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‎spi.c-use

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/* 2016-08-14 (C) Jonas S Karlsson, [email protected] */
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// TODO: use
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// #include "esp/spi.h"
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> void spi_led(int, int, int, int, int);
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>
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> PRIM led_show(lisp init, lisp digit, lisp val, lisp decode, lisp delay) {
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> spi_led(getint(init), getint(digit), getint(val), getint(decode), getint(delay));
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>
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> return mkint(1);
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> }
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>
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> int spiData[] = { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
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>
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unsigned char decodeMode = 1;
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PRIM led_data(lisp data, lisp offset) {
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int pos = getint(offset);
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int i = 0;
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int val = 0;
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while (data && ((i + pos) < 15)) {
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val = getint(car(data));
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// show nums and hex
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if (decodeMode == 0) {
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if (val > 9 && val < 16) {
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// offset by space ascii and start of lowercase alphabet
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val = val + 32 + 65 - 10;
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} else if (val >= 0 && val < 10) {
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val = val + 32 + 65 - 49;
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}
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}
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spiData[pos + i] = val;
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i = i + 1;
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data = cdr(data);
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}
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return nil;
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}
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DEFPRIM (delay, 1, delay);
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DEFPRIM (led_data, 2, led_data);
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DEFPRIM (led_show, 5, led_show);
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DEFPRIM(delay, 1, delay);
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DEFPRIM(load, -3, load); // -3 to get env?
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DEFPRIM(dir, 1, dir);
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DEFPRIM(cat, 1, cat);
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// hardware spi pins
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int cs_pin = 12 ;
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int clk_pin = 14;
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int data_pin = 13;
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#define MAXREG_DECODEMODE 0x09
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#define MAXREG_INTENSITY 0x0A
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#define MAXREG_SCANLIMIT 0x0B
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#define MAXREG_SHUTDOWN 0x0C
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#define MAXREG_DISPTEST 0x0F
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void shiftOut(unsigned char* data, int delay);
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unsigned char sendChar(const char data, const bool dp);
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void spi_led(int init, int digit, int val, int decode, int delay) {
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gpio_enable(cs_pin, GPIO_OUTPUT);
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gpio_enable(clk_pin, GPIO_OUTPUT);
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gpio_enable(data_pin, GPIO_OUTPUT);
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// bool bSpi = spi_init(0, 2, 4, true, SPI_BIG_ENDIAN, true);
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// bool bSpi = spi_init(1, 0, 4, true, SPI_BIG_ENDIAN, true);
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// const spi_settings_t my_settings = {
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// .mode = SPI_MODE0,
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// .freq_divider = SPI_FREQ_DIV_4M,
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// .msb = true,
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// .endianness = SPI_LITTLE_ENDIAN,
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// .minimal_pins = true
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// };
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// spi_settings_t old;
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// spi_get_settings(1, &old); // save current settings
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// printf("mode %d ", old.mode);
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// printf("dvd %d ", old.freq_divider);
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// printf("msb %d ", old.msb);
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// printf("end %d ", old.endianness);
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// printf("min %d ", old.minimal_pins);
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// useful comments in this code re cpol, cpha
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//https://github.com/MetalPhreak/ESP8266_SPI_Driver/blob/master/driver/spi.c
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// settings from spi.h, look reasonable
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// spi_init(1, SPI_MODE0, SPI_FREQ_DIV_10M, true, SPI_LITTLE_ENDIAN, false ); //true);
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// send two bytes, d15 first
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// see pdf p6 for format
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// Table 1. Serial-Data Format (16 Bits)
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// D15 D14
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// X
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// D13 D12
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// X X
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// D11 D10 D9 D8
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// ADDRESS
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// D7 D6 D5 D4
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// X
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// D3 D2 D1 D0
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// MSB DATA LSB
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unsigned char bytes[2];
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unsigned char initC = (unsigned char)init;
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if (init > 0) {
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if (initC & 0x04) {
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bytes[0] = MAXREG_SHUTDOWN;
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bytes[1] = 0x01;
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shiftOut(bytes, delay);
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}
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if (initC & 0x01) {
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bytes[0] = MAXREG_SCANLIMIT;
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bytes[1] = 0x07;
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shiftOut(bytes, delay);
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}
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if (initC & 0x02) {
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bytes[0] = MAXREG_DECODEMODE;
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if (decode > 0) {
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bytes[1] = 0xFF;
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decodeMode = 1;
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} else {
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bytes[1] = 0x0;
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decodeMode = 0;
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}
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shiftOut(bytes, delay);
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}
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if (initC & 0x08) {
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bytes[0] = MAXREG_DISPTEST;
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bytes[1] = 0x00;
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shiftOut(bytes, delay);
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}
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if (initC & 0x10) {
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bytes[0] = MAXREG_INTENSITY;
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bytes[1] = (unsigned char)val;
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shiftOut(bytes, delay);
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}
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if (initC & 0x20) {
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for (unsigned char i = 0; i < 8; i++) {
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bytes[0] = i + 1;
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bytes[1] = 0;
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shiftOut(bytes, delay);
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}
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}
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}
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for (unsigned char i = 0; i < digit; i++) {
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bytes[0] = 8-i; // i+ 1;
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if (decodeMode == 1) {
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bytes[1] = spiData[i];
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} else {
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bytes[1] = sendChar(spiData[i], false);
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}
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shiftOut(bytes, delay);
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}
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// spi_set_settings(1, &old); // restore saved settings
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}
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// uint16_t retVal = spi_transfer_16(1, info);
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//
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// printf("rv %d ", retVal);
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//
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// return;
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void send2Byte(unsigned char reg, unsigned char data) {
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uint16_t info = reg*256+data;
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char i = 16;
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do {
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gpio_write(clk_pin, 0);
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if (info & 0x8000) {
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gpio_write(data_pin, 1);
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} else {
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gpio_write(data_pin, 0);
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}
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gpio_write(clk_pin, 1);
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info <<= 1;
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} while(--i);
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}
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// check this page
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// http://www.instructables.com/id/MAX7219-8-Digit-LED-Display-Module-Driver-for-ESP8/step4/MAX7219-Driver-Implementation/
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// also
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// https://github.com/wayoda/LedControl/blob/master/src/LedControl.cpp
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void shiftOut(unsigned char* data, int delay) {
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gpio_write(cs_pin, 0);
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send2Byte(data[0], data[1]);
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gpio_write(cs_pin, 1);
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vTaskDelay(delay);
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return;
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}
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unsigned char sendChar(const char data, const bool dp) {
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unsigned char converted = 0b0000001; // hyphen as default
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// look up bit pattern if possible
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if (data >= ' ' && data <= 'z')
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converted = MAX7219_font[data - ' '];
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// 'or' in the decimal point if required
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if (dp)
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converted |= 0b10000000;
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return converted;
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}

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