Power optimization - Improve SPI sleep mode

Ensure that all pins are set to their default configuration during sleep mode.
Disable the workaround for FTPAN58 (SPI freezes when transfering a single byte) at the end of the transfer. This disables the resources needed for the workaround.
Those changes reduce the power usage by 430-490µA.
This commit is contained in:
Jean-François Milants 2023-05-07 18:24:34 +02:00 committed by JF
parent 2fa3aaa161
commit 4c0f897953
4 changed files with 11 additions and 1 deletions

View file

@ -27,7 +27,8 @@ bool Spi::WriteCmdAndBuffer(const uint8_t* cmd, size_t cmdSize, const uint8_t* d
}
bool Spi::Init() {
nrf_gpio_pin_set(pinCsn); /* disable Set slave select (inactive high) */
nrf_gpio_cfg_output(pinCsn);
nrf_gpio_pin_set(pinCsn);
return true;
}

View file

@ -204,6 +204,9 @@ bool SpiMaster::Write(uint8_t pinCsn, const uint8_t* data, size_t size) {
;
nrf_gpio_pin_set(this->pinCsn);
currentBufferAddr = 0;
DisableWorkaroundForFtpan58(spiBaseAddress, 0, 0);
xSemaphoreGive(mutex);
}

View file

@ -10,6 +10,7 @@ SpiNorFlash::SpiNorFlash(Spi& spi) : spi {spi} {
}
void SpiNorFlash::Init() {
spi.Init();
device_id = ReadIdentificaion();
NRF_LOG_INFO("[SpiNorFlash] Manufacturer : %d, Memory type : %d, memory density : %d",
device_id.manufacturer,
@ -23,10 +24,12 @@ void SpiNorFlash::Uninit() {
void SpiNorFlash::Sleep() {
auto cmd = static_cast<uint8_t>(Commands::DeepPowerDown);
spi.Write(&cmd, sizeof(uint8_t));
spi.Sleep();
NRF_LOG_INFO("[SpiNorFlash] Sleep")
}
void SpiNorFlash::Wakeup() {
spi.Wakeup();
// send Commands::ReleaseFromDeepPowerDown then 3 dummy bytes before reading Device ID
static constexpr uint8_t cmdSize = 4;
uint8_t cmd[cmdSize] = {static_cast<uint8_t>(Commands::ReleaseFromDeepPowerDown), 0x01, 0x02, 0x03};

View file

@ -187,10 +187,13 @@ void St7789::HardwareReset() {
void St7789::Sleep() {
SleepIn();
nrf_gpio_cfg_default(pinDataCommand);
nrf_gpio_cfg_default(26);
spi.Sleep();
NRF_LOG_INFO("[LCD] Sleep");
}
void St7789::Wakeup() {
spi.Wakeup();
nrf_gpio_cfg_output(pinDataCommand);
SleepOut();
VerticalScrollStartAddress(verticalScrollingStartAddress);