2424#include <espmissingincludes.h>
2525#include <uart.h>
2626#include <i2c_master.h>
27+ #include <spi.h> // Include the MetalPhreak/ESP8266_SPI_Library headers.
2728
2829//#define FAKE_STDLIB
2930#define _GCC_WRAP_STDINT_H
@@ -53,6 +54,10 @@ typedef long long int64_t;
5354// Address in RTC RAM where we save the time
5455#define RTC_TIME_ADDR (256/4) // start of "user data" in RTC RAM
5556
57+
58+ static bool g_spiInitialized = false;
59+ static int g_lastSPIRead = -1 ;
60+
5661/**
5762 * Transmit all the characters in the transmit buffer.
5863 *
@@ -159,6 +164,8 @@ void jshReset() {
159164 jshPinSetState(i, JSHPINSTATE_GPIO_IN);
160165 }
161166 */
167+ g_spiInitialized = false; // Flag the hardware SPI interface as un-initialized.
168+ g_lastSPIRead = -1 ;
162169 os_printf ("< jshReset\n" );
163170} // End of jshReset
164171
@@ -588,26 +595,69 @@ void jshUSARTKick(
588595//===== SPI =====
589596
590597/**
591- * Unknown
598+ * Initialize the hardware SPI device.
599+ * On the ESP8266, hardware SPI is implemented via a set of pins defined
600+ * as follows:
592601 *
602+ * | GPIO | NodeMCU | Name | Function |
603+ * |--------|---------|-------|----------|
604+ * | GPIO12 | D6 | HMISO | MISO |
605+ * | GPIO13 | D7 | HMOSI | MOSI |
606+ * | GPIO14 | D5 | HSCLK | CLK |
607+ * | GPIO15 | D8 | HCS | CS |
593608 *
594609 */
595610void jshSPISetup (
596- IOEventFlags device , //!< Unknown
597- JshSPIInfo * inf //!< Unknown
611+ IOEventFlags device , //!< The identity of the SPI device being initialized.
612+ JshSPIInfo * inf //!< Flags for the SPI device.
598613 ) {
599- os_printf ("ESP8266: jshSPISetup: device=%d, inf=0x%x\n" , device , (int )inf );
614+ // The device should be one of EV_SPI1, EV_SPI2 or EV_SPI3.
615+ os_printf ("> jshSPISetup - jshSPISetup: device=%d\n" , device );
616+ switch (device ) {
617+ case EV_SPI1 :
618+ os_printf (" - Device is SPI1\n" );
619+ // EV_SPI1 is the ESP8266 hardware SPI ...
620+ spi_init (HSPI ); // Initialize the hardware SPI components.
621+ spi_clock (HSPI , CPU_CLK_FREQ / (inf -> baudRate * 2 ), 2 );
622+ g_spiInitialized = true;
623+ g_lastSPIRead = -1 ;
624+ break ;
625+ case EV_SPI2 :
626+ os_printf (" - Device is SPI2\n" );
627+ break ;
628+ case EV_SPI3 :
629+ os_printf (" - Device is SPI3\n" );
630+ break ;
631+ default :
632+ os_printf (" - Device is Unknown!!\n" );
633+ break ;
634+ }
635+ if (inf != NULL ) {
636+ os_printf ("baudRate=%d, baudRateSpec=%d, pinSCK=%d, pinMISO=%d, pinMOSI=%d, spiMode=%d, spiMSB=%d\n" ,
637+ inf -> baudRate , inf -> baudRateSpec , inf -> pinSCK , inf -> pinMISO , inf -> pinMOSI , inf -> spiMode , inf -> spiMSB );
638+ }
639+ os_printf ("< jshSPISetup\n" );
600640}
601641
602642/** Send data through the given SPI device (if data>=0), and return the result
603643 * of the previous send (or -1). If data<0, no data is sent and the function
604644 * waits for data to be returned */
605645int jshSPISend (
606- IOEventFlags device , //!< Unknown
607- int data //!< Unknown
646+ IOEventFlags device , //!< The identity of the SPI device through which data is being sent.
647+ int data //!< The data to be sent or an indication that no data is to be sent.
608648 ) {
609- os_printf ("ESP8266: jshSPISend\n" );
610- return NAN ;
649+ if (device != EV_SPI1 ) {
650+ return -1 ;
651+ }
652+ //os_printf("> jshSPISend - device=%d, data=%x\n", device, data);
653+ int retData = g_lastSPIRead ;
654+ if (data >=0 ) {
655+ g_lastSPIRead = spi_tx8 (HSPI , data );
656+ } else {
657+ g_lastSPIRead = -1 ;
658+ }
659+ //os_printf("< jshSPISend\n");
660+ return retData ;
611661}
612662
613663
@@ -618,9 +668,15 @@ void jshSPISend16(
618668 IOEventFlags device , //!< Unknown
619669 int data //!< Unknown
620670 ) {
621- os_printf ("ESP8266: jshSPISend16\n" );
622- jshSPISend (device , data >> 8 );
623- jshSPISend (device , data & 255 );
671+ //os_printf("> jshSPISend16 - device=%d, data=%x\n", device, data);
672+ //jshSPISend(device, data >> 8);
673+ //jshSPISend(device, data & 255);
674+ if (device != EV_SPI1 ) {
675+ return ;
676+ }
677+
678+ spi_tx16 (HSPI , data );
679+ //os_printf("< jshSPISend16\n");
624680}
625681
626682
@@ -631,7 +687,8 @@ void jshSPISet16(
631687 IOEventFlags device , //!< Unknown
632688 bool is16 //!< Unknown
633689 ) {
634- os_printf ("ESP8266: jshSPISet16\n" );
690+ os_printf ("> jshSPISet16 - device=%d, is16=%d\n" , device , is16 );
691+ os_printf ("< jshSPISet16\n" );
635692}
636693
637694
@@ -641,11 +698,15 @@ void jshSPISet16(
641698void jshSPIWait (
642699 IOEventFlags device //!< Unknown
643700 ) {
644- os_printf ("ESP8266: jshSPIWait\n" );
701+ os_printf ("> jshSPIWait - device=%d\n" , device );
702+ while (spi_busy (HSPI )) ;
703+ os_printf ("< jshSPIWait\n" );
645704}
646705
647706/** Set whether to use the receive interrupt or not */
648707void jshSPISetReceive (IOEventFlags device , bool isReceive ) {
708+ os_printf ("> jshSPISetReceive - device=%d, isReceive=%d\n" , device , isReceive );
709+ os_printf ("< jshSPISetReceive\n" );
649710}
650711
651712//===== I2C =====
@@ -948,8 +1009,17 @@ void jshUtilTimerReschedule(JsSysTime period) {
9481009//===== Miscellaneous =====
9491010
9501011bool jshIsDeviceInitialised (IOEventFlags device ) {
951- os_printf ("ESP8266: jshIsDeviceInitialised %d\n" , device );
952- return true;
1012+ os_printf ("> jshIsDeviceInitialised - %d\n" , device );
1013+ bool retVal = true;
1014+ switch (device ) {
1015+ case EV_SPI1 :
1016+ retVal = g_spiInitialized ;
1017+ break ;
1018+ default :
1019+ break ;
1020+ }
1021+ os_printf ("< jshIsDeviceInitialised - %d\n" , retVal );
1022+ return retVal ;
9531023} // End of jshIsDeviceInitialised
9541024
9551025// the esp8266 doesn't have any temperature sensor
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