/* ******************************************** Modul : MAX7219 Routinen zur Ansteuerung des MAX7219 Segment Treibers Autor : Christian Julius 12.2015 ******************************************** */ #include "stm32f4xx.h" #include "stm32f4xx_spi.h" #include "stm32f4xx_rcc.h" #include "stm32f4xx_gpio.h" /* -------------- Standard Include Files ----------------- */ #include #include #include #include /* -------------- Projekt Include Files ---------------- */ #include "max7219.h" /* --------------- Special Include Files / Librarys ------ */ /* -------------- Typen Deklarationen--------------------- */ /* -------------- Defintionen ---------------------------- */ // 7 Segment Anzeige an GPIOE #define SEG7_SPI SPI1 #define SEG7_CS GPIO_Pin_5 #define SEG7_CS_HIGH GPIO_SetBits(GPIOE,SEG7_CS); #define SEG7_CS_LOW GPIO_ResetBits(GPIOE,SEG7_CS); // Hardware Register des Max7219 #define MAX7219_DISPLAY_TEST 0x0F00 #define MAX7219_NORMAL_OP 0x0C01 #define MAX7219_SHUTDOWN 0x0C00 #define MAX7219_INTENSITY 0x0A05 // 0x03 Voreinstellung #define MAX7219_SCAN_LIMIT 0x0B07 // 0x07 = 8 Digits #define MAX7219_DECODE_MODE 0x0900 #define MAX7219_DIGIT_7 0x0800 #define MAX7219_DIGIT_6 0x0700 #define MAX7219_DIGIT_5 0x0600 #define MAX7219_DIGIT_4 0x0500 #define MAX7219_DIGIT_3 0x0400 #define MAX7219_DIGIT_2 0x0300 #define MAX7219_DIGIT_1 0x0200 #define MAX7219_DIGIT_0 0x0100 #define MAX7219_DIGIT_BASE 0x0100 /* -------------- Privat Global Variablen ---------------- */ /* -------------- Privat Funktionen Prototypen ----------- */ static void MAX7219_SendWord(uint16_t data); /* -------------- Funktionen ----------- */ /* Init des 7 Segment Treibers auf SPI 1, zusammen mit dem NRF24L01 */ void __attribute__((optimize(0))) MAX7219_Init_SPI() { GPIO_InitTypeDef GPIO_InitStruct; SPI_InitTypeDef SPI_InitStruct; // PE5 = Chip Select, PA7 = MOSI, PA6 = MISO (nicht verwendet!), PA5 = SCK RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); /*-------- Configuring SCK, MISO, MOSI --------*/ GPIO_StructInit (&GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Medium_Speed; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); /* ----- PE5 als CS konfigurieren -------- */ GPIO_SetBits(GPIOE,SEG7_CS); // Glitch vermeiden CS = HIGH (DISABLE) GPIO_StructInit (&GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = SEG7_CS; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStruct.GPIO_Speed = GPIO_Medium_Speed; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOE, &GPIO_InitStruct); /* SPI1 die Alternate Pins zuordnen */ GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1); /* Die SPI1 einstellen */ SPI_StructInit(&SPI_InitStruct); SPI_InitStruct.SPI_Direction = SPI_Direction_Tx; SPI_InitStruct.SPI_Mode = SPI_Mode_Master; SPI_InitStruct.SPI_DataSize = SPI_DataSize_16b; SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low; SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge; SPI_InitStruct.SPI_NSS = SPI_NSS_Soft; SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; SPI_Init(SPI1, &SPI_InitStruct); SPI_Cmd(SPI1, ENABLE); return; } // Grundeinstellung des Max7219 void MAX7219_Init() { /* Den MAX 7219 adressieren und einstellen */ MAX7219_SendWord(MAX7219_NORMAL_OP); MAX7219_SendWord(MAX7219_SCAN_LIMIT); MAX7219_SendWord(MAX7219_INTENSITY); MAX7219_ClearAllDigits(); } /* -------------------------------------------------------------- Schreibt