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Diffstat (limited to 'cpu/at91rm9200/at45.c')
-rw-r--r--cpu/at91rm9200/at45.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/cpu/at91rm9200/at45.c b/cpu/at91rm9200/at45.c
index 9dfe560..3c00132 100644
--- a/cpu/at91rm9200/at45.c
+++ b/cpu/at91rm9200/at45.c
@@ -25,7 +25,14 @@
#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
-#define SPI_CLK 5000000
+#define AT91C_SPI_CLK 10000000 /* Max Value = 10MHz to be compliant to
+the Continuous Array Read function */
+
+/* AC Characteristics */
+/* DLYBS = tCSS = 250ns min and DLYBCT = tCSH = 250ns */
+#define DATAFLASH_TCSS (0xC << 16)
+#define DATAFLASH_TCHS (0x1 << 24)
+
#define AT91C_TIMEOUT_WRDY 200000
#define AT91C_SPI_PCS0_SERIAL_DATAFLASH 0xE /* Chip Select 0 : NPCS0 %1110 */
#define AT91C_SPI_PCS3_DATAFLASH_CARD 0x7 /* Chip Select 3 : NPCS3 %0111 */
@@ -50,9 +57,11 @@ void AT91F_SpiInit(void) {
AT91C_BASE_SPI->SPI_MR = AT91C_SPI_MSTR | AT91C_SPI_MODFDIS | AT91C_SPI_PCS;
/* Configure CS0 and CS3 */
- *(AT91C_SPI_CSR + 0) = AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & 0x100000) | ((AT91C_MASTER_CLOCK / (2*SPI_CLK)) << 8);
+ *(AT91C_SPI_CSR + 0) = AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & DATAFLASH_TCSS) | (AT91C_SPI_DLYBCT &
+ DATAFLASH_TCHS) | ((AT91C_MASTER_CLOCK / (2*AT91C_SPI_CLK)) << 8);
- *(AT91C_SPI_CSR + 3) = AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & 0x100000) | ((AT91C_MASTER_CLOCK / (2*SPI_CLK)) << 8);
+ *(AT91C_SPI_CSR + 3) = AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & DATAFLASH_TCSS) | (AT91C_SPI_DLYBCT &
+ DATAFLASH_TCHS) | ((AT91C_MASTER_CLOCK / (2*AT91C_SPI_CLK)) << 8);
}