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Inline ASM for I2C port inputs now marked volatile to avoid compiler touching them

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This commit is contained in:
Ross Owen
2014-10-31 15:16:07 +00:00
parent 876e5a2606
commit 30f610d185
1 changed files with 3 additions and 3 deletions
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6
module_usb_audio/audio.xc
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@@ -603,7 +603,7 @@ chanend ?c_adc)
{ {
// p_i2s_adc[index++] :> sample; // p_i2s_adc[index++] :> sample;
// Manual IN instruction since compiler generates an extra setc per IN (bug #15256) // Manual IN instruction since compiler generates an extra setc per IN (bug #15256)
asm("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++])); asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
#if NUM_USB_CHAN_IN > 0 #if NUM_USB_CHAN_IN > 0
samplesIn[i] = bitrev(sample); samplesIn[i] = bitrev(sample);
@@ -666,7 +666,7 @@ chanend ?c_adc)
{ {
// p_i2s_adc[index++] :> sample; // p_i2s_adc[index++] :> sample;
// Manual IN instruction since compiler generates an extra setc per IN (bug #15256) // Manual IN instruction since compiler generates an extra setc per IN (bug #15256)
asm("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++])); asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
#if NUM_USB_CHAN_IN > 0 #if NUM_USB_CHAN_IN > 0
samplesInPrev[i] = bitrev(sample); samplesInPrev[i] = bitrev(sample);
@@ -679,7 +679,7 @@ chanend ?c_adc)
x = inuint(c_adc); x = inuint(c_adc);
inct(c_adc); inct(c_adc);
asm("stw %0, dp[g_adcVal]"::"r"(x)); asm volatile("stw %0, dp[g_adcVal]"::"r"(x));
} }
#endif #endif
#endif #endif