Add I2C and LM75 drivers

Makefile

@@ -6,6 +6,7 @@ CFLAGS = -std=c99
 CXXFLAGS = -std=c++14
 
 TARGETS = src/app/${app}/main.cc src/os/object/cpp_helpers.cc src/os/object/outputstream.cc
+TARGETS += src/driver/lm75.cc
 
 ifeq (${timer_cycles}, 1)
 	COMMON_FLAGS += -DTIMER_CYCLES

include/driver/lm75.h

+#ifndef LM75_H
+#define LM75_H
+
+class LM75 {
+	private:
+		LM75(const LM75 &copy);
+		unsigned char const address;
+		unsigned char txbuf[3];
+		unsigned char rxbuf[2];
+
+	public:
+		LM75(unsigned char const addr) : address(addr) {}
+
+		float getTemp();
+		void setOS(unsigned char os);
+		void setHyst(unsigned char hyst);
+};
+
+extern LM75 lm75;
+
+#endif

include/msp430fr5969lp/driver/i2c.h

+#ifndef I2C_H
+#define I2C_H
+
+class I2C {
+	private:
+		I2C(const I2C &copy);
+
+	public:
+		I2C () {}
+		signed char setup();
+		void scan(unsigned int *results);
+		signed char xmit(unsigned char address,
+				unsigned char tx_len, unsigned char *tx_buf,
+				unsigned char rx_len, unsigned char *rx_buf);
+};
+
+extern I2C i2c;
+
+#endif

include/object/outputstream.h

@@ -38,6 +38,8 @@ class OutputStream {
 	OutputStream & operator<<(OutputStream & (*fun) (OutputStream &));
 
 	void setBase(uint8_t b);
+	void printf_uint8(uint8_t num);
+	void printf_float(float num);
 };
 
 

src/arch/msp430fr5969lp/Makefile.inc

@@ -10,8 +10,11 @@ CC = /opt/msp430/ti/gcc/bin/msp430-elf-gcc
 CXX = /opt/msp430/ti/gcc/bin/msp430-elf-g++
 OBJCOPY = /opt/msp430/ti/gcc/bin/msp430-elf-objcopy
 
-TARGETS += src/arch/msp430fr5969lp/arch.cc src/arch/msp430fr5969lp/driver/gpio.cc
-TARGETS += src/arch/msp430fr5969lp/driver/stdout.cc src/arch/msp430fr5969lp/driver/uptime.cc
+TARGETS += src/arch/msp430fr5969lp/arch.cc
+TARGETS += src/arch/msp430fr5969lp/driver/gpio.cc
+TARGETS += src/arch/msp430fr5969lp/driver/stdout.cc
+TARGETS += src/arch/msp430fr5969lp/driver/uptime.cc
+TARGETS += src/arch/msp430fr5969lp/driver/i2c.cc
 
