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Pull in programmer board firmware

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Matt Mets 2023-03-08 13:46:59 +01:00 • committed by Michael Cardell Widerkrantz
parent 2cd7c9f8e3
commit 9c7022edd0
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14 changed files with 1344 additions and 351 deletions
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68
hw/boards/tp1/firmware/src/pio_spi.c Normal file
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/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "pio_spi.h"
// Just 8 bit functions provided here. The PIO program supports any frame size
// 1...32, but the software to do the necessary FIFO shuffling is left as an
// exercise for the reader :)
//
// Likewise we only provide MSB-first here. To do LSB-first, you need to
// - Do shifts when reading from the FIFO, for general case n != 8, 16, 32
// - Do a narrow read at a one halfword or 3 byte offset for n == 16, 8
// in order to get the read data correctly justified.
void __time_critical_func(pio_spi_write8_blocking)(const pio_spi_inst_t *spi, const uint8_t *src, size_t len) {
size_t tx_remain = len, rx_remain = len;
// Do 8 bit accesses on FIFO, so that write data is byte-replicated. This
// gets us the left-justification for free (for MSB-first shift-out)
io_rw_8 *txfifo = (io_rw_8 *) &spi->pio->txf[spi->sm];
io_rw_8 *rxfifo = (io_rw_8 *) &spi->pio->rxf[spi->sm];
while (tx_remain || rx_remain) {
if (tx_remain && !pio_sm_is_tx_fifo_full(spi->pio, spi->sm)) {
*txfifo = *src++;
--tx_remain;
}
if (rx_remain && !pio_sm_is_rx_fifo_empty(spi->pio, spi->sm)) {
(void) *rxfifo;
--rx_remain;
}
}
}
void __time_critical_func(pio_spi_read8_blocking)(const pio_spi_inst_t *spi, uint8_t *dst, size_t len) {
size_t tx_remain = len, rx_remain = len;
io_rw_8 *txfifo = (io_rw_8 *) &spi->pio->txf[spi->sm];
io_rw_8 *rxfifo = (io_rw_8 *) &spi->pio->rxf[spi->sm];
while (tx_remain || rx_remain) {
if (tx_remain && !pio_sm_is_tx_fifo_full(spi->pio, spi->sm)) {
*txfifo = 0;
--tx_remain;
}
if (rx_remain && !pio_sm_is_rx_fifo_empty(spi->pio, spi->sm)) {
*dst++ = *rxfifo;
--rx_remain;
}
}
}
void __time_critical_func(pio_spi_write8_read8_blocking)(const pio_spi_inst_t *spi, const uint8_t *src, uint8_t *dst,
size_t len) {
size_t tx_remain = len, rx_remain = len;
io_rw_8 *txfifo = (io_rw_8 *) &spi->pio->txf[spi->sm];
io_rw_8 *rxfifo = (io_rw_8 *) &spi->pio->rxf[spi->sm];
while (tx_remain || rx_remain) {
if (tx_remain && !pio_sm_is_tx_fifo_full(spi->pio, spi->sm)) {
*txfifo = *src++;
--tx_remain;
}
if (rx_remain && !pio_sm_is_rx_fifo_empty(spi->pio, spi->sm)) {
*dst++ = *rxfifo;
--rx_remain;
}
}
}