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path: root/drivers/sensors/cirque_pinnacle_spi.c
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Diffstat (limited to 'drivers/sensors/cirque_pinnacle_spi.c')
-rw-r--r--drivers/sensors/cirque_pinnacle_spi.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/sensors/cirque_pinnacle_spi.c b/drivers/sensors/cirque_pinnacle_spi.c
index e00e73eb8c..34c77df07b 100644
--- a/drivers/sensors/cirque_pinnacle_spi.c
+++ b/drivers/sensors/cirque_pinnacle_spi.c
@@ -7,6 +7,7 @@
// Masks for Cirque Register Access Protocol (RAP)
#define WRITE_MASK 0x80
#define READ_MASK 0xA0
+#define FILLER_BYTE 0xFC
extern bool touchpad_init;
@@ -16,11 +17,11 @@ void RAP_ReadBytes(uint8_t address, uint8_t* data, uint8_t count) {
uint8_t cmdByte = READ_MASK | address; // Form the READ command byte
if (touchpad_init) {
if (spi_start(CIRQUE_PINNACLE_SPI_CS_PIN, CIRQUE_PINNACLE_SPI_LSBFIRST, CIRQUE_PINNACLE_SPI_MODE, CIRQUE_PINNACLE_SPI_DIVISOR)) {
- spi_write(cmdByte);
- spi_read(); // filler
- spi_read(); // filler
+ spi_write(cmdByte); // write command byte, receive filler
+ spi_write(FILLER_BYTE); // write & receive filler
+ spi_write(FILLER_BYTE); // write & receive filler
for (uint8_t i = 0; i < count; i++) {
- data[i] = spi_read(); // each sepsequent read gets another register's contents
+ data[i] = spi_write(FILLER_BYTE); // write filler, receive data on the third filler send
}
} else {
#ifdef CONSOLE_ENABLE