Other Parts Discussed in Thread: TM4C123GH6PM
Greetings, i have found some code, configuring SSI0 module on PA ports, but i need to change it for SSI1 module on the PF ports of the TM4C123H6PMI launchpad.
SYSCTL_RCGC1_R |= SYSCTL_RCGC1_SSI0; // activate SSI0
SYSCTL_RCGC2_R |= SYSCTL_RCGC2_GPIOA; // activate port A
delay = SYSCTL_RCGC2_R; // allow time to finish activating
GPIO_PORTA_DIR_R |= 0xC0; // make PA6,7 out
GPIO_PORTA_AFSEL_R |= 0x2C; // enable alt funct on PA2,3,5
GPIO_PORTA_AFSEL_R &= ~0xC0; // disable alt funct on PA6,7
GPIO_PORTA_DEN_R |= 0xEC; // enable digital I/O on PA2,3,5,6,7
// configure PA2,3,5 as SSI
GPIO_PORTA_PCTL_R = (GPIO_PORTA_PCTL_R&0xFF0F00FF)+0x00202200;
// configure PA6,7 as GPIO
GPIO_PORTA_PCTL_R = (GPIO_PORTA_PCTL_R&0x00FFFFFF)+0x00000000;
GPIO_PORTA_AMSEL_R &= ~0xEC; // disable analog functionality on PA2,3,5,6,7
SSI0_CR1_R &= ~SSI_CR1_SSE; // disable SSI
SSI0_CR1_R &= ~SSI_CR1_MS; // master mode
// configure for system clock/PLL baud clock source
SSI0_CC_R = (SSI0_CC_R&~SSI_CC_CS_M)+SSI_CC_CS_SYSPLL;
// clock divider for 3.33 MHz SSIClk (80 MHz PLL/24)
// SysClk/(CPSDVSR*(1+SCR))
// 80/(24*(1+0)) = 3.33 MHz (slower than 4 MHz)
SSI0_CPSR_R = (SSI0_CPSR_R&~SSI_CPSR_CPSDVSR_M)+24; // must be even number
SSI0_CR0_R &= ~(SSI_CR0_SCR_M | // SCR = 0 (3.33 Mbps data rate)
SSI_CR0_SPH | // SPH = 0
SSI_CR0_SPO); // SPO = 0
// FRF = Freescale format
SSI0_CR0_R = (SSI0_CR0_R&~SSI_CR0_FRF_M)+SSI_CR0_FRF_MOTO;
// DSS = 8-bit data
SSI0_CR0_R = (SSI0_CR0_R&~SSI_CR0_DSS_M)+SSI_CR0_DSS_8;
SSI0_CR1_R |= SSI_CR1_SSE; // enable SSI
I've seen the datasheet and i can't understand the register thing.
Can i use high level programming like :
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinConfigure(GPIO_PA2_SSI0CLK);
GPIOPinConfigure(GPIO_PA3_SSI0FSS);
GPIOPinConfigure(GPIO_PA4_SSI0RX);
GPIOPinConfigure(GPIO_PA5_SSI0TX);
GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
GPIO_PIN_2);
SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_1,
SSI_MODE_MASTER, SysCtlClockGet()/12, 16);
SSIEnable(SSI0_BASE);
To define all the above?
The first code is from a librarie.
