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Add DREQ methods for PWM/SPI/UART/I2C (#603)

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Graham Sanderson
2021-10-12 16:04:16 -05:00
committed by GitHub
parent 2f2e62968d
commit f808b5f2dc
5 changed files with 62 additions and 2 deletions
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9
src/rp2_common/hardware_pio/include/hardware/pio.h
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@ -436,14 +436,19 @@ static inline void pio_gpio_init(PIO pio, uint pin) {
gpio_set_function(pin, pio == pio0 ? GPIO_FUNC_PIO0 : GPIO_FUNC_PIO1);
}
/*! \brief Return the DREQ to use for pacing transfers to a particular state machine
/*! \brief Return the DREQ to use for pacing transfers to/from a particular state machine FIFO
* \ingroup hardware_pio
*
* \param pio The PIO instance; either \ref pio0 or \ref pio1
* \param sm State machine index (0..3)
* \param is_tx true for sending data to the state machine, false for received data from the state machine
* \param is_tx true for sending data to the state machine, false for receiving data from the state machine
*/
static inline uint pio_get_dreq(PIO pio, uint sm, bool is_tx) {
static_assert(DREQ_PIO0_TX1 == DREQ_PIO0_TX0 + 1, "");
static_assert(DREQ_PIO0_TX2 == DREQ_PIO0_TX0 + 2, "");
static_assert(DREQ_PIO0_TX3 == DREQ_PIO0_TX0 + 3, "");
static_assert(DREQ_PIO0_RX0 == DREQ_PIO0_TX0 + NUM_PIO_STATE_MACHINES, "");
static_assert(DREQ_PIO1_RX0 == DREQ_PIO1_TX0 + NUM_PIO_STATE_MACHINES, "");
check_pio_param(pio);
check_sm_param(sm);
return sm + (is_tx ? 0 : NUM_PIO_STATE_MACHINES) + (pio == pio0 ? DREQ_PIO0_TX0 : DREQ_PIO1_TX0);