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Write speed tuning
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@ -935,14 +935,16 @@ void readDataLoop(uint32_t blockSize, byte* dstptr)
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register gpio_reg_map *port_b = PBREG;
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register volatile uint32_t *port_a_idr = &(GPIOA->regs->IDR);
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REQ_ON();
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// Start of the do/while and WAIT are already aligned to 8 bytes.
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// Fastest alignment obtained by trial and error.
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// Wait loop is within an 8 byte prefetch buffer.
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asm("nop");
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do {
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WAIT_ACK_ACTIVE();
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uint32_t ret = port_b->IDR;
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REQ_OFF();
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*dstptr++ = ~(ret >> 8);
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// Move wait loop in to a single 8 byte prefetch buffer
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asm("nop.w;nop");
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asm("nop;nop;nop");
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WAIT_ACK_INACTIVE();
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REQ_ON();
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// Extra 1 cycle delay
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