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AP_HAL_AVR: spi transaction handle null RX properly

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This commit is contained in:
Pat Hickey 2012-12-17 17:59:46 -08:00 committed by Andrew Tridgell
parent 992de8c2b9
commit 3153105682
3 changed files with 24 additions and 6 deletions
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10
libraries/AP_HAL_AVR/SPIDevice_SPI0.cpp
View File

@ -72,8 +72,14 @@ inline uint8_t AVRSPI0DeviceDriver::_transfer(uint8_t data) {
void AVRSPI0DeviceDriver::transaction(const uint8_t *tx, uint8_t *rx,
uint16_t len) {
_cs_assert();
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
if (rx == NULL) {
for (uint16_t i = 0; i < len; i++) {
_transfer(tx[i]);
}
} else {
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
}
}
_cs_release();
}

10
libraries/AP_HAL_AVR/SPIDevice_SPI2.cpp
View File

@ -71,8 +71,14 @@ inline uint8_t AVRSPI2DeviceDriver::_transfer(uint8_t data) {
void AVRSPI2DeviceDriver::transaction(const uint8_t *tx, uint8_t *rx,
uint16_t len) {
_cs_assert();
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
if (rx == NULL) {
for (uint16_t i = 0; i < len; i++) {
_transfer(tx[i]);
}
} else {
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
}
}
_cs_release();
}

10
libraries/AP_HAL_AVR/SPIDevice_SPI3.cpp
View File

@ -76,8 +76,14 @@ uint8_t AVRSPI3DeviceDriver::_transfer(uint8_t data) {
void AVRSPI3DeviceDriver::transaction(const uint8_t *tx, uint8_t *rx,
uint16_t len) {
_cs_assert();
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
if (rx == NULL) {
for (uint16_t i = 0; i < len; i++) {
_transfer(tx[i]);
}
} else {
for (uint16_t i = 0; i < len; i++) {
rx[i] = _transfer(tx[i]);
}
}
_cs_release();
}