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SPI: Ensure all read-only data pointers are marked as const (#3356)

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This changes all SPI functions that take data pointers which are
not modified so that the declaration is const. This allows them
to be used with const data (i.e. held in flash). No functional
changes are required.

The defnitions of spiWrite() and spiTransferBytes()  in
esp-hal-spi.h/c have been updated to be consistent.

Tests:
 - Build a simple sketch using SPI.writePattern() and
   SPI.transferBytes()  which uses const data and verify that the
   attached device functions as expected.
This commit is contained in:
David J. Fiddes
2019-10-14 18:39:27 +01:00
committed by Me No Dev
parent 611ba8ea8a
commit b847f41e24
4 changed files with 16 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
cores/esp32/esp32-hal-spi.c
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@ -459,7 +459,7 @@ void spiWaitReady(spi_t * spi)
while(spi->dev->cmd.usr);
}
void spiWrite(spi_t * spi, uint32_t *data, uint8_t len)
void spiWrite(spi_t * spi, const uint32_t *data, uint8_t len)
{
if(!spi) {
return;
@ -671,7 +671,7 @@ void __spiTransferBytes(spi_t * spi, uint8_t * data, uint8_t * out, uint32_t byt
}
}
void spiTransferBytes(spi_t * spi, uint8_t * data, uint8_t * out, uint32_t size)
void spiTransferBytes(spi_t * spi, const uint8_t * data, uint8_t * out, uint32_t size)
{
if(!spi) {
return;
@ -861,7 +861,7 @@ uint32_t spiTransferLongNL(spi_t * spi, uint32_t data)
return data;
}
void spiWriteNL(spi_t * spi, const void * data_in, size_t len){
void spiWriteNL(spi_t * spi, const void * data_in, uint32_t len){
size_t longs = len >> 2;
if(len & 3){
longs++;
@ -887,7 +887,7 @@ void spiWriteNL(spi_t * spi, const void * data_in, size_t len){
}
}
void spiTransferBytesNL(spi_t * spi, const void * data_in, uint8_t * data_out, size_t len){
void spiTransferBytesNL(spi_t * spi, const void * data_in, uint8_t * data_out, uint32_t len){
if(!spi) {
return;
}
@ -974,7 +974,7 @@ void spiTransferBitsNL(spi_t * spi, uint32_t data, uint32_t * out, uint8_t bits)
}
}
void IRAM_ATTR spiWritePixelsNL(spi_t * spi, const void * data_in, size_t len){
void IRAM_ATTR spiWritePixelsNL(spi_t * spi, const void * data_in, uint32_t len){
size_t longs = len >> 2;
if(len & 3){
longs++;