diff options
| author | Luke T. Shumaker <lukeshu@lukeshu.com> | 2025-03-04 00:05:35 -0700 |
|---|---|---|
| committer | Luke T. Shumaker <lukeshu@lukeshu.com> | 2025-03-04 00:05:35 -0700 |
| commit | fb73355711c99003c559df48164a1ce6db93cff9 (patch) | |
| tree | a3aab6adf34f12a9df12be2b92e6d489d3667f47 /libhw/rp2040_include | |
| parent | 95d821dc2767a4b144dba30977dab35825594e06 (diff) | |
libhw: rp2040_hwspi: Add more config knobs
Diffstat (limited to 'libhw/rp2040_include')
| -rw-r--r-- | libhw/rp2040_include/libhw/rp2040_hwspi.h | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/libhw/rp2040_include/libhw/rp2040_hwspi.h b/libhw/rp2040_include/libhw/rp2040_hwspi.h index a1d85d4..fef1dbd 100644 --- a/libhw/rp2040_include/libhw/rp2040_hwspi.h +++ b/libhw/rp2040_include/libhw/rp2040_hwspi.h @@ -20,9 +20,14 @@ enum rp2040_hwspi_instance { struct rp2040_hwspi { BEGIN_PRIVATE(LIBHW_RP2040_HWSPI_H) + /* const */ LM_IF(IS_IMPLEMENTATION_FOR(LIBHW_RP2040_HWSPI_H))(spi_inst_t)(void) *inst; + uint64_t min_delay_ns; + uint8_t bogus_data; + uint pin_cs; - uint pin_cs; + /* mutable */ + uint64_t dead_until_ns; END_PRIVATE(LIBHW_RP2040_HWSPI_H) }; LO_IMPLEMENTATION_H(io_duplex_readwriter, struct rp2040_hwspi, rp2040_hwspi) @@ -31,14 +36,17 @@ LO_IMPLEMENTATION_H(spi, struct rp2040_hwspi, rp2040_hwspi) /** * Initialize an instance of `struct rp2040_hwspi`. * - * @param self : struct rp2040_hwspi : the structure to initialize - * @param name : char * : a name for the SPI port; to include in the bininfo - * @param inst_num : enum rp2040_hwspi_instance : the PL220 instance number; RP2040_HWSPI_{0,1} - * @param mode : enum spi_mode : the SPI mode; SPI_MODE_{0..3} - * @param pin_miso : uint : pin number; 0, 4, 16, or 20 for _HWSPI_0; 8, 12, 24, or 28 for _HWSPI_1 - * @param pin_mosi : uint : pin number; 3, 7, 19, or 23 for _HWSPI_0; 11, 15, or 27 for _HWSPI_1 - * @param pin_clk : uint : pin number; 2, 6, 18, or 22 for _HWSPI_0; 10, 14, or 26 for _HWSPI_1 - * @param pin_cs : uint : pin number; any unused GPIO pin + * @param self : struct rp2040_hwspi : the structure to initialize + * @param name : char * : a name for the SPI port; to include in the bininfo + * @param inst_num : enum rp2040_hwspi_instance : the PL220 instance number; RP2040_HWSPI_{0,1} + * @param mode : enum spi_mode : the SPI mode; SPI_MODE_{0..3} + * @param baudrate_hz : uint : baudrate in Hz + * @param min_delay_ns: uint64_t : minimum time for pin_cs to be high between messages + * @param bogus_data : uint8_t : bogus data to write when .iov_write_src is NULL + * @param pin_miso : uint : pin number; 0, 4, 16, or 20 for _HWSPI_0; 8, 12, 24, or 28 for _HWSPI_1 + * @param pin_mosi : uint : pin number; 3, 7, 19, or 23 for _HWSPI_0; 11, 15, or 27 for _HWSPI_1 + * @param pin_clk : uint : pin number; 2, 6, 18, or 22 for _HWSPI_0; 10, 14, or 26 for _HWSPI_1 + * @param pin_cs : uint : pin number; any unused GPIO pin * * There is no bit-order argument; the RP2040's hardware SPI always * uses MSB-first bit order. @@ -67,6 +75,7 @@ LO_IMPLEMENTATION_H(spi, struct rp2040_hwspi, rp2040_hwspi) */ #define rp2040_hwspi_init(self, name, \ inst_num, mode, baudrate_hz, \ + min_delay_ns, bogus_data, \ pin_miso, pin_mosi, pin_clk, pin_cs) \ do { \ bi_decl(bi_4pins_with_names(pin_miso, name" SPI MISO", \ @@ -75,12 +84,15 @@ LO_IMPLEMENTATION_H(spi, struct rp2040_hwspi, rp2040_hwspi) pin_mosi, name" SPI CS")); \ _rp2040_hwspi_init(self, \ inst_num, mode, baudrate_hz, \ + min_delay_ns, bogus_data, \ pin_miso, pin_mosi, pin_clk, pin_cs); \ } while(0) void _rp2040_hwspi_init(struct rp2040_hwspi *self, enum rp2040_hwspi_instance inst_num, enum spi_mode mode, uint baudrate_hz, + uint64_t min_delay_ns, + uint8_t bogus_data, uint pin_miso, uint pin_mosi, uint pin_clk, |