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add some notes to the SPI functions (aligned to 32Bit)

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- Fatal exception (9)
This commit is contained in:
Markus Sattler 2015-05-13 19:03:21 +02:00
parent b959e82165
commit e0c1b47937
1 changed files with 24 additions and 0 deletions
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24
libraries/SPI/SPI.cpp
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@ -308,6 +308,13 @@ void SPIClass::write32(uint32_t data, bool msb) {
while(SPI1CMD & SPIBUSY) {}
}
/**
* Note:
* data need to be aligned to 32Bit
* or you get an Fatal exception (9)
* @param data uint8_t *
* @param size uint32_t
*/
void SPIClass::writeBytes(uint8_t * data, uint32_t size) {
while(size) {
if(size > 64) {
@ -340,6 +347,15 @@ void SPIClass::writeBytes_(uint8_t * data, uint8_t size) {
while(SPI1CMD & SPIBUSY) {}
}
/**
* Note:
* data need to be aligned to 32Bit
* or you get an Fatal exception (9)
* @param data uint8_t *
* @param size uint8_t max for size is 64Byte
* @param repeat uint32_t
*/
void SPIClass::writePattern(uint8_t * data, uint8_t size, uint32_t repeat) {
if(size > 64) return; //max Hardware FIFO
@ -376,6 +392,14 @@ void SPIClass::writePattern_(uint8_t * data, uint8_t size, uint8_t repeat) {
writeBytes(&buffer[0], bytes);
}
/**
* Note:
* in and out need to be aligned to 32Bit
* or you get an Fatal exception (9)
* @param out uint8_t *
* @param in uint8_t *
* @param size uint32_t
*/
void SPIClass::transferBytes(uint8_t * out, uint8_t * in, uint32_t size) {
while(size) {
if(size > 64) {