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This commit is contained in:
411
RTOS_Labs_common/TFLuna3.c
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411
RTOS_Labs_common/TFLuna3.c
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/* TFLuna3.c
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* Jonathan Valvano
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* Date: 10/23/2025
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TF Luna TOF distance sensor
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*/
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#include <ti/devices/msp/msp.h>
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#include "../RTOS_Labs_common/TFLuna3.h"
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#include "../inc/Clock.h"
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#include "../inc/LaunchPad.h"
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// There are four possible sets of UART3 pins that can be used
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// Select the TFLuna3_RX/TFLuna3_TX for the UART3 pins to use
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// overhead of TFLuna will be 17us/measurement at 100 measurements/sec
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// UART3 is shared between LD19 and TFLuna3 (can have either but not both)
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// SJ-PM-TF-Luna+A01 on RTOS sensor board
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// Pin
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// 1 Red 5V
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// 2 Serial TxD: PB12 is UART3 Tx (MSPM0 to TFLuna3)
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// 3 Serial RxD: PB13 is UART3 Rx (TFLuna3 to MSPM0)
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// 4 black ground
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#define TFLUNA3_RX PB13INDEX
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#define TFLUNA3_TX PB12INDEX
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// Can use PA13 and PA14, but different PINCH values
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// SJ-PM-TF-Luna+A01
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// Pin
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// 1 Red 5V
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// 2 Serial TxD: PA26 is UART3 Tx (MSPM0 to TFLuna3)
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// 3 Serial RxD: PA25 is UART3 Rx (TFLuna3 to MSPM0)
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// 4 black ground
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//#define TFLUNA3_RX PA25INDEX
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//#define TFLUNA3_TX PA26INDEX
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// SJ-PM-TF-Luna+A01
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// Pin
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// 1 Red 5V
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// 2 Serial TxD: PB2 is UART3 Tx (MSPM0 to TFLuna3)
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// 3 Serial RxD: PB3 is UART3 Rx (TFLuna3 to MSPM0)
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// 4 black ground
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//#define TFLUNA3_RX PB3INDEX
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//#define TFLUNA3_TX PB2INDEX
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uint32_t LostData3;
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#define FIFO3_SIZE 16 // usable size is 15
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// prototypes for private functions
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void Tx3Fifo_Init(void);
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uint32_t Tx3Fifo_Put(uint8_t data);
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uint32_t Tx3Fifo_Get(uint8_t *datapt);
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void Rx3Fifo_Init(void);
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uint32_t Rx3Fifo_Put(uint8_t data);
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uint32_t Rx3Fifo_Get(uint8_t *datapt);
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int TFLuna3Index;
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// 0 for looking for two 59s
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// 2-8 filling the TFLunaDataMessage with 9-byte message
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void (*TFLuna3Function)(uint32_t); // data in mm
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uint8_t TFLuna3LastByte;
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uint32_t TFLuna3Distance; // in mm
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uint8_t TFLuna3DataMessage[12]; // 9 byte fixed size message
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int BadCheckSum3; // errors
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// defined in TFLunaCommon
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extern const uint8_t ObtainFirmware[4];
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// expected response is 0x5A,0x07,0x01,a,b,c,SU version c.b.a
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extern const uint8_t System_Reset[4];
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// expected response is 0x5A,0x05,0x02,0x00, 0x60 for success
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// expected response is 0x5A,0x05,0x02,0x01, 0x61 for failed
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extern const uint8_t Frame_Rate[6];
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extern const uint8_t Trigger[4];
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extern const uint8_t Format_Standard_cm[5];
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extern const uint8_t Format_Pixhawk[5];
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extern const uint8_t Format_Standard_mm[5];
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extern const uint8_t Output_Enable[5];
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extern const uint8_t Output_Disable[5];
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extern const uint8_t SaveSettings[4];
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// power Domain PD1
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// for 32MHz bus clock, UART clock is 32MHz
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// for 40MHz bus clock, UART clock is MCLK 40MHz
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// for 80MHz bus clock, UART clock is MCLK 80MHz
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//------------TFLuna_Init------------
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// Initialize the UART3 for 115,200 baud rate (assuming 80 MHz clock),
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// 8 bit word length, no parity bits, one stop bit, FIFOs enabled
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// Input: function 0 for debug, user function for real time
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// Output: none
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void TFLuna3_Init(void (*function)(uint32_t)){
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// do not reset or activate PortA, already done in LaunchPad_Init
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// RSTCLR to GPIOA and UART3 peripherals
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// bits 31-24 unlock key 0xB1
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// bit 1 is Clear reset sticky bit
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// bit 0 is reset gpio port
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// GPIOA->GPRCM.RSTCTL = (uint32_t)0xB1000003; // called previously
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UART3->GPRCM.RSTCTL = 0xB1000003;
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// Enable power to GPIOA and UART3 peripherals
