );
MAP_GPIOPinTypeSSI( spi_gpio_base[ id ], spi_gpio_pins[ id ] );
// FIXME: not sure this is always "right"
// MAP_GPIOPadConfigSet(spi_gpio_base[ id ], spi_gpio_clk_pin[ id ], GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD_WPU);
MAP_SSIConfigSetExpClk( spi_base[ id ], MAP_SysCtlClockGet(), protocol, mode, clock, databits );
MAP_SSIEnable( spi_base[ id ] );
return clock;
}
//--------------------------------
void ssi_peripheral::Terminate() {
switch (m_nDevice) {
case ssi_peripheral::SSI0:
g_pTheSSI0 = 0;
break;
case ssi_peripheral::SSI1:
g_pTheSSI1 = 0;
break;
case ssi_peripheral::SSI2:
g_pTheSSI2 = 0;
break;
case ssi_peripheral::SSI3:
g_pTheSSI3 = 0;
break;
default:
break;
}
SSIIntDisable(m_rSpecification.m_nSSIBase, SSI_TXFF); /* SSI_TXFF | SSI_RXFF | SSI_RXTO | SSI_RXOR */
MAP_IntDisable(m_rSpecification.m_nInterrupt);
MAP_SSIDisable(m_rSpecification.m_nSSIBase);
}
