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cpu/sam0_common: SPI: allow to only configure MOSI/CLK

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Some slave devices (e.g. LED strips) don't have a back-channel and
will only need MOSI and CLK.
This commit is contained in:
Benjamin Valentin 2021-01-21 17:51:51 +01:00
parent 67e5a37495
commit 00a467e86d
1 changed files with 10 additions and 4 deletions
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14
cpu/sam0_common/periph/spi.c
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@ -350,11 +350,15 @@ void spi_init(spi_t bus)
void spi_init_pins(spi_t bus)
{
/* MISO must always have PD/PU, see #5968. This is a ~65uA difference */
gpio_init(spi_config[bus].miso_pin, GPIO_IN_PD);
if (gpio_is_valid(spi_config[bus].miso_pin)) {
gpio_init(spi_config[bus].miso_pin, GPIO_IN_PD);
gpio_init_mux(spi_config[bus].miso_pin, spi_config[bus].miso_mux);
}
gpio_init(spi_config[bus].mosi_pin, GPIO_OUT);
gpio_init(spi_config[bus].clk_pin, GPIO_OUT);
gpio_init_mux(spi_config[bus].miso_pin, spi_config[bus].miso_mux);
gpio_init_mux(spi_config[bus].mosi_pin, spi_config[bus].mosi_mux);
gpio_init(spi_config[bus].clk_pin, GPIO_OUT);
/* clk_pin will be muxed during acquire / release */
mutex_unlock(&locks[bus]);
@ -364,7 +368,9 @@ void spi_deinit_pins(spi_t bus)
{
mutex_lock(&locks[bus]);
gpio_disable_mux(spi_config[bus].miso_pin);
if (gpio_is_valid(spi_config[bus].miso_pin)) {
gpio_disable_mux(spi_config[bus].miso_pin);
}
gpio_disable_mux(spi_config[bus].mosi_pin);
}