88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
#include <hal/nrf_gpio.h>
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#include "SpiMaster.h"
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using namespace Pinetime::Drivers;
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bool SpiMaster::Init(const SpiMaster::SpiModule spi, const SpiMaster::Parameters ¶ms) {
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/* Configure GPIO pins used for pselsck, pselmosi, pselmiso and pselss for SPI0 */
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nrf_gpio_cfg_output(params.pinSCK);
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nrf_gpio_cfg_output(params.pinMOSI);
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nrf_gpio_cfg_input(params.pinMISO, NRF_GPIO_PIN_NOPULL);
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nrf_gpio_cfg_output(params.pinCSN);
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pinCsn = params.pinCSN;
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switch(spi) {
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case SpiModule::SPI0: spiBaseAddress = NRF_SPI0; break;
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case SpiModule::SPI1: spiBaseAddress = NRF_SPI1; break;
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default: return false;
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}
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/* Configure pins, frequency and mode */
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spiBaseAddress->PSELSCK = params.pinSCK;
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spiBaseAddress->PSELMOSI = params.pinMOSI;
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spiBaseAddress->PSELMISO = params.pinMISO;
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nrf_gpio_pin_set(pinCsn); /* disable Set slave select (inactive high) */
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uint32_t frequency;
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switch(params.Frequency) {
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case Frequencies::Freq8Mhz: frequency = 0x80000000; break;
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default: return false;
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}
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spiBaseAddress->FREQUENCY = frequency;
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uint32_t regConfig = 0;
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switch(params.bitOrder) {
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case BitOrder::Msb_Lsb: break;
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case BitOrder::Lsb_Msb: regConfig = 1;
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default: return false;
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}
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switch(params.mode) {
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case Modes::Mode0: break;
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case Modes::Mode1: regConfig |= (0x01 << 1); break;
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case Modes::Mode2: regConfig |= (0x02 << 1); break;
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case Modes::Mode3: regConfig |= (0x03 << 1); break;
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default: return false;
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}
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spiBaseAddress->CONFIG = regConfig;
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spiBaseAddress->EVENTS_READY = 0;
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spiBaseAddress->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);
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return true;
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}
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bool SpiMaster::Write(const uint8_t *data, size_t size) {
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volatile uint32_t dummyread;
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if(data == nullptr) return false;
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/* enable slave (slave select active low) */
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nrf_gpio_pin_clear(pinCsn);
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spiBaseAddress->EVENTS_READY = 0;
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spiBaseAddress->TXD = (uint32_t)*data++;
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while(--size)
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{
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spiBaseAddress->TXD = (uint32_t)*data++;
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/* Wait for the transaction complete or timeout (about 10ms - 20 ms) */
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while (spiBaseAddress->EVENTS_READY == 0);
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/* clear the event to be ready to receive next messages */
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spiBaseAddress->EVENTS_READY = 0;
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dummyread = spiBaseAddress->RXD;
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}
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/* Wait for the transaction complete or timeout (about 10ms - 20 ms) */
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while (spiBaseAddress->EVENTS_READY == 0);
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dummyread = spiBaseAddress->RXD;
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/* disable slave (slave select active low) */
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nrf_gpio_pin_set(pinCsn);
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return true;
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}
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