Dear all,
Even if this post is related to TM4C the corresponding forum is not selectable. When choosing part starting with TM4C (doesn't matter which one), TM4C forum is removed from the list and LPW forums are presented.
please help with the following issue:
A third party module is used as SPI master.
Module Configuration: Mode: command word length is 1, data width is 8bit, mode 0 (rising edge trigger, active low), clock frequency 3M.
Transmit data waveform: Send data 1,0,0,0
This is connected to TM4C129x device configured as slave. The clock is configured as following:
ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480), 120000000)
Calcluation: SSInClk = SysClk / (CPSDVSR * (1 + SCR)) = 120M / (2 * (1 + 19)) = 120M / 40 = 3M
Afterwards the SSI is initialized:
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); GPIOPinConfigure(GPIO_PA2_SSI0CLK); GPIOPinConfigure(GPIO_PA3_SSI0FSS); GPIOPinConfigure(GPIO_PA4_SSI0XDAT0); GPIOPinConfigure(GPIO_PA5_SSI0XDAT1); GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | GPIO_PIN_2); SSIConfigSetExpClk(SSI0_BASE, ui32SysClock, SSI_FRF_MOTO_MODE_0, SSI_MODE_SLAVE, 3000000, 8); SSIEnable(SSI0_BASE);
The SSI is polled with
SSIDataGet(SSI0_BASE, &data);
No data is received.
Can you help here?