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// PWREN
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// bits 31-24 unlock key 0x26
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// bit 0 is Enable Power
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// GPIOA->GPRCM.PWREN = (uint32_t)0x26000001; // called previously
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UART3->GPRCM.PWREN = 0x26000001;
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Clock_Delay(24); // time for uart to power up
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// the following code selects which pins to use
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IOMUX->SECCFG.PINCM[TFLUNA3_RX] = 0x00040082;
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//bit 18 INENA input enable
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//bit 7 PC connected
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//bits 5-0=2 for UART3_Rx
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// configure alternate UART3 transmit function
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IOMUX->SECCFG.PINCM[TFLUNA3_TX] = 0x00000082;
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//bit 7 PC connected
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//bits 5-0=2 for UART3_Tx
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UART3->CLKSEL = 0x08; // bus clock
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UART3->CLKDIV = 0x00; // no divide
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UART3->CTL0 &= ~0x01; // disable UART3
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UART3->CTL0 = 0x00020018;
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// bit 17 FEN=1 enable FIFO
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// bits 16-15 HSE=00 16x oversampling
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// bit 14 CTSEN=0 no CTS hardware
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// bit 13 RTSEN=0 no RTS hardware
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// bit 12 RTS=0 not RTS
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// bits 10-8 MODE=000 normal
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// bits 6-4 TXE=001 enable TxD
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// bit 3 RXE=1 enable TxD
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// bit 2 LBE=0 no loop back
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// bit 0 ENABLE 0 is disable, 1 to enable
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if(Clock_Freq() == 40000000){
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// 40000000/16 = 2,500,000 Hz
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// Baud = 115200
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// 2,500,000/115200 = 21.701388888
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// divider = 21+45/64 = 21.703125
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UART3->IBRD = 21;
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UART3->FBRD = 45; // baud =2,500,000/10.84375 = 115,273.77
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}else if (Clock_Freq() == 32000000){
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// 32000000/16 = 2,000,000
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// Baud = 115200
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// 2,000,000/115200 = 17.3611111
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// divider = 21+23/64 = 17.359375
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UART3->IBRD = 17;
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UART3->FBRD = 23; // 115,211.52
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}else if (Clock_Freq() == 80000000){
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// 80000000/16 = 5,000,000 Hz
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// Baud = 115200
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// 5,000,000/115200 = 43.4027777
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// divider = 43+26/64 = 43.40625
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UART3->IBRD = 43;
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UART3->FBRD = 26; // baud =5,000,000/43.40625 = 115,190.78
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}else return;
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TFLuna3Function = function;
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TFLuna3Index = 0; // looking for two 59s
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TFLuna3LastByte = 0;
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TFLuna3DataMessage[0] = 0x59;
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TFLuna3DataMessage[1] = 0x59;
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BadCheckSum3 = 0;
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Tx3Fifo_Init();
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Rx3Fifo_Init();
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LostData3 = 0;
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UART3->LCRH = 0x00000030;
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// bits 5-4 WLEN=11 8 bits
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// bit 3 STP2=0 1 stop
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// bit 2 EPS=0 parity select
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// bit 1 PEN=0 no parity
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// bit 0 BRK=0 no break
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UART3->CPU_INT.IMASK = 0x0C01;
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// bit 11 TXINT
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// bit 10 RXINT yes
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// bit 0 Receive timeout, yes
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UART3->IFLS = 0x0422;
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// bits 11-8 RXTOSEL receiver timeout select 4 (0xF highest)
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// bits 6-4 RXIFLSEL 2 is greater than or equal to half
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// bits 2-0 TXIFLSEL 2 is less than or equal to half
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NVIC->ICPR[0] = 1<<3; // UART3 is IRQ 3
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NVIC->ISER[0] = 1<<3;
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NVIC->IP[0] = (NVIC->IP[0]&(~0xFF000000))|(1<<30); // set priority (bits 31-30) IRQ 3
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UART3->CTL0 |= 0x01; // enable UART3
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}
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// copy from hardware RX FIFO to software RX FIFO
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// stop when hardware RX FIFO is empty or software RX FIFO is full
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void static copyHardwareToSoftware3(void){
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uint8_t letter;
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if(TFLuna3Function==0){ // raw data mode
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while(((UART3->STAT&0x04) == 0)&&(TFLuna3_InStatus() < (FIFO3_SIZE - 1))){
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letter = UART3->RXDATA;
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Rx3Fifo_Put(letter);
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}
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}else{
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while((UART3->STAT&0x04)==0){
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letter = UART3->RXDATA;
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if(TFLuna3Index == 0){
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if((letter == 0x59)&&(TFLuna3LastByte == 0x59)){
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TFLuna3Index = 2; // looking for message
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}
