nrf: Return immediatly from mp_hal_delay_us if 0us is given
After nrfx 1.0.0 a new macro was introduced to do a common hardware timeout. The macro function triggers a counter of retries or a timeout in us. However, in many cases, like in nrfx_adc.c the timeout value is set to 0, leading to a infinite loop in mp_hal_delay_us. This patch prevents this from happening. Path of error: nrfx_adc.c -> NRFX_WAIT_FOR -> NRFX_DELAY_US -> mp_hal_delay_us.
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@ -82,6 +82,10 @@ void mp_hal_stdout_tx_str(const char *str) {
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void mp_hal_delay_us(mp_uint_t us)
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{
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if (us == 0) {
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return;
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}
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register uint32_t delay __ASM ("r0") = us;
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__ASM volatile (
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#ifdef NRF51
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