diff options
Diffstat (limited to 'src/atsamd/spi.c')
| -rw-r--r-- | src/atsamd/spi.c | 43 |
1 files changed, 20 insertions, 23 deletions
diff --git a/src/atsamd/spi.c b/src/atsamd/spi.c index 2037f312..4bf281bc 100644 --- a/src/atsamd/spi.c +++ b/src/atsamd/spi.c @@ -1,5 +1,6 @@ // spi support on samd // +// Copyright (C) 2019 Florian Heilmann <Florian.Heilmann@gmx.net> // Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net> // // This file may be distributed under the terms of the GNU GPLv3 license. @@ -9,24 +10,14 @@ #include "gpio.h" // spi_setup #include "sched.h" // sched_shutdown -static void -spi_init(uint32_t ctrla, uint32_t baud) +void +spi_init(uint32_t bus, SercomSpi *ss, uint32_t ctrla, uint32_t baud) { - static int have_run_init; - if (have_run_init) + static int have_run_init[8]; + if (have_run_init[bus]) return; - have_run_init = 1; - - // Setup clock - enable_pclock(SERCOM4_GCLK_ID_CORE, ID_SERCOM4); - - // Configure MISO, MOSI, SCK pins - gpio_peripheral(GPIO('A', 12), 'D', 0); - gpio_peripheral(GPIO('B', 10), 'D', 0); - gpio_peripheral(GPIO('B', 11), 'D', 0); + have_run_init[bus] = 1; - // Configure spi - SercomSpi *ss = &SERCOM4->SPI; ss->CTRLA.reg = 0; ss->CTRLA.reg = ctrla & ~SERCOM_SPI_CTRLA_ENABLE; ss->CTRLB.reg = SERCOM_SPI_CTRLB_RXEN; @@ -37,24 +28,30 @@ spi_init(uint32_t ctrla, uint32_t baud) struct spi_config spi_setup(uint32_t bus, uint8_t mode, uint32_t rate) { - if (bus) +#ifdef SERCOM7 + if (bus > 7) +#else + if (bus > 5) +#endif shutdown("Invalid spi bus"); + uint32_t dipo_dopo = sercom_spi_pins(bus); uint32_t ctrla = (SERCOM_SPI_CTRLA_MODE(3) | (mode << SERCOM_SPI_CTRLA_CPHA_Pos) - | SERCOM_SPI_CTRLA_DIPO(0) - | SERCOM_SPI_CTRLA_DOPO(1) + | dipo_dopo | SERCOM_SPI_CTRLA_ENABLE); - uint32_t baud = get_pclock_frequency(SERCOM4_GCLK_ID_CORE) / (2 * rate) - 1; - spi_init(ctrla, baud); - return (struct spi_config){ .ctrla = ctrla, .baud = baud }; + Sercom *sercom = sercom_enable_pclock(bus); + SercomSpi *ss = &sercom->SPI; + uint32_t baud = sercom_get_pclock_frequency(bus) / (2 * rate) - 1; + spi_init(bus, ss, ctrla, baud); + return (struct spi_config){ .ss = ss, .ctrla = ctrla, .baud = baud }; } void spi_prepare(struct spi_config config) { uint32_t ctrla = config.ctrla, baud = config.baud; - SercomSpi *ss = &SERCOM4->SPI; + SercomSpi *ss = (SercomSpi *)config.ss; if (ctrla == ss->CTRLA.reg && baud == ss->BAUD.reg) return; ss->CTRLA.reg = ctrla & ~SERCOM_SPI_CTRLA_ENABLE; @@ -67,7 +64,7 @@ void spi_transfer(struct spi_config config, uint8_t receive_data , uint8_t len, uint8_t *data) { - SercomSpi *ss = &SERCOM4->SPI; + SercomSpi *ss = (SercomSpi *)config.ss; if (receive_data) { while (len--) { ss->DATA.reg = *data; |