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TFLuna3LastByte = letter;
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}else{
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TFLuna3DataMessage[TFLuna3Index] = letter;
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TFLuna3Index++;
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if(TFLuna3Index == 9){
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TFLuna3LastByte = 0; // get ready for next message
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TFLuna3Index = 0;
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uint8_t check=0;
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for(int i=0;i<8;i++){
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check += TFLuna3DataMessage[i];
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}
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if(check == TFLuna3DataMessage[8]){
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TFLuna3Distance = TFLuna3DataMessage[3]*256+TFLuna3DataMessage[2];
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// call back
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(*TFLuna3Function)(TFLuna3Distance); // pass distance back to higher level
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}else{
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BadCheckSum3++; // error
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}
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}
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}
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}
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}
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}
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//------------TFLuna3_InChar------------
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// Wait for new serial port input
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// Input: none
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// Output: ASCII code for key typed
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uint8_t TFLuna3_InChar(void){uint32_t status;
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uint8_t letter;
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do{
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status = Rx3Fifo_Get(&letter);
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}while(status==0);
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return(letter);
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}
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// copy from software TX FIFO to hardware TX FIFO
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// stop when software TX FIFO is empty or hardware TX FIFO is full
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void static copySoftwareToHardware3(void){
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uint8_t letter;
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while(((UART3->STAT&0x80) == 0) && (TFLuna3_OutStatus() > 0)){
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Tx3Fifo_Get(&letter);
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UART3->TXDATA = letter;
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}
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}
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//------------UART3_OutChar------------
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// Output 8-bit to serial port
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// Input: letter is an 8-bit ASCII character to be transferred
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// Output: none
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void TFLuna3_OutChar(uint8_t data){
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while(Tx3Fifo_Put(data) == 0){};
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UART3->CPU_INT.IMASK &= ~0x0800; // disarm TX FIFO interrupt
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copySoftwareToHardware3();
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UART3->CPU_INT.IMASK |= 0x0800; // rearm TX FIFO interrupt
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}
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//------------TFLuna_OutString------------
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// Output String (NULL termination)
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// Input: pointer to a NULL-terminated string to be transferred
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// Output: none
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void TFLuna3_OutString(uint8_t *pt){
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while(*pt){
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TFLuna3_OutChar(*pt);
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pt++;
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}
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}
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//------------TFLuna3_SendMessage------------
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// Output message, msg[1] is length
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// Input: pointer to message to be transferred
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// Output: none
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void TFLuna3_SendMessage(const uint8_t msg[]){
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for(int i=0; i<msg[1]; i++){
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TFLuna3_OutChar(msg[i]);
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}
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}
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void TFLuna3_Format_Standard_mm(void){
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TFLuna3_SendMessage(Format_Standard_mm);
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}
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void TFLuna3_Format_Standard_cm(void){
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TFLuna3_SendMessage(Format_Standard_cm);
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}
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void TFLuna3_Format_Pixhawk(void){
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TFLuna3_SendMessage(Format_Pixhawk);
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}
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void TFLuna3_Output_Enable(void){
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TFLuna3_SendMessage(Output_Enable);
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}
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void TFLuna3_Output_Disable(void){
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TFLuna3_SendMessage(Output_Disable);
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}
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void TFLuna3_Frame_Rate(void){
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TFLuna3_SendMessage(Frame_Rate);
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}
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void TFLuna3_SaveSettings(void){
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TFLuna3_SendMessage(SaveSettings);
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}
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void TFLuna3_System_Reset(void){
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TFLuna3_SendMessage(System_Reset);
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}
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void UART3_IRQHandler(void){ uint32_t status;
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status = UART3->CPU_INT.IIDX; // reading clears bit in RIS
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if(status == 0x01){ // 0x01 receive timeout
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copyHardwareToSoftware3();
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}else if(status == 0x0B){ // 0x0B receive
