From ff5b0ba90e73a83360a2e8a7e9969ed2c3ce1514 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Thu, 21 Jun 2012 09:46:50 -0700 Subject: [PATCH] altos: Crank down STM SPI speed for MM The cc1120 is noisy enough to break SPI data transfers at 4MHz, so crank things down to 1MHz. It's "stable" now, but clearly needs a filter and shorter traces. Signed-off-by: Keith Packard --- src/stm/ao_spi_stm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/stm/ao_spi_stm.c b/src/stm/ao_spi_stm.c index 8784d985..d3378648 100644 --- a/src/stm/ao_spi_stm.c +++ b/src/stm/ao_spi_stm.c @@ -282,7 +282,7 @@ ao_spi_get(uint8_t spi_index) (1 << STM_SPI_CR1_SSI) | /* ... */ (0 << STM_SPI_CR1_LSBFIRST) | /* Big endian */ (1 << STM_SPI_CR1_SPE) | /* Enable SPI unit */ - (STM_SPI_CR1_BR_PCLK_8 << STM_SPI_CR1_BR) | /* baud rate to pclk/4 */ + (STM_SPI_CR1_BR_PCLK_16 << STM_SPI_CR1_BR) | /* baud rate to pclk/4 */ (1 << STM_SPI_CR1_MSTR) | (0 << STM_SPI_CR1_CPOL) | /* Format 0 */ (0 << STM_SPI_CR1_CPHA)); -- 2.30.2