mirror of https://github.com/rusefi/rusefi.git
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/**
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* @file max31855.c
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* @brief MAX31855 Thermocouple-to-Digital Converter driver
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*
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*
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* http://datasheets.maximintegrated.com/en/ds/MAX31855.pdf
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*
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*
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* Read-only communication over 5MHz SPI
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*
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* @date Sep 17, 2014
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* @author Andrey Belomutskiy, (c) 2012-2014
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*/
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#include "max31855.h"
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#include "pin_repository.h"
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#include "settings.h"
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#include "hardware.h"
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// that's for swap
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#include "tunerstudio_algo.h"
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#if EFI_MAX_31855
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#define EGT_ERROR_VALUE -1000
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static Logging logger;
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static SPIConfig spiConfig[MAX31855_CS_COUNT];
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static void showEgtInfo(board_configuration_s *boardConfiguration) {
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printSpiState(&logger, boardConfiguration);
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scheduleMsg(&logger, "EGT spi: %d", boardConfiguration->max31855spiDevice);
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for (int i = 0; i < MAX31855_CS_COUNT; i++) {
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if (boardConfiguration->max31855_cs[i] != GPIO_UNASSIGNED) {
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scheduleMsg(&logger, "%d ETG @ %s", i, hwPortname(boardConfiguration->max31855_cs[i]));
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}
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}
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}
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// bits D17 and D3 are always expected to be zero
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#define MC_RESERVED_BITS 0x20008
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#define MC_OPEN_BIT 1
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#define MC_GND_BIT 2
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#define MC_VCC_BIT 4
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typedef enum {
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MC_OK = 0, MC_INVALID = 1, MC_OPEN = 2, MC_SHORT_GND = 3, MC_SHORT_VCC = 4,
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} max_32855_code;
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static const char * getMcCode(max_32855_code code) {
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switch (code) {
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case MC_OK:
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return "Ok";
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case MC_OPEN:
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return "Open";
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case MC_SHORT_GND:
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return "short gnd";
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case MC_SHORT_VCC:
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return "short VCC";
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default:
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return "invalid";
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}
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}
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static max_32855_code getResultCode(uint32_t egtPacket) {
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if ((egtPacket & MC_RESERVED_BITS) != 0) {
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return MC_INVALID;
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} else if ((egtPacket & MC_OPEN_BIT) != 0) {
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return MC_OPEN;
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} else if ((egtPacket & MC_GND_BIT) != 0) {
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return MC_SHORT_GND;
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} else if ((egtPacket & MC_VCC_BIT) != 0) {
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return MC_SHORT_VCC;
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} else {
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return MC_OK;
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}
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}
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uint32_t readEgtPacket(board_configuration_s *boardConfiguration, int egtChannel) {
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uint32_t egtPacket;
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SPIDriver *driver = getSpiDevice(boardConfiguration->max31855spiDevice);
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if (driver == NULL) {
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return 0xFFFFFFFF;
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}
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spiStart(driver, &spiConfig[egtChannel]);
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spiSelect(driver);
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spiReceive(driver, 4, &egtPacket);
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spiUnselect(driver);
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spiStop(driver);
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egtPacket = SWAP_UINT32(egtPacket);
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return egtPacket;
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}
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#define GET_TEMPERATURE_C(x) (((x) >> 18) / 4)
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uint16_t getEgtValue(board_configuration_s *boardConfiguration, int egtChannel) {
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uint32_t packet = readEgtPacket(boardConfiguration, egtChannel);
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max_32855_code code = getResultCode(packet);
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if (code != MC_OK) {
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return EGT_ERROR_VALUE + code;
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} else {
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return GET_TEMPERATURE_C(packet);
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}
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}
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static void egtRead(board_configuration_s *boardConfiguration) {
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if (boardConfiguration->max31855spiDevice == SPI_NONE) {
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scheduleMsg(&logger, "No SPI selected for EGT");
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return;
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}
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scheduleMsg(&logger, "Reading egt");
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uint32_t egtPacket = readEgtPacket(boardConfiguration, 0);
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max_32855_code code = getResultCode(egtPacket);
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scheduleMsg(&logger, "egt %x code=%d %s", egtPacket, code, getMcCode(code));
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if (code != MC_INVALID) {
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int refBits = ((egtPacket & 0xFFFF) / 16); // bits 15:4
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float refTemp = refBits / 16.0;
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scheduleMsg(&logger, "reference temperature %f", refTemp);
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scheduleMsg(&logger, "EGT temperature %d", GET_TEMPERATURE_C(egtPacket));
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}
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}
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void initMax31855(board_configuration_s *boardConfiguration) {
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initLogging(&logger, "EGT");
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addConsoleActionP("egtinfo", (VoidPtr) showEgtInfo, boardConfiguration);
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addConsoleActionP("egtread", (VoidPtr) egtRead, boardConfiguration);
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turnOnSpi(SPI_DEVICE_3);
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for (int i = 0; i < MAX31855_CS_COUNT; i++) {
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if (boardConfiguration->max31855_cs[i] != GPIO_UNASSIGNED) {
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initSpiCs(&spiConfig[i], boardConfiguration->max31855_cs[i]);
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spiConfig[i].cr1 = SPI_BaudRatePrescaler_8;
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}
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}
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}
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#endif /* EFI_MAX_31855 */
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