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SPI Updates #1

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SPI Updates #1

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0e54ad3
SPI Updates
JSchaenzle Oct 9, 2018
e6bb53a
Added another example file that uses SPI1
JSchaenzle Oct 9, 2018
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16 changes: 10 additions & 6 deletions firmware/Adafruit_SSD1306_mfGFX.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -129,21 +129,24 @@ Adafruit_SSD1306::Adafruit_SSD1306(int8_t SID, int8_t SCLK, int8_t DC, int8_t RS
sclk = SCLK;
sid = SID;
hwSPI = false;
spiClass = NULL;
}

// constructor for hardware SPI - we indicate DataCommand, ChipSelect, Reset
Adafruit_SSD1306::Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS) : Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
Adafruit_SSD1306::Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS, bool USE_SPI1) : Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
dc = DC;
rst = RST;
cs = CS;
hwSPI = true;
spiClass = USE_SPI1 ? &SPI1 : &SPI;
}

// initializer for I2C - we only indicate the reset pin!
Adafruit_SSD1306::Adafruit_SSD1306(int8_t reset) :
Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
sclk = dc = cs = sid = -1;
rst = reset;
spiClass = NULL;
}


Expand All @@ -162,10 +165,11 @@ void Adafruit_SSD1306::begin(uint8_t vccstate, uint8_t i2caddr) {
}
if (hwSPI){
digitalWrite(cs, HIGH);
SPI.setBitOrder(MSBFIRST);
SPI.setClockDivider(SPI_CLOCK_DIV8); // 72MHz / 8 = 9Mhz
SPI.setDataMode(0);
SPI.begin();
spiClass->.setBitOrder(MSBFIRST);
spiClass->.setClockDivider(SPI_CLOCK_DIV8); // 72MHz / 8 = 9Mhz
spiClass->.setDataMode(0);
spiClass->.begin(cs); // Passing the chip-select here just sets the pin mode.
// The peripheral won't automatically assert/deassert the pin during operation.
}
}
else
Expand Down Expand Up @@ -451,7 +455,7 @@ void Adafruit_SSD1306::clearDisplay(void) {
inline void Adafruit_SSD1306::fastSPIwrite(uint8_t d) {

if(hwSPI) {
(void)SPI.transfer(d);
(void)spiClass->transfer(d);
} else {
shiftOut(sid, sclk, MSBFIRST, d); // SSD1306 specs show MSB out first
}
Expand Down
3 changes: 2 additions & 1 deletion firmware/Adafruit_SSD1306_mfGFX.h
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ All text above, and the splash screen must be included in any redistribution
class Adafruit_SSD1306 : public Adafruit_GFX {
public:
Adafruit_SSD1306(int8_t SID, int8_t SCLK, int8_t DC, int8_t RST, int8_t CS);
Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS);
Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS, bool USE_SPI1=false);
Adafruit_SSD1306(int8_t RST);

void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC, uint8_t i2caddr = SSD1306_I2C_ADDRESS);
Expand All @@ -135,6 +135,7 @@ class Adafruit_SSD1306 : public Adafruit_GFX {

private:
int8_t _i2caddr, _vccstate, sid, sclk, dc, rst, cs;
SPIClass * spiClass;
void fastSPIwrite(uint8_t c);

boolean hwSPI;
Expand Down
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