eine vorzeichenbehaftete 32 Bit Integerzahl ins Display. Eingabe: digit: Stelle, (links 7 rechts 0) Zahl : -32768 ... +32768 dp : Punkt bei Digit n, 0xff = kein Punkt ------------------------------------------------------------- */ void MAX7219_PrintInteger(uint8_t stelle, int32_t zahl, uint8_t dp_stelle) { uint8_t negativ = (zahl < 0); // Vorzeichen merken // zahl = 0? Dann nur 0 eintragen und raus if (zahl == 0) { MAX7219_SetDigit(stelle,'0',false); return; } /* --- Zerlege die Zahl in BCD Ziffern -----*/ zahl = abs(zahl); // Vorzeichen killen int32_t rest; uint16_t i = 0; do { rest = zahl % 10; zahl /= 10; MAX7219_SetDigit(stelle++,'0' + rest,(dp_stelle != i++) ? 0:1); if (stelle > 7) return; } while (zahl > 0); // Vorzeichen zuletzt eintragen if (negativ) MAX7219_SetDigit(stelle,'-',false); return; } /* ------ Ein 16 Bit Datenwort senden ------- */ static void __attribute__((optimize(0))) MAX7219_SendWord(uint16_t data) { SEG7_CS_LOW; while(!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)); SPI_I2S_SendData(SPI1, data); while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY)); SEG7_CS_HIGH; } /* ------ Display löschen ------- */ void MAX7219_ClearAllDigits() { for (uint16_t i = 0; i < 8; i ++) MAX7219_SendWord(MAX7219_DIGIT_BASE + (i << 8)); } /* ----------------------------------------------------------------------------------------------- Setzt ein Digit, Eingabe = ASCii Zeichen ------------------------------------------------------------------------------------------------- */ /* 0,1,2,3,4,5,6,7,8,9 */ const uint8_t const digit_code[] = {0x7e, 0x30, 0x6d, 0x79, 0x33, 0x5b, 0x5f, 0x70, 0x7f, 0x7b}; /* a,b,c,d,e,f,-,h,H,I,L,N,o,O,P */ const uint8_t const char_code[] = {0x77, 0x1f, 0x4e, 0x3d, 0x4f, 0x47, 0x01,0x17,0x37,0x06, \ 0x0e,0x15,0x1d,0x67,0x1c,0x3e}; void MAX7219_SetDigit(uint8_t digit, uint8_t value, _Bool dp) { uint16_t chr; if ((value >= '0') && (value <= '9')) { // Es ist eine Zahl zwischen 0 und 9 uint16_t offs = digit_code[value - '0']; // Punkt einmaskieren if (dp) offs |= 0x80; // Zeichen drucken MAX7219_SendWord(MAX7219_DIGIT_BASE + (digit << 8) + offs); } else { // Es ist ein Sonderzeichen uint16_t adr = MAX7219_DIGIT_BASE + (digit << 8); uint16_t offs; switch (value) { case 'a': case 'A': offs = char_code[0]; break; case 'b': case 'B': offs = char_code[1]; break; case 'c': case 'C': offs = char_code[2]; break; case 'd': case 'D': offs = char_code[3]; break; case 'e': case 'E': offs = char_code[4]; break; case 'f': case 'F': offs = char_code[5]; break; case 'h': offs = char_code[7]; break; case 'H': offs = char_code[8]; break; case 'i': case 'I': offs = char_code[9]; break; case 'l': case 'L': offs = char_code[10]; break; case 'N': case 'n': offs = char_code[11]; break; case 'o': offs = char_code[12]; break; case 'O': offs = digit_code[0]; break; case 'p': case 'P': offs = char_code[13]; break; case 's': case 'S': offs = digit_code[5]; break; case 'u': offs = char_code[14]; break; case 'U': offs = char_code[15]; break; case '-': offs = char_code[6]; break; default: offs = char_code[6]; break; } // Punkt nicht vergessen if (dp) offs |= 0x80; // Eintragen ins Display MAX7219_SendWord(adr + offs); } }