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copyHardwareToSoftware3();
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}else if(status == 0x0C){ // 0x0C transmit
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copySoftwareToHardware3();
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if(TFLuna3_OutStatus() == 0){ // software TX FIFO is empty
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UART3->CPU_INT.IMASK &= ~0x0800; // disable TX FIFO interrupt
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}
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}
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}
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// Declare state variables for FiFo
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// size, buffer, put and get indexes
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int32_t static Tx3PutI; // Index to put new
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int32_t static Tx3GetI; // Index of oldest
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uint8_t static Tx3Fifo[FIFO3_SIZE];
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// *********** Tx3Fifo_Init**********
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// Initializes a software Tx3FIFO of a
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// fixed size and sets up indexes for
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// put and get operations
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void Tx3Fifo_Init(void){
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Tx3PutI = Tx3GetI = 0;
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}
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// *********** Tx3Fifo_Put**********
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// Adds an element to the Tx3FIFO
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// Input: data is character to be inserted
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// Output: 1 for success, data properly saved
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// 0 for failure, TxFIFO is full
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uint32_t Tx3Fifo_Put(uint8_t data){
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if(((Tx3PutI+1)&(FIFO3_SIZE-1)) == Tx3GetI){
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return 0;
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}
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Tx3Fifo[Tx3PutI] = data;
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Tx3PutI = (Tx3PutI+1)&(FIFO3_SIZE-1);
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return 1; // success
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}
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// *********** Tx3Fifo_Get**********
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// Gets an element from the Tx3FIFO
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// Input: pointer to empty 8-bit variable
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// Output: If the Tx3FIFO is empty return 0
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// If the Tx3FIFO has data, remove it, and put in *datapt, return 1
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uint32_t Tx3Fifo_Get(uint8_t *datapt){
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if(Tx3GetI == Tx3PutI){
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return 0;
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}
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*datapt = Tx3Fifo[Tx3GetI];
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Tx3GetI = (Tx3GetI+1)&(FIFO3_SIZE-1);
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return 1; // success
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}
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//------------TFLuna3_OutStatus------------
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// Returns how much data available for reading from Tx3 FIFO
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// Input: none
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// Output: number of elements in receive FIFO
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uint32_t TFLuna3_OutStatus(void){
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return ((Tx3PutI - Tx3GetI)&(FIFO3_SIZE-1));
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}
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int32_t static Rx3PutI; // Index to put new
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int32_t static Rx3GetI; // Index of oldest
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uint8_t static Rx3Fifo[FIFO3_SIZE];
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// *********** Rx3Fifo_Init**********
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// Initializes a software RxFIFO of a
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// fixed size and sets up indexes for
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// put and get operations
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void Rx3Fifo_Init(void){
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Rx3PutI = Rx3GetI = 0;
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}
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// *********** Rx3Fifo_Put**********
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// Adds an element to the Rx3FIFO
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// Input: data is character to be inserted
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// Output: 1 for success, data properly saved
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// 0 for failure, RxFIFO is full
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uint32_t Rx3Fifo_Put(uint8_t data){
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if(((Rx3PutI+1)&(FIFO3_SIZE-1)) == Rx3GetI){
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return 0;
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}
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Rx3Fifo[Rx3PutI] = data;
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Rx3PutI = (Rx3PutI+1)&(FIFO3_SIZE-1);
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return 1;
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}
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// *********** Rx3Fifo_Get**********
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// Gets an element from the Rx3FIFO
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// Input: pointer to empty 8-bit variable
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// Output: If the Rx3FIFO is empty return 0
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// If the Rx3FIFO has data, remove it, and put in *datapt, return 1
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uint32_t Rx3Fifo_Get(uint8_t *datapt){
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if(Rx3GetI == Rx3PutI){
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return 0;
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}
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*datapt = Rx3Fifo[Rx3GetI];
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Rx3GetI = (Rx3GetI+1)&(FIFO3_SIZE-1);
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return 1;
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}
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//------------TFLuna3_InStatus------------
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// Returns how much data available for reading from Rx3 FIFO
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// Input: none
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// Output: number of elements in receive FIFO
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uint32_t TFLuna3_InStatus(void){
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return ((Rx3PutI - Rx3GetI)&(FIFO3_SIZE-1));
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}
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