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authorDaniel Friesel <derf@finalrewind.org>2018-07-17 09:48:54 +0200
committerDaniel Friesel <derf@finalrewind.org>2018-07-17 09:48:54 +0200
commit658ca283452c5944c55d9c751868eef6c6f34138 (patch)
tree153eeeeadd3bed45bbc2ba696c1d4075c212f206 /src/arch
parentc8482531fbaeb75aaa58d7273853d0d1b0914713 (diff)
MSP430: Some idle waiting
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/msp430fr5969lp/arch.cc2
-rw-r--r--src/arch/msp430fr5969lp/driver/i2c.cc29
2 files changed, 25 insertions, 6 deletions
diff --git a/src/arch/msp430fr5969lp/arch.cc b/src/arch/msp430fr5969lp/arch.cc
index 3016842..9ea49b7 100644
--- a/src/arch/msp430fr5969lp/arch.cc
+++ b/src/arch/msp430fr5969lp/arch.cc
@@ -79,6 +79,7 @@ void Arch::idle_loop(void)
asm volatile("nop");
__bis_SR_register(LPM2_bits);
asm volatile("nop");
+ __dint();
#if defined(WITH_LOOP)
if (run_loop) {
loop();
@@ -97,6 +98,7 @@ void Arch::idle(void)
asm volatile("nop");
__bis_SR_register(LPM2_bits);
asm volatile("nop");
+ __dint();
#ifdef WITH_WAKEUP
wakeup();
#endif
diff --git a/src/arch/msp430fr5969lp/driver/i2c.cc b/src/arch/msp430fr5969lp/driver/i2c.cc
index 5f1f4c1..fffc28c 100644
--- a/src/arch/msp430fr5969lp/driver/i2c.cc
+++ b/src/arch/msp430fr5969lp/driver/i2c.cc
@@ -1,6 +1,9 @@
#include "driver/i2c.h"
+#include "arch.h"
#include <msp430.h>
+volatile unsigned short old_ifg = 0;
+
signed char I2C::setup()
{
UCB0CTL1 = UCSWRST;
@@ -47,17 +50,25 @@ signed char I2C::xmit(unsigned char 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;
+ UCB0IFG = 0;
+ old_ifg = 0;
+ UCB0IE = UCTXIE0 | UCNACKIE | UCCLTOIE;
+ while (!(old_ifg & (UCTXIFG0 | UCNACKIFG | UCCLTOIFG))) {
+ arch.idle();
+ }
+ UCB0IE = 0;
+ if (old_ifg & (UCNACKIFG | UCCLTOIFG)) {
UCB0CTL1 |= UCTXSTP;
return -1;
}
+ old_ifg = 0;
UCB0TXBUF = tx_buf[i];
}
- while (!(UCB0IFG & (UCTXIFG0 | UCNACKIFG | UCCLTOIFG)));
- UCB0IFG &= ~(UCTXIFG0 | UCNACKIFG);
+ UCB0IE = UCTXIE0 | UCNACKIE | UCCLTOIE;
+ while (!(old_ifg & (UCTXIFG0 | UCNACKIFG | UCCLTOIFG))) {
+ arch.idle();
+ }
+ UCB0IE = 0;
//if (UCB0IFG & (UCNACKIFG | UCCLTOIFG)) {
// UCB0IFG &= ~UCNACKIFG;
// UCB0IFG &= ~UCCLTOIFG;
@@ -90,4 +101,10 @@ signed char I2C::xmit(unsigned char address,
return 0;
}
+__attribute__((interrupt(USCI_B0_VECTOR))) __attribute__((wakeup)) void handle_usci_b0()
+{
+ old_ifg = UCB0IFG;
+ UCB0IFG = 0;
+}
+
I2C i2c;