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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-27 18:49:32 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-27 18:49:32 +0000 |
commit | a7bfa13bc1055fa88761d8536e2d754bd7f932e2 (patch) | |
tree | 2692620b5876158fc578dc6186112f95248d8689 /nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c | |
parent | d7575bbc74cfcd8def8ae616a123d2fe4335527f (diff) | |
download | px4-nuttx-a7bfa13bc1055fa88761d8536e2d754bd7f932e2.tar.gz px4-nuttx-a7bfa13bc1055fa88761d8536e2d754bd7f932e2.tar.bz2 px4-nuttx-a7bfa13bc1055fa88761d8536e2d754bd7f932e2.zip |
Fleshing out CGU driver
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2439 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c')
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c b/nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c new file mode 100755 index 000000000..040edd51c --- /dev/null +++ b/nuttx/arch/arm/src/lpc313x/lpc313x_esrndx.c @@ -0,0 +1,134 @@ +/************************************************************************ + * arch/arm/src/lpc313x/lpc313x_esrndx.c + * + * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * References: + * - UM10314 LPC3130/31 User manual Rev. 1.01 — 9 September 2009 + * - lpc313x.cdl.drivers.zip example driver code + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************************/ + +/************************************************************************ + * Included Files + ************************************************************************/ + +#include <nuttx/config.h> +#include <stdint.h> + +#include "up_arch.h" +#include "lpc313x_cgudrvr.h" + +/************************************************************************ + * Pre-processor Definitions + ************************************************************************/ + +/************************************************************************ + * Private Data + ************************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: lp313x_esrndx + * + * Description: + * Given a clock ID, return the index of the corresponding ESR + * register (or ESRNDX_INVALID if there is no ESR associated with + * this clock ID). Indexing of ESRs differs slightly from the clock + * ID: There are 92 clock IDs but only 89 ESR regisers. There are no + * ESR registers for : + * + * + * CLKID_I2SRXBCK0 Clock ID 87: I2SRX_BCK0 + * CLKID_I2SRXBCK1, Clock ID 88: I2SRX_BCK1 + * + * and + * + * CLKID_SYSCLKO Clock ID 91: SYSCLK_O + * + ************************************************************************/ + +int lp313x_esrndx(enum lpc313x_clockid_e clkid) +{ + int esrndx = (int)clkid; + + /* There ar 89 Enable Select Registers (ESR). Indexing for these + * registers is identical to indexing to other registers (like PCR), + * except that there are no ESR registers for + * + * + * CLKID_I2SRXBCK0 Clock ID 87: I2SRX_BCK0 + * CLKID_I2SRXBCK1, Clock ID 88: I2SRX_BCK1 + * + * and + * + * CLKID_SYSCLKO Clock ID 91: SYSCLK_O + */ + + switch (clkid) + { + /* There are no ESR registers corresponding to the following + * three clocks: + */ + + case CLKID_I2SRXBCK0: + case CLKID_I2SRXBCK1: + case CLKID_SYSCLKO: + esrndx = ESRNDX_INVALID; + break; + + /* These clock IDs are a special case and need to be adjusted + * by two: + * + * CLKID_SPICLK Clock ID 89, ESR index 87 + * CLKID_SPICLKGATED Clock ID 90, ESR index 88 + */ + + case CLKID_SPICLK: + case CLKID_SPICLKGATED: + esrndx = esrndx - 2; + break; + + /* The rest of the indices match up and we don't have to do anything. */ + + default: + break; + } + + return esrndx; +} |