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Fix AVR SPI parameter configuration, remove timeouts due to sync protocol. (#8775)

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Nick Brassel 2020-04-13 17:09:50 +10:00 • committed by GitHub
parent 157d121c71
commit 46e4493761
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4 changed files with 94 additions and 88 deletions
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131
drivers/avr/spi_master.c
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@ -34,6 +34,10 @@
# define SPI_MISO_PIN B4
#endif
#ifndef SPI_TIMEOUT
# define SPI_TIMEOUT 100
#endif
static pin_t currentSlavePin = NO_PIN;
static uint8_t currentSlaveConfig = 0;
static bool currentSlave2X = false;
@ -47,65 +51,74 @@ void spi_init(void) {
SPCR = (_BV(SPE) | _BV(MSTR));
}
void spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint8_t divisor) {
if (currentSlavePin == NO_PIN && slavePin != NO_PIN) {
if (lsbFirst) {
currentSlaveConfig |= _BV(DORD);
}
switch (mode) {
case 1:
currentSlaveConfig |= _BV(CPHA);
break;
case 2:
currentSlaveConfig |= _BV(CPOL);
break;
case 3:
currentSlaveConfig |= (_BV(CPOL) | _BV(CPHA));
break;
}
uint8_t roundedDivisor = 1;
while (roundedDivisor < divisor) {
roundedDivisor <<= 1;
}
switch (roundedDivisor) {
case 16:
currentSlaveConfig |= _BV(SPR0);
break;
case 64:
currentSlaveConfig |= _BV(SPR1);
break;
case 128:
currentSlaveConfig |= (_BV(SPR1) | _BV(SPR0));
break;
case 2:
currentSlave2X = true;
break;
case 8:
currentSlave2X = true;
currentSlaveConfig |= _BV(SPR0);
break;
case 32:
currentSlave2X = true;
currentSlaveConfig |= _BV(SPR1);
break;
}
SPSR |= currentSlaveConfig;
currentSlavePin = slavePin;
setPinOutput(currentSlavePin);
writePinLow(currentSlavePin);
bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
if (currentSlavePin != NO_PIN || slavePin == NO_PIN) {
return false;
}
currentSlaveConfig = 0;
if (lsbFirst) {
currentSlaveConfig |= _BV(DORD);
}
switch (mode) {
case 1:
currentSlaveConfig |= _BV(CPHA);
break;
case 2:
currentSlaveConfig |= _BV(CPOL);
break;
case 3:
currentSlaveConfig |= (_BV(CPOL) | _BV(CPHA));
break;
}
uint16_t roundedDivisor = 1;
while (roundedDivisor < divisor) {
roundedDivisor <<= 1;
}
switch (roundedDivisor) {
case 16:
currentSlaveConfig |= _BV(SPR0);
break;
case 64:
currentSlaveConfig |= _BV(SPR1);
break;
case 128:
currentSlaveConfig |= (_BV(SPR1) | _BV(SPR0));
break;
case 2:
currentSlave2X = true;
break;
case 8:
currentSlave2X = true;
currentSlaveConfig |= _BV(SPR0);
break;
case 32:
currentSlave2X = true;
currentSlaveConfig |= _BV(SPR1);
break;
}
SPCR |= currentSlaveConfig;
if (currentSlave2X) {
SPSR |= _BV(SPI2X);
}
currentSlavePin = slavePin;
setPinOutput(currentSlavePin);
writePinLow(currentSlavePin);
return true;
}
spi_status_t spi_write(uint8_t data, uint16_t timeout) {
spi_status_t spi_write(uint8_t data) {
SPDR = data;
uint16_t timeout_timer = timer_read();
while (!(SPSR & _BV(SPIF))) {
if ((timeout != SPI_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
return SPI_STATUS_TIMEOUT;
}
}
@ -113,12 +126,12 @@ spi_status_t spi_write(uint8_t data, uint16_t timeout) {
return SPDR;
}
spi_status_t spi_read(uint16_t timeout) {
spi_status_t spi_read() {
SPDR = 0x00; // Dummy
uint16_t timeout_timer = timer_read();
while (!(SPSR & _BV(SPIF))) {
if ((timeout != SPI_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
return SPI_STATUS_TIMEOUT;
}
}
@ -126,21 +139,21 @@ spi_status_t spi_read(uint16_t timeout) {
return SPDR;
}
spi_status_t spi_transmit(const uint8_t *data, uint16_t length, uint16_t timeout) {
spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
spi_status_t status = SPI_STATUS_ERROR;
for (uint16_t i = 0; i < length; i++) {
status = spi_write(data[i], timeout);
status = spi_write(data[i]);
}
return status;
}
spi_status_t spi_receive(uint8_t *data, uint16_t length, uint16_t timeout) {
spi_status_t spi_receive(uint8_t *data, uint16_t length) {
spi_status_t status = SPI_STATUS_ERROR;
for (uint16_t i = 0; i < length; i++) {
status = spi_read(timeout);
status = spi_read();
if (status > 0) {
data[i] = status;
@ -155,9 +168,9 @@ void spi_stop(void) {
setPinOutput(currentSlavePin);
writePinHigh(currentSlavePin);
currentSlavePin = NO_PIN;
SPSR &= ~(_BV(SPI2X));
SPCR &= ~(currentSlaveConfig);
currentSlaveConfig = 0;
SPSR = 0;
currentSlave2X = false;
}
}