http://192.168.253.116:8016/ 2026-07-16T09:23:29+00:00 http://192.168.253.116:8016/ http://192.168.253.116:8016/_media/wiki:dokuwiki.svg text/html 2025-01-22T16:49:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.253.116:8016/public:tech:tm4c123g:fsm?rev=1737564568&do=diff // Linked data structure struct State { unsigned long out; // 2-bit output unsigned long delay; // time to delay in 10ms unsigned long next[4];}; // Next if 2-bit input is 0-3 typedef const struct State StateType; typedef StateType *StatePtr; #define Center 0 #define Left 1 #define Right 2 StateType fsm[3]={ {0x03, 1, { Right, Left, Right, Center }}, // Center {0x02, 1, { Left, Center, Right, Center }}, // Left {0x01, 1, { Right, Left, Center, Center }} // Ri… text/html 2025-01-22T16:49:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.253.116:8016/public:tech:tm4c123g:io_ports?rev=1737564568&do=diff Port Base address PortA 0x40004000 PortB 0x40005000 PortC 0x40006000 PortD 0x40007000 PortE 0x40024000 PortF 0x40025000 If we wish to access bit Constant 7 0x0200 6 0x0100 5 0x0080 4 0x0040 3 0x0020 2 0x0010 1 0x0008 0 text/html 2025-01-22T16:49:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.253.116:8016/public:tech:tm4c123g:pll?rev=1737564568&do=diff Activate the LM4F/TM4C with a 16 MHz crystal to run at 80 MHz void PLL_Init(void){ // 0) Use RCC2 SYSCTL_RCC2_R |= 0x80000000; // USERCC2 // 1) bypass PLL while initializing SYSCTL_RCC2_R |= 0x00000800; // BYPASS2, PLL bypass // 2) select the crystal value and oscillator source SYSCTL_RCC_R = (SYSCTL_RCC_R &~0x000007C0) // clear XTAL field, bits 10-6 + 0x00000540; // 10101, configure for 16 MHz crystal SYSCTL_RCC2_R &= ~0x00000070; // configure for main osci… text/html 2025-01-22T16:49:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.253.116:8016/public:tech:tm4c123g:systick?rev=1737564568&do=diff Initialization of SysTick #define NVIC_ST_CTRL_R (*((volatile unsigned long *)0xE000E010)) #define NVIC_ST_RELOAD_R (*((volatile unsigned long *)0xE000E014)) #define NVIC_ST_CURRENT_R (*((volatile unsigned long *)0xE000E018)) void SysTick_Init(void){ NVIC_ST_CTRL_R = 0; // 1) disable SysTick during setup NVIC_ST_RELOAD_R = 0x00FFFFFF; // 2) maximum reload value NVIC_ST_CURRENT_R = 0; // 3) any write to current clears it NVIC_ST_CTRL_R = 0x00000005; … text/html 2025-01-22T16:49:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.253.116:8016/public:tech:tm4c123g:uart?rev=1737564568&do=diff To activate a UART you will need to turn on the UART clock in the RCGC1 register. You should also turn on the clock for the digital port in the RCGC2 register. You need to enable the transmit and receive pins as digital signals. The alternative function for these pins must also be selected. In particular we set bits in both the AFSEL and PCTL registers.