diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c')
| -rw-r--r-- | c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c b/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c index 60526d4fe0..8dfdc58cfc 100644 --- a/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c +++ b/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c @@ -7,12 +7,13 @@ */ /* - * Copyright (c) 2010 - * embedded brains GmbH - * Obere Lagerstr. 30 - * D-82178 Puchheim - * Germany - * <rtems@embedded-brains.de> + * Copyright (c) 2010-2011 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Obere Lagerstr. 30 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at @@ -51,31 +52,28 @@ rtems_status_code lpc32xx_i2c_init( return lpc32xx_i2c_clock(i2c, clock_in_hz); } -#if LPC32XX_HCLK != 104000000U - #error "unexpected HCLK" -#endif - rtems_status_code lpc32xx_i2c_clock( volatile lpc32xx_i2c *i2c, unsigned clock_in_hz ) { + uint32_t clk_div = lpc32xx_hclk() / clock_in_hz; uint32_t clk_lo = 0; uint32_t clk_hi = 0; switch (clock_in_hz) { case 100000: - clk_lo = 520; - clk_hi = 520; + clk_lo = clk_div / 2; break; case 400000: - clk_lo = 166; - clk_hi = 94; + clk_lo = (64 * clk_div) / 100; break; default: return RTEMS_INVALID_CLOCK; } + clk_hi = clk_div - clk_lo; + i2c->clk_lo = clk_lo; i2c->clk_hi = clk_hi; |