Support optional SoftI2C pullups on MSP430

2 files changed, 8 insertions, 1 deletions

diff --git a/src/arch/msp430fr5969lp/arch.cc b/src/arch/msp430fr5969lp/arch.cc
index 9ea49b7..ddb84a4 100644
--- a/src/arch/msp430fr5969lp/arch.cc
+++ b/src/arch/msp430fr5969lp/arch.cc
@@ -72,6 +72,13 @@ extern void loop();
 volatile char run_loop = 0;
 #endif
 
+void Arch::delay_us(unsigned char const us)
+{
+	for (int i = 0; i < us/10; i++) {
+		__delay_cycles(160);
+	}
+}
+
 void Arch::idle_loop(void)
 {
 	while (1) {
diff --git a/src/arch/msp430fr5969lp/driver/i2c.cc b/src/arch/msp430fr5969lp/driver/i2c.cc
index fffc28c..55f8591 100644
--- a/src/arch/msp430fr5969lp/driver/i2c.cc
+++ b/src/arch/msp430fr5969lp/driver/i2c.cc
@@ -16,7 +16,7 @@ signed char I2C::setup()
 	UCB0CTL1 &= ~UCSWRST;
 	UCB0I2CSA = 0;
 
-	__delay_cycles(1600);
+	arch.delay_us(100);
 
 	if (UCB0STAT & UCBBUSY)
 		return -1;