 OBJECTS = ${TARGETS:.cc=.o}
 

src/arch/msp430fr5969lp/driver/i2c.cc

+#include "driver/i2c.h"
+#include <msp430.h>
+
+signed char I2C::setup()
+{
+	UCB0CTL1 = UCSWRST;
+	UCB0CTLW0 = UCMODE_3 | UCMST | UCSYNC | UCSSEL_2 | UCSWRST | UCCLTO_1;
+	UCB0BRW = 0xf00;
+	P1DIR &= ~(BIT6 | BIT7);
+	P1SEL0 &= ~(BIT6 | BIT7);
+	P1SEL1 |= BIT6 | BIT7;
+
+	UCB0CTL1 &= ~UCSWRST;
+	UCB0I2CSA = 0;
+
+	__delay_cycles(1600);
+
+	if (UCB0STAT & UCBBUSY)
+		return -1;
+
+	return 0;
+}
+
+void I2C::scan(unsigned int *results)
+{
+	for (unsigned char address = 0; address < 128; address++) {
+		UCB0I2CSA = address;
+		UCB0CTL1 |= UCTR | UCTXSTT | UCTXSTP;
+
+		while (UCB0CTL1 & UCTXSTP);
+
+		if (UCB0IFG & UCNACKIFG) {
+			UCB0IFG &= ~UCNACKIFG;
+		} else {
+			results[address / (8 * sizeof(unsigned int))] |= 1 << (address % (8 * sizeof(unsigned int)));
+		}
+	}
+	UCB0IFG = 0;
+}
+
+signed char I2C::xmit(unsigned char address,
+		unsigned char tx_len, unsigned char *tx_buf,
+		unsigned char rx_len, unsigned char *rx_buf)
+{
+	unsigned char i;
+	UCB0I2CSA = address;
+	if (tx_len) {
+		UCB0CTL1 |= UCTR | UCTXSTT;
+		for (i = 0; i < tx_len; i++) {
+			while (!(UCB0IFG & (UCTXIFG0 | UCNACKIFG | UCCLTOIFG)));
+			if (UCB0IFG & (UCNACKIFG | UCCLTOIFG)) {
+				UCB0IFG &= ~UCNACKIFG;
+				UCB0IFG &= ~UCCLTOIFG;
+				UCB0CTL1 |= UCTXSTP;
+				return -1;
+			}
+			UCB0TXBUF = tx_buf[i];
+		}
+		while (!(UCB0IFG & (UCTXIFG0 | UCNACKIFG | UCCLTOIFG)));
+		//if (UCB0IFG & (UCNACKIFG | UCCLTOIFG)) {
+		//	UCB0IFG &= ~UCNACKIFG;
+		//	UCB0IFG &= ~UCCLTOIFG;
+		//	UCB0CTL1 |= UCTXSTP;
+		//	return -1;
+		//}
+	}
+	if (rx_len) {
+		UCB0I2CSA = address;
+		UCB0IFG = 0;
+		UCB0CTL1 &= ~UCTR;
+		UCB0CTL1 |= UCTXSTT;
+
+		while (UCB0CTL1 & UCTXSTT);
+		UCB0IFG &= ~UCTXIFG0;
+
+		for (i = 0; i < rx_len; i++) {
+			if (i == rx_len - 1)
+				UCB0CTL1 |= UCTXSTP;
+			while (!(UCB0IFG & (UCRXIFG0 | UCNACKIFG | UCCLTOIFG)));
+			rx_buf[i] = UCB0RXBUF;
+			UCB0IFG &= ~UCRXIFG0;
+		}
+		UCB0IFG &= ~UCRXIFG0;
+	}
+
+	UCB0CTL1 |= UCTXSTP;
+
+	while (UCB0CTL1 & UCTXSTP);
+	return 0;
+}
+
+I2C i2c;

src/driver/lm75.cc

+#include "driver/lm75.h"
+#include "driver/i2c.h"
+
+float LM75::getTemp()
+{
+	txbuf[0] = 0;
+	rxbuf[0] = 0;
+	rxbuf[1] = 0;
+	i2c.xmit(address, 1, txbuf, 2, rxbuf);
+
+	return rxbuf[0] + (rxbuf[1] / 256.0);
+}
+
+void LM75::setOS(unsigned char os)
+{
+	txbuf[0] = 0x03;
+	txbuf[1] = os;
+	txbuf[2] = 0;
+	i2c.xmit(address, 3, txbuf, 0, rxbuf);
+}
+
+void LM75::setHyst(unsigned char hyst)
+{
+	txbuf[0] = 0x02;
+	txbuf[1] = hyst;
+	txbuf[2] = 0;
+	i2c.xmit(address, 3, txbuf, 0, rxbuf);
+}
+
+LM75 lm75(0x48);

src/os/object/outputstream.cc

@@ -2,7 +2,7 @@
 
 OutputStream & OutputStream::operator<<(unsigned char c)
 {
-	put(c);
+	*this << (unsigned long long)c;
 	return *this;
 }
 
@@ -134,6 +134,41 @@ void OutputStream::setBase(uint8_t b)
 	}
 }
 
+static inline char format_hex_nibble(uint8_t num)
+{
+	if (num > 9) {
+		return 'a' + num - 10;
+	}
+	return '0' + num;
+}
+
+void OutputStream::printf_uint8(uint8_t num)
+{
+	put(format_hex_nibble(num / 16));
+	put(format_hex_nibble(num % 16));
+}
+
+void OutputStream::printf_float(float num)
+{
+	if (num < 0) {
+		put('-');
+		num *= -1;
+	}
+	if (num > 1000) {
+		put('0' + (((int)num % 10000) / 1000));
+	}
+	if (num > 100) {
+		put('0' + (((int)num % 1000) / 100));
+	}
+	if (num > 10) {
+		put('0' + (((int)num % 100) / 10));
+	}
+	put('0' + ((int)num % 10));
+	put('.');
+	put('0' + ((int)(num * 10) % 10));
+	put('0' + ((int)(num * 100) % 10));
+}
+
 // FLUSH
 OutputStream & flush(OutputStream & os)
 {