From 34ec0e23e63aa2bbd4939958eeb2093f9cadd3c2 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <daniel.friesel@uos.de>
Date: Wed, 25 Sep 2019 11:13:23 +0200
Subject: Fix MSP430FR5994 I2C driver

---
 src/arch/msp430fr5994lp/driver/i2c.cc | 92 +++++++++++++++++------------------
 1 file changed, 46 insertions(+), 46 deletions(-)

(limited to 'src/arch')

diff --git a/src/arch/msp430fr5994lp/driver/i2c.cc b/src/arch/msp430fr5994lp/driver/i2c.cc
index fe5b37b..57b4c30 100644
--- a/src/arch/msp430fr5994lp/driver/i2c.cc
+++ b/src/arch/msp430fr5994lp/driver/i2c.cc
@@ -10,43 +10,43 @@ volatile unsigned short old_ifg = 0;
 
 #if (F_CPU / F_I2C) < 45
 inline void await_i2c_int(unsigned int ie_flags, unsigned int ifg_flags) {
-	while (!(UCB0IFG & ifg_flags)) ;
-	if (UCB0IFG & (UCNACKIFG | UCCLTOIFG)) {
-		UCB0IFG &= ~(UCNACKIFG | UCCLTOIFG);
+	while (!(UCB1IFG & ifg_flags)) ;
+	if (UCB1IFG & (UCNACKIFG | UCCLTOIFG)) {
+		UCB1IFG &= ~(UCNACKIFG | UCCLTOIFG);
 	}
 }
 #else
 inline void await_i2c_int(unsigned int ie_flags, unsigned int ifg_flags)
 {
-	UCB0IFG = 0;
+	UCB1IFG = 0;
 	old_ifg = 0;
-	UCB0IE = ie_flags;
+	UCB1IE = ie_flags;
 	do {
 		arch.idle();
 	} while (!(old_ifg & ifg_flags));
-	UCB0IE = 0;
+	UCB1IE = 0;
 }
 #endif
 
 signed char I2C::setup()
 {
 #ifdef I2C_PULLUP_FIXED_GPIO
-	P1DIR |= BIT4 | BIT5;
-	P1OUT |= BIT4 | BIT5;
+	P8DIR |= BIT2 | BIT3;
+	P8OUT |= BIT2 | BIT3;
 #endif
-	UCB0CTL1 = UCSWRST;
-	UCB0CTLW0 = UCMODE_3 | UCMST | UCSYNC | UCSSEL_2 | UCSWRST | UCCLTO_1;
-	UCB0BRW = (F_CPU / F_I2C) - 1;
-	P1DIR &= ~(BIT6 | BIT7);
-	P1SEL0 &= ~(BIT6 | BIT7);
-	P1SEL1 |= BIT6 | BIT7;
+	UCB1CTL1 = UCSWRST;
+	UCB1CTLW0 = UCMODE_3 | UCMST | UCSYNC | UCSSEL_2 | UCSWRST | UCCLTO_1;
+	UCB1BRW = (F_CPU / F_I2C) - 1;
+	P5DIR &= ~(BIT0 | BIT1);
+	P5SEL0 |= (BIT0 | BIT1);
+	P5SEL1 &= ~(BIT0 | BIT1);
 
-	UCB0CTL1 &= ~UCSWRST;
-	UCB0I2CSA = 0;
+	UCB1CTL1 &= ~UCSWRST;
+	UCB1I2CSA = 0;
 
 	arch.delay_us(100);
 
-	if (UCB0STAT & UCBBUSY)
+	if (UCB1STAT & UCBBUSY)
 		return -1;
 
 	return 0;
@@ -55,18 +55,18 @@ signed char I2C::setup()
 void I2C::scan(unsigned int *results)
 {
 	for (unsigned char address = 0; address < 128; address++) {
-		UCB0I2CSA = address;
-		UCB0CTL1 |= UCTR | UCTXSTT | UCTXSTP;
+		UCB1I2CSA = address;
+		UCB1CTL1 |= UCTR | UCTXSTT | UCTXSTP;
 
-		while (UCB0CTL1 & UCTXSTP);
+		while (UCB1CTL1 & UCTXSTP);
 
