diff options
Diffstat (limited to 'apps/spi-test/app.c')
-rw-r--r-- | apps/spi-test/app.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/apps/spi-test/app.c b/apps/spi-test/app.c new file mode 100644 index 00000000..6ddd2782 --- /dev/null +++ b/apps/spi-test/app.c @@ -0,0 +1,71 @@ +#include <stdio.h> +#include <string.h> +#include <peripheral_clk_config.h> +#include "watch.h" + +// NOTE: as of this writing (10/25/21) there is no SPI controller functionality in the watch library. +// this is a very basic app to confirm that SPI is working, tested with board OSO-MISC-21-001 and a GD25Q16C Flash chip. +// The updated SPI Flash sensor board design is OSO-MISC-21-017 (it's easier to build, 0603 passives instead of 0402's). + +struct io_descriptor *io; +struct spi_m_sync_descriptor SPI_0; + +void app_init(void) { + // SPI_0_CLOCK_init + hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_CORE, CONF_GCLK_SERCOM3_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos)); + hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_SLOW, CONF_GCLK_SERCOM3_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos)); + hri_mclk_set_APBCMASK_SERCOM3_bit(MCLK); + + spi_m_sync_init(&SPI_0, SERCOM3); + + // SPI_0_PORT_init + gpio_set_pin_level(A3, true); + gpio_set_pin_direction(A3, GPIO_DIRECTION_OUT); + gpio_set_pin_function(A3, GPIO_PIN_FUNCTION_OFF); + + gpio_set_pin_level(A2, false); + gpio_set_pin_direction(A2, GPIO_DIRECTION_OUT); + gpio_set_pin_function(A2, PINMUX_PB02C_SERCOM3_PAD0); + + gpio_set_pin_direction(A4, GPIO_DIRECTION_IN); + gpio_set_pin_pull_mode(A4, GPIO_PULL_OFF); + gpio_set_pin_function(A4, PINMUX_PB00C_SERCOM3_PAD2); + + gpio_set_pin_level(A1, false); + gpio_set_pin_direction(A1, GPIO_DIRECTION_OUT); + gpio_set_pin_function(A1, PINMUX_PB01C_SERCOM3_PAD3); + + spi_m_sync_get_io_descriptor(&SPI_0, &io); + spi_m_sync_enable(&SPI_0); +} + +void app_wake_from_backup(void) { +} + +void app_setup(void) { +} + +void app_prepare_for_standby(void) { +} + +void app_wake_from_standby(void) { +} + +static uint8_t get_id_command[4] = {0x9F}; + +bool app_loop(void) { + watch_set_pin_level(A3, false); + io_write(io, get_id_command, 1); + uint8_t buf[3] = {0}; + + // should print 0, 0, 0 + printf("blank: %x, %x, %x\n", buf[0], buf[1], buf[2]); + io_read(io, buf, 3); + watch_set_pin_level(A3, true); + // should print c8, 40, 15 + printf("ident: %x, %x, %x\n", buf[0], buf[1], buf[2]); + + delay_ms(100); + + return false; +} |