diff options
| author | Daniel Friesel <derf@finalrewind.org> | 2018-10-25 15:01:23 +0200 |
|---|---|---|
| committer | Daniel Friesel <derf@finalrewind.org> | 2018-10-25 15:01:23 +0200 |
| commit | 61ff5bbb4cae80997562bcd4edd5c35a4f801b44 (patch) | |
| tree | 49e9d1d0615949d2c6d9b9d804ea8bbe56168723 /src | |
| parent | 3e884d678b5bd2871452bdfb81be3d9ea4fa4431 (diff) | |
softi2c: Work around MSP430 timing issues with softi2c_timer=1
Diffstat (limited to 'src')
| -rw-r--r-- | src/driver/soft_i2c.cc | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/driver/soft_i2c.cc b/src/driver/soft_i2c.cc index e16c4a1..de634b1 100644 --- a/src/driver/soft_i2c.cc +++ b/src/driver/soft_i2c.cc @@ -176,6 +176,15 @@ signed char SoftI2C::xmit(unsigned char address, volatile unsigned char timer_done = 0; +/* + * Note: On MSP430, if F_CPU / F_I2C < 60 (approx.), await_timer() does not + * work. Probably related to missed interrupts / not enough cycles between + * start and idle? We work around this for now by simulating an immediate + * return in these cases. + */ +#if MULTIPASS_ARCH_msp430fr5969lp && ((F_CPU / F_I2C) < 60) +inline void await_timer() {} +#else inline void await_timer() { timer_done = 0; @@ -185,6 +194,7 @@ inline void await_timer() } timer.stop(); } +#endif signed char SoftI2C::setup() { |