-		if (UCB0IFG & UCNACKIFG) {
-			UCB0IFG &= ~UCNACKIFG;
+		if (UCB1IFG & UCNACKIFG) {
+			UCB1IFG &= ~UCNACKIFG;
 		} else {
 			results[address / (8 * sizeof(unsigned int))] |= 1 << (address % (8 * sizeof(unsigned int)));
 		}
 	}
-	UCB0IFG = 0;
+	UCB1IFG = 0;
 }
 
 signed char I2C::xmit(unsigned char address,
@@ -74,55 +74,55 @@ signed char I2C::xmit(unsigned char address,
 		unsigned char rx_len, unsigned char *rx_buf)
 {
 	unsigned char i;
-	UCB0I2CSA = address;
+	UCB1I2CSA = address;
 	if (tx_len) {
-		UCB0CTL1 |= UCTR | UCTXSTT;
+		UCB1CTL1 |= UCTR | UCTXSTT;
 		for (i = 0; i < tx_len; i++) {
 			await_i2c_int(UCTXIE0 | UCNACKIE | UCCLTOIE, UCTXIFG0 | UCNACKIFG | UCCLTOIFG);
 			if (old_ifg & (UCNACKIFG | UCCLTOIFG)) {
-				UCB0CTL1 |= UCTXSTP;
+				UCB1CTL1 |= UCTXSTP;
 				return -1;
 			}
 			old_ifg = 0;
-			UCB0TXBUF = tx_buf[i];
+			UCB1TXBUF = tx_buf[i];
 		}
 		await_i2c_int(UCTXIE0 | UCNACKIE | UCCLTOIE, UCTXIFG0 | UCNACKIFG | UCCLTOIFG);
-		//if (UCB0IFG & (UCNACKIFG | UCCLTOIFG)) {
-		//	UCB0IFG &= ~UCNACKIFG;
-		//	UCB0IFG &= ~UCCLTOIFG;
-		//	UCB0CTL1 |= UCTXSTP;
+		//if (UCB1IFG & (UCNACKIFG | UCCLTOIFG)) {
+		//	UCB1IFG &= ~UCNACKIFG;
+		//	UCB1IFG &= ~UCCLTOIFG;
+		//	UCB1CTL1 |= UCTXSTP;
 		//	return -1;
 		//}
 	}
 	if (rx_len) {
-		UCB0I2CSA = address;
-		UCB0IFG = 0;
-		UCB0CTL1 &= ~UCTR;
-		UCB0CTL1 |= UCTXSTT;
+		UCB1I2CSA = address;
+		UCB1IFG = 0;
+		UCB1CTL1 &= ~UCTR;
+		UCB1CTL1 |= UCTXSTT;
 
-		while (UCB0CTL1 & UCTXSTT);
-		UCB0IFG &= ~UCTXIFG0;
+		while (UCB1CTL1 & UCTXSTT);
+		UCB1IFG &= ~UCTXIFG0;
 
 		for (i = 0; i < rx_len; i++) {
 			if (i == rx_len - 1)
-				UCB0CTL1 |= UCTXSTP;
+				UCB1CTL1 |= UCTXSTP;
 			await_i2c_int(UCRXIE | UCNACKIE | UCCLTOIE, UCRXIFG0 | UCNACKIFG | UCCLTOIFG);
-			rx_buf[i] = UCB0RXBUF;
-			UCB0IFG &= ~UCRXIFG0;
+			rx_buf[i] = UCB1RXBUF;
+			UCB1IFG &= ~UCRXIFG0;
 		}
-		UCB0IFG &= ~UCRXIFG0;
+		UCB1IFG &= ~UCRXIFG0;
 	}
 
-	UCB0CTL1 |= UCTXSTP;
+	UCB1CTL1 |= UCTXSTP;
 
-	while (UCB0CTL1 & UCTXSTP);
+	while (UCB1CTL1 & UCTXSTP);
 	return 0;
 }
 
-__attribute__((interrupt(USCI_B0_VECTOR))) __attribute__((wakeup)) void handle_usci_b0()
+__attribute__((interrupt(USCI_B1_VECTOR))) __attribute__((wakeup)) void handle_usci_b1()
 {
-	old_ifg = UCB0IFG;
-	UCB0IFG = 0;
+	old_ifg = UCB1IFG;
+	UCB1IFG = 0;
 }
 
 I2C i2c;
